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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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444
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77 Read one byte from the stream and returns it as an unsigned
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78 char cast to an int, or EOF on end of file or error.
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79 This is a macro and so it is very efficient. The STREAM
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80 argument is evaluated more than once.
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428
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81
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82 void Lstream_ungetc (Lstream *stream, int c)
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444
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83 Push one byte back onto the input queue, cast to unsigned char.
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84 This will be the next byte read from the stream. Any number
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85 of bytes can be pushed back and will be read in the reverse
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86 order they were pushed back -- most recent first. (This is
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87 necessary for consistency -- if there are a number of bytes
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88 that have been unread and I read and unread a byte, it needs
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89 to be the first to be read again.) This is a macro and so it
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90 is very efficient. The C argument is only evaluated once but
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91 the STREAM argument is evaluated more than once.
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428
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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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456
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182 inline static size_t
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183 aligned_sizeof_lstream (size_t lstream_type_specific_size)
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184 {
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185 return ALIGN_SIZE (offsetof (Lstream, data) + lstream_type_specific_size,
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186 ALIGNOF (max_align_t));
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187 }
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188
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428
|
189 static size_t
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442
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190 sizeof_lstream (const void *header)
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428
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191 {
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456
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192 return aligned_sizeof_lstream (((const Lstream *) header)->imp->size);
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428
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193 }
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194
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195 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION ("stream", lstream,
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196 mark_lstream, print_lstream,
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197 finalize_lstream, 0, 0, 0,
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198 sizeof_lstream, Lstream);
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199
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200 void
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201 Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering,
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202 int buffering_size)
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203 {
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204 lstr->buffering = buffering;
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205 switch (buffering)
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206 {
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207 case LSTREAM_UNBUFFERED:
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208 lstr->buffering_size = 0; break;
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209 case LSTREAM_BLOCK_BUFFERED:
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210 lstr->buffering_size = DEFAULT_BLOCK_BUFFERING_SIZE; break;
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211 case LSTREAM_BLOCKN_BUFFERED:
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212 lstr->buffering_size = buffering_size; break;
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213 case LSTREAM_LINE_BUFFERED:
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214 case LSTREAM_UNLIMITED:
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215 lstr->buffering_size = INT_MAX; break;
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216 }
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|
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217 }
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218
|
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442
|
219 static const Lstream_implementation *lstream_types[32];
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428
|
220 static Lisp_Object Vlstream_free_list[32];
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221 static int lstream_type_count;
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222
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223 Lstream *
|
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442
|
224 Lstream_new (const Lstream_implementation *imp, const char *mode)
|
|
428
|
225 {
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|
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226 Lstream *p;
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227 int i;
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228
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229 for (i = 0; i < lstream_type_count; i++)
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230 {
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231 if (lstream_types[i] == imp)
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232 break;
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233 }
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234
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|
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235 if (i == lstream_type_count)
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|
|
236 {
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|
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237 assert (lstream_type_count < countof (lstream_types));
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238 lstream_types[lstream_type_count] = imp;
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239 Vlstream_free_list[lstream_type_count] =
|
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456
|
240 make_lcrecord_list (aligned_sizeof_lstream (imp->size),
|
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428
|
241 &lrecord_lstream);
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|
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242 lstream_type_count++;
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|
|
243 }
|
|
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244
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|
|
245 p = XLSTREAM (allocate_managed_lcrecord (Vlstream_free_list[i]));
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|
|
246 /* Zero it out, except the header. */
|
|
456
|
247 memset ((char *) p + sizeof (p->header), '\0',
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|
|
248 aligned_sizeof_lstream (imp->size) - sizeof (p->header));
|
|
428
|
249 p->imp = imp;
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|
|
250 Lstream_set_buffering (p, LSTREAM_BLOCK_BUFFERED, 0);
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251 p->flags = LSTREAM_FL_IS_OPEN;
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252
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|
|
253 /* convert mode (one of "r", "w", "rc", "wc") to p->flags */
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|
254 assert (mode[0] == 'r' || mode[0] == 'w');
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255 assert (mode[1] == 'c' || mode[1] == '\0');
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|
|
256 p->flags |= (mode[0] == 'r' ? LSTREAM_FL_READ : LSTREAM_FL_WRITE);
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|
|
257 if (mode[1] == 'c')
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|
258 p->flags |= LSTREAM_FL_NO_PARTIAL_CHARS;
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|
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259
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|
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260 return p;
|
|
|
261 }
|
|
|
262
|
|
|
263 void
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|
|
264 Lstream_set_character_mode (Lstream *lstr)
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|
|
265 {
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|
|
266 lstr->flags |= LSTREAM_FL_NO_PARTIAL_CHARS;
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|
|
267 }
|
|
|
268
|
|
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269 void
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|
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270 Lstream_delete (Lstream *lstr)
|
|
|
271 {
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|
|
272 int i;
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|
|
273 Lisp_Object val;
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274
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|
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275 XSETLSTREAM (val, lstr);
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|
276 for (i = 0; i < lstream_type_count; i++)
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|
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277 {
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|
|
278 if (lstream_types[i] == lstr->imp)
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|
|
279 {
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|
|
280 free_managed_lcrecord (Vlstream_free_list[i], val);
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|
281 return;
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|
|
282 }
|
|
|
283 }
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|
|
284
|
|
|
285 abort ();
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|
|
286 }
|
|
|
287
|
|
|
288 #define Lstream_internal_error(reason, lstr) \
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|
|
289 Lstream_signal_simple_error ("Internal error: " reason, lstr)
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|
|
290
|
|
442
|
291 static void Lstream_signal_simple_error (const char *reason, Lstream *lstr)
|
|
428
|
292 {
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|
|
293 Lisp_Object obj;
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|
|
294 XSETLSTREAM (obj, lstr);
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|
|
295 signal_simple_error (reason, obj);
|
|
|
296 }
|
|
|
297
|
|
|
298 void
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|
|
299 Lstream_reopen (Lstream *lstr)
|
|
|
300 {
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|
|
301 if (lstr->flags & LSTREAM_FL_IS_OPEN)
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|
|
302 Lstream_internal_error ("lstream already open", lstr);
|
|
|
303 lstr->flags |= LSTREAM_FL_IS_OPEN;
|
|
|
304 }
|
|
|
305
|
|
|
306 /* Attempt to flush out all of the buffered data for writing. */
|
|
|
307
|
|
|
308 int
|
|
|
309 Lstream_flush_out (Lstream *lstr)
|
|
|
310 {
|
|
|
311 ssize_t num_written;
|
|
|
312
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|
|
313 while (lstr->out_buffer_ind > 0)
|
|
|
314 {
|
|
|
315 size_t size = lstr->out_buffer_ind;
|
|
|
316 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
|
317 Lstream_internal_error ("lstream not open", lstr);
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|
|
318 if (! (lstr->flags & LSTREAM_FL_WRITE))
|
|
|
319 Lstream_internal_error ("lstream not open for writing", lstr);
|
|
|
320 if (!lstr->imp->writer)
|
|
|
321 Lstream_internal_error ("lstream has no writer", lstr);
|
|
|
322
|
|
|
323 if (lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS)
|
|
|
324 /* It's quite possible for us to get passed an incomplete
|
|
|
325 character at the end. We need to spit back that
|
|
|
326 incomplete character. */
|
|
|
327 {
|
|
442
|
328 const unsigned char *data = lstr->out_buffer;
|
|
|
329 const unsigned char *dataend = data + size - 1;
|
|
428
|
330 assert (size > 0); /* safety check ... */
|
|
|
331 /* Optimize the most common case. */
|
|
|
332 if (!BYTE_ASCII_P (*dataend))
|
|
|
333 {
|
|
|
334 /* Go back to the beginning of the last (and possibly partial)
|
|
|
335 character, and bump forward to see if the character is
|
|
|
336 complete. */
|
|
|
337 VALIDATE_CHARPTR_BACKWARD (dataend);
|
|
|
338 if (dataend + REP_BYTES_BY_FIRST_BYTE (*dataend) != data + size)
|
|
|
339 /* If not, chop the size down to ignore the last char
|
|
|
340 and stash it away for next time. */
|
|
|
341 size = dataend - data;
|
|
|
342 /* If we don't even have one character to write, then just
|
|
|
343 skip out. */
|
|
|
344 if (size == 0)
|
|
|
345 break;
|
|
|
346 }
|
|
|
347 }
|
|
|
348
|
|
|
349 num_written = (lstr->imp->writer) (lstr, lstr->out_buffer, size);
|
|
|
350 if (num_written == 0)
|
|
|
351 /* If nothing got written, then just hold the data. This may
|
|
|
352 occur, for example, if this stream does non-blocking I/O;
|
|
|
353 the attempt to write the data might have resulted in an
|
|
|
354 EWOULDBLOCK error. */
|
|
|
355 return 0;
|
|
|
356 else if (num_written >= lstr->out_buffer_ind)
|
|
|
357 lstr->out_buffer_ind = 0;
|
|
|
358 else if (num_written > 0)
|
|
|
359 {
|
|
|
360 memmove (lstr->out_buffer, lstr->out_buffer + num_written,
|
|
|
361 lstr->out_buffer_ind - num_written);
|
|
|
362 lstr->out_buffer_ind -= num_written;
|
|
|
363 }
|
|
|
364 else
|
|
|
365 /* If error, just hold the data, for similar reasons as above. */
|
|
|
366 return -1;
|
|
|
367 }
|
|
|
368
|
|
|
369 if (lstr->imp->flusher)
|
|
|
370 return (lstr->imp->flusher) (lstr);
|
|
|
371
|
|
|
372 return 0;
|
|
|
373 }
|
|
|
374
|
|
|
375 int
|
|
|
376 Lstream_flush (Lstream *lstr)
|
|
|
377 {
|
|
|
378 if (Lstream_flush_out (lstr) < 0)
|
|
|
379 return -1;
|
|
|
380
|
|
|
381 /* clear out buffered data */
|
|
|
382 lstr->in_buffer_current = lstr->in_buffer_ind = 0;
|
|
|
383 lstr->unget_buffer_ind = 0;
|
|
|
384
|
|
|
385 return 0;
|
|
|
386 }
|
|
|
387
|
|
|
388 /* We want to add NUM characters. This function ensures that the
|
|
|
389 buffer is large enough for this (per the buffering size specified
|
|
|
390 in the stream) and returns the number of characters we can
|
|
|
391 actually write. If FORCE is set, ignore the buffering size
|
|
|
392 and go ahead and make space for all the chars even if it exceeds
|
|
|
393 the buffering size. (This is used to deal with the possibility
|
|
|
394 that the stream writer might refuse to write any bytes now, e.g.
|
|
|
395 if it's getting EWOULDBLOCK errors. We have to keep stocking them
|
|
|
396 up until they can be written, so as to avoid losing data. */
|
|
|
397
|
|
|
398 static size_t
|
|
|
399 Lstream_adding (Lstream *lstr, size_t num, int force)
|
|
|
400 {
|
|
430
|
401 size_t size = num + lstr->out_buffer_ind;
|
|
|
402
|
|
|
403 if (size <= lstr->out_buffer_size)
|
|
|
404 return num;
|
|
|
405
|
|
428
|
406 /* Maybe chop it down so that we don't buffer more characters
|
|
|
407 than our advertised buffering size. */
|
|
430
|
408 if ((size > lstr->buffering_size) && !force)
|
|
|
409 {
|
|
|
410 size = lstr->buffering_size;
|
|
|
411 /* There might be more data buffered than the buffering size. */
|
|
|
412 if (size <= lstr->out_buffer_ind)
|
|
|
413 return 0;
|
|
|
414 }
|
|
|
415
|
|
|
416 DO_REALLOC (lstr->out_buffer, lstr->out_buffer_size, size, unsigned char);
|
|
|
417
|
|
|
418 return size - lstr->out_buffer_ind;
|
|
428
|
419 }
|
|
|
420
|
|
|
421 /* Like Lstream_write(), but does not handle line-buffering correctly. */
|
|
|
422
|
|
|
423 static ssize_t
|
|
442
|
424 Lstream_write_1 (Lstream *lstr, const void *data, size_t size)
|
|
428
|
425 {
|
|
442
|
426 const unsigned char *p = (const unsigned char *) data;
|
|
428
|
427 ssize_t off = 0;
|
|
|
428 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
|
429 Lstream_internal_error ("lstream not open", lstr);
|
|
|
430 if (! (lstr->flags & LSTREAM_FL_WRITE))
|
|
|
431 Lstream_internal_error ("lstream not open for writing", lstr);
|
|
|
432 {
|
|
|
433 int couldnt_write_last_time = 0;
|
|
|
434
|
|
|
435 while (1)
|
|
|
436 {
|
|
|
437 /* Figure out how much we can add to the buffer */
|
|
|
438 size_t chunk = Lstream_adding (lstr, size, 0);
|
|
|
439 if (chunk == 0)
|
|
|
440 {
|
|
|
441 if (couldnt_write_last_time)
|
|
|
442 /* Ung, we ran out of space and tried to flush
|
|
|
443 the buffer, but it didn't work because the stream
|
|
|
444 writer is refusing to accept any data. So we
|
|
|
445 just have to squirrel away all the rest of the
|
|
|
446 stuff. */
|
|
|
447 chunk = Lstream_adding (lstr, size, 1);
|
|
|
448 else
|
|
|
449 couldnt_write_last_time = 1;
|
|
|
450 }
|
|
|
451 /* Do it. */
|
|
|
452 if (chunk > 0)
|
|
|
453 {
|
|
|
454 memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off, chunk);
|
|
|
455 lstr->out_buffer_ind += chunk;
|
|
|
456 lstr->byte_count += chunk;
|
|
|
457 size -= chunk;
|
|
|
458 off += chunk;
|
|
|
459 }
|
|
|
460 /* If the buffer is full and we have more to add, flush it out. */
|
|
|
461 if (size > 0)
|
|
|
462 {
|
|
|
463 if (Lstream_flush_out (lstr) < 0)
|
|
|
464 {
|
|
|
465 if (off == 0)
|
|
|
466 return -1;
|
|
|
467 else
|
|
|
468 return off;
|
|
|
469 }
|
|
|
470 }
|
|
|
471 else
|
|
|
472 break;
|
|
|
473 }
|
|
|
474 }
|
|
|
475 return off;
|
|
|
476 }
|
|
|
477
|
|
|
478 /* If the stream is not line-buffered, then we can just call
|
|
|
479 Lstream_write_1(), which writes in chunks. Otherwise, we
|
|
|
480 repeatedly call Lstream_putc(), which knows how to handle
|
|
440
|
481 line buffering. Returns number of bytes written. */
|
|
428
|
482
|
|
|
483 ssize_t
|
|
442
|
484 Lstream_write (Lstream *lstr, const void *data, size_t size)
|
|
428
|
485 {
|
|
|
486 size_t i;
|
|
442
|
487 const unsigned char *p = (const unsigned char *) data;
|
|
428
|
488
|
|
|
489 if (size == 0)
|
|
|
490 return size;
|
|
|
491 if (lstr->buffering != LSTREAM_LINE_BUFFERED)
|
|
|
492 return Lstream_write_1 (lstr, data, size);
|
|
|
493 for (i = 0; i < size; i++)
|
|
|
494 {
|
|
|
495 if (Lstream_putc (lstr, p[i]) < 0)
|
|
|
496 break;
|
|
|
497 }
|
|
440
|
498 return i == 0 ? -1 : (ssize_t) i;
|
|
428
|
499 }
|
|
|
500
|
|
|
501 int
|
|
|
502 Lstream_was_blocked_p (Lstream *lstr)
|
|
|
503 {
|
|
|
504 return lstr->imp->was_blocked_p ? lstr->imp->was_blocked_p (lstr) : 0;
|
|
|
505 }
|
|
|
506
|
|
444
|
507 static ssize_t
|
|
428
|
508 Lstream_raw_read (Lstream *lstr, unsigned char *buffer, size_t size)
|
|
|
509 {
|
|
|
510 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
|
511 Lstream_internal_error ("lstream not open", lstr);
|
|
|
512 if (! (lstr->flags & LSTREAM_FL_READ))
|
|
|
513 Lstream_internal_error ("lstream not open for reading", lstr);
|
|
|
514 if (!lstr->imp->reader)
|
|
|
515 Lstream_internal_error ("lstream has no reader", lstr);
|
|
|
516
|
|
|
517 return (lstr->imp->reader) (lstr, buffer, size);
|
|
|
518 }
|
|
|
519
|
|
|
520 /* Assuming the buffer is empty, fill it up again. */
|
|
|
521
|
|
|
522 static ssize_t
|
|
|
523 Lstream_read_more (Lstream *lstr)
|
|
|
524 {
|
|
|
525 #if 0
|
|
|
526 ssize_t size_needed = max (1, min (MAX_READ_SIZE, lstr->buffering_size));
|
|
|
527 #else
|
|
|
528 /* If someone requested a larger buffer size, so be it! */
|
|
|
529 ssize_t size_needed = max (1, lstr->buffering_size);
|
|
|
530 #endif
|
|
|
531 ssize_t size_gotten;
|
|
|
532
|
|
|
533 DO_REALLOC (lstr->in_buffer, lstr->in_buffer_size,
|
|
|
534 size_needed, unsigned char);
|
|
|
535 size_gotten = Lstream_raw_read (lstr, lstr->in_buffer, size_needed);
|
|
|
536 lstr->in_buffer_current = max (0, size_gotten);
|
|
|
537 lstr->in_buffer_ind = 0;
|
|
|
538 return size_gotten < 0 ? -1 : size_gotten;
|
|
|
539 }
|
|
|
540
|
|
|
541 ssize_t
|
|
|
542 Lstream_read (Lstream *lstr, void *data, size_t size)
|
|
|
543 {
|
|
|
544 unsigned char *p = (unsigned char *) data;
|
|
|
545 size_t off = 0;
|
|
|
546 size_t chunk;
|
|
|
547 int error_occurred = 0;
|
|
|
548
|
|
|
549 if (size == 0)
|
|
|
550 return 0;
|
|
|
551
|
|
|
552 /* First try to get some data from the unget buffer */
|
|
|
553 chunk = min (size, lstr->unget_buffer_ind);
|
|
|
554 if (chunk > 0)
|
|
|
555 {
|
|
|
556 /* The bytes come back in reverse order. */
|
|
|
557 for (; off < chunk; off++)
|
|
|
558 p[off] = lstr->unget_buffer[--lstr->unget_buffer_ind];
|
|
|
559 lstr->byte_count += chunk;
|
|
|
560 size -= chunk;
|
|
|
561 }
|
|
|
562
|
|
|
563 while (size > 0)
|
|
|
564 {
|
|
|
565 /* Take whatever we can from the in buffer */
|
|
|
566 chunk = min (size, lstr->in_buffer_current - lstr->in_buffer_ind);
|
|
|
567 if (chunk > 0)
|
|
|
568 {
|
|
|
569 memcpy (p + off, lstr->in_buffer + lstr->in_buffer_ind, chunk);
|
|
|
570 lstr->in_buffer_ind += chunk;
|
|
|
571 lstr->byte_count += chunk;
|
|
|
572 size -= chunk;
|
|
|
573 off += chunk;
|
|
|
574 }
|
|
|
575
|
|
|
576 /* If we need some more, try to get some more from the stream's end */
|
|
|
577 if (size > 0)
|
|
|
578 {
|
|
|
579 ssize_t retval = Lstream_read_more (lstr);
|
|
|
580 if (retval < 0)
|
|
|
581 error_occurred = 1;
|
|
|
582 if (retval <= 0)
|
|
|
583 break;
|
|
|
584 }
|
|
|
585 }
|
|
|
586
|
|
|
587 /* #### Beware of OFF ending up 0. */
|
|
|
588 if ((lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS) && off > 0)
|
|
|
589 {
|
|
|
590 /* It's quite possible for us to get passed an incomplete
|
|
|
591 character at the end. We need to spit back that
|
|
|
592 incomplete character. */
|
|
442
|
593 const unsigned char *dataend = p + off - 1;
|
|
428
|
594 /* Optimize the most common case. */
|
|
|
595 if (!BYTE_ASCII_P (*dataend))
|
|
|
596 {
|
|
|
597 /* Go back to the beginning of the last (and possibly partial)
|
|
|
598 character, and bump forward to see if the character is
|
|
|
599 complete. */
|
|
|
600 VALIDATE_CHARPTR_BACKWARD (dataend);
|
|
|
601 if (dataend + REP_BYTES_BY_FIRST_BYTE (*dataend) != p + off)
|
|
|
602 {
|
|
|
603 size_t newoff = dataend - p;
|
|
|
604 /* If not, chop the size down to ignore the last char
|
|
|
605 and stash it away for next time. */
|
|
|
606 Lstream_unread (lstr, dataend, off - newoff);
|
|
|
607 off = newoff;
|
|
|
608 }
|
|
|
609 }
|
|
|
610 }
|
|
|
611
|
|
|
612 return off == 0 && error_occurred ? -1 : (ssize_t) off;
|
|
|
613 }
|
|
|
614
|
|
|
615 void
|
|
442
|
616 Lstream_unread (Lstream *lstr, const void *data, size_t size)
|
|
428
|
617 {
|
|
442
|
618 const unsigned char *p = (const unsigned char *) data;
|
|
428
|
619
|
|
|
620 /* Make sure buffer is big enough */
|
|
|
621 DO_REALLOC (lstr->unget_buffer, lstr->unget_buffer_size,
|
|
|
622 lstr->unget_buffer_ind + size, unsigned char);
|
|
|
623
|
|
|
624 lstr->byte_count -= size;
|
|
|
625
|
|
|
626 /* Bytes have to go on in reverse order -- they are reversed
|
|
|
627 again when read back. */
|
|
|
628 while (size--)
|
|
|
629 lstr->unget_buffer[lstr->unget_buffer_ind++] = p[size];
|
|
|
630 }
|
|
|
631
|
|
|
632 int
|
|
|
633 Lstream_rewind (Lstream *lstr)
|
|
|
634 {
|
|
|
635 if (!lstr->imp->rewinder)
|
|
|
636 Lstream_internal_error ("lstream has no rewinder", lstr);
|
|
|
637 if (Lstream_flush (lstr) < 0)
|
|
|
638 return -1;
|
|
|
639 lstr->byte_count = 0;
|
|
|
640 return (lstr->imp->rewinder) (lstr);
|
|
|
641 }
|
|
|
642
|
|
|
643 int
|
|
|
644 Lstream_seekable_p (Lstream *lstr)
|
|
|
645 {
|
|
|
646 if (!lstr->imp->rewinder)
|
|
|
647 return 0;
|
|
|
648 if (!lstr->imp->seekable_p)
|
|
|
649 return 1;
|
|
|
650 return (lstr->imp->seekable_p) (lstr);
|
|
|
651 }
|
|
|
652
|
|
|
653 static int
|
|
|
654 Lstream_pseudo_close (Lstream *lstr)
|
|
|
655 {
|
|
|
656 if (!lstr->flags & LSTREAM_FL_IS_OPEN)
|
|
|
657 Lstream_internal_error ("lstream is not open", lstr);
|
|
|
658
|
|
|
659 /* don't check errors here -- best not to risk file descriptor loss */
|
|
|
660 return Lstream_flush (lstr);
|
|
|
661 }
|
|
|
662
|
|
|
663 int
|
|
|
664 Lstream_close (Lstream *lstr)
|
|
|
665 {
|
|
|
666 int rc = 0;
|
|
|
667
|
|
|
668 if (lstr->flags & LSTREAM_FL_IS_OPEN)
|
|
|
669 {
|
|
|
670 rc = Lstream_pseudo_close (lstr);
|
|
|
671 /*
|
|
|
672 * We used to return immediately if the closer method reported
|
|
|
673 * failure, leaving the stream open. But this is no good, for
|
|
|
674 * the following reasons.
|
|
|
675 *
|
|
|
676 * 1. The finalizer method used in GC makes no provision for
|
|
|
677 * failure, so we must not return without freeing buffer
|
|
|
678 * memory.
|
|
|
679 *
|
|
|
680 * 2. The closer method may have already freed some memory
|
|
|
681 * used for I/O in this stream. E.g. encoding_closer frees
|
|
|
682 * ENCODING_STREAM_DATA(stream)->runoff. If a writer method
|
|
|
683 * tries to use this buffer later, it will write into memory
|
|
|
684 * that may have been allocated elsewhere. Sometime later
|
|
|
685 * you will see a sign that says "Welcome to Crash City."
|
|
|
686 *
|
|
|
687 * 3. The closer can report failure if a flush fails in the
|
|
|
688 * other stream in a MULE encoding/decoding stream pair.
|
|
|
689 * The other stream in the pair is closed, but returning
|
|
|
690 * early leaves the current stream open. If we try to
|
|
|
691 * flush the current stream later, we will crash when the
|
|
|
692 * flusher notices that the other end stream is closed.
|
|
|
693 *
|
|
|
694 * So, we no longer abort the close if the closer method
|
|
|
695 * reports some kind of failure. We still report the failure
|
|
|
696 * to the caller.
|
|
|
697 */
|
|
|
698 if (lstr->imp->closer)
|
|
|
699 if ((lstr->imp->closer) (lstr) < 0)
|
|
|
700 rc = -1;
|
|
|
701 }
|
|
|
702
|
|
|
703 lstr->flags &= ~LSTREAM_FL_IS_OPEN;
|
|
|
704 lstr->byte_count = 0;
|
|
|
705 /* Note that Lstream_flush() reset all the buffer indices. That way,
|
|
|
706 the next call to Lstream_putc(), Lstream_getc(), or Lstream_ungetc()
|
|
|
707 on a closed stream will call into the function equivalents, which will
|
|
|
708 cause an error. */
|
|
|
709
|
|
|
710 /* We set the pointers to 0 so that we don't lose when this function
|
|
|
711 is called more than once on the same object */
|
|
|
712 if (lstr->out_buffer)
|
|
|
713 {
|
|
|
714 xfree (lstr->out_buffer);
|
|
|
715 lstr->out_buffer = 0;
|
|
|
716 }
|
|
|
717 if (lstr->in_buffer)
|
|
|
718 {
|
|
|
719 xfree (lstr->in_buffer);
|
|
|
720 lstr->in_buffer = 0;
|
|
|
721 }
|
|
|
722 if (lstr->unget_buffer)
|
|
|
723 {
|
|
|
724 xfree (lstr->unget_buffer);
|
|
|
725 lstr->unget_buffer = 0;
|
|
|
726 }
|
|
|
727
|
|
|
728 return rc;
|
|
|
729 }
|
|
|
730
|
|
|
731 int
|
|
|
732 Lstream_fputc (Lstream *lstr, int c)
|
|
|
733 {
|
|
|
734 unsigned char ch = (unsigned char) c;
|
|
|
735 ssize_t retval = Lstream_write_1 (lstr, &ch, 1);
|
|
|
736 if (retval >= 0 && lstr->buffering == LSTREAM_LINE_BUFFERED && ch == '\n')
|
|
|
737 return Lstream_flush_out (lstr);
|
|
|
738 return retval < 0 ? -1 : 0;
|
|
|
739 }
|
|
|
740
|
|
|
741 int
|
|
|
742 Lstream_fgetc (Lstream *lstr)
|
|
|
743 {
|
|
|
744 unsigned char ch;
|
|
|
745 if (Lstream_read (lstr, &ch, 1) <= 0)
|
|
|
746 return -1;
|
|
|
747 return ch;
|
|
|
748 }
|
|
|
749
|
|
|
750 void
|
|
|
751 Lstream_fungetc (Lstream *lstr, int c)
|
|
|
752 {
|
|
|
753 unsigned char ch = (unsigned char) c;
|
|
|
754 Lstream_unread (lstr, &ch, 1);
|
|
|
755 }
|
|
|
756
|
|
|
757
|
|
|
758 /************************ some stream implementations *********************/
|
|
|
759
|
|
|
760 /*********** a stdio stream ***********/
|
|
|
761
|
|
|
762 struct stdio_stream
|
|
|
763 {
|
|
|
764 FILE *file;
|
|
|
765 int closing;
|
|
|
766 };
|
|
|
767
|
|
|
768 #define STDIO_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, stdio)
|
|
|
769
|
|
|
770 DEFINE_LSTREAM_IMPLEMENTATION ("stdio", lstream_stdio,
|
|
|
771 sizeof (struct stdio_stream));
|
|
|
772
|
|
|
773 static Lisp_Object
|
|
442
|
774 make_stdio_stream_1 (FILE *stream, int flags, const char *mode)
|
|
428
|
775 {
|
|
|
776 Lisp_Object obj;
|
|
|
777 Lstream *lstr = Lstream_new (lstream_stdio, mode);
|
|
|
778 struct stdio_stream *str = STDIO_STREAM_DATA (lstr);
|
|
|
779 str->file = stream;
|
|
|
780 str->closing = flags & LSTR_CLOSING;
|
|
|
781 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE;
|
|
|
782 XSETLSTREAM (obj, lstr);
|
|
|
783 return obj;
|
|
|
784 }
|
|
|
785
|
|
|
786 Lisp_Object
|
|
|
787 make_stdio_input_stream (FILE *stream, int flags)
|
|
|
788 {
|
|
|
789 return make_stdio_stream_1 (stream, flags, "r");
|
|
|
790 }
|
|
|
791
|
|
|
792 Lisp_Object
|
|
|
793 make_stdio_output_stream (FILE *stream, int flags)
|
|
|
794 {
|
|
|
795 return make_stdio_stream_1 (stream, flags, "w");
|
|
|
796 }
|
|
|
797
|
|
|
798 /* #### From reading the Unix 98 specification, it appears that if we
|
|
|
799 want stdio_reader() to be completely correct, we should check for
|
|
|
800 0 < val < size and if so, check to see if an error has occurred.
|
|
|
801 If an error has occurred, but val is non-zero, we should go ahead
|
|
|
802 and act as if the read was successful, but remember in some fashion
|
|
|
803 or other, that an error has occurred, and report that on the next
|
|
|
804 call to stdio_reader instead of calling fread() again.
|
|
|
805
|
|
|
806 Currently, in such a case, we end up calling fread() twice and we
|
|
|
807 assume that
|
|
|
808
|
|
|
809 1) this is not harmful, and
|
|
|
810 2) the error will still be reported on the second read.
|
|
|
811
|
|
|
812 This is probably reasonable, so I don't think we should change this
|
|
|
813 code (it could even be argued that the error might have fixed
|
|
|
814 itself, so we should do the fread() again. */
|
|
|
815
|
|
|
816 static ssize_t
|
|
|
817 stdio_reader (Lstream *stream, unsigned char *data, size_t size)
|
|
|
818 {
|
|
|
819 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
820 size_t val = fread (data, 1, size, str->file);
|
|
|
821 if (!val && ferror (str->file))
|
|
|
822 return -1;
|
|
|
823 return val;
|
|
|
824 }
|
|
|
825
|
|
|
826 static ssize_t
|
|
442
|
827 stdio_writer (Lstream *stream, const unsigned char *data, size_t size)
|
|
428
|
828 {
|
|
|
829 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
830 size_t val = fwrite (data, 1, size, str->file);
|
|
|
831 if (!val && ferror (str->file))
|
|
|
832 return -1;
|
|
|
833 return val;
|
|
|
834 }
|
|
|
835
|
|
|
836 static int
|
|
|
837 stdio_rewinder (Lstream *stream)
|
|
|
838 {
|
|
|
839 rewind (STDIO_STREAM_DATA (stream)->file);
|
|
|
840 return 0;
|
|
|
841 }
|
|
|
842
|
|
|
843 static int
|
|
|
844 stdio_seekable_p (Lstream *stream)
|
|
|
845 {
|
|
|
846 struct stat lestat;
|
|
|
847 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
848
|
|
|
849 if (fstat (fileno (str->file), &lestat) < 0)
|
|
|
850 return 0;
|
|
|
851 return S_ISREG (lestat.st_mode);
|
|
|
852 }
|
|
|
853
|
|
|
854 static int
|
|
|
855 stdio_flusher (Lstream *stream)
|
|
|
856 {
|
|
|
857 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
858 if (stream->flags & LSTREAM_FL_WRITE)
|
|
|
859 return fflush (str->file);
|
|
|
860 else
|
|
|
861 return 0;
|
|
|
862 }
|
|
|
863
|
|
|
864 static int
|
|
|
865 stdio_closer (Lstream *stream)
|
|
|
866 {
|
|
|
867 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
868 if (str->closing)
|
|
|
869 return fclose (str->file);
|
|
|
870 else
|
|
|
871 if (stream->flags & LSTREAM_FL_WRITE)
|
|
|
872 return fflush (str->file);
|
|
|
873 else
|
|
|
874 return 0;
|
|
|
875 }
|
|
|
876
|
|
|
877 /*********** a file descriptor ***********/
|
|
|
878
|
|
|
879 struct filedesc_stream
|
|
|
880 {
|
|
|
881 int fd;
|
|
|
882 int pty_max_bytes;
|
|
|
883 Bufbyte eof_char;
|
|
|
884 int starting_pos;
|
|
|
885 int current_pos;
|
|
|
886 int end_pos;
|
|
|
887 int chars_sans_newline;
|
|
|
888 unsigned int closing :1;
|
|
|
889 unsigned int allow_quit :1;
|
|
|
890 unsigned int blocked_ok :1;
|
|
|
891 unsigned int pty_flushing :1;
|
|
|
892 unsigned int blocking_error_p :1;
|
|
|
893 };
|
|
|
894
|
|
|
895 #define FILEDESC_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, filedesc)
|
|
|
896
|
|
|
897 DEFINE_LSTREAM_IMPLEMENTATION ("filedesc", lstream_filedesc,
|
|
|
898 sizeof (struct filedesc_stream));
|
|
|
899
|
|
|
900 /* Make a stream that reads from or writes to a file descriptor FILEDESC.
|
|
|
901 OFFSET is the offset from the *current* file pointer that the reading
|
|
|
902 should start at. COUNT is the number of bytes to be read (it is
|
|
|
903 ignored when writing); -1 for unlimited. */
|
|
|
904 static Lisp_Object
|
|
|
905 make_filedesc_stream_1 (int filedesc, int offset, int count, int flags,
|
|
442
|
906 const char *mode)
|
|
428
|
907 {
|
|
|
908 Lisp_Object obj;
|
|
|
909 Lstream *lstr = Lstream_new (lstream_filedesc, mode);
|
|
|
910 struct filedesc_stream *fstr = FILEDESC_STREAM_DATA (lstr);
|
|
|
911 fstr->fd = filedesc;
|
|
|
912 fstr->closing = !!(flags & LSTR_CLOSING);
|
|
|
913 fstr->allow_quit = !!(flags & LSTR_ALLOW_QUIT);
|
|
|
914 fstr->blocked_ok = !!(flags & LSTR_BLOCKED_OK);
|
|
|
915 fstr->pty_flushing = !!(flags & LSTR_PTY_FLUSHING);
|
|
|
916 fstr->blocking_error_p = 0;
|
|
|
917 fstr->chars_sans_newline = 0;
|
|
|
918 fstr->starting_pos = lseek (filedesc, offset, SEEK_CUR);
|
|
|
919 fstr->current_pos = max (fstr->starting_pos, 0);
|
|
|
920 if (count < 0)
|
|
|
921 fstr->end_pos = -1;
|
|
|
922 else
|
|
|
923 fstr->end_pos = fstr->starting_pos + count;
|
|
|
924 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE;
|
|
|
925 XSETLSTREAM (obj, lstr);
|
|
|
926 return obj;
|
|
|
927 }
|
|
|
928
|
|
|
929 Lisp_Object
|
|
|
930 make_filedesc_input_stream (int filedesc, int offset, int count, int flags)
|
|
|
931 {
|
|
|
932 return make_filedesc_stream_1 (filedesc, offset, count, flags, "r");
|
|
|
933 }
|
|
|
934
|
|
|
935 Lisp_Object
|
|
|
936 make_filedesc_output_stream (int filedesc, int offset, int count, int flags)
|
|
|
937 {
|
|
|
938 return make_filedesc_stream_1 (filedesc, offset, count, flags, "w");
|
|
|
939 }
|
|
|
940
|
|
|
941 static ssize_t
|
|
|
942 filedesc_reader (Lstream *stream, unsigned char *data, size_t size)
|
|
|
943 {
|
|
|
944 ssize_t nread;
|
|
|
945 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
946 if (str->end_pos >= 0)
|
|
|
947 size = min (size, (size_t) (str->end_pos - str->current_pos));
|
|
430
|
948 nread = str->allow_quit ?
|
|
|
949 read_allowing_quit (str->fd, data, size) :
|
|
|
950 read (str->fd, data, size);
|
|
428
|
951 if (nread > 0)
|
|
|
952 str->current_pos += nread;
|
|
|
953 return nread;
|
|
|
954 }
|
|
|
955
|
|
|
956 static int
|
|
|
957 errno_would_block_p (int val)
|
|
|
958 {
|
|
|
959 #ifdef EWOULDBLOCK
|
|
|
960 if (val == EWOULDBLOCK)
|
|
|
961 return 1;
|
|
|
962 #endif
|
|
|
963 #ifdef EAGAIN
|
|
|
964 if (val == EAGAIN)
|
|
|
965 return 1;
|
|
|
966 #endif
|
|
|
967 return 0;
|
|
|
968 }
|
|
|
969
|
|
|
970 static ssize_t
|
|
442
|
971 filedesc_writer (Lstream *stream, const unsigned char *data, size_t size)
|
|
428
|
972 {
|
|
|
973 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
974 ssize_t retval;
|
|
|
975 int need_newline = 0;
|
|
|
976
|
|
|
977 /* This function would be simple if it were not for the blasted
|
|
|
978 PTY max-bytes stuff. Why the hell can't they just have written
|
|
|
979 the PTY drivers right so this problem doesn't exist?
|
|
|
980
|
|
|
981 Maybe all the PTY crap here should be moved into another stream
|
|
|
982 that does nothing but periodically insert EOF's as necessary. */
|
|
|
983 if (str->pty_flushing)
|
|
|
984 {
|
|
|
985 /* To make life easy, only send out one line at the most. */
|
|
442
|
986 const unsigned char *ptr;
|
|
428
|
987
|
|
442
|
988 ptr = (const unsigned char *) memchr (data, '\n', size);
|
|
428
|
989 if (ptr)
|
|
|
990 need_newline = 1;
|
|
|
991 else
|
|
|
992 ptr = data + size;
|
|
|
993 if (ptr - data >= str->pty_max_bytes - str->chars_sans_newline)
|
|
|
994 {
|
|
|
995 ptr = data + str->pty_max_bytes - str->chars_sans_newline;
|
|
|
996 need_newline = 0;
|
|
|
997 }
|
|
|
998 size = ptr - data;
|
|
|
999 }
|
|
|
1000
|
|
|
1001 /**** start of non-PTY-crap ****/
|
|
|
1002 if (size > 0)
|
|
430
|
1003 retval = str->allow_quit ?
|
|
|
1004 write_allowing_quit (str->fd, data, size) :
|
|
|
1005 write (str->fd, data, size);
|
|
428
|
1006 else
|
|
|
1007 retval = 0;
|
|
|
1008 if (retval < 0 && errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1009 {
|
|
|
1010 str->blocking_error_p = 1;
|
|
|
1011 return 0;
|
|
|
1012 }
|
|
|
1013 str->blocking_error_p = 0;
|
|
|
1014 if (retval < 0)
|
|
|
1015 return retval;
|
|
|
1016 /**** end non-PTY-crap ****/
|
|
|
1017
|
|
|
1018 if (str->pty_flushing)
|
|
|
1019 {
|
|
|
1020 str->chars_sans_newline += retval;
|
|
|
1021 /* Note that a newline was not among the bytes written out.
|
|
|
1022 Add to the number of non-newline bytes written out,
|
|
|
1023 and flush with an EOF if necessary. Be careful to
|
|
|
1024 keep track of write errors as we go along and look
|
|
|
1025 out for EWOULDBLOCK. */
|
|
|
1026 if (str->chars_sans_newline >= str->pty_max_bytes)
|
|
|
1027 {
|
|
430
|
1028 ssize_t retval2 = str->allow_quit ?
|
|
|
1029 write_allowing_quit (str->fd, &str->eof_char, 1) :
|
|
|
1030 write (str->fd, &str->eof_char, 1);
|
|
|
1031
|
|
428
|
1032 if (retval2 > 0)
|
|
|
1033 str->chars_sans_newline = 0;
|
|
|
1034 else if (retval2 < 0)
|
|
|
1035 {
|
|
|
1036 /* Error writing the EOF char. If nothing got written,
|
|
|
1037 then treat this as an error -- either return an error
|
|
|
1038 condition or set the blocking-error flag. */
|
|
|
1039 if (retval == 0)
|
|
|
1040 {
|
|
|
1041 if (errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1042 {
|
|
|
1043 str->blocking_error_p = 1;
|
|
|
1044 return 0;
|
|
|
1045 }
|
|
|
1046 else
|
|
|
1047 return retval2;
|
|
|
1048 }
|
|
|
1049 else
|
|
|
1050 return retval;
|
|
|
1051 }
|
|
|
1052 }
|
|
|
1053 }
|
|
|
1054
|
|
|
1055 /* The need_newline flag is necessary because otherwise when the
|
|
|
1056 first byte is a newline, we'd get stuck never writing anything
|
|
|
1057 in pty-flushing mode. */
|
|
|
1058 if (need_newline)
|
|
|
1059 {
|
|
|
1060 Bufbyte nl = '\n';
|
|
430
|
1061 ssize_t retval2 = str->allow_quit ?
|
|
|
1062 write_allowing_quit (str->fd, &nl, 1) :
|
|
|
1063 write (str->fd, &nl, 1);
|
|
|
1064
|
|
428
|
1065 if (retval2 > 0)
|
|
|
1066 {
|
|
|
1067 str->chars_sans_newline = 0;
|
|
|
1068 retval++;
|
|
|
1069 }
|
|
|
1070 else if (retval2 < 0)
|
|
|
1071 {
|
|
|
1072 /* Error writing the newline char. If nothing got written,
|
|
|
1073 then treat this as an error -- either return an error
|
|
|
1074 condition or set the blocking-error flag. */
|
|
|
1075 if (retval == 0)
|
|
|
1076 {
|
|
|
1077 if (errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1078 {
|
|
|
1079 str->blocking_error_p = 1;
|
|
|
1080 return 0;
|
|
|
1081 }
|
|
|
1082 else
|
|
|
1083 return retval2;
|
|
|
1084 }
|
|
|
1085 else
|
|
|
1086 return retval;
|
|
|
1087 }
|
|
|
1088 }
|
|
|
1089
|
|
|
1090 return retval;
|
|
|
1091 }
|
|
|
1092
|
|
|
1093 static int
|
|
|
1094 filedesc_rewinder (Lstream *stream)
|
|
|
1095 {
|
|
|
1096 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1097 if (str->starting_pos < 0 ||
|
|
|
1098 lseek (FILEDESC_STREAM_DATA (stream)->fd, str->starting_pos,
|
|
|
1099 SEEK_SET) == -1)
|
|
|
1100 return -1;
|
|
|
1101 else
|
|
|
1102 {
|
|
|
1103 str->current_pos = str->starting_pos;
|
|
|
1104 return 0;
|
|
|
1105 }
|
|
|
1106 }
|
|
|
1107
|
|
|
1108 static int
|
|
|
1109 filedesc_seekable_p (Lstream *stream)
|
|
|
1110 {
|
|
|
1111 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1112 if (str->starting_pos < 0)
|
|
|
1113 return 0;
|
|
|
1114 else
|
|
|
1115 {
|
|
|
1116 struct stat lestat;
|
|
|
1117
|
|
|
1118 if (fstat (str->fd, &lestat) < 0)
|
|
|
1119 return 0;
|
|
|
1120 return S_ISREG (lestat.st_mode);
|
|
|
1121 }
|
|
|
1122 }
|
|
|
1123
|
|
|
1124 static int
|
|
|
1125 filedesc_closer (Lstream *stream)
|
|
|
1126 {
|
|
|
1127 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1128 if (str->closing)
|
|
|
1129 return close (str->fd);
|
|
|
1130 else
|
|
|
1131 return 0;
|
|
|
1132 }
|
|
|
1133
|
|
|
1134 static int
|
|
|
1135 filedesc_was_blocked_p (Lstream *stream)
|
|
|
1136 {
|
|
|
1137 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1138 return str->blocking_error_p;
|
|
|
1139 }
|
|
|
1140
|
|
|
1141 void
|
|
|
1142 filedesc_stream_set_pty_flushing (Lstream *stream, int pty_max_bytes,
|
|
|
1143 Bufbyte eof_char)
|
|
|
1144 {
|
|
|
1145 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1146 str->pty_max_bytes = pty_max_bytes;
|
|
|
1147 str->eof_char = eof_char;
|
|
|
1148 str->pty_flushing = 1;
|
|
|
1149 }
|
|
|
1150
|
|
|
1151 int
|
|
|
1152 filedesc_stream_fd (Lstream *stream)
|
|
|
1153 {
|
|
|
1154 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1155 return str->fd;
|
|
|
1156 }
|
|
|
1157
|
|
|
1158 /*********** read from a Lisp string ***********/
|
|
|
1159
|
|
|
1160 #define LISP_STRING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, lisp_string)
|
|
|
1161
|
|
|
1162 struct lisp_string_stream
|
|
|
1163 {
|
|
|
1164 Lisp_Object obj;
|
|
|
1165 Bytecount init_offset;
|
|
|
1166 Bytecount offset, end;
|
|
|
1167 };
|
|
|
1168
|
|
|
1169 DEFINE_LSTREAM_IMPLEMENTATION ("lisp-string", lstream_lisp_string,
|
|
|
1170 sizeof (struct lisp_string_stream));
|
|
|
1171
|
|
|
1172 Lisp_Object
|
|
|
1173 make_lisp_string_input_stream (Lisp_Object string, Bytecount offset,
|
|
|
1174 Bytecount len)
|
|
|
1175 {
|
|
|
1176 Lisp_Object obj;
|
|
|
1177 Lstream *lstr;
|
|
|
1178 struct lisp_string_stream *str;
|
|
|
1179
|
|
|
1180 CHECK_STRING (string);
|
|
|
1181 if (len < 0)
|
|
|
1182 len = XSTRING_LENGTH (string) - offset;
|
|
|
1183 assert (offset >= 0);
|
|
|
1184 assert (len >= 0);
|
|
|
1185 assert (offset + len <= XSTRING_LENGTH (string));
|
|
|
1186
|
|
|
1187 lstr = Lstream_new (lstream_lisp_string, "r");
|
|
|
1188 str = LISP_STRING_STREAM_DATA (lstr);
|
|
|
1189 str->offset = offset;
|
|
|
1190 str->end = offset + len;
|
|
|
1191 str->init_offset = offset;
|
|
|
1192 str->obj = string;
|
|
|
1193 XSETLSTREAM (obj, lstr);
|
|
|
1194 return obj;
|
|
|
1195 }
|
|
|
1196
|
|
|
1197 static ssize_t
|
|
|
1198 lisp_string_reader (Lstream *stream, unsigned char *data, size_t size)
|
|
|
1199 {
|
|
|
1200 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream);
|
|
|
1201 /* Don't lose if the string shrank past us ... */
|
|
|
1202 Bytecount offset = min (str->offset, XSTRING_LENGTH (str->obj));
|
|
|
1203 Bufbyte *strstart = XSTRING_DATA (str->obj);
|
|
|
1204 Bufbyte *start = strstart + offset;
|
|
|
1205
|
|
|
1206 /* ... or if someone changed the string and we ended up in the
|
|
|
1207 middle of a character. */
|
|
|
1208 /* Being in the middle of a character is `normal' unless
|
|
|
1209 LSTREAM_NO_PARTIAL_CHARS - mrb */
|
|
|
1210 if (stream->flags & LSTREAM_FL_NO_PARTIAL_CHARS)
|
|
|
1211 VALIDATE_CHARPTR_BACKWARD (start);
|
|
|
1212 offset = start - strstart;
|
|
|
1213 size = min (size, (size_t) (str->end - offset));
|
|
|
1214 memcpy (data, start, size);
|
|
|
1215 str->offset = offset + size;
|
|
|
1216 return size;
|
|
|
1217 }
|
|
|
1218
|
|
|
1219 static int
|
|
|
1220 lisp_string_rewinder (Lstream *stream)
|
|
|
1221 {
|
|
|
1222 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream);
|
|
|
1223 int pos = str->init_offset;
|
|
|
1224 if (pos > str->end)
|
|
|
1225 pos = str->end;
|
|
|
1226 /* Don't lose if the string shrank past us ... */
|
|
|
1227 pos = min (pos, XSTRING_LENGTH (str->obj));
|
|
|
1228 /* ... or if someone changed the string and we ended up in the
|
|
|
1229 middle of a character. */
|
|
|
1230 {
|
|
|
1231 Bufbyte *strstart = XSTRING_DATA (str->obj);
|
|
|
1232 Bufbyte *start = strstart + pos;
|
|
|
1233 VALIDATE_CHARPTR_BACKWARD (start);
|
|
|
1234 pos = start - strstart;
|
|
|
1235 }
|
|
|
1236 str->offset = pos;
|
|
|
1237 return 0;
|
|
|
1238 }
|
|
|
1239
|
|
|
1240 static Lisp_Object
|
|
|
1241 lisp_string_marker (Lisp_Object stream)
|
|
|
1242 {
|
|
|
1243 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (XLSTREAM (stream));
|
|
|
1244 return str->obj;
|
|
|
1245 }
|
|
|
1246
|
|
|
1247 /*********** a fixed buffer ***********/
|
|
|
1248
|
|
|
1249 #define FIXED_BUFFER_STREAM_DATA(stream) \
|
|
|
1250 LSTREAM_TYPE_DATA (stream, fixed_buffer)
|
|
|
1251
|
|
|
1252 struct fixed_buffer_stream
|
|
|
1253 {
|
|
442
|
1254 const unsigned char *inbuf;
|
|
428
|
1255 unsigned char *outbuf;
|
|
|
1256 size_t size;
|
|
|
1257 size_t offset;
|
|
|
1258 };
|
|
|
1259
|
|
|
1260 DEFINE_LSTREAM_IMPLEMENTATION ("fixed-buffer", lstream_fixed_buffer,
|
|
|
1261 sizeof (struct fixed_buffer_stream));
|
|
|
1262
|
|
|
1263 Lisp_Object
|
|
442
|
1264 make_fixed_buffer_input_stream (const void *buf, size_t size)
|
|
428
|
1265 {
|
|
|
1266 Lisp_Object obj;
|
|
|
1267 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "r");
|
|
|
1268 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr);
|
|
440
|
1269 str->inbuf = (const unsigned char *) buf;
|
|
428
|
1270 str->size = size;
|
|
|
1271 XSETLSTREAM (obj, lstr);
|
|
|
1272 return obj;
|
|
|
1273 }
|
|
|
1274
|
|
|
1275 Lisp_Object
|
|
440
|
1276 make_fixed_buffer_output_stream (void *buf, size_t size)
|
|
428
|
1277 {
|
|
|
1278 Lisp_Object obj;
|
|
|
1279 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "w");
|
|
|
1280 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr);
|
|
440
|
1281 str->outbuf = (unsigned char *) buf;
|
|
428
|
1282 str->size = size;
|
|
|
1283 XSETLSTREAM (obj, lstr);
|
|
|
1284 return obj;
|
|
|
1285 }
|
|
|
1286
|
|
|
1287 static ssize_t
|
|
|
1288 fixed_buffer_reader (Lstream *stream, unsigned char *data, size_t size)
|
|
|
1289 {
|
|
|
1290 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream);
|
|
|
1291 size = min (size, str->size - str->offset);
|
|
|
1292 memcpy (data, str->inbuf + str->offset, size);
|
|
|
1293 str->offset += size;
|
|
|
1294 return size;
|
|
|
1295 }
|
|
|
1296
|
|
|
1297 static ssize_t
|
|
442
|
1298 fixed_buffer_writer (Lstream *stream, const unsigned char *data, size_t size)
|
|
428
|
1299 {
|
|
|
1300 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream);
|
|
|
1301 if (str->offset == str->size)
|
|
|
1302 {
|
|
|
1303 /* If we're at the end, just throw away the data and pretend
|
|
|
1304 we wrote all of it. If we return 0, then the lstream routines
|
|
|
1305 will try again and again to write it out. */
|
|
|
1306 return size;
|
|
|
1307 }
|
|
|
1308 size = min (size, str->size - str->offset);
|
|
|
1309 memcpy (str->outbuf + str->offset, data, size);
|
|
|
1310 str->offset += size;
|
|
|
1311 return size;
|
|
|
1312 }
|
|
|
1313
|
|
|
1314 static int
|
|
|
1315 fixed_buffer_rewinder (Lstream *stream)
|
|
|
1316 {
|
|
|
1317 FIXED_BUFFER_STREAM_DATA (stream)->offset = 0;
|
|
|
1318 return 0;
|
|
|
1319 }
|
|
|
1320
|
|
442
|
1321 const unsigned char *
|
|
428
|
1322 fixed_buffer_input_stream_ptr (Lstream *stream)
|
|
|
1323 {
|
|
|
1324 assert (stream->imp == lstream_fixed_buffer);
|
|
|
1325 return FIXED_BUFFER_STREAM_DATA (stream)->inbuf;
|
|
|
1326 }
|
|
|
1327
|
|
|
1328 unsigned char *
|
|
|
1329 fixed_buffer_output_stream_ptr (Lstream *stream)
|
|
|
1330 {
|
|
|
1331 assert (stream->imp == lstream_fixed_buffer);
|
|
|
1332 return FIXED_BUFFER_STREAM_DATA (stream)->outbuf;
|
|
|
1333 }
|
|
|
1334
|
|
|
1335 /*********** write to a resizing buffer ***********/
|
|
|
1336
|
|
|
1337 #define RESIZING_BUFFER_STREAM_DATA(stream) \
|
|
|
1338 LSTREAM_TYPE_DATA (stream, resizing_buffer)
|
|
|
1339
|
|
|
1340 struct resizing_buffer_stream
|
|
|
1341 {
|
|
|
1342 unsigned char *buf;
|
|
|
1343 size_t allocked;
|
|
|
1344 int max_stored;
|
|
|
1345 int stored;
|
|
|
1346 };
|
|
|
1347
|
|
|
1348 DEFINE_LSTREAM_IMPLEMENTATION ("resizing-buffer", lstream_resizing_buffer,
|
|
|
1349 sizeof (struct resizing_buffer_stream));
|
|
|
1350
|
|
|
1351 Lisp_Object
|
|
|
1352 make_resizing_buffer_output_stream (void)
|
|
|
1353 {
|
|
|
1354 Lisp_Object obj;
|
|
|
1355 XSETLSTREAM (obj, Lstream_new (lstream_resizing_buffer, "w"));
|
|
|
1356 return obj;
|
|
|
1357 }
|
|
|
1358
|
|
|
1359 static ssize_t
|
|
442
|
1360 resizing_buffer_writer (Lstream *stream, const unsigned char *data, size_t size)
|
|
428
|
1361 {
|
|
|
1362 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream);
|
|
|
1363 DO_REALLOC (str->buf, str->allocked, str->stored + size, unsigned char);
|
|
|
1364 memcpy (str->buf + str->stored, data, size);
|
|
|
1365 str->stored += size;
|
|
|
1366 str->max_stored = max (str->max_stored, str->stored);
|
|
|
1367 return size;
|
|
|
1368 }
|
|
|
1369
|
|
|
1370 static int
|
|
|
1371 resizing_buffer_rewinder (Lstream *stream)
|
|
|
1372 {
|
|
|
1373 RESIZING_BUFFER_STREAM_DATA (stream)->stored = 0;
|
|
|
1374 return 0;
|
|
|
1375 }
|
|
|
1376
|
|
|
1377 static int
|
|
|
1378 resizing_buffer_closer (Lstream *stream)
|
|
|
1379 {
|
|
|
1380 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream);
|
|
|
1381 if (str->buf)
|
|
|
1382 {
|
|
|
1383 xfree (str->buf);
|
|
|
1384 str->buf = 0;
|
|
|
1385 }
|
|
|
1386 return 0;
|
|
|
1387 }
|
|
|
1388
|
|
|
1389 unsigned char *
|
|
|
1390 resizing_buffer_stream_ptr (Lstream *stream)
|
|
|
1391 {
|
|
|
1392 return RESIZING_BUFFER_STREAM_DATA (stream)->buf;
|
|
|
1393 }
|
|
|
1394
|
|
|
1395 /*********** write to an unsigned-char dynarr ***********/
|
|
|
1396
|
|
|
1397 /* Note: If you have a dynarr whose type is not unsigned_char_dynarr
|
|
|
1398 but which is really just an unsigned_char_dynarr (e.g. its type
|
|
|
1399 is Bufbyte or Extbyte), just cast to unsigned_char_dynarr. */
|
|
|
1400
|
|
|
1401 #define DYNARR_STREAM_DATA(stream) \
|
|
|
1402 LSTREAM_TYPE_DATA (stream, dynarr)
|
|
|
1403
|
|
|
1404 struct dynarr_stream
|
|
|
1405 {
|
|
|
1406 unsigned_char_dynarr *dyn;
|
|
|
1407 };
|
|
|
1408
|
|
|
1409 DEFINE_LSTREAM_IMPLEMENTATION ("dynarr", lstream_dynarr,
|
|
|
1410 sizeof (struct dynarr_stream));
|
|
|
1411
|
|
|
1412 Lisp_Object
|
|
|
1413 make_dynarr_output_stream (unsigned_char_dynarr *dyn)
|
|
|
1414 {
|
|
|
1415 Lisp_Object obj;
|
|
|
1416 XSETLSTREAM (obj, Lstream_new (lstream_dynarr, "w"));
|
|
|
1417 DYNARR_STREAM_DATA (XLSTREAM (obj))->dyn = dyn;
|
|
|
1418 return obj;
|
|
|
1419 }
|
|
|
1420
|
|
|
1421 static ssize_t
|
|
442
|
1422 dynarr_writer (Lstream *stream, const unsigned char *data, size_t size)
|
|
428
|
1423 {
|
|
|
1424 struct dynarr_stream *str = DYNARR_STREAM_DATA (stream);
|
|
|
1425 Dynarr_add_many (str->dyn, data, size);
|
|
|
1426 return size;
|
|
|
1427 }
|
|
|
1428
|
|
|
1429 static int
|
|
|
1430 dynarr_rewinder (Lstream *stream)
|
|
|
1431 {
|
|
|
1432 Dynarr_reset (DYNARR_STREAM_DATA (stream)->dyn);
|
|
|
1433 return 0;
|
|
|
1434 }
|
|
|
1435
|
|
|
1436 static int
|
|
|
1437 dynarr_closer (Lstream *stream)
|
|
|
1438 {
|
|
|
1439 return 0;
|
|
|
1440 }
|
|
|
1441
|
|
|
1442 /************ read from or write to a Lisp buffer ************/
|
|
|
1443
|
|
|
1444 /* Note: Lisp-buffer read streams never return partial characters,
|
|
|
1445 and Lisp-buffer write streams expect to never get partial
|
|
|
1446 characters. */
|
|
|
1447
|
|
|
1448 #define LISP_BUFFER_STREAM_DATA(stream) \
|
|
|
1449 LSTREAM_TYPE_DATA (stream, lisp_buffer)
|
|
|
1450
|
|
|
1451 struct lisp_buffer_stream
|
|
|
1452 {
|
|
|
1453 Lisp_Object buffer;
|
|
|
1454 Lisp_Object orig_start;
|
|
|
1455 /* we use markers to properly deal with insertion/deletion */
|
|
|
1456 Lisp_Object start, end;
|
|
|
1457 int flags;
|
|
|
1458 };
|
|
|
1459
|
|
|
1460 DEFINE_LSTREAM_IMPLEMENTATION ("lisp-buffer", lstream_lisp_buffer,
|
|
|
1461 sizeof (struct lisp_buffer_stream));
|
|
|
1462
|
|
|
1463 static Lisp_Object
|
|
|
1464 make_lisp_buffer_stream_1 (struct buffer *buf, Bufpos start, Bufpos end,
|
|
442
|
1465 int flags, const char *mode)
|
|
428
|
1466 {
|
|
|
1467 Lisp_Object obj;
|
|
|
1468 Lstream *lstr;
|
|
|
1469 struct lisp_buffer_stream *str;
|
|
|
1470 Bufpos bmin, bmax;
|
|
|
1471 int reading = !strcmp (mode, "r");
|
|
|
1472
|
|
|
1473 /* Make sure the luser didn't pass "w" in. */
|
|
|
1474 if (!strcmp (mode, "w"))
|
|
|
1475 abort ();
|
|
|
1476
|
|
|
1477 if (flags & LSTR_IGNORE_ACCESSIBLE)
|
|
|
1478 {
|
|
|
1479 bmin = BUF_BEG (buf);
|
|
|
1480 bmax = BUF_Z (buf);
|
|
|
1481 }
|
|
|
1482 else
|
|
|
1483 {
|
|
|
1484 bmin = BUF_BEGV (buf);
|
|
|
1485 bmax = BUF_ZV (buf);
|
|
|
1486 }
|
|
|
1487
|
|
|
1488 if (start == -1)
|
|
|
1489 start = bmin;
|
|
|
1490 if (end == -1)
|
|
|
1491 end = bmax;
|
|
|
1492 assert (bmin <= start);
|
|
|
1493 assert (start <= bmax);
|
|
|
1494 if (reading)
|
|
|
1495 {
|
|
|
1496 assert (bmin <= end);
|
|
|
1497 assert (end <= bmax);
|
|
|
1498 assert (start <= end);
|
|
|
1499 }
|
|
|
1500
|
|
|
1501 lstr = Lstream_new (lstream_lisp_buffer, mode);
|
|
|
1502 str = LISP_BUFFER_STREAM_DATA (lstr);
|
|
|
1503 {
|
|
|
1504 Lisp_Object marker;
|
|
|
1505 Lisp_Object buffer;
|
|
|
1506
|
|
|
1507 XSETBUFFER (buffer, buf);
|
|
|
1508 marker = Fmake_marker ();
|
|
|
1509 Fset_marker (marker, make_int (start), buffer);
|
|
|
1510 str->start = marker;
|
|
|
1511 marker = Fmake_marker ();
|
|
|
1512 Fset_marker (marker, make_int (start), buffer);
|
|
|
1513 str->orig_start = marker;
|
|
|
1514 if (reading)
|
|
|
1515 {
|
|
|
1516 marker = Fmake_marker ();
|
|
|
1517 Fset_marker (marker, make_int (end), buffer);
|
|
|
1518 str->end = marker;
|
|
|
1519 }
|
|
|
1520 else
|
|
|
1521 str->end = Qnil;
|
|
|
1522 str->buffer = buffer;
|
|
|
1523 }
|
|
|
1524 str->flags = flags;
|
|
|
1525 XSETLSTREAM (obj, lstr);
|
|
|
1526 return obj;
|
|
|
1527 }
|
|
|
1528
|
|
|
1529 Lisp_Object
|
|
|
1530 make_lisp_buffer_input_stream (struct buffer *buf, Bufpos start, Bufpos end,
|
|
|
1531 int flags)
|
|
|
1532 {
|
|
|
1533 return make_lisp_buffer_stream_1 (buf, start, end, flags, "r");
|
|
|
1534 }
|
|
|
1535
|
|
|
1536 Lisp_Object
|
|
|
1537 make_lisp_buffer_output_stream (struct buffer *buf, Bufpos pos, int flags)
|
|
|
1538 {
|
|
|
1539 Lisp_Object lstr = make_lisp_buffer_stream_1 (buf, pos, 0, flags, "wc");
|
|
|
1540
|
|
|
1541 Lstream_set_character_mode (XLSTREAM (lstr));
|
|
|
1542 return lstr;
|
|
|
1543 }
|
|
|
1544
|
|
|
1545 static ssize_t
|
|
|
1546 lisp_buffer_reader (Lstream *stream, unsigned char *data, size_t size)
|
|
|
1547 {
|
|
|
1548 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream);
|
|
|
1549 unsigned char *orig_data = data;
|
|
|
1550 Bytind start;
|
|
|
1551 Bytind end;
|
|
|
1552 struct buffer *buf = XBUFFER (str->buffer);
|
|
|
1553
|
|
|
1554 if (!BUFFER_LIVE_P (buf))
|
|
|
1555 return 0; /* Fut. */
|
|
|
1556
|
|
|
1557 /* NOTE: We do all our operations in Bytind's.
|
|
|
1558 Keep in mind that SIZE is a value in bytes, not chars. */
|
|
|
1559
|
|
|
1560 start = bi_marker_position (str->start);
|
|
|
1561 end = bi_marker_position (str->end);
|
|
|
1562 if (!(str->flags & LSTR_IGNORE_ACCESSIBLE))
|
|
|
1563 {
|
|
|
1564 start = bytind_clip_to_bounds (BI_BUF_BEGV (buf), start,
|
|
|
1565 BI_BUF_ZV (buf));
|
|
|
1566 end = bytind_clip_to_bounds (BI_BUF_BEGV (buf), end,
|
|
|
1567 BI_BUF_ZV (buf));
|
|
|
1568 }
|
|
|
1569
|
|
|
1570 size = min (size, (size_t) (end - start));
|
|
|
1571 end = start + size;
|
|
|
1572 /* We cannot return a partial character. */
|
|
|
1573 VALIDATE_BYTIND_BACKWARD (buf, end);
|
|
|
1574
|
|
|
1575 while (start < end)
|
|
|
1576 {
|
|
|
1577 Bytind ceil;
|
|
|
1578 Bytecount chunk;
|
|
|
1579
|
|
|
1580 if (str->flags & LSTR_IGNORE_ACCESSIBLE)
|
|
|
1581 ceil = BI_BUF_CEILING_OF_IGNORE_ACCESSIBLE (buf, start);
|
|
|
1582 else
|
|
|
1583 ceil = BI_BUF_CEILING_OF (buf, start);
|
|
|
1584 chunk = min (ceil, end) - start;
|
|
|
1585 memcpy (data, BI_BUF_BYTE_ADDRESS (buf, start), chunk);
|
|
|
1586 data += chunk;
|
|
|
1587 start += chunk;
|
|
|
1588 }
|
|
|
1589
|
|
|
1590 if (EQ (buf->selective_display, Qt) && str->flags & LSTR_SELECTIVE)
|
|
|
1591 {
|
|
|
1592 /* What a kludge. What a kludge. What a kludge. */
|
|
|
1593 unsigned char *p;
|
|
|
1594 for (p = orig_data; p < data; p++)
|
|
|
1595 if (*p == '\r')
|
|
|
1596 *p = '\n';
|
|
|
1597 }
|
|
|
1598
|
|
|
1599 set_bi_marker_position (str->start, end);
|
|
|
1600 return data - orig_data;
|
|
|
1601 }
|
|
|
1602
|
|
|
1603 static ssize_t
|
|
442
|
1604 lisp_buffer_writer (Lstream *stream, const unsigned char *data, size_t size)
|
|
428
|
1605 {
|
|
|
1606 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream);
|
|
|
1607 Bufpos pos;
|
|
|
1608 struct buffer *buf = XBUFFER (str->buffer);
|
|
|
1609
|
|
|
1610 if (!BUFFER_LIVE_P (buf))
|
|
|
1611 return 0; /* Fut. */
|
|
|
1612
|
|
|
1613 pos = marker_position (str->start);
|
|
|
1614 pos += buffer_insert_raw_string_1 (buf, pos, data, size, 0);
|
|
|
1615 set_marker_position (str->start, pos);
|
|
|
1616 return size;
|
|
|
1617 }
|
|
|
1618
|
|
|
1619 static int
|
|
|
1620 lisp_buffer_rewinder (Lstream *stream)
|
|
|
1621 {
|
|
|
1622 struct lisp_buffer_stream *str =
|
|
|
1623 LISP_BUFFER_STREAM_DATA (stream);
|
|
|
1624 struct buffer *buf = XBUFFER (str->buffer);
|
|
|
1625 long pos = marker_position (str->orig_start);
|
|
|
1626 if (!BUFFER_LIVE_P (buf))
|
|
|
1627 return -1; /* Fut. */
|
|
|
1628 if (pos > BUF_ZV (buf))
|
|
|
1629 pos = BUF_ZV (buf);
|
|
|
1630 if (pos < marker_position (str->orig_start))
|
|
|
1631 pos = marker_position (str->orig_start);
|
|
|
1632 if (MARKERP (str->end) && pos > marker_position (str->end))
|
|
|
1633 pos = marker_position (str->end);
|
|
|
1634 set_marker_position (str->start, pos);
|
|
|
1635 return 0;
|
|
|
1636 }
|
|
|
1637
|
|
|
1638 static Lisp_Object
|
|
|
1639 lisp_buffer_marker (Lisp_Object stream)
|
|
|
1640 {
|
|
|
1641 struct lisp_buffer_stream *str =
|
|
|
1642 LISP_BUFFER_STREAM_DATA (XLSTREAM (stream));
|
|
|
1643
|
|
|
1644 mark_object (str->start);
|
|
|
1645 mark_object (str->end);
|
|
|
1646 return str->buffer;
|
|
|
1647 }
|
|
|
1648
|
|
|
1649 Bufpos
|
|
|
1650 lisp_buffer_stream_startpos (Lstream *stream)
|
|
|
1651 {
|
|
|
1652 return marker_position (LISP_BUFFER_STREAM_DATA (stream)->start);
|
|
|
1653 }
|
|
|
1654
|
|
|
1655
|
|
|
1656 /************************************************************************/
|
|
|
1657 /* initialization */
|
|
|
1658 /************************************************************************/
|
|
|
1659
|
|
|
1660 void
|
|
|
1661 lstream_type_create (void)
|
|
|
1662 {
|
|
|
1663 LSTREAM_HAS_METHOD (stdio, reader);
|
|
|
1664 LSTREAM_HAS_METHOD (stdio, writer);
|
|
|
1665 LSTREAM_HAS_METHOD (stdio, rewinder);
|
|
|
1666 LSTREAM_HAS_METHOD (stdio, seekable_p);
|
|
|
1667 LSTREAM_HAS_METHOD (stdio, flusher);
|
|
|
1668 LSTREAM_HAS_METHOD (stdio, closer);
|
|
|
1669
|
|
|
1670 LSTREAM_HAS_METHOD (filedesc, reader);
|
|
|
1671 LSTREAM_HAS_METHOD (filedesc, writer);
|
|
|
1672 LSTREAM_HAS_METHOD (filedesc, was_blocked_p);
|
|
|
1673 LSTREAM_HAS_METHOD (filedesc, rewinder);
|
|
|
1674 LSTREAM_HAS_METHOD (filedesc, seekable_p);
|
|
|
1675 LSTREAM_HAS_METHOD (filedesc, closer);
|
|
|
1676
|
|
|
1677 LSTREAM_HAS_METHOD (lisp_string, reader);
|
|
|
1678 LSTREAM_HAS_METHOD (lisp_string, rewinder);
|
|
|
1679 LSTREAM_HAS_METHOD (lisp_string, marker);
|
|
|
1680
|
|
|
1681 LSTREAM_HAS_METHOD (fixed_buffer, reader);
|
|
|
1682 LSTREAM_HAS_METHOD (fixed_buffer, writer);
|
|
|
1683 LSTREAM_HAS_METHOD (fixed_buffer, rewinder);
|
|
|
1684
|
|
|
1685 LSTREAM_HAS_METHOD (resizing_buffer, writer);
|
|
|
1686 LSTREAM_HAS_METHOD (resizing_buffer, rewinder);
|
|
|
1687 LSTREAM_HAS_METHOD (resizing_buffer, closer);
|
|
|
1688
|
|
|
1689 LSTREAM_HAS_METHOD (dynarr, writer);
|
|
|
1690 LSTREAM_HAS_METHOD (dynarr, rewinder);
|
|
|
1691 LSTREAM_HAS_METHOD (dynarr, closer);
|
|
|
1692
|
|
|
1693 LSTREAM_HAS_METHOD (lisp_buffer, reader);
|
|
|
1694 LSTREAM_HAS_METHOD (lisp_buffer, writer);
|
|
|
1695 LSTREAM_HAS_METHOD (lisp_buffer, rewinder);
|
|
|
1696 LSTREAM_HAS_METHOD (lisp_buffer, marker);
|
|
|
1697 }
|
|
|
1698
|
|
|
1699 void
|
|
|
1700 reinit_vars_of_lstream (void)
|
|
|
1701 {
|
|
|
1702 int i;
|
|
|
1703
|
|
|
1704 for (i = 0; i < countof (Vlstream_free_list); i++)
|
|
|
1705 {
|
|
|
1706 Vlstream_free_list[i] = Qnil;
|
|
|
1707 staticpro_nodump (&Vlstream_free_list[i]);
|
|
|
1708 }
|
|
|
1709 }
|
|
|
1710
|
|
|
1711 void
|
|
|
1712 vars_of_lstream (void)
|
|
|
1713 {
|
|
442
|
1714 INIT_LRECORD_IMPLEMENTATION (lstream);
|
|
|
1715
|
|
428
|
1716 reinit_vars_of_lstream ();
|
|
|
1717 }
|
