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