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428
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1 /* Generic stream implementation.
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2 Copyright (C) 1995 Free Software Foundation, Inc.
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3 Copyright (C) 1995 Sun Microsystems, Inc.
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4 Copyright (C) 1996 Ben Wing.
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5
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6 This file is part of XEmacs.
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7
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8 XEmacs is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 2, or (at your option) any
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11 later version.
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12
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13 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with XEmacs; see the file COPYING. If not, write to
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20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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21 Boston, MA 02111-1307, USA. */
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22
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23 /* Synched up with: Not in FSF. */
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24
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25 /* Written by Ben Wing. */
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26
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27 #include <config.h>
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28 #include "lisp.h"
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29
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30 #include "buffer.h"
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31 #include "insdel.h"
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32 #include "lstream.h"
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33
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34 #include "sysfile.h"
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35 #include <errno.h>
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36
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37 /* This function provides a generic buffering stream implementation.
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38 Conceptually, you send data to the stream or read data from the
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39 stream, not caring what's on the other end of the stream. The
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40 other end could be another stream, a file descriptor, a stdio
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41 stream, a fixed block of memory, a reallocating block of memory,
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42 etc. The main purpose of the stream is to provide a standard
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43 interface and to do buffering. Macros are defined to read
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44 or write characters, so the calling functions do not have to
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45 worry about blocking data together in order to achieve efficiency.
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46 */
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47
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48 /* Note that this object is called "stream" in Lisp but "lstream"
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49 in C. The reason for this is that "stream" is too generic a name
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50 for C; too much likelihood of conflict/confusion with C++, etc. */
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51
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52 /* Functions are as follows:
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53
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442
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54 Lstream *Lstream_new (Lstream_implementation *imp, const char *mode)
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428
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55 Allocate and return a new Lstream. This function is not
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56 really meant to be called directly; rather, each stream type
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57 should provide its own stream creation function, which
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58 creates the stream and does any other necessary creation
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59 stuff (e.g. opening a file).
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60
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61 void Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering,
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62 int buffering_size)
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63 Change the buffering of a stream. See lstream.h. By default
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64 the buffering is STREAM_BLOCK_BUFFERED.
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65
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66 int Lstream_flush (Lstream *lstr)
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67 Flush out any pending unwritten data in the stream. Clear
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68 any buffered input data. Returns 0 on success, -1 on error.
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69
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70 int Lstream_putc (Lstream *stream, int c)
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71 Write out one byte to the stream. This is a macro and so
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72 it is very efficient. The C argument is only evaluated once
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73 but the STREAM argument is evaluated more than once. Returns
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74 0 on success, -1 on error.
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75
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76 int Lstream_getc (Lstream *stream)
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77 Read one byte from the stream. This is a macro and so it
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78 is very efficient. The STREAM argument is evaluated more
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79 than once. Return value is -1 for EOF or error.
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80
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81 void Lstream_ungetc (Lstream *stream, int c)
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82 Push one byte back onto the input queue. This will be the
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83 next byte read from the stream. Any number of bytes can be
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84 pushed back and will be read in the reverse order they were
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85 pushed back -- most recent first. (This is necessary for
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86 consistency -- if there are a number of bytes that have been
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87 unread and I read and unread a byte, it needs to be the first
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88 to be read again.) This is a macro and so it is very
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89 efficient. The C argument is only evaluated once but the
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90 STREAM argument is evaluated more than once.
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91
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92 int Lstream_fputc (Lstream *stream, int c)
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93 int Lstream_fgetc (Lstream *stream)
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94 void Lstream_fungetc (Lstream *stream, int c)
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95 Function equivalents of the above macros.
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96
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97 ssize_t Lstream_read (Lstream *stream, void *data, size_t size)
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98 Read SIZE bytes of DATA from the stream. Return the number of
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99 bytes read. 0 means EOF. -1 means an error occurred and no
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100 bytes were read.
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101
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102 ssize_t Lstream_write (Lstream *stream, void *data, size_t size)
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103 Write SIZE bytes of DATA to the stream. Return the number of
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104 bytes written. -1 means an error occurred and no bytes were
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105 written.
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106
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107 void Lstream_unread (Lstream *stream, void *data, size_t size)
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108 Push back SIZE bytes of DATA onto the input queue. The
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109 next call to Lstream_read() with the same size will read the
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110 same bytes back. Note that this will be the case even if
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111 there is other pending unread data.
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112
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113 int Lstream_delete (Lstream *stream)
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114 Frees all memory associated with the stream is freed. Calling
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115 this is not strictly necessary, but it is much more efficient
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116 than having the Lstream be garbage-collected.
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117
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118 int Lstream_close (Lstream *stream)
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119 Close the stream. All data will be flushed out.
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120
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121 void Lstream_reopen (Lstream *stream)
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122 Reopen a closed stream. This enables I/O on it again.
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123 This is not meant to be called except from a wrapper routine
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124 that reinitializes variables and such -- the close routine
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125 may well have freed some necessary storage structures, for
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126 example.
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127
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128 void Lstream_rewind (Lstream *stream)
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129 Rewind the stream to the beginning.
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130 */
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131
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132 #define DEFAULT_BLOCK_BUFFERING_SIZE 512
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133 #define MAX_READ_SIZE 512
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134
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135 static Lisp_Object
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136 mark_lstream (Lisp_Object obj)
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137 {
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138 Lstream *lstr = XLSTREAM (obj);
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139 return lstr->imp->marker ? (lstr->imp->marker) (obj) : Qnil;
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140 }
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141
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142 static void
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143 print_lstream (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
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144 {
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145 Lstream *lstr = XLSTREAM (obj);
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146 char buf[200];
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147
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148 sprintf (buf, "#<INTERNAL OBJECT (XEmacs bug?) (%s lstream) 0x%lx>",
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149 lstr->imp->name, (long) lstr);
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150 write_c_string (buf, printcharfun);
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151 }
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152
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153 static void
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154 finalize_lstream (void *header, int for_disksave)
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155 {
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156 /* WARNING WARNING WARNING. This function (and all finalize functions)
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157 may get called more than once on the same object, and may get called
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158 (at dump time) on objects that are not being released. */
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159 Lstream *lstr = (Lstream *) header;
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160
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161 #if 0 /* this may cause weird Broken Pipes? */
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162 if (for_disksave)
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163 {
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164 Lstream_pseudo_close (lstr);
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165 return;
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166 }
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167 #endif
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168 if (lstr->flags & LSTREAM_FL_IS_OPEN)
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169 {
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170 if (for_disksave)
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171 {
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172 if (lstr->flags & LSTREAM_FL_CLOSE_AT_DISKSAVE)
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173 Lstream_close (lstr);
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174 }
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175 else
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176 /* Just close. */
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177 Lstream_close (lstr);
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178 }
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179 }
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180
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181 static size_t
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442
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182 sizeof_lstream (const void *header)
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428
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183 {
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442
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184 const Lstream *lstr = (const Lstream *) header;
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428
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185 return sizeof (*lstr) + lstr->imp->size - 1;
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186 }
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187
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188 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION ("stream", lstream,
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189 mark_lstream, print_lstream,
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190 finalize_lstream, 0, 0, 0,
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191 sizeof_lstream, Lstream);
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192
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193 void
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194 Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering,
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195 int buffering_size)
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196 {
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197 lstr->buffering = buffering;
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198 switch (buffering)
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199 {
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200 case LSTREAM_UNBUFFERED:
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201 lstr->buffering_size = 0; break;
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202 case LSTREAM_BLOCK_BUFFERED:
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203 lstr->buffering_size = DEFAULT_BLOCK_BUFFERING_SIZE; break;
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204 case LSTREAM_BLOCKN_BUFFERED:
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205 lstr->buffering_size = buffering_size; break;
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206 case LSTREAM_LINE_BUFFERED:
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207 case LSTREAM_UNLIMITED:
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208 lstr->buffering_size = INT_MAX; break;
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209 }
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210 }
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211
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442
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212 static const Lstream_implementation *lstream_types[32];
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428
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213 static Lisp_Object Vlstream_free_list[32];
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214 static int lstream_type_count;
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215
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216 Lstream *
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442
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217 Lstream_new (const Lstream_implementation *imp, const char *mode)
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428
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218 {
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219 Lstream *p;
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220 int i;
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221
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222 for (i = 0; i < lstream_type_count; i++)
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223 {
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224 if (lstream_types[i] == imp)
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225 break;
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226 }
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227
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228 if (i == lstream_type_count)
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229 {
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230 assert (lstream_type_count < countof (lstream_types));
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231 lstream_types[lstream_type_count] = imp;
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232 Vlstream_free_list[lstream_type_count] =
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233 make_lcrecord_list (sizeof (*p) + imp->size - 1,
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234 &lrecord_lstream);
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235 lstream_type_count++;
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236 }
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237
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238 p = XLSTREAM (allocate_managed_lcrecord (Vlstream_free_list[i]));
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239 /* Zero it out, except the header. */
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240 memset ((char *) p + sizeof (p->header), 0,
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241 sizeof (*p) - sizeof (p->header) + imp->size - 1);
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242 p->imp = imp;
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243 Lstream_set_buffering (p, LSTREAM_BLOCK_BUFFERED, 0);
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244 p->flags = LSTREAM_FL_IS_OPEN;
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245
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246 /* convert mode (one of "r", "w", "rc", "wc") to p->flags */
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247 assert (mode[0] == 'r' || mode[0] == 'w');
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248 assert (mode[1] == 'c' || mode[1] == '\0');
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249 p->flags |= (mode[0] == 'r' ? LSTREAM_FL_READ : LSTREAM_FL_WRITE);
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250 if (mode[1] == 'c')
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251 p->flags |= LSTREAM_FL_NO_PARTIAL_CHARS;
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252
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253 return p;
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254 }
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255
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256 void
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257 Lstream_set_character_mode (Lstream *lstr)
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258 {
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259 lstr->flags |= LSTREAM_FL_NO_PARTIAL_CHARS;
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260 }
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261
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262 void
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263 Lstream_delete (Lstream *lstr)
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264 {
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265 int i;
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266 Lisp_Object val;
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267
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268 XSETLSTREAM (val, lstr);
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269 for (i = 0; i < lstream_type_count; i++)
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270 {
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271 if (lstream_types[i] == lstr->imp)
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272 {
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273 free_managed_lcrecord (Vlstream_free_list[i], val);
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274 return;
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275 }
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276 }
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277
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278 abort ();
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279 }
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280
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281 #define Lstream_internal_error(reason, lstr) \
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282 Lstream_signal_simple_error ("Internal error: " reason, lstr)
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283
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442
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284 static void Lstream_signal_simple_error (const char *reason, Lstream *lstr)
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428
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285 {
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286 Lisp_Object obj;
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287 XSETLSTREAM (obj, lstr);
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288 signal_simple_error (reason, obj);
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289 }
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290
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291 void
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292 Lstream_reopen (Lstream *lstr)
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293 {
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294 if (lstr->flags & LSTREAM_FL_IS_OPEN)
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295 Lstream_internal_error ("lstream already open", lstr);
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296 lstr->flags |= LSTREAM_FL_IS_OPEN;
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297 }
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298
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|
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299 /* Attempt to flush out all of the buffered data for writing. */
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300
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301 int
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302 Lstream_flush_out (Lstream *lstr)
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303 {
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304 ssize_t num_written;
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305
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306 while (lstr->out_buffer_ind > 0)
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307 {
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308 size_t size = lstr->out_buffer_ind;
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309 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
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310 Lstream_internal_error ("lstream not open", lstr);
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311 if (! (lstr->flags & LSTREAM_FL_WRITE))
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312 Lstream_internal_error ("lstream not open for writing", lstr);
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313 if (!lstr->imp->writer)
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314 Lstream_internal_error ("lstream has no writer", lstr);
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315
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316 if (lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS)
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|
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317 /* It's quite possible for us to get passed an incomplete
|
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318 character at the end. We need to spit back that
|
|
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319 incomplete character. */
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320 {
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|
442
|
321 const unsigned char *data = lstr->out_buffer;
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322 const unsigned char *dataend = data + size - 1;
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428
|
323 assert (size > 0); /* safety check ... */
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|
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324 /* Optimize the most common case. */
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|
|
325 if (!BYTE_ASCII_P (*dataend))
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326 {
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|
|
327 /* Go back to the beginning of the last (and possibly partial)
|
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|
328 character, and bump forward to see if the character is
|
|
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329 complete. */
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330 VALIDATE_CHARPTR_BACKWARD (dataend);
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331 if (dataend + REP_BYTES_BY_FIRST_BYTE (*dataend) != data + size)
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|
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332 /* If not, chop the size down to ignore the last char
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333 and stash it away for next time. */
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334 size = dataend - data;
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|
|
335 /* If we don't even have one character to write, then just
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336 skip out. */
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|
337 if (size == 0)
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|
338 break;
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|
|
339 }
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|
|
340 }
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|
|
341
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|
|
342 num_written = (lstr->imp->writer) (lstr, lstr->out_buffer, size);
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|
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343 if (num_written == 0)
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|
344 /* If nothing got written, then just hold the data. This may
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|
|
345 occur, for example, if this stream does non-blocking I/O;
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|
346 the attempt to write the data might have resulted in an
|
|
|
347 EWOULDBLOCK error. */
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|
|
348 return 0;
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|
|
349 else if (num_written >= lstr->out_buffer_ind)
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|
|
350 lstr->out_buffer_ind = 0;
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|
|
351 else if (num_written > 0)
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|
|
352 {
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|
|
353 memmove (lstr->out_buffer, lstr->out_buffer + num_written,
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|
|
354 lstr->out_buffer_ind - num_written);
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|
|
355 lstr->out_buffer_ind -= num_written;
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|
|
356 }
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|
|
357 else
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|
|
358 /* If error, just hold the data, for similar reasons as above. */
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|
|
359 return -1;
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|
|
360 }
|
|
|
361
|
|
|
362 if (lstr->imp->flusher)
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|
|
363 return (lstr->imp->flusher) (lstr);
|
|
|
364
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|
|
365 return 0;
|
|
|
366 }
|
|
|
367
|
|
|
368 int
|
|
|
369 Lstream_flush (Lstream *lstr)
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|
|
370 {
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|
|
371 if (Lstream_flush_out (lstr) < 0)
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|
|
372 return -1;
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|
|
373
|
|
|
374 /* clear out buffered data */
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|
|
375 lstr->in_buffer_current = lstr->in_buffer_ind = 0;
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|
|
376 lstr->unget_buffer_ind = 0;
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|
|
377
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|
|
378 return 0;
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|
|
379 }
|
|
|
380
|
|
|
381 /* We want to add NUM characters. This function ensures that the
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|
|
382 buffer is large enough for this (per the buffering size specified
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|
|
383 in the stream) and returns the number of characters we can
|
|
|
384 actually write. If FORCE is set, ignore the buffering size
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|
|
385 and go ahead and make space for all the chars even if it exceeds
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|
|
386 the buffering size. (This is used to deal with the possibility
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|
|
387 that the stream writer might refuse to write any bytes now, e.g.
|
|
|
388 if it's getting EWOULDBLOCK errors. We have to keep stocking them
|
|
|
389 up until they can be written, so as to avoid losing data. */
|
|
|
390
|
|
|
391 static size_t
|
|
|
392 Lstream_adding (Lstream *lstr, size_t num, int force)
|
|
|
393 {
|
|
430
|
394 size_t size = num + lstr->out_buffer_ind;
|
|
|
395
|
|
|
396 if (size <= lstr->out_buffer_size)
|
|
|
397 return num;
|
|
|
398
|
|
428
|
399 /* Maybe chop it down so that we don't buffer more characters
|
|
|
400 than our advertised buffering size. */
|
|
430
|
401 if ((size > lstr->buffering_size) && !force)
|
|
|
402 {
|
|
|
403 size = lstr->buffering_size;
|
|
|
404 /* There might be more data buffered than the buffering size. */
|
|
|
405 if (size <= lstr->out_buffer_ind)
|
|
|
406 return 0;
|
|
|
407 }
|
|
|
408
|
|
|
409 DO_REALLOC (lstr->out_buffer, lstr->out_buffer_size, size, unsigned char);
|
|
|
410
|
|
|
411 return size - lstr->out_buffer_ind;
|
|
428
|
412 }
|
|
|
413
|
|
|
414 /* Like Lstream_write(), but does not handle line-buffering correctly. */
|
|
|
415
|
|
|
416 static ssize_t
|
|
442
|
417 Lstream_write_1 (Lstream *lstr, const void *data, size_t size)
|
|
428
|
418 {
|
|
442
|
419 const unsigned char *p = (const unsigned char *) data;
|
|
428
|
420 ssize_t off = 0;
|
|
|
421 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
|
422 Lstream_internal_error ("lstream not open", lstr);
|
|
|
423 if (! (lstr->flags & LSTREAM_FL_WRITE))
|
|
|
424 Lstream_internal_error ("lstream not open for writing", lstr);
|
|
|
425 {
|
|
|
426 int couldnt_write_last_time = 0;
|
|
|
427
|
|
|
428 while (1)
|
|
|
429 {
|
|
|
430 /* Figure out how much we can add to the buffer */
|
|
|
431 size_t chunk = Lstream_adding (lstr, size, 0);
|
|
|
432 if (chunk == 0)
|
|
|
433 {
|
|
|
434 if (couldnt_write_last_time)
|
|
|
435 /* Ung, we ran out of space and tried to flush
|
|
|
436 the buffer, but it didn't work because the stream
|
|
|
437 writer is refusing to accept any data. So we
|
|
|
438 just have to squirrel away all the rest of the
|
|
|
439 stuff. */
|
|
|
440 chunk = Lstream_adding (lstr, size, 1);
|
|
|
441 else
|
|
|
442 couldnt_write_last_time = 1;
|
|
|
443 }
|
|
|
444 /* Do it. */
|
|
|
445 if (chunk > 0)
|
|
|
446 {
|
|
|
447 memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off, chunk);
|
|
|
448 lstr->out_buffer_ind += chunk;
|
|
|
449 lstr->byte_count += chunk;
|
|
|
450 size -= chunk;
|
|
|
451 off += chunk;
|
|
|
452 }
|
|
|
453 /* If the buffer is full and we have more to add, flush it out. */
|
|
|
454 if (size > 0)
|
|
|
455 {
|
|
|
456 if (Lstream_flush_out (lstr) < 0)
|
|
|
457 {
|
|
|
458 if (off == 0)
|
|
|
459 return -1;
|
|
|
460 else
|
|
|
461 return off;
|
|
|
462 }
|
|
|
463 }
|
|
|
464 else
|
|
|
465 break;
|
|
|
466 }
|
|
|
467 }
|
|
|
468 return off;
|
|
|
469 }
|
|
|
470
|
|
|
471 /* If the stream is not line-buffered, then we can just call
|
|
|
472 Lstream_write_1(), which writes in chunks. Otherwise, we
|
|
|
473 repeatedly call Lstream_putc(), which knows how to handle
|
|
440
|
474 line buffering. Returns number of bytes written. */
|
|
428
|
475
|
|
|
476 ssize_t
|
|
442
|
477 Lstream_write (Lstream *lstr, const void *data, size_t size)
|
|
428
|
478 {
|
|
|
479 size_t i;
|
|
442
|
480 const unsigned char *p = (const unsigned char *) data;
|
|
428
|
481
|
|
|
482 if (size == 0)
|
|
|
483 return size;
|
|
|
484 if (lstr->buffering != LSTREAM_LINE_BUFFERED)
|
|
|
485 return Lstream_write_1 (lstr, data, size);
|
|
|
486 for (i = 0; i < size; i++)
|
|
|
487 {
|
|
|
488 if (Lstream_putc (lstr, p[i]) < 0)
|
|
|
489 break;
|
|
|
490 }
|
|
440
|
491 return i == 0 ? -1 : (ssize_t) i;
|
|
428
|
492 }
|
|
|
493
|
|
|
494 int
|
|
|
495 Lstream_was_blocked_p (Lstream *lstr)
|
|
|
496 {
|
|
|
497 return lstr->imp->was_blocked_p ? lstr->imp->was_blocked_p (lstr) : 0;
|
|
|
498 }
|
|
|
499
|
|
|
500 static int
|
|
|
501 Lstream_raw_read (Lstream *lstr, unsigned char *buffer, size_t size)
|
|
|
502 {
|
|
|
503 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
|
504 Lstream_internal_error ("lstream not open", lstr);
|
|
|
505 if (! (lstr->flags & LSTREAM_FL_READ))
|
|
|
506 Lstream_internal_error ("lstream not open for reading", lstr);
|
|
|
507 if (!lstr->imp->reader)
|
|
|
508 Lstream_internal_error ("lstream has no reader", lstr);
|
|
|
509
|
|
|
510 return (lstr->imp->reader) (lstr, buffer, size);
|
|
|
511 }
|
|
|
512
|
|
|
513 /* Assuming the buffer is empty, fill it up again. */
|
|
|
514
|
|
|
515 static ssize_t
|
|
|
516 Lstream_read_more (Lstream *lstr)
|
|
|
517 {
|
|
|
518 #if 0
|
|
|
519 ssize_t size_needed = max (1, min (MAX_READ_SIZE, lstr->buffering_size));
|
|
|
520 #else
|
|
|
521 /* If someone requested a larger buffer size, so be it! */
|
|
|
522 ssize_t size_needed = max (1, lstr->buffering_size);
|
|
|
523 #endif
|
|
|
524 ssize_t size_gotten;
|
|
|
525
|
|
|
526 DO_REALLOC (lstr->in_buffer, lstr->in_buffer_size,
|
|
|
527 size_needed, unsigned char);
|
|
|
528 size_gotten = Lstream_raw_read (lstr, lstr->in_buffer, size_needed);
|
|
|
529 lstr->in_buffer_current = max (0, size_gotten);
|
|
|
530 lstr->in_buffer_ind = 0;
|
|
|
531 return size_gotten < 0 ? -1 : size_gotten;
|
|
|
532 }
|
|
|
533
|
|
|
534 ssize_t
|
|
|
535 Lstream_read (Lstream *lstr, void *data, size_t size)
|
|
|
536 {
|
|
|
537 unsigned char *p = (unsigned char *) data;
|
|
|
538 size_t off = 0;
|
|
|
539 size_t chunk;
|
|
|
540 int error_occurred = 0;
|
|
|
541
|
|
|
542 if (size == 0)
|
|
|
543 return 0;
|
|
|
544
|
|
|
545 /* First try to get some data from the unget buffer */
|
|
|
546 chunk = min (size, lstr->unget_buffer_ind);
|
|
|
547 if (chunk > 0)
|
|
|
548 {
|
|
|
549 /* The bytes come back in reverse order. */
|
|
|
550 for (; off < chunk; off++)
|
|
|
551 p[off] = lstr->unget_buffer[--lstr->unget_buffer_ind];
|
|
|
552 lstr->byte_count += chunk;
|
|
|
553 size -= chunk;
|
|
|
554 }
|
|
|
555
|
|
|
556 while (size > 0)
|
|
|
557 {
|
|
|
558 /* Take whatever we can from the in buffer */
|
|
|
559 chunk = min (size, lstr->in_buffer_current - lstr->in_buffer_ind);
|
|
|
560 if (chunk > 0)
|
|
|
561 {
|
|
|
562 memcpy (p + off, lstr->in_buffer + lstr->in_buffer_ind, chunk);
|
|
|
563 lstr->in_buffer_ind += chunk;
|
|
|
564 lstr->byte_count += chunk;
|
|
|
565 size -= chunk;
|
|
|
566 off += chunk;
|
|
|
567 }
|
|
|
568
|
|
|
569 /* If we need some more, try to get some more from the stream's end */
|
|
|
570 if (size > 0)
|
|
|
571 {
|
|
|
572 ssize_t retval = Lstream_read_more (lstr);
|
|
|
573 if (retval < 0)
|
|
|
574 error_occurred = 1;
|
|
|
575 if (retval <= 0)
|
|
|
576 break;
|
|
|
577 }
|
|
|
578 }
|
|
|
579
|
|
|
580 /* #### Beware of OFF ending up 0. */
|
|
|
581 if ((lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS) && off > 0)
|
|
|
582 {
|
|
|
583 /* It's quite possible for us to get passed an incomplete
|
|
|
584 character at the end. We need to spit back that
|
|
|
585 incomplete character. */
|
|
442
|
586 const unsigned char *dataend = p + off - 1;
|
|
428
|
587 /* Optimize the most common case. */
|
|
|
588 if (!BYTE_ASCII_P (*dataend))
|
|
|
589 {
|
|
|
590 /* Go back to the beginning of the last (and possibly partial)
|
|
|
591 character, and bump forward to see if the character is
|
|
|
592 complete. */
|
|
|
593 VALIDATE_CHARPTR_BACKWARD (dataend);
|
|
|
594 if (dataend + REP_BYTES_BY_FIRST_BYTE (*dataend) != p + off)
|
|
|
595 {
|
|
|
596 size_t newoff = dataend - p;
|
|
|
597 /* If not, chop the size down to ignore the last char
|
|
|
598 and stash it away for next time. */
|
|
|
599 Lstream_unread (lstr, dataend, off - newoff);
|
|
|
600 off = newoff;
|
|
|
601 }
|
|
|
602 }
|
|
|
603 }
|
|
|
604
|
|
|
605 return off == 0 && error_occurred ? -1 : (ssize_t) off;
|
|
|
606 }
|
|
|
607
|
|
|
608 void
|
|
442
|
609 Lstream_unread (Lstream *lstr, const void *data, size_t size)
|
|
428
|
610 {
|
|
442
|
611 const unsigned char *p = (const unsigned char *) data;
|
|
428
|
612
|
|
|
613 /* Make sure buffer is big enough */
|
|
|
614 DO_REALLOC (lstr->unget_buffer, lstr->unget_buffer_size,
|
|
|
615 lstr->unget_buffer_ind + size, unsigned char);
|
|
|
616
|
|
|
617 lstr->byte_count -= size;
|
|
|
618
|
|
|
619 /* Bytes have to go on in reverse order -- they are reversed
|
|
|
620 again when read back. */
|
|
|
621 while (size--)
|
|
|
622 lstr->unget_buffer[lstr->unget_buffer_ind++] = p[size];
|
|
|
623 }
|
|
|
624
|
|
|
625 int
|
|
|
626 Lstream_rewind (Lstream *lstr)
|
|
|
627 {
|
|
|
628 if (!lstr->imp->rewinder)
|
|
|
629 Lstream_internal_error ("lstream has no rewinder", lstr);
|
|
|
630 if (Lstream_flush (lstr) < 0)
|
|
|
631 return -1;
|
|
|
632 lstr->byte_count = 0;
|
|
|
633 return (lstr->imp->rewinder) (lstr);
|
|
|
634 }
|
|
|
635
|
|
|
636 int
|
|
|
637 Lstream_seekable_p (Lstream *lstr)
|
|
|
638 {
|
|
|
639 if (!lstr->imp->rewinder)
|
|
|
640 return 0;
|
|
|
641 if (!lstr->imp->seekable_p)
|
|
|
642 return 1;
|
|
|
643 return (lstr->imp->seekable_p) (lstr);
|
|
|
644 }
|
|
|
645
|
|
|
646 static int
|
|
|
647 Lstream_pseudo_close (Lstream *lstr)
|
|
|
648 {
|
|
|
649 if (!lstr->flags & LSTREAM_FL_IS_OPEN)
|
|
|
650 Lstream_internal_error ("lstream is not open", lstr);
|
|
|
651
|
|
|
652 /* don't check errors here -- best not to risk file descriptor loss */
|
|
|
653 return Lstream_flush (lstr);
|
|
|
654 }
|
|
|
655
|
|
|
656 int
|
|
|
657 Lstream_close (Lstream *lstr)
|
|
|
658 {
|
|
|
659 int rc = 0;
|
|
|
660
|
|
|
661 if (lstr->flags & LSTREAM_FL_IS_OPEN)
|
|
|
662 {
|
|
|
663 rc = Lstream_pseudo_close (lstr);
|
|
|
664 /*
|
|
|
665 * We used to return immediately if the closer method reported
|
|
|
666 * failure, leaving the stream open. But this is no good, for
|
|
|
667 * the following reasons.
|
|
|
668 *
|
|
|
669 * 1. The finalizer method used in GC makes no provision for
|
|
|
670 * failure, so we must not return without freeing buffer
|
|
|
671 * memory.
|
|
|
672 *
|
|
|
673 * 2. The closer method may have already freed some memory
|
|
|
674 * used for I/O in this stream. E.g. encoding_closer frees
|
|
|
675 * ENCODING_STREAM_DATA(stream)->runoff. If a writer method
|
|
|
676 * tries to use this buffer later, it will write into memory
|
|
|
677 * that may have been allocated elsewhere. Sometime later
|
|
|
678 * you will see a sign that says "Welcome to Crash City."
|
|
|
679 *
|
|
|
680 * 3. The closer can report failure if a flush fails in the
|
|
|
681 * other stream in a MULE encoding/decoding stream pair.
|
|
|
682 * The other stream in the pair is closed, but returning
|
|
|
683 * early leaves the current stream open. If we try to
|
|
|
684 * flush the current stream later, we will crash when the
|
|
|
685 * flusher notices that the other end stream is closed.
|
|
|
686 *
|
|
|
687 * So, we no longer abort the close if the closer method
|
|
|
688 * reports some kind of failure. We still report the failure
|
|
|
689 * to the caller.
|
|
|
690 */
|
|
|
691 if (lstr->imp->closer)
|
|
|
692 if ((lstr->imp->closer) (lstr) < 0)
|
|
|
693 rc = -1;
|
|
|
694 }
|
|
|
695
|
|
|
696 lstr->flags &= ~LSTREAM_FL_IS_OPEN;
|
|
|
697 lstr->byte_count = 0;
|
|
|
698 /* Note that Lstream_flush() reset all the buffer indices. That way,
|
|
|
699 the next call to Lstream_putc(), Lstream_getc(), or Lstream_ungetc()
|
|
|
700 on a closed stream will call into the function equivalents, which will
|
|
|
701 cause an error. */
|
|
|
702
|
|
|
703 /* We set the pointers to 0 so that we don't lose when this function
|
|
|
704 is called more than once on the same object */
|
|
|
705 if (lstr->out_buffer)
|
|
|
706 {
|
|
|
707 xfree (lstr->out_buffer);
|
|
|
708 lstr->out_buffer = 0;
|
|
|
709 }
|
|
|
710 if (lstr->in_buffer)
|
|
|
711 {
|
|
|
712 xfree (lstr->in_buffer);
|
|
|
713 lstr->in_buffer = 0;
|
|
|
714 }
|
|
|
715 if (lstr->unget_buffer)
|
|
|
716 {
|
|
|
717 xfree (lstr->unget_buffer);
|
|
|
718 lstr->unget_buffer = 0;
|
|
|
719 }
|
|
|
720
|
|
|
721 return rc;
|
|
|
722 }
|
|
|
723
|
|
|
724 int
|
|
|
725 Lstream_fputc (Lstream *lstr, int c)
|
|
|
726 {
|
|
|
727 unsigned char ch = (unsigned char) c;
|
|
|
728 ssize_t retval = Lstream_write_1 (lstr, &ch, 1);
|
|
|
729 if (retval >= 0 && lstr->buffering == LSTREAM_LINE_BUFFERED && ch == '\n')
|
|
|
730 return Lstream_flush_out (lstr);
|
|
|
731 return retval < 0 ? -1 : 0;
|
|
|
732 }
|
|
|
733
|
|
|
734 int
|
|
|
735 Lstream_fgetc (Lstream *lstr)
|
|
|
736 {
|
|
|
737 unsigned char ch;
|
|
|
738 if (Lstream_read (lstr, &ch, 1) <= 0)
|
|
|
739 return -1;
|
|
|
740 return ch;
|
|
|
741 }
|
|
|
742
|
|
|
743 void
|
|
|
744 Lstream_fungetc (Lstream *lstr, int c)
|
|
|
745 {
|
|
|
746 unsigned char ch = (unsigned char) c;
|
|
|
747 Lstream_unread (lstr, &ch, 1);
|
|
|
748 }
|
|
|
749
|
|
|
750
|
|
|
751 /************************ some stream implementations *********************/
|
|
|
752
|
|
|
753 /*********** a stdio stream ***********/
|
|
|
754
|
|
|
755 struct stdio_stream
|
|
|
756 {
|
|
|
757 FILE *file;
|
|
|
758 int closing;
|
|
|
759 };
|
|
|
760
|
|
|
761 #define STDIO_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, stdio)
|
|
|
762
|
|
|
763 DEFINE_LSTREAM_IMPLEMENTATION ("stdio", lstream_stdio,
|
|
|
764 sizeof (struct stdio_stream));
|
|
|
765
|
|
|
766 static Lisp_Object
|
|
442
|
767 make_stdio_stream_1 (FILE *stream, int flags, const char *mode)
|
|
428
|
768 {
|
|
|
769 Lisp_Object obj;
|
|
|
770 Lstream *lstr = Lstream_new (lstream_stdio, mode);
|
|
|
771 struct stdio_stream *str = STDIO_STREAM_DATA (lstr);
|
|
|
772 str->file = stream;
|
|
|
773 str->closing = flags & LSTR_CLOSING;
|
|
|
774 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE;
|
|
|
775 XSETLSTREAM (obj, lstr);
|
|
|
776 return obj;
|
|
|
777 }
|
|
|
778
|
|
|
779 Lisp_Object
|
|
|
780 make_stdio_input_stream (FILE *stream, int flags)
|
|
|
781 {
|
|
|
782 return make_stdio_stream_1 (stream, flags, "r");
|
|
|
783 }
|
|
|
784
|
|
|
785 Lisp_Object
|
|
|
786 make_stdio_output_stream (FILE *stream, int flags)
|
|
|
787 {
|
|
|
788 return make_stdio_stream_1 (stream, flags, "w");
|
|
|
789 }
|
|
|
790
|
|
|
791 /* #### From reading the Unix 98 specification, it appears that if we
|
|
|
792 want stdio_reader() to be completely correct, we should check for
|
|
|
793 0 < val < size and if so, check to see if an error has occurred.
|
|
|
794 If an error has occurred, but val is non-zero, we should go ahead
|
|
|
795 and act as if the read was successful, but remember in some fashion
|
|
|
796 or other, that an error has occurred, and report that on the next
|
|
|
797 call to stdio_reader instead of calling fread() again.
|
|
|
798
|
|
|
799 Currently, in such a case, we end up calling fread() twice and we
|
|
|
800 assume that
|
|
|
801
|
|
|
802 1) this is not harmful, and
|
|
|
803 2) the error will still be reported on the second read.
|
|
|
804
|
|
|
805 This is probably reasonable, so I don't think we should change this
|
|
|
806 code (it could even be argued that the error might have fixed
|
|
|
807 itself, so we should do the fread() again. */
|
|
|
808
|
|
|
809 static ssize_t
|
|
|
810 stdio_reader (Lstream *stream, unsigned char *data, size_t size)
|
|
|
811 {
|
|
|
812 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
813 size_t val = fread (data, 1, size, str->file);
|
|
|
814 if (!val && ferror (str->file))
|
|
|
815 return -1;
|
|
|
816 return val;
|
|
|
817 }
|
|
|
818
|
|
|
819 static ssize_t
|
|
442
|
820 stdio_writer (Lstream *stream, const unsigned char *data, size_t size)
|
|
428
|
821 {
|
|
|
822 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
823 size_t val = fwrite (data, 1, size, str->file);
|
|
|
824 if (!val && ferror (str->file))
|
|
|
825 return -1;
|
|
|
826 return val;
|
|
|
827 }
|
|
|
828
|
|
|
829 static int
|
|
|
830 stdio_rewinder (Lstream *stream)
|
|
|
831 {
|
|
|
832 rewind (STDIO_STREAM_DATA (stream)->file);
|
|
|
833 return 0;
|
|
|
834 }
|
|
|
835
|
|
|
836 static int
|
|
|
837 stdio_seekable_p (Lstream *stream)
|
|
|
838 {
|
|
|
839 struct stat lestat;
|
|
|
840 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
841
|
|
|
842 if (fstat (fileno (str->file), &lestat) < 0)
|
|
|
843 return 0;
|
|
|
844 return S_ISREG (lestat.st_mode);
|
|
|
845 }
|
|
|
846
|
|
|
847 static int
|
|
|
848 stdio_flusher (Lstream *stream)
|
|
|
849 {
|
|
|
850 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
851 if (stream->flags & LSTREAM_FL_WRITE)
|
|
|
852 return fflush (str->file);
|
|
|
853 else
|
|
|
854 return 0;
|
|
|
855 }
|
|
|
856
|
|
|
857 static int
|
|
|
858 stdio_closer (Lstream *stream)
|
|
|
859 {
|
|
|
860 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
861 if (str->closing)
|
|
|
862 return fclose (str->file);
|
|
|
863 else
|
|
|
864 if (stream->flags & LSTREAM_FL_WRITE)
|
|
|
865 return fflush (str->file);
|
|
|
866 else
|
|
|
867 return 0;
|
|
|
868 }
|
|
|
869
|
|
|
870 /*********** a file descriptor ***********/
|
|
|
871
|
|
|
872 struct filedesc_stream
|
|
|
873 {
|
|
|
874 int fd;
|
|
|
875 int pty_max_bytes;
|
|
|
876 Bufbyte eof_char;
|
|
|
877 int starting_pos;
|
|
|
878 int current_pos;
|
|
|
879 int end_pos;
|
|
|
880 int chars_sans_newline;
|
|
|
881 unsigned int closing :1;
|
|
|
882 unsigned int allow_quit :1;
|
|
|
883 unsigned int blocked_ok :1;
|
|
|
884 unsigned int pty_flushing :1;
|
|
|
885 unsigned int blocking_error_p :1;
|
|
|
886 };
|
|
|
887
|
|
|
888 #define FILEDESC_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, filedesc)
|
|
|
889
|
|
|
890 DEFINE_LSTREAM_IMPLEMENTATION ("filedesc", lstream_filedesc,
|
|
|
891 sizeof (struct filedesc_stream));
|
|
|
892
|
|
|
893 /* Make a stream that reads from or writes to a file descriptor FILEDESC.
|
|
|
894 OFFSET is the offset from the *current* file pointer that the reading
|
|
|
895 should start at. COUNT is the number of bytes to be read (it is
|
|
|
896 ignored when writing); -1 for unlimited. */
|
|
|
897 static Lisp_Object
|
|
|
898 make_filedesc_stream_1 (int filedesc, int offset, int count, int flags,
|
|
442
|
899 const char *mode)
|
|
428
|
900 {
|
|
|
901 Lisp_Object obj;
|
|
|
902 Lstream *lstr = Lstream_new (lstream_filedesc, mode);
|
|
|
903 struct filedesc_stream *fstr = FILEDESC_STREAM_DATA (lstr);
|
|
|
904 fstr->fd = filedesc;
|
|
|
905 fstr->closing = !!(flags & LSTR_CLOSING);
|
|
|
906 fstr->allow_quit = !!(flags & LSTR_ALLOW_QUIT);
|
|
|
907 fstr->blocked_ok = !!(flags & LSTR_BLOCKED_OK);
|
|
|
908 fstr->pty_flushing = !!(flags & LSTR_PTY_FLUSHING);
|
|
|
909 fstr->blocking_error_p = 0;
|
|
|
910 fstr->chars_sans_newline = 0;
|
|
|
911 fstr->starting_pos = lseek (filedesc, offset, SEEK_CUR);
|
|
|
912 fstr->current_pos = max (fstr->starting_pos, 0);
|
|
|
913 if (count < 0)
|
|
|
914 fstr->end_pos = -1;
|
|
|
915 else
|
|
|
916 fstr->end_pos = fstr->starting_pos + count;
|
|
|
917 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE;
|
|
|
918 XSETLSTREAM (obj, lstr);
|
|
|
919 return obj;
|
|
|
920 }
|
|
|
921
|
|
|
922 Lisp_Object
|
|
|
923 make_filedesc_input_stream (int filedesc, int offset, int count, int flags)
|
|
|
924 {
|
|
|
925 return make_filedesc_stream_1 (filedesc, offset, count, flags, "r");
|
|
|
926 }
|
|
|
927
|
|
|
928 Lisp_Object
|
|
|
929 make_filedesc_output_stream (int filedesc, int offset, int count, int flags)
|
|
|
930 {
|
|
|
931 return make_filedesc_stream_1 (filedesc, offset, count, flags, "w");
|
|
|
932 }
|
|
|
933
|
|
|
934 static ssize_t
|
|
|
935 filedesc_reader (Lstream *stream, unsigned char *data, size_t size)
|
|
|
936 {
|
|
|
937 ssize_t nread;
|
|
|
938 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
939 if (str->end_pos >= 0)
|
|
|
940 size = min (size, (size_t) (str->end_pos - str->current_pos));
|
|
430
|
941 nread = str->allow_quit ?
|
|
|
942 read_allowing_quit (str->fd, data, size) :
|
|
|
943 read (str->fd, data, size);
|
|
428
|
944 if (nread > 0)
|
|
|
945 str->current_pos += nread;
|
|
|
946 return nread;
|
|
|
947 }
|
|
|
948
|
|
|
949 static int
|
|
|
950 errno_would_block_p (int val)
|
|
|
951 {
|
|
|
952 #ifdef EWOULDBLOCK
|
|
|
953 if (val == EWOULDBLOCK)
|
|
|
954 return 1;
|
|
|
955 #endif
|
|
|
956 #ifdef EAGAIN
|
|
|
957 if (val == EAGAIN)
|
|
|
958 return 1;
|
|
|
959 #endif
|
|
|
960 return 0;
|
|
|
961 }
|
|
|
962
|
|
|
963 static ssize_t
|
|
442
|
964 filedesc_writer (Lstream *stream, const unsigned char *data, size_t size)
|
|
428
|
965 {
|
|
|
966 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
967 ssize_t retval;
|
|
|
968 int need_newline = 0;
|
|
|
969
|
|
|
970 /* This function would be simple if it were not for the blasted
|
|
|
971 PTY max-bytes stuff. Why the hell can't they just have written
|
|
|
972 the PTY drivers right so this problem doesn't exist?
|
|
|
973
|
|
|
974 Maybe all the PTY crap here should be moved into another stream
|
|
|
975 that does nothing but periodically insert EOF's as necessary. */
|
|
|
976 if (str->pty_flushing)
|
|
|
977 {
|
|
|
978 /* To make life easy, only send out one line at the most. */
|
|
442
|
979 const unsigned char *ptr;
|
|
428
|
980
|
|
442
|
981 ptr = (const unsigned char *) memchr (data, '\n', size);
|
|
428
|
982 if (ptr)
|
|
|
983 need_newline = 1;
|
|
|
984 else
|
|
|
985 ptr = data + size;
|
|
|
986 if (ptr - data >= str->pty_max_bytes - str->chars_sans_newline)
|
|
|
987 {
|
|
|
988 ptr = data + str->pty_max_bytes - str->chars_sans_newline;
|
|
|
989 need_newline = 0;
|
|
|
990 }
|
|
|
991 size = ptr - data;
|
|
|
992 }
|
|
|
993
|
|
|
994 /**** start of non-PTY-crap ****/
|
|
|
995 if (size > 0)
|
|
430
|
996 retval = str->allow_quit ?
|
|
|
997 write_allowing_quit (str->fd, data, size) :
|
|
|
998 write (str->fd, data, size);
|
|
428
|
999 else
|
|
|
1000 retval = 0;
|
|
|
1001 if (retval < 0 && errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1002 {
|
|
|
1003 str->blocking_error_p = 1;
|
|
|
1004 return 0;
|
|
|
1005 }
|
|
|
1006 str->blocking_error_p = 0;
|
|
|
1007 if (retval < 0)
|
|
|
1008 return retval;
|
|
|
1009 /**** end non-PTY-crap ****/
|
|
|
1010
|
|
|
1011 if (str->pty_flushing)
|
|
|
1012 {
|
|
|
1013 str->chars_sans_newline += retval;
|
|
|
1014 /* Note that a newline was not among the bytes written out.
|
|
|
1015 Add to the number of non-newline bytes written out,
|
|
|
1016 and flush with an EOF if necessary. Be careful to
|
|
|
1017 keep track of write errors as we go along and look
|
|
|
1018 out for EWOULDBLOCK. */
|
|
|
1019 if (str->chars_sans_newline >= str->pty_max_bytes)
|
|
|
1020 {
|
|
430
|
1021 ssize_t retval2 = str->allow_quit ?
|
|
|
1022 write_allowing_quit (str->fd, &str->eof_char, 1) :
|
|
|
1023 write (str->fd, &str->eof_char, 1);
|
|
|
1024
|
|
428
|
1025 if (retval2 > 0)
|
|
|
1026 str->chars_sans_newline = 0;
|
|
|
1027 else if (retval2 < 0)
|
|
|
1028 {
|
|
|
1029 /* Error writing the EOF char. If nothing got written,
|
|
|
1030 then treat this as an error -- either return an error
|
|
|
1031 condition or set the blocking-error flag. */
|
|
|
1032 if (retval == 0)
|
|
|
1033 {
|
|
|
1034 if (errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1035 {
|
|
|
1036 str->blocking_error_p = 1;
|
|
|
1037 return 0;
|
|
|
1038 }
|
|
|
1039 else
|
|
|
1040 return retval2;
|
|
|
1041 }
|
|
|
1042 else
|
|
|
1043 return retval;
|
|
|
1044 }
|
|
|
1045 }
|
|
|
1046 }
|
|
|
1047
|
|
|
1048 /* The need_newline flag is necessary because otherwise when the
|
|
|
1049 first byte is a newline, we'd get stuck never writing anything
|
|
|
1050 in pty-flushing mode. */
|
|
|
1051 if (need_newline)
|
|
|
1052 {
|
|
|
1053 Bufbyte nl = '\n';
|
|
430
|
1054 ssize_t retval2 = str->allow_quit ?
|
|
|
1055 write_allowing_quit (str->fd, &nl, 1) :
|
|
|
1056 write (str->fd, &nl, 1);
|
|
|
1057
|
|
428
|
1058 if (retval2 > 0)
|
|
|
1059 {
|
|
|
1060 str->chars_sans_newline = 0;
|
|
|
1061 retval++;
|
|
|
1062 }
|
|
|
1063 else if (retval2 < 0)
|
|
|
1064 {
|
|
|
1065 /* Error writing the newline char. If nothing got written,
|
|
|
1066 then treat this as an error -- either return an error
|
|
|
1067 condition or set the blocking-error flag. */
|
|
|
1068 if (retval == 0)
|
|
|
1069 {
|
|
|
1070 if (errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1071 {
|
|
|
1072 str->blocking_error_p = 1;
|
|
|
1073 return 0;
|
|
|
1074 }
|
|
|
1075 else
|
|
|
1076 return retval2;
|
|
|
1077 }
|
|
|
1078 else
|
|
|
1079 return retval;
|
|
|
1080 }
|
|
|
1081 }
|
|
|
1082
|
|
|
1083 return retval;
|
|
|
1084 }
|
|
|
1085
|
|
|
1086 static int
|
|
|
1087 filedesc_rewinder (Lstream *stream)
|
|
|
1088 {
|
|
|
1089 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1090 if (str->starting_pos < 0 ||
|
|
|
1091 lseek (FILEDESC_STREAM_DATA (stream)->fd, str->starting_pos,
|
|
|
1092 SEEK_SET) == -1)
|
|
|
1093 return -1;
|
|
|
1094 else
|
|
|
1095 {
|
|
|
1096 str->current_pos = str->starting_pos;
|
|
|
1097 return 0;
|
|
|
1098 }
|
|
|
1099 }
|
|
|
1100
|
|
|
1101 static int
|
|
|
1102 filedesc_seekable_p (Lstream *stream)
|
|
|
1103 {
|
|
|
1104 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1105 if (str->starting_pos < 0)
|
|
|
1106 return 0;
|
|
|
1107 else
|
|
|
1108 {
|
|
|
1109 struct stat lestat;
|
|
|
1110
|
|
|
1111 if (fstat (str->fd, &lestat) < 0)
|
|
|
1112 return 0;
|
|
|
1113 return S_ISREG (lestat.st_mode);
|
|
|
1114 }
|
|
|
1115 }
|
|
|
1116
|
|
|
1117 static int
|
|
|
1118 filedesc_closer (Lstream *stream)
|
|
|
1119 {
|
|
|
1120 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1121 if (str->closing)
|
|
|
1122 return close (str->fd);
|
|
|
1123 else
|
|
|
1124 return 0;
|
|
|
1125 }
|
|
|
1126
|
|
|
1127 static int
|
|
|
1128 filedesc_was_blocked_p (Lstream *stream)
|
|
|
1129 {
|
|
|
1130 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1131 return str->blocking_error_p;
|
|
|
1132 }
|
|
|
1133
|
|
|
1134 void
|
|
|
1135 filedesc_stream_set_pty_flushing (Lstream *stream, int pty_max_bytes,
|
|
|
1136 Bufbyte eof_char)
|
|
|
1137 {
|
|
|
1138 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1139 str->pty_max_bytes = pty_max_bytes;
|
|
|
1140 str->eof_char = eof_char;
|
|
|
1141 str->pty_flushing = 1;
|
|
|
1142 }
|
|
|
1143
|
|
|
1144 int
|
|
|
1145 filedesc_stream_fd (Lstream *stream)
|
|
|
1146 {
|
|
|
1147 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1148 return str->fd;
|
|
|
1149 }
|
|
|
1150
|
|
|
1151 /*********** read from a Lisp string ***********/
|
|
|
1152
|
|
|
1153 #define LISP_STRING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, lisp_string)
|
|
|
1154
|
|
|
1155 struct lisp_string_stream
|
|
|
1156 {
|
|
|
1157 Lisp_Object obj;
|
|
|
1158 Bytecount init_offset;
|
|
|
1159 Bytecount offset, end;
|
|
|
1160 };
|
|
|
1161
|
|
|
1162 DEFINE_LSTREAM_IMPLEMENTATION ("lisp-string", lstream_lisp_string,
|
|
|
1163 sizeof (struct lisp_string_stream));
|
|
|
1164
|
|
|
1165 Lisp_Object
|
|
|
1166 make_lisp_string_input_stream (Lisp_Object string, Bytecount offset,
|
|
|
1167 Bytecount len)
|
|
|
1168 {
|
|
|
1169 Lisp_Object obj;
|
|
|
1170 Lstream *lstr;
|
|
|
1171 struct lisp_string_stream *str;
|
|
|
1172
|
|
|
1173 CHECK_STRING (string);
|
|
|
1174 if (len < 0)
|
|
|
1175 len = XSTRING_LENGTH (string) - offset;
|
|
|
1176 assert (offset >= 0);
|
|
|
1177 assert (len >= 0);
|
|
|
1178 assert (offset + len <= XSTRING_LENGTH (string));
|
|
|
1179
|
|
|
1180 lstr = Lstream_new (lstream_lisp_string, "r");
|
|
|
1181 str = LISP_STRING_STREAM_DATA (lstr);
|
|
|
1182 str->offset = offset;
|
|
|
1183 str->end = offset + len;
|
|
|
1184 str->init_offset = offset;
|
|
|
1185 str->obj = string;
|
|
|
1186 XSETLSTREAM (obj, lstr);
|
|
|
1187 return obj;
|
|
|
1188 }
|
|
|
1189
|
|
|
1190 static ssize_t
|
|
|
1191 lisp_string_reader (Lstream *stream, unsigned char *data, size_t size)
|
|
|
1192 {
|
|
|
1193 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream);
|
|
|
1194 /* Don't lose if the string shrank past us ... */
|
|
|
1195 Bytecount offset = min (str->offset, XSTRING_LENGTH (str->obj));
|
|
|
1196 Bufbyte *strstart = XSTRING_DATA (str->obj);
|
|
|
1197 Bufbyte *start = strstart + offset;
|
|
|
1198
|
|
|
1199 /* ... or if someone changed the string and we ended up in the
|
|
|
1200 middle of a character. */
|
|
|
1201 /* Being in the middle of a character is `normal' unless
|
|
|
1202 LSTREAM_NO_PARTIAL_CHARS - mrb */
|
|
|
1203 if (stream->flags & LSTREAM_FL_NO_PARTIAL_CHARS)
|
|
|
1204 VALIDATE_CHARPTR_BACKWARD (start);
|
|
|
1205 offset = start - strstart;
|
|
|
1206 size = min (size, (size_t) (str->end - offset));
|
|
|
1207 memcpy (data, start, size);
|
|
|
1208 str->offset = offset + size;
|
|
|
1209 return size;
|
|
|
1210 }
|
|
|
1211
|
|
|
1212 static int
|
|
|
1213 lisp_string_rewinder (Lstream *stream)
|
|
|
1214 {
|
|
|
1215 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream);
|
|
|
1216 int pos = str->init_offset;
|
|
|
1217 if (pos > str->end)
|
|
|
1218 pos = str->end;
|
|
|
1219 /* Don't lose if the string shrank past us ... */
|
|
|
1220 pos = min (pos, XSTRING_LENGTH (str->obj));
|
|
|
1221 /* ... or if someone changed the string and we ended up in the
|
|
|
1222 middle of a character. */
|
|
|
1223 {
|
|
|
1224 Bufbyte *strstart = XSTRING_DATA (str->obj);
|
|
|
1225 Bufbyte *start = strstart + pos;
|
|
|
1226 VALIDATE_CHARPTR_BACKWARD (start);
|
|
|
1227 pos = start - strstart;
|
|
|
1228 }
|
|
|
1229 str->offset = pos;
|
|
|
1230 return 0;
|
|
|
1231 }
|
|
|
1232
|
|
|
1233 static Lisp_Object
|
|
|
1234 lisp_string_marker (Lisp_Object stream)
|
|
|
1235 {
|
|
|
1236 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (XLSTREAM (stream));
|
|
|
1237 return str->obj;
|
|
|
1238 }
|
|
|
1239
|
|
|
1240 /*********** a fixed buffer ***********/
|
|
|
1241
|
|
|
1242 #define FIXED_BUFFER_STREAM_DATA(stream) \
|
|
|
1243 LSTREAM_TYPE_DATA (stream, fixed_buffer)
|
|
|
1244
|
|
|
1245 struct fixed_buffer_stream
|
|
|
1246 {
|
|
442
|
1247 const unsigned char *inbuf;
|
|
428
|
1248 unsigned char *outbuf;
|
|
|
1249 size_t size;
|
|
|
1250 size_t offset;
|
|
|
1251 };
|
|
|
1252
|
|
|
1253 DEFINE_LSTREAM_IMPLEMENTATION ("fixed-buffer", lstream_fixed_buffer,
|
|
|
1254 sizeof (struct fixed_buffer_stream));
|
|
|
1255
|
|
|
1256 Lisp_Object
|
|
442
|
1257 make_fixed_buffer_input_stream (const void *buf, size_t size)
|
|
428
|
1258 {
|
|
|
1259 Lisp_Object obj;
|
|
|
1260 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "r");
|
|
|
1261 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr);
|
|
440
|
1262 str->inbuf = (const unsigned char *) buf;
|
|
428
|
1263 str->size = size;
|
|
|
1264 XSETLSTREAM (obj, lstr);
|
|
|
1265 return obj;
|
|
|
1266 }
|
|
|
1267
|
|
|
1268 Lisp_Object
|
|
440
|
1269 make_fixed_buffer_output_stream (void *buf, size_t size)
|
|
428
|
1270 {
|
|
|
1271 Lisp_Object obj;
|
|
|
1272 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "w");
|
|
|
1273 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr);
|
|
440
|
1274 str->outbuf = (unsigned char *) buf;
|
|
428
|
1275 str->size = size;
|
|
|
1276 XSETLSTREAM (obj, lstr);
|
|
|
1277 return obj;
|
|
|
1278 }
|
|
|
1279
|
|
|
1280 static ssize_t
|
|
|
1281 fixed_buffer_reader (Lstream *stream, unsigned char *data, size_t size)
|
|
|
1282 {
|
|
|
1283 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream);
|
|
|
1284 size = min (size, str->size - str->offset);
|
|
|
1285 memcpy (data, str->inbuf + str->offset, size);
|
|
|
1286 str->offset += size;
|
|
|
1287 return size;
|
|
|
1288 }
|
|
|
1289
|
|
|
1290 static ssize_t
|
|
442
|
1291 fixed_buffer_writer (Lstream *stream, const unsigned char *data, size_t size)
|
|
428
|
1292 {
|
|
|
1293 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream);
|
|
|
1294 if (str->offset == str->size)
|
|
|
1295 {
|
|
|
1296 /* If we're at the end, just throw away the data and pretend
|
|
|
1297 we wrote all of it. If we return 0, then the lstream routines
|
|
|
1298 will try again and again to write it out. */
|
|
|
1299 return size;
|
|
|
1300 }
|
|
|
1301 size = min (size, str->size - str->offset);
|
|
|
1302 memcpy (str->outbuf + str->offset, data, size);
|
|
|
1303 str->offset += size;
|
|
|
1304 return size;
|
|
|
1305 }
|
|
|
1306
|
|
|
1307 static int
|
|
|
1308 fixed_buffer_rewinder (Lstream *stream)
|
|
|
1309 {
|
|
|
1310 FIXED_BUFFER_STREAM_DATA (stream)->offset = 0;
|
|
|
1311 return 0;
|
|
|
1312 }
|
|
|
1313
|
|
442
|
1314 const unsigned char *
|
|
428
|
1315 fixed_buffer_input_stream_ptr (Lstream *stream)
|
|
|
1316 {
|
|
|
1317 assert (stream->imp == lstream_fixed_buffer);
|
|
|
1318 return FIXED_BUFFER_STREAM_DATA (stream)->inbuf;
|
|
|
1319 }
|
|
|
1320
|
|
|
1321 unsigned char *
|
|
|
1322 fixed_buffer_output_stream_ptr (Lstream *stream)
|
|
|
1323 {
|
|
|
1324 assert (stream->imp == lstream_fixed_buffer);
|
|
|
1325 return FIXED_BUFFER_STREAM_DATA (stream)->outbuf;
|
|
|
1326 }
|
|
|
1327
|
|
|
1328 /*********** write to a resizing buffer ***********/
|
|
|
1329
|
|
|
1330 #define RESIZING_BUFFER_STREAM_DATA(stream) \
|
|
|
1331 LSTREAM_TYPE_DATA (stream, resizing_buffer)
|
|
|
1332
|
|
|
1333 struct resizing_buffer_stream
|
|
|
1334 {
|
|
|
1335 unsigned char *buf;
|
|
|
1336 size_t allocked;
|
|
|
1337 int max_stored;
|
|
|
1338 int stored;
|
|
|
1339 };
|
|
|
1340
|
|
|
1341 DEFINE_LSTREAM_IMPLEMENTATION ("resizing-buffer", lstream_resizing_buffer,
|
|
|
1342 sizeof (struct resizing_buffer_stream));
|
|
|
1343
|
|
|
1344 Lisp_Object
|
|
|
1345 make_resizing_buffer_output_stream (void)
|
|
|
1346 {
|
|
|
1347 Lisp_Object obj;
|
|
|
1348 XSETLSTREAM (obj, Lstream_new (lstream_resizing_buffer, "w"));
|
|
|
1349 return obj;
|
|
|
1350 }
|
|
|
1351
|
|
|
1352 static ssize_t
|
|
442
|
1353 resizing_buffer_writer (Lstream *stream, const unsigned char *data, size_t size)
|
|
428
|
1354 {
|
|
|
1355 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream);
|
|
|
1356 DO_REALLOC (str->buf, str->allocked, str->stored + size, unsigned char);
|
|
|
1357 memcpy (str->buf + str->stored, data, size);
|
|
|
1358 str->stored += size;
|
|
|
1359 str->max_stored = max (str->max_stored, str->stored);
|
|
|
1360 return size;
|
|
|
1361 }
|
|
|
1362
|
|
|
1363 static int
|
|
|
1364 resizing_buffer_rewinder (Lstream *stream)
|
|
|
1365 {
|
|
|
1366 RESIZING_BUFFER_STREAM_DATA (stream)->stored = 0;
|
|
|
1367 return 0;
|
|
|
1368 }
|
|
|
1369
|
|
|
1370 static int
|
|
|
1371 resizing_buffer_closer (Lstream *stream)
|
|
|
1372 {
|
|
|
1373 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream);
|
|
|
1374 if (str->buf)
|
|
|
1375 {
|
|
|
1376 xfree (str->buf);
|
|
|
1377 str->buf = 0;
|
|
|
1378 }
|
|
|
1379 return 0;
|
|
|
1380 }
|
|
|
1381
|
|
|
1382 unsigned char *
|
|
|
1383 resizing_buffer_stream_ptr (Lstream *stream)
|
|
|
1384 {
|
|
|
1385 return RESIZING_BUFFER_STREAM_DATA (stream)->buf;
|
|
|
1386 }
|
|
|
1387
|
|
|
1388 /*********** write to an unsigned-char dynarr ***********/
|
|
|
1389
|
|
|
1390 /* Note: If you have a dynarr whose type is not unsigned_char_dynarr
|
|
|
1391 but which is really just an unsigned_char_dynarr (e.g. its type
|
|
|
1392 is Bufbyte or Extbyte), just cast to unsigned_char_dynarr. */
|
|
|
1393
|
|
|
1394 #define DYNARR_STREAM_DATA(stream) \
|
|
|
1395 LSTREAM_TYPE_DATA (stream, dynarr)
|
|
|
1396
|
|
|
1397 struct dynarr_stream
|
|
|
1398 {
|
|
|
1399 unsigned_char_dynarr *dyn;
|
|
|
1400 };
|
|
|
1401
|
|
|
1402 DEFINE_LSTREAM_IMPLEMENTATION ("dynarr", lstream_dynarr,
|
|
|
1403 sizeof (struct dynarr_stream));
|
|
|
1404
|
|
|
1405 Lisp_Object
|
|
|
1406 make_dynarr_output_stream (unsigned_char_dynarr *dyn)
|
|
|
1407 {
|
|
|
1408 Lisp_Object obj;
|
|
|
1409 XSETLSTREAM (obj, Lstream_new (lstream_dynarr, "w"));
|
|
|
1410 DYNARR_STREAM_DATA (XLSTREAM (obj))->dyn = dyn;
|
|
|
1411 return obj;
|
|
|
1412 }
|
|
|
1413
|
|
|
1414 static ssize_t
|
|
442
|
1415 dynarr_writer (Lstream *stream, const unsigned char *data, size_t size)
|
|
428
|
1416 {
|
|
|
1417 struct dynarr_stream *str = DYNARR_STREAM_DATA (stream);
|
|
|
1418 Dynarr_add_many (str->dyn, data, size);
|
|
|
1419 return size;
|
|
|
1420 }
|
|
|
1421
|
|
|
1422 static int
|
|
|
1423 dynarr_rewinder (Lstream *stream)
|
|
|
1424 {
|
|
|
1425 Dynarr_reset (DYNARR_STREAM_DATA (stream)->dyn);
|
|
|
1426 return 0;
|
|
|
1427 }
|
|
|
1428
|
|
|
1429 static int
|
|
|
1430 dynarr_closer (Lstream *stream)
|
|
|
1431 {
|
|
|
1432 return 0;
|
|
|
1433 }
|
|
|
1434
|
|
|
1435 /************ read from or write to a Lisp buffer ************/
|
|
|
1436
|
|
|
1437 /* Note: Lisp-buffer read streams never return partial characters,
|
|
|
1438 and Lisp-buffer write streams expect to never get partial
|
|
|
1439 characters. */
|
|
|
1440
|
|
|
1441 #define LISP_BUFFER_STREAM_DATA(stream) \
|
|
|
1442 LSTREAM_TYPE_DATA (stream, lisp_buffer)
|
|
|
1443
|
|
|
1444 struct lisp_buffer_stream
|
|
|
1445 {
|
|
|
1446 Lisp_Object buffer;
|
|
|
1447 Lisp_Object orig_start;
|
|
|
1448 /* we use markers to properly deal with insertion/deletion */
|
|
|
1449 Lisp_Object start, end;
|
|
|
1450 int flags;
|
|
|
1451 };
|
|
|
1452
|
|
|
1453 DEFINE_LSTREAM_IMPLEMENTATION ("lisp-buffer", lstream_lisp_buffer,
|
|
|
1454 sizeof (struct lisp_buffer_stream));
|
|
|
1455
|
|
|
1456 static Lisp_Object
|
|
|
1457 make_lisp_buffer_stream_1 (struct buffer *buf, Bufpos start, Bufpos end,
|
|
442
|
1458 int flags, const char *mode)
|
|
428
|
1459 {
|
|
|
1460 Lisp_Object obj;
|
|
|
1461 Lstream *lstr;
|
|
|
1462 struct lisp_buffer_stream *str;
|
|
|
1463 Bufpos bmin, bmax;
|
|
|
1464 int reading = !strcmp (mode, "r");
|
|
|
1465
|
|
|
1466 /* Make sure the luser didn't pass "w" in. */
|
|
|
1467 if (!strcmp (mode, "w"))
|
|
|
1468 abort ();
|
|
|
1469
|
|
|
1470 if (flags & LSTR_IGNORE_ACCESSIBLE)
|
|
|
1471 {
|
|
|
1472 bmin = BUF_BEG (buf);
|
|
|
1473 bmax = BUF_Z (buf);
|
|
|
1474 }
|
|
|
1475 else
|
|
|
1476 {
|
|
|
1477 bmin = BUF_BEGV (buf);
|
|
|
1478 bmax = BUF_ZV (buf);
|
|
|
1479 }
|
|
|
1480
|
|
|
1481 if (start == -1)
|
|
|
1482 start = bmin;
|
|
|
1483 if (end == -1)
|
|
|
1484 end = bmax;
|
|
|
1485 assert (bmin <= start);
|
|
|
1486 assert (start <= bmax);
|
|
|
1487 if (reading)
|
|
|
1488 {
|
|
|
1489 assert (bmin <= end);
|
|
|
1490 assert (end <= bmax);
|
|
|
1491 assert (start <= end);
|
|
|
1492 }
|
|
|
1493
|
|
|
1494 lstr = Lstream_new (lstream_lisp_buffer, mode);
|
|
|
1495 str = LISP_BUFFER_STREAM_DATA (lstr);
|
|
|
1496 {
|
|
|
1497 Lisp_Object marker;
|
|
|
1498 Lisp_Object buffer;
|
|
|
1499
|
|
|
1500 XSETBUFFER (buffer, buf);
|
|
|
1501 marker = Fmake_marker ();
|
|
|
1502 Fset_marker (marker, make_int (start), buffer);
|
|
|
1503 str->start = marker;
|
|
|
1504 marker = Fmake_marker ();
|
|
|
1505 Fset_marker (marker, make_int (start), buffer);
|
|
|
1506 str->orig_start = marker;
|
|
|
1507 if (reading)
|
|
|
1508 {
|
|
|
1509 marker = Fmake_marker ();
|
|
|
1510 Fset_marker (marker, make_int (end), buffer);
|
|
|
1511 str->end = marker;
|
|
|
1512 }
|
|
|
1513 else
|
|
|
1514 str->end = Qnil;
|
|
|
1515 str->buffer = buffer;
|
|
|
1516 }
|
|
|
1517 str->flags = flags;
|
|
|
1518 XSETLSTREAM (obj, lstr);
|
|
|
1519 return obj;
|
|
|
1520 }
|
|
|
1521
|
|
|
1522 Lisp_Object
|
|
|
1523 make_lisp_buffer_input_stream (struct buffer *buf, Bufpos start, Bufpos end,
|
|
|
1524 int flags)
|
|
|
1525 {
|
|
|
1526 return make_lisp_buffer_stream_1 (buf, start, end, flags, "r");
|
|
|
1527 }
|
|
|
1528
|
|
|
1529 Lisp_Object
|
|
|
1530 make_lisp_buffer_output_stream (struct buffer *buf, Bufpos pos, int flags)
|
|
|
1531 {
|
|
|
1532 Lisp_Object lstr = make_lisp_buffer_stream_1 (buf, pos, 0, flags, "wc");
|
|
|
1533
|
|
|
1534 Lstream_set_character_mode (XLSTREAM (lstr));
|
|
|
1535 return lstr;
|
|
|
1536 }
|
|
|
1537
|
|
|
1538 static ssize_t
|
|
|
1539 lisp_buffer_reader (Lstream *stream, unsigned char *data, size_t size)
|
|
|
1540 {
|
|
|
1541 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream);
|
|
|
1542 unsigned char *orig_data = data;
|
|
|
1543 Bytind start;
|
|
|
1544 Bytind end;
|
|
|
1545 struct buffer *buf = XBUFFER (str->buffer);
|
|
|
1546
|
|
|
1547 if (!BUFFER_LIVE_P (buf))
|
|
|
1548 return 0; /* Fut. */
|
|
|
1549
|
|
|
1550 /* NOTE: We do all our operations in Bytind's.
|
|
|
1551 Keep in mind that SIZE is a value in bytes, not chars. */
|
|
|
1552
|
|
|
1553 start = bi_marker_position (str->start);
|
|
|
1554 end = bi_marker_position (str->end);
|
|
|
1555 if (!(str->flags & LSTR_IGNORE_ACCESSIBLE))
|
|
|
1556 {
|
|
|
1557 start = bytind_clip_to_bounds (BI_BUF_BEGV (buf), start,
|
|
|
1558 BI_BUF_ZV (buf));
|
|
|
1559 end = bytind_clip_to_bounds (BI_BUF_BEGV (buf), end,
|
|
|
1560 BI_BUF_ZV (buf));
|
|
|
1561 }
|
|
|
1562
|
|
|
1563 size = min (size, (size_t) (end - start));
|
|
|
1564 end = start + size;
|
|
|
1565 /* We cannot return a partial character. */
|
|
|
1566 VALIDATE_BYTIND_BACKWARD (buf, end);
|
|
|
1567
|
|
|
1568 while (start < end)
|
|
|
1569 {
|
|
|
1570 Bytind ceil;
|
|
|
1571 Bytecount chunk;
|
|
|
1572
|
|
|
1573 if (str->flags & LSTR_IGNORE_ACCESSIBLE)
|
|
|
1574 ceil = BI_BUF_CEILING_OF_IGNORE_ACCESSIBLE (buf, start);
|
|
|
1575 else
|
|
|
1576 ceil = BI_BUF_CEILING_OF (buf, start);
|
|
|
1577 chunk = min (ceil, end) - start;
|
|
|
1578 memcpy (data, BI_BUF_BYTE_ADDRESS (buf, start), chunk);
|
|
|
1579 data += chunk;
|
|
|
1580 start += chunk;
|
|
|
1581 }
|
|
|
1582
|
|
|
1583 if (EQ (buf->selective_display, Qt) && str->flags & LSTR_SELECTIVE)
|
|
|
1584 {
|
|
|
1585 /* What a kludge. What a kludge. What a kludge. */
|
|
|
1586 unsigned char *p;
|
|
|
1587 for (p = orig_data; p < data; p++)
|
|
|
1588 if (*p == '\r')
|
|
|
1589 *p = '\n';
|
|
|
1590 }
|
|
|
1591
|
|
|
1592 set_bi_marker_position (str->start, end);
|
|
|
1593 return data - orig_data;
|
|
|
1594 }
|
|
|
1595
|
|
|
1596 static ssize_t
|
|
442
|
1597 lisp_buffer_writer (Lstream *stream, const unsigned char *data, size_t size)
|
|
428
|
1598 {
|
|
|
1599 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream);
|
|
|
1600 Bufpos pos;
|
|
|
1601 struct buffer *buf = XBUFFER (str->buffer);
|
|
|
1602
|
|
|
1603 if (!BUFFER_LIVE_P (buf))
|
|
|
1604 return 0; /* Fut. */
|
|
|
1605
|
|
|
1606 pos = marker_position (str->start);
|
|
|
1607 pos += buffer_insert_raw_string_1 (buf, pos, data, size, 0);
|
|
|
1608 set_marker_position (str->start, pos);
|
|
|
1609 return size;
|
|
|
1610 }
|
|
|
1611
|
|
|
1612 static int
|
|
|
1613 lisp_buffer_rewinder (Lstream *stream)
|
|
|
1614 {
|
|
|
1615 struct lisp_buffer_stream *str =
|
|
|
1616 LISP_BUFFER_STREAM_DATA (stream);
|
|
|
1617 struct buffer *buf = XBUFFER (str->buffer);
|
|
|
1618 long pos = marker_position (str->orig_start);
|
|
|
1619 if (!BUFFER_LIVE_P (buf))
|
|
|
1620 return -1; /* Fut. */
|
|
|
1621 if (pos > BUF_ZV (buf))
|
|
|
1622 pos = BUF_ZV (buf);
|
|
|
1623 if (pos < marker_position (str->orig_start))
|
|
|
1624 pos = marker_position (str->orig_start);
|
|
|
1625 if (MARKERP (str->end) && pos > marker_position (str->end))
|
|
|
1626 pos = marker_position (str->end);
|
|
|
1627 set_marker_position (str->start, pos);
|
|
|
1628 return 0;
|
|
|
1629 }
|
|
|
1630
|
|
|
1631 static Lisp_Object
|
|
|
1632 lisp_buffer_marker (Lisp_Object stream)
|
|
|
1633 {
|
|
|
1634 struct lisp_buffer_stream *str =
|
|
|
1635 LISP_BUFFER_STREAM_DATA (XLSTREAM (stream));
|
|
|
1636
|
|
|
1637 mark_object (str->start);
|
|
|
1638 mark_object (str->end);
|
|
|
1639 return str->buffer;
|
|
|
1640 }
|
|
|
1641
|
|
|
1642 Bufpos
|
|
|
1643 lisp_buffer_stream_startpos (Lstream *stream)
|
|
|
1644 {
|
|
|
1645 return marker_position (LISP_BUFFER_STREAM_DATA (stream)->start);
|
|
|
1646 }
|
|
|
1647
|
|
|
1648
|
|
|
1649 /************************************************************************/
|
|
|
1650 /* initialization */
|
|
|
1651 /************************************************************************/
|
|
|
1652
|
|
|
1653 void
|
|
|
1654 lstream_type_create (void)
|
|
|
1655 {
|
|
|
1656 LSTREAM_HAS_METHOD (stdio, reader);
|
|
|
1657 LSTREAM_HAS_METHOD (stdio, writer);
|
|
|
1658 LSTREAM_HAS_METHOD (stdio, rewinder);
|
|
|
1659 LSTREAM_HAS_METHOD (stdio, seekable_p);
|
|
|
1660 LSTREAM_HAS_METHOD (stdio, flusher);
|
|
|
1661 LSTREAM_HAS_METHOD (stdio, closer);
|
|
|
1662
|
|
|
1663 LSTREAM_HAS_METHOD (filedesc, reader);
|
|
|
1664 LSTREAM_HAS_METHOD (filedesc, writer);
|
|
|
1665 LSTREAM_HAS_METHOD (filedesc, was_blocked_p);
|
|
|
1666 LSTREAM_HAS_METHOD (filedesc, rewinder);
|
|
|
1667 LSTREAM_HAS_METHOD (filedesc, seekable_p);
|
|
|
1668 LSTREAM_HAS_METHOD (filedesc, closer);
|
|
|
1669
|
|
|
1670 LSTREAM_HAS_METHOD (lisp_string, reader);
|
|
|
1671 LSTREAM_HAS_METHOD (lisp_string, rewinder);
|
|
|
1672 LSTREAM_HAS_METHOD (lisp_string, marker);
|
|
|
1673
|
|
|
1674 LSTREAM_HAS_METHOD (fixed_buffer, reader);
|
|
|
1675 LSTREAM_HAS_METHOD (fixed_buffer, writer);
|
|
|
1676 LSTREAM_HAS_METHOD (fixed_buffer, rewinder);
|
|
|
1677
|
|
|
1678 LSTREAM_HAS_METHOD (resizing_buffer, writer);
|
|
|
1679 LSTREAM_HAS_METHOD (resizing_buffer, rewinder);
|
|
|
1680 LSTREAM_HAS_METHOD (resizing_buffer, closer);
|
|
|
1681
|
|
|
1682 LSTREAM_HAS_METHOD (dynarr, writer);
|
|
|
1683 LSTREAM_HAS_METHOD (dynarr, rewinder);
|
|
|
1684 LSTREAM_HAS_METHOD (dynarr, closer);
|
|
|
1685
|
|
|
1686 LSTREAM_HAS_METHOD (lisp_buffer, reader);
|
|
|
1687 LSTREAM_HAS_METHOD (lisp_buffer, writer);
|
|
|
1688 LSTREAM_HAS_METHOD (lisp_buffer, rewinder);
|
|
|
1689 LSTREAM_HAS_METHOD (lisp_buffer, marker);
|
|
|
1690 }
|
|
|
1691
|
|
|
1692 void
|
|
|
1693 reinit_vars_of_lstream (void)
|
|
|
1694 {
|
|
|
1695 int i;
|
|
|
1696
|
|
|
1697 for (i = 0; i < countof (Vlstream_free_list); i++)
|
|
|
1698 {
|
|
|
1699 Vlstream_free_list[i] = Qnil;
|
|
|
1700 staticpro_nodump (&Vlstream_free_list[i]);
|
|
|
1701 }
|
|
|
1702 }
|
|
|
1703
|
|
|
1704 void
|
|
|
1705 vars_of_lstream (void)
|
|
|
1706 {
|
|
442
|
1707 INIT_LRECORD_IMPLEMENTATION (lstream);
|
|
|
1708
|
|
428
|
1709 reinit_vars_of_lstream ();
|
|
|
1710 }
|
