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0
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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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54 Lstream *Lstream_new (Lstream_implementation *imp, CONST char *mode)
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55 Allocate and return a new Lstream. This function is not
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56 really meant to be called directly; rather, each stream type
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57 should provide its own stream creation function, which
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58 creates the stream and does any other necessary creation
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59 stuff (e.g. opening a file).
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60
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61 void Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering,
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62 int buffering_size)
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63 Change the buffering of a stream. See lstream.h. By default
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64 the buffering is STREAM_BLOCK_BUFFERED.
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65
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66 int Lstream_flush (Lstream *lstr)
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67 Flush out any pending unwritten data in the stream. Clear
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68 any buffered input data. Returns 0 on success, -1 on error.
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69
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70 int Lstream_putc (Lstream *stream, int c)
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71 Write out one byte to the stream. This is a macro and so
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72 it is very efficient. The C argument is only evaluated once
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73 but the STREAM argument is evaluated more than once. Returns
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74 0 on success, -1 on error.
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75
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76 int Lstream_getc (Lstream *stream)
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77 Read one byte from the stream. This is a macro and so it
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78 is very efficient. The STREAM argument is evaluated more
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79 than once. Return value is -1 for EOF or error.
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80
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81 void Lstream_ungetc (Lstream *stream, int c)
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82 Push one byte back onto the input queue. This will be the
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83 next byte read from the stream. Any number of bytes can be
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84 pushed back and will be read in the reverse order they were
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85 pushed back -- most recent first. (This is necessary for
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86 consistency -- if there are a number of bytes that have been
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87 unread and I read and unread a byte, it needs to be the first
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88 to be read again.) This is a macro and so it is very
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89 efficient. The C argument is only evaluated once but the
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90 STREAM argument is evaluated more than once.
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91
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92 int Lstream_fputc (Lstream *stream, int c)
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93 int Lstream_fgetc (Lstream *stream)
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94 void Lstream_fungetc (Lstream *stream, int c)
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95 Function equivalents of the above macros.
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96
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97 int Lstream_read (Lstream *stream, void *data, int size)
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98 Read SIZE bytes of DATA from the stream. Return the number of
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99 bytes read. 0 means EOF. -1 means an error occurred and no
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100 bytes were read.
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101
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102 int Lstream_write (Lstream *stream, void *data, int size)
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103 Write SIZE bytes of DATA to the stream. Return the number of
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104 bytes written. -1 means an error occurred and no bytes were
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105 written.
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106
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107 void Lstream_unread (Lstream *stream, void *data, int size)
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108 Push back SIZE bytes of DATA onto the input queue. The
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109 next call to Lstream_read() with the same size will read the
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110 same bytes back. Note that this will be the case even if
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111 there is other pending unread data.
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112
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113 int Lstream_close (Lstream *stream)
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114 Close the stream. All data will be flushed out.
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115
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116 void Lstream_reopen (Lstream *stream)
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117 Reopen a closed stream. This enables I/O on it again.
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118 This is not meant to be called except from a wrapper routine
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119 that reinitializes variables and such -- the close routine
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120 may well have freed some necessary storage structures, for
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121 example.
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122
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123 void Lstream_rewind (Lstream *stream)
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124 Rewind the stream to the beginning.
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16
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125 */
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126
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127 #ifdef MULE
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128 MAC_DEFINE (Emchar, MTlstream_emchar)
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129 MAC_DEFINE (int, MTlstream_emcint)
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130 #endif
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0
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131
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132 MAC_DEFINE (struct lstream *, MTlstream_data)
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133
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134 static Lisp_Object mark_lstream (Lisp_Object, void (*) (Lisp_Object));
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135 static void print_lstream (Lisp_Object obj, Lisp_Object printcharfun,
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136 int escapeflag);
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137 static void finalize_lstream (void *header, int for_disksave);
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138 static unsigned int sizeof_lstream (CONST void *header);
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139 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION ("stream", lstream,
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140 mark_lstream, print_lstream,
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141 finalize_lstream, 0, 0,
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142 sizeof_lstream, Lstream);
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143
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144 #define DEFAULT_BLOCK_BUFFERING_SIZE 512
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145 #define MAX_READ_SIZE 512
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146
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147 static Lisp_Object
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148 mark_lstream (Lisp_Object obj, void (*markobj) (Lisp_Object))
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149 {
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150 Lstream *lstr = XLSTREAM (obj);
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151 if (lstr->imp->marker)
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152 return (lstr->imp->marker) (obj, markobj);
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153 else
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154 return Qnil;
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155 }
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156
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157 static void
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158 print_lstream (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
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159 {
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160 Lstream *lstr = XLSTREAM (obj);
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161 char buf[200];
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162
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163 sprintf (buf, "#<INTERNAL EMACS BUG (%s lstream) 0x%x>",
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164 lstr->imp->name, (EMACS_INT) lstr);
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165 write_c_string (buf, printcharfun);
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166 }
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167
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168 static void
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169 finalize_lstream (void *header, int for_disksave)
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170 {
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171 /* WARNING WARNING WARNING. This function (and all finalize functions)
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172 may get called more than once on the same object, and may get called
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173 (at dump time) on objects that are not being released. */
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174 Lstream *lstr = (Lstream *) header;
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175
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176 #if 0 /* this may cause weird Broken Pipes? */
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177 if (for_disksave)
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178 {
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179 Lstream_pseudo_close (lstr);
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180 return;
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181 }
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182 #endif
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183 if (lstr->flags & LSTREAM_FL_IS_OPEN)
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184 Lstream_close (lstr);
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185 }
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186
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187 static unsigned int
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188 sizeof_lstream (CONST void *header)
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189 {
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190 CONST Lstream *lstr = (CONST Lstream *) header;
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191 return sizeof (*lstr) + lstr->imp->size - 1;
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192 }
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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 = Qnil;
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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 static void
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283 signal_simple_internal_error (CONST char *reason, Lisp_Object obj)
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284 {
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70
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285 #ifdef DEBUG_XEMACS
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286 abort ();
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287 #else
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0
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288 signal_simple_error (reason, obj);
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70
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289 #endif
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0
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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 {
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297 Lisp_Object obj = Qnil;
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298 XSETLSTREAM (obj, lstr);
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299 signal_simple_internal_error
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300 ("Internal error: lstream already open", obj);
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301 }
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302 lstr->flags |= LSTREAM_FL_IS_OPEN;
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303 }
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304
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305 /* Attempt to flush out all of the buffered data for writing. */
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306
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307 int
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308 Lstream_flush_out (Lstream *lstr)
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309 {
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310 int num_written;
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311
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312 while (lstr->out_buffer_ind > 0)
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313 {
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314 int size = lstr->out_buffer_ind;
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315 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
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316 {
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317 Lisp_Object obj = Qnil;
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318 XSETLSTREAM (obj, lstr);
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319 signal_simple_internal_error
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320 ("Internal error: lstream not open", obj);
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321 }
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322 if (! (lstr->flags & LSTREAM_FL_WRITE))
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323 {
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324 Lisp_Object obj = Qnil;
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325 XSETLSTREAM (obj, lstr);
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326 signal_simple_internal_error
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327 ("Internal error: lstream not open for writing", obj);
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328 }
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329 if (!lstr->imp->writer)
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330 {
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331 Lisp_Object obj = Qnil;
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332 XSETLSTREAM (obj, lstr);
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333 signal_simple_internal_error
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334 ("Internal error: lstream has no writer", obj);
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335 }
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336
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337 if (lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS)
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338 /* It's quite possible for us to get passed an incomplete
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339 character at the end. We need to spit back that
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340 incomplete character. */
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341 {
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342 CONST unsigned char *data = lstr->out_buffer;
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343 CONST unsigned char *dataend = data + size - 1;
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344 assert (size > 0); /* safety check ... */
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345 /* Optimize the most common case. */
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346 if (!BYTE_ASCII_P (*dataend))
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347 {
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348 /* Go back to the beginning of the last (and possibly partial)
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349 character, and bump forward to see if the character is
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350 complete. */
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351 VALIDATE_CHARPTR_BACKWARD (dataend);
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352 if (dataend + REP_BYTES_BY_FIRST_BYTE (*dataend) != data + size)
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353 /* If not, chop the size down to ignore the last char
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354 and stash it away for next time. */
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355 size = dataend - data;
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356 /* If we don't even have one character to write, then just
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357 skip out. */
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358 if (size == 0)
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359 break;
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360 }
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361 }
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362
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363 num_written =
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364 (lstr->imp->writer) (lstr, lstr->out_buffer, size);
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365 if (num_written == 0)
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366 /* If nothing got written, then just hold the data. This may
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367 occur, for example, if this stream does non-blocking I/O;
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368 the attempt to write the data might have resulted in an
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369 EWOULDBLOCK error. */
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370 return 0;
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371 else if (num_written >= lstr->out_buffer_ind)
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372 lstr->out_buffer_ind = 0;
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373 else if (num_written > 0)
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374 {
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375 memmove (lstr->out_buffer, lstr->out_buffer + num_written,
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376 lstr->out_buffer_ind - num_written);
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377 lstr->out_buffer_ind -= num_written;
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378 }
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379 else
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380 /* If error, just hold the data, for similar reasons as above. */
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381 return -1;
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382 }
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383
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384 if (lstr->imp->flusher)
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385 return (lstr->imp->flusher) (lstr);
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386
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387 return 0;
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388 }
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389
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390 int
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391 Lstream_flush (Lstream *lstr)
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392 {
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393 if (Lstream_flush_out (lstr) < 0)
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394 return -1;
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395
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396 /* clear out buffered data */
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397 lstr->in_buffer_current = lstr->in_buffer_ind = 0;
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398 lstr->unget_buffer_ind = 0;
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399
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400 return 0;
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401 }
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402
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403 /* We want to add NUM characters. This function ensures that the
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|
|
404 buffer is large enough for this (per the buffering size specified
|
|
|
405 in the stream) and returns the number of characters we can
|
|
|
406 actually write. If FORCE is set, ignore the buffering size
|
|
|
407 and go ahead and make space for all the chars even if it exceeds
|
|
|
408 the buffering size. (This is used to deal with the possibility
|
|
|
409 that the stream writer might refuse to write any bytes now, e.g.
|
|
|
410 if it's getting EWOULDBLOCK errors. We have to keep stocking them
|
|
|
411 up until they can be written, so as to avoid losing data. */
|
|
|
412
|
|
|
413 static int
|
|
|
414 Lstream_adding (Lstream *lstr, int num, int force)
|
|
|
415 {
|
|
|
416 /* Compute the size that the outbuffer needs to be after the
|
|
|
417 chars are added. */
|
|
|
418 int size_needed = max (lstr->out_buffer_size,
|
|
|
419 num + lstr->out_buffer_ind);
|
|
|
420 /* Maybe chop it down so that we don't buffer more characters
|
|
|
421 than our advertised buffering size. */
|
|
|
422 if (!force)
|
|
|
423 size_needed = min (lstr->buffering_size, size_needed);
|
|
|
424 DO_REALLOC (lstr->out_buffer, lstr->out_buffer_size,
|
|
|
425 size_needed, unsigned char);
|
|
|
426 /* There might be more data buffered than the buffering size,
|
|
|
427 so make sure we don't return a negative number here. */
|
|
|
428 return max (0, min (num, size_needed - lstr->out_buffer_ind));
|
|
|
429 }
|
|
|
430
|
|
|
431 /* Like Lstream_write(), but does not handle line-buffering correctly. */
|
|
|
432
|
|
|
433 static int
|
|
|
434 Lstream_write_1 (Lstream *lstr, CONST void *data, int size)
|
|
|
435 {
|
|
|
436 CONST unsigned char *p = data;
|
|
|
437 int off = 0;
|
|
|
438 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
|
439 {
|
|
|
440 Lisp_Object obj = Qnil;
|
|
|
441 XSETLSTREAM (obj, lstr);
|
|
|
442 signal_simple_internal_error
|
|
|
443 ("Internal error: lstream not open", obj);
|
|
|
444 }
|
|
|
445 if (! (lstr->flags & LSTREAM_FL_WRITE))
|
|
|
446 {
|
|
|
447 Lisp_Object obj = Qnil;
|
|
|
448 XSETLSTREAM (obj, lstr);
|
|
|
449 signal_simple_internal_error
|
|
|
450 ("Internal error: lstream not open for writing", obj);
|
|
|
451 }
|
|
|
452 {
|
|
|
453 int couldnt_write_last_time = 0;
|
|
|
454
|
|
|
455 while (1)
|
|
|
456 {
|
|
|
457 /* Figure out how much we can add to the buffer */
|
|
|
458 int chunk = Lstream_adding (lstr, size, 0);
|
|
|
459 if (chunk == 0)
|
|
|
460 {
|
|
|
461 if (couldnt_write_last_time)
|
|
|
462 /* Ung, we ran out of space and tried to flush
|
|
|
463 the buffer, but it didn't work because the stream
|
|
|
464 writer is refusing to accept any data. So we
|
|
|
465 just have to squirrel away all the rest of the
|
|
|
466 stuff. */
|
|
|
467 chunk = Lstream_adding (lstr, size, 1);
|
|
|
468 else
|
|
|
469 couldnt_write_last_time = 1;
|
|
|
470 }
|
|
|
471 /* Do it. */
|
|
|
472 if (chunk > 0)
|
|
|
473 {
|
|
|
474 memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off, chunk);
|
|
|
475 lstr->out_buffer_ind += chunk;
|
|
|
476 lstr->byte_count += chunk;
|
|
|
477 size -= chunk;
|
|
|
478 off += chunk;
|
|
|
479 }
|
|
|
480 /* If the buffer is full and we have more to add, flush it out. */
|
|
|
481 if (size > 0)
|
|
|
482 {
|
|
|
483 if (Lstream_flush_out (lstr) < 0)
|
|
|
484 {
|
|
|
485 if (off == 0)
|
|
|
486 return -1;
|
|
|
487 else
|
|
|
488 return off;
|
|
|
489 }
|
|
|
490 }
|
|
|
491 else
|
|
|
492 break;
|
|
|
493 }
|
|
|
494 }
|
|
|
495 return off;
|
|
|
496 }
|
|
|
497
|
|
|
498 /* If the stream is not line-buffered, then we can just call
|
|
|
499 Lstream_write_1(), which writes in chunks. Otherwise, we
|
|
|
500 repeatedly call Lstream_putc(), which knows how to handle
|
|
|
501 line buffering. */
|
|
|
502
|
|
|
503 int
|
|
|
504 Lstream_write (Lstream *lstr, CONST void *data, int size)
|
|
|
505 {
|
|
|
506 int i;
|
|
|
507 CONST unsigned char *p = data;
|
|
|
508
|
|
|
509 assert (size >= 0);
|
|
|
510 if (size == 0)
|
|
|
511 return size;
|
|
|
512 if (lstr->buffering != LSTREAM_LINE_BUFFERED)
|
|
|
513 return Lstream_write_1 (lstr, data, size);
|
|
|
514 for (i = 0; i < size; i++)
|
|
|
515 {
|
|
|
516 if (Lstream_putc (lstr, p[i]) < 0)
|
|
|
517 break;
|
|
|
518 }
|
|
|
519 return i == 0 ? -1 : 0;
|
|
|
520 }
|
|
|
521
|
|
|
522 static int
|
|
|
523 Lstream_raw_read (Lstream *lstr, unsigned char *buffer, int size)
|
|
|
524 {
|
|
|
525 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
|
526 {
|
|
|
527 Lisp_Object obj = Qnil;
|
|
|
528 XSETLSTREAM (obj, lstr);
|
|
|
529 signal_simple_internal_error
|
|
|
530 ("Internal error: lstream not open", obj);
|
|
|
531 }
|
|
|
532 if (! (lstr->flags & LSTREAM_FL_READ))
|
|
|
533 {
|
|
|
534 Lisp_Object obj = Qnil;
|
|
|
535 XSETLSTREAM (obj, lstr);
|
|
|
536 signal_simple_internal_error
|
|
|
537 ("Internal error: lstream not open for reading", obj);
|
|
|
538 }
|
|
|
539 if (!lstr->imp->reader)
|
|
|
540 {
|
|
|
541 Lisp_Object obj = Qnil;
|
|
|
542 XSETLSTREAM (obj, lstr);
|
|
|
543 signal_simple_internal_error
|
|
|
544 ("Internal error: lstream has no reader", obj);
|
|
|
545 }
|
|
|
546
|
|
|
547 return (lstr->imp->reader) (lstr, buffer, size);
|
|
|
548 }
|
|
|
549
|
|
|
550 /* Assuming the buffer is empty, fill it up again. */
|
|
|
551
|
|
|
552 static int
|
|
|
553 Lstream_read_more (Lstream *lstr)
|
|
|
554 {
|
|
|
555 #if 0
|
|
|
556 int size_needed = max (1, min (MAX_READ_SIZE, lstr->buffering_size));
|
|
|
557 #else
|
|
|
558 /* If someone requested a larger buffer size, so be it! */
|
|
|
559 int size_needed = max (1, lstr->buffering_size);
|
|
|
560 #endif
|
|
|
561 int size_gotten;
|
|
|
562
|
|
|
563 DO_REALLOC (lstr->in_buffer, lstr->in_buffer_size,
|
|
|
564 size_needed, unsigned char);
|
|
|
565 size_gotten = Lstream_raw_read (lstr, lstr->in_buffer, size_needed);
|
|
|
566 lstr->in_buffer_current = max (0, size_gotten);
|
|
|
567 lstr->in_buffer_ind = 0;
|
|
|
568 return size_gotten < 0 ? -1 : size_gotten;
|
|
|
569 }
|
|
|
570
|
|
|
571 int
|
|
|
572 Lstream_read (Lstream *lstr, void *data, int size)
|
|
|
573 {
|
|
|
574 unsigned char *p = (unsigned char *) data;
|
|
|
575 int off = 0;
|
|
|
576 int chunk;
|
|
|
577 int error_occurred = 0;
|
|
|
578
|
|
|
579 assert (size >= 0);
|
|
|
580 if (size == 0)
|
|
|
581 return 0;
|
|
|
582
|
|
|
583 /* First try to get some data from the unget buffer */
|
|
|
584 chunk = min (size, lstr->unget_buffer_ind);
|
|
|
585 if (chunk > 0)
|
|
|
586 {
|
|
|
587 /* The bytes come back in reverse order. */
|
|
|
588 for (; off < chunk; off++)
|
|
|
589 p[off] = lstr->unget_buffer[--lstr->unget_buffer_ind];
|
|
|
590 lstr->byte_count += chunk;
|
|
|
591 size -= chunk;
|
|
|
592 }
|
|
|
593
|
|
|
594 while (size > 0)
|
|
|
595 {
|
|
|
596 /* Take whatever we can from the in buffer */
|
|
|
597 chunk = min (size, lstr->in_buffer_current - lstr->in_buffer_ind);
|
|
|
598 if (chunk > 0)
|
|
|
599 {
|
|
|
600 memcpy (p + off, lstr->in_buffer + lstr->in_buffer_ind, chunk);
|
|
|
601 lstr->in_buffer_ind += chunk;
|
|
|
602 lstr->byte_count += chunk;
|
|
|
603 size -= chunk;
|
|
|
604 off += chunk;
|
|
|
605 }
|
|
|
606
|
|
|
607 /* If we need some more, try to get some more from the stream's end */
|
|
|
608 if (size > 0)
|
|
|
609 {
|
|
|
610 int retval = Lstream_read_more (lstr);
|
|
|
611 if (retval < 0)
|
|
|
612 error_occurred = 1;
|
|
|
613 if (retval <= 0)
|
|
|
614 break;
|
|
|
615 }
|
|
|
616 }
|
|
|
617
|
|
|
618 /* #### Beware of OFF ending up 0. */
|
|
|
619 if ((lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS) && off > 0)
|
|
|
620 {
|
|
|
621 /* It's quite possible for us to get passed an incomplete
|
|
|
622 character at the end. We need to spit back that
|
|
|
623 incomplete character. */
|
|
|
624 CONST unsigned char *dataend = p + off - 1;
|
|
|
625 /* Optimize the most common case. */
|
|
|
626 if (!BYTE_ASCII_P (*dataend))
|
|
|
627 {
|
|
|
628 /* Go back to the beginning of the last (and possibly partial)
|
|
|
629 character, and bump forward to see if the character is
|
|
|
630 complete. */
|
|
|
631 VALIDATE_CHARPTR_BACKWARD (dataend);
|
|
|
632 if (dataend + REP_BYTES_BY_FIRST_BYTE (*dataend) != p + off)
|
|
|
633 {
|
|
|
634 int newoff = dataend - p;
|
|
|
635 /* If not, chop the size down to ignore the last char
|
|
|
636 and stash it away for next time. */
|
|
|
637 Lstream_unread (lstr, dataend, off - newoff);
|
|
|
638 off = newoff;
|
|
|
639 }
|
|
|
640 }
|
|
|
641 }
|
|
|
642
|
|
|
643 return ((off == 0 && error_occurred) ? -1 : off);
|
|
|
644 }
|
|
|
645
|
|
|
646 void
|
|
|
647 Lstream_unread (Lstream *lstr, CONST void *data, int size)
|
|
|
648 {
|
|
|
649 int i;
|
|
|
650 unsigned char *p = (unsigned char *) data;
|
|
|
651
|
|
|
652 /* Make sure buffer is big enough */
|
|
|
653
|
|
|
654 DO_REALLOC (lstr->unget_buffer, lstr->unget_buffer_size,
|
|
|
655 lstr->unget_buffer_ind + size, unsigned char);
|
|
|
656
|
|
|
657 /* Bytes have to go on in reverse order -- they are reversed
|
|
|
658 again when read back. */
|
|
|
659 for (i = size - 1; i >= 0; i--)
|
|
|
660 lstr->unget_buffer[lstr->unget_buffer_ind++] = p[i];
|
|
|
661 lstr->byte_count -= size;
|
|
|
662 }
|
|
|
663
|
|
|
664 int
|
|
|
665 Lstream_rewind (Lstream *lstr)
|
|
|
666 {
|
|
|
667 if (!lstr->imp->rewinder)
|
|
|
668 {
|
|
|
669 Lisp_Object obj = Qnil;
|
|
|
670 XSETLSTREAM (obj, lstr);
|
|
|
671 signal_simple_internal_error
|
|
|
672 ("Internal error: lstream has no rewinder", obj);
|
|
|
673 }
|
|
|
674 if (Lstream_flush (lstr) < 0)
|
|
|
675 return -1;
|
|
|
676 lstr->byte_count = 0;
|
|
|
677 return (lstr->imp->rewinder) (lstr);
|
|
|
678 }
|
|
|
679
|
|
|
680 int
|
|
|
681 Lstream_seekable_p (Lstream *lstr)
|
|
|
682 {
|
|
|
683 if (!lstr->imp->rewinder)
|
|
|
684 return 0;
|
|
|
685 if (!lstr->imp->seekable_p)
|
|
|
686 return 1;
|
|
|
687 return (lstr->imp->seekable_p) (lstr);
|
|
|
688 }
|
|
|
689
|
|
|
690 static int
|
|
|
691 Lstream_pseudo_close (Lstream *lstr)
|
|
|
692 {
|
|
74
|
693 int rc;
|
|
|
694
|
|
0
|
695 if (!lstr->flags & LSTREAM_FL_IS_OPEN)
|
|
|
696 {
|
|
|
697 Lisp_Object obj = Qnil;
|
|
|
698 XSETLSTREAM (obj, lstr);
|
|
|
699 signal_simple_internal_error
|
|
|
700 ("Internal error: lstream is not open", obj);
|
|
|
701 }
|
|
|
702
|
|
|
703 /* don't check errors here -- best not to risk file descriptor loss */
|
|
74
|
704 rc = Lstream_flush (lstr);
|
|
0
|
705
|
|
74
|
706 return rc;
|
|
0
|
707 }
|
|
|
708
|
|
|
709 int
|
|
|
710 Lstream_close (Lstream *lstr)
|
|
|
711 {
|
|
82
|
712 int rc = 0;
|
|
74
|
713
|
|
0
|
714 if (lstr->flags & LSTREAM_FL_IS_OPEN)
|
|
|
715 {
|
|
|
716 /* don't return here on error, or file descriptor leak will result. */
|
|
74
|
717 rc = Lstream_pseudo_close (lstr);
|
|
0
|
718 if (lstr->imp->closer)
|
|
|
719 {
|
|
|
720 if ((lstr->imp->closer) (lstr) < 0)
|
|
|
721 return -1;
|
|
|
722 }
|
|
|
723 }
|
|
|
724
|
|
|
725 lstr->flags &= ~LSTREAM_FL_IS_OPEN;
|
|
|
726 lstr->byte_count = 0;
|
|
|
727 /* Note that Lstream_flush() reset all the buffer indices. That way,
|
|
|
728 the next call to Lstream_putc(), Lstream_getc(), or Lstream_ungetc()
|
|
|
729 on a closed stream will call into the function equivalents, which will
|
|
|
730 cause an error. */
|
|
|
731
|
|
|
732 /* We set the pointers to 0 so that we don't lose when this function
|
|
|
733 is called more than once on the same object */
|
|
|
734 if (lstr->out_buffer)
|
|
|
735 {
|
|
|
736 xfree (lstr->out_buffer);
|
|
|
737 lstr->out_buffer = 0;
|
|
|
738 }
|
|
|
739 if (lstr->in_buffer)
|
|
|
740 {
|
|
|
741 xfree (lstr->in_buffer);
|
|
|
742 lstr->in_buffer = 0;
|
|
|
743 }
|
|
|
744 if (lstr->unget_buffer)
|
|
|
745 {
|
|
|
746 xfree (lstr->unget_buffer);
|
|
|
747 lstr->unget_buffer = 0;
|
|
|
748 }
|
|
|
749
|
|
74
|
750 return rc;
|
|
0
|
751 }
|
|
|
752
|
|
|
753 int
|
|
|
754 Lstream_fputc (Lstream *lstr, int c)
|
|
|
755 {
|
|
|
756 unsigned char ch = (unsigned char) c;
|
|
|
757 int retval = Lstream_write_1 (lstr, &ch, 1);
|
|
|
758 if (retval >= 0 && lstr->buffering == LSTREAM_LINE_BUFFERED && ch == '\n')
|
|
|
759 return Lstream_flush_out (lstr);
|
|
|
760 return retval < 0 ? -1 : 0;
|
|
|
761 }
|
|
|
762
|
|
|
763 int
|
|
|
764 Lstream_fgetc (Lstream *lstr)
|
|
|
765 {
|
|
|
766 unsigned char ch;
|
|
|
767 if (Lstream_read (lstr, &ch, 1) <= 0)
|
|
|
768 return -1;
|
|
|
769 return ch;
|
|
|
770 }
|
|
|
771
|
|
|
772 void
|
|
|
773 Lstream_fungetc (Lstream *lstr, int c)
|
|
|
774 {
|
|
|
775 unsigned char ch = (unsigned char) c;
|
|
|
776 Lstream_unread (lstr, &ch, 1);
|
|
|
777 }
|
|
|
778
|
|
|
779
|
|
|
780 /************************ some stream implementations *********************/
|
|
|
781
|
|
|
782 /*********** a stdio stream ***********/
|
|
|
783
|
|
|
784 struct stdio_stream
|
|
|
785 {
|
|
|
786 FILE *file;
|
|
|
787 int closing;
|
|
|
788 };
|
|
|
789
|
|
|
790 #define STDIO_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, stdio)
|
|
|
791
|
|
|
792 DEFINE_LSTREAM_IMPLEMENTATION ("stdio", lstream_stdio,
|
|
|
793 sizeof (struct stdio_stream));
|
|
|
794
|
|
|
795 static Lisp_Object
|
|
|
796 make_stdio_stream_1 (FILE *stream, int flags, CONST char *mode)
|
|
|
797 {
|
|
|
798 Lisp_Object obj = Qnil;
|
|
|
799 Lstream *lstr = Lstream_new (lstream_stdio, mode);
|
|
|
800 struct stdio_stream *str = STDIO_STREAM_DATA (lstr);
|
|
|
801 str->file = stream;
|
|
|
802 str->closing = flags & LSTR_CLOSING;
|
|
|
803 XSETLSTREAM (obj, lstr);
|
|
|
804 return obj;
|
|
|
805 }
|
|
|
806
|
|
|
807 Lisp_Object
|
|
|
808 make_stdio_input_stream (FILE *stream, int flags)
|
|
|
809 {
|
|
|
810 return make_stdio_stream_1 (stream, flags, "r");
|
|
|
811 }
|
|
|
812
|
|
|
813 Lisp_Object
|
|
|
814 make_stdio_output_stream (FILE *stream, int flags)
|
|
|
815 {
|
|
|
816 return make_stdio_stream_1 (stream, flags, "w");
|
|
|
817 }
|
|
|
818
|
|
|
819 static int
|
|
|
820 stdio_reader (Lstream *stream, unsigned char *data, int size)
|
|
|
821 {
|
|
|
822 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
823 size_t val = fread (data, 1, (size_t) size, str->file);
|
|
|
824 if (!val && ferror (str->file))
|
|
|
825 return -1;
|
|
|
826 return (int) val;
|
|
|
827 }
|
|
|
828
|
|
|
829 static int
|
|
|
830 stdio_writer (Lstream *stream, CONST unsigned char *data, int size)
|
|
|
831 {
|
|
|
832 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
833 size_t val = fwrite (data, 1, (size_t) size, str->file);
|
|
|
834 if (!val && ferror (str->file))
|
|
|
835 return -1;
|
|
|
836 return (int) val;
|
|
|
837 }
|
|
|
838
|
|
|
839 static int
|
|
|
840 stdio_rewinder (Lstream *stream)
|
|
|
841 {
|
|
|
842 rewind (STDIO_STREAM_DATA (stream)->file);
|
|
|
843 return 0;
|
|
|
844 }
|
|
|
845
|
|
|
846 static int
|
|
|
847 stdio_seekable_p (Lstream *stream)
|
|
|
848 {
|
|
|
849 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
850 {
|
|
|
851 struct stat lestat;
|
|
|
852
|
|
|
853 if (fstat (fileno (str->file), &lestat) < 0)
|
|
|
854 return 0;
|
|
|
855 return S_ISREG (lestat.st_mode);
|
|
|
856 }
|
|
|
857 }
|
|
|
858
|
|
|
859 static int
|
|
|
860 stdio_flusher (Lstream *stream)
|
|
|
861 {
|
|
|
862 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
863 if (stream->flags & LSTREAM_FL_WRITE)
|
|
|
864 return fflush (str->file);
|
|
|
865 else
|
|
|
866 /* call fpurge? Only exists on some systems. */
|
|
|
867 return 0;
|
|
|
868 }
|
|
|
869
|
|
|
870 static int
|
|
|
871 stdio_closer (Lstream *stream)
|
|
|
872 {
|
|
|
873 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
874 if (str->closing)
|
|
|
875 return fclose (str->file);
|
|
|
876 else
|
|
|
877 if (stream->flags & LSTREAM_FL_WRITE)
|
|
|
878 return fflush (str->file);
|
|
|
879 else
|
|
|
880 /* call fpurge? Only exists on some systems. */
|
|
|
881 return 0;
|
|
|
882 }
|
|
|
883
|
|
|
884 /*********** a file descriptor ***********/
|
|
|
885
|
|
|
886 struct filedesc_stream
|
|
|
887 {
|
|
|
888 int fd;
|
|
|
889 int pty_max_bytes;
|
|
|
890 Bufbyte eof_char;
|
|
|
891 int starting_pos;
|
|
|
892 int current_pos;
|
|
|
893 int end_pos;
|
|
|
894 int chars_sans_newline;
|
|
74
|
895 unsigned int closing :1;
|
|
|
896 unsigned int allow_quit :1;
|
|
|
897 unsigned int blocked_ok :1;
|
|
|
898 unsigned int pty_flushing :1;
|
|
|
899 unsigned int blocking_error_p :1;
|
|
0
|
900 };
|
|
|
901
|
|
|
902 #define FILEDESC_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, filedesc)
|
|
|
903
|
|
|
904 DEFINE_LSTREAM_IMPLEMENTATION ("filedesc", lstream_filedesc,
|
|
|
905 sizeof (struct filedesc_stream));
|
|
|
906
|
|
|
907 /* Make a stream that reads from or writes to a file descriptor FILEDESC.
|
|
|
908 OFFSET is the offset from the *current* file pointer that the reading
|
|
|
909 should start at. COUNT is the number of bytes to be read (it is
|
|
|
910 ignored when writing); -1 for unlimited. */
|
|
|
911 static Lisp_Object
|
|
|
912 make_filedesc_stream_1 (int filedesc, int offset, int count, int flags,
|
|
|
913 CONST char *mode)
|
|
|
914 {
|
|
|
915 Lisp_Object obj = Qnil;
|
|
|
916 Lstream *lstr = Lstream_new (lstream_filedesc, mode);
|
|
|
917 struct filedesc_stream *fstr = FILEDESC_STREAM_DATA (lstr);
|
|
|
918 fstr->fd = filedesc;
|
|
|
919 fstr->closing = !!(flags & LSTR_CLOSING);
|
|
|
920 fstr->allow_quit = !!(flags & LSTR_ALLOW_QUIT);
|
|
|
921 fstr->blocked_ok = !!(flags & LSTR_BLOCKED_OK);
|
|
|
922 fstr->pty_flushing = !!(flags & LSTR_PTY_FLUSHING);
|
|
|
923 fstr->blocking_error_p = 0;
|
|
|
924 fstr->chars_sans_newline = 0;
|
|
|
925 fstr->starting_pos = lseek (filedesc, offset, SEEK_CUR);
|
|
|
926 if (fstr->starting_pos < 0)
|
|
|
927 fstr->current_pos = 0;
|
|
|
928 else
|
|
|
929 fstr->current_pos = fstr->starting_pos;
|
|
|
930 if (count < 0)
|
|
|
931 fstr->end_pos = -1;
|
|
|
932 else
|
|
|
933 fstr->end_pos = fstr->starting_pos + count;
|
|
|
934 XSETLSTREAM (obj, lstr);
|
|
|
935 return obj;
|
|
|
936 }
|
|
|
937
|
|
|
938 Lisp_Object
|
|
|
939 make_filedesc_input_stream (int filedesc, int offset, int count, int flags)
|
|
|
940 {
|
|
|
941 return make_filedesc_stream_1 (filedesc, offset, count, flags, "r");
|
|
|
942 }
|
|
|
943
|
|
|
944 Lisp_Object
|
|
|
945 make_filedesc_output_stream (int filedesc, int offset, int count, int flags)
|
|
|
946 {
|
|
|
947 return make_filedesc_stream_1 (filedesc, offset, count, flags, "w");
|
|
|
948 }
|
|
|
949
|
|
|
950 static int
|
|
|
951 filedesc_reader (Lstream *stream, unsigned char *data, int size)
|
|
|
952 {
|
|
|
953 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
954 if (str->end_pos >= 0)
|
|
|
955 size = min (size, str->end_pos - str->current_pos);
|
|
|
956 size = (str->allow_quit ? read_allowing_quit : read) (str->fd, data, size);
|
|
|
957 if (size > 0)
|
|
|
958 str->current_pos += size;
|
|
|
959 return size;
|
|
|
960 }
|
|
|
961
|
|
|
962 static int
|
|
|
963 errno_would_block_p (int val)
|
|
|
964 {
|
|
|
965 #ifdef EWOULDBLOCK
|
|
|
966 if (val == EWOULDBLOCK)
|
|
|
967 return 1;
|
|
|
968 #endif
|
|
|
969 #ifdef EAGAIN
|
|
|
970 if (val == EAGAIN)
|
|
|
971 return 1;
|
|
|
972 #endif
|
|
|
973 return 0;
|
|
|
974 }
|
|
|
975
|
|
|
976 static int
|
|
|
977 filedesc_writer (Lstream *stream, CONST unsigned char *data, int size)
|
|
|
978 {
|
|
|
979 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
980 int retval;
|
|
|
981 int need_newline = 0;
|
|
|
982
|
|
|
983 /* This function would be simple if it were not for the blasted
|
|
|
984 PTY max-bytes stuff. Why the hell can't they just have written
|
|
|
985 the PTY drivers right so this problem doesn't exist?
|
|
|
986
|
|
|
987 Maybe all the PTY crap here should be moved into another stream
|
|
|
988 that does nothing but periodically insert EOF's as necessary. */
|
|
|
989 if (str->pty_flushing)
|
|
|
990 {
|
|
|
991 /* To make life easy, only send out one line at the most. */
|
|
|
992 CONST unsigned char *ptr;
|
|
|
993
|
|
|
994 ptr = memchr (data, '\n', size);
|
|
|
995 if (ptr)
|
|
|
996 need_newline = 1;
|
|
|
997 else
|
|
|
998 ptr = data + size;
|
|
|
999 if (ptr - data >= str->pty_max_bytes - str->chars_sans_newline)
|
|
|
1000 {
|
|
|
1001 ptr = data + str->pty_max_bytes - str->chars_sans_newline;
|
|
|
1002 need_newline = 0;
|
|
|
1003 }
|
|
|
1004 size = ptr - data;
|
|
|
1005 }
|
|
|
1006
|
|
|
1007 /**** start of non-PTY-crap ****/
|
|
|
1008 if (size > 0)
|
|
|
1009 retval = ((str->allow_quit ? write_allowing_quit : write)
|
|
|
1010 (str->fd, data, size));
|
|
|
1011 else
|
|
|
1012 retval = 0;
|
|
|
1013 if (retval < 0 && errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1014 {
|
|
|
1015 str->blocking_error_p = 1;
|
|
|
1016 return 0;
|
|
|
1017 }
|
|
|
1018 str->blocking_error_p = 0;
|
|
|
1019 if (retval < 0)
|
|
|
1020 return retval;
|
|
|
1021 /**** end non-PTY-crap ****/
|
|
|
1022
|
|
|
1023 if (str->pty_flushing)
|
|
|
1024 {
|
|
|
1025 str->chars_sans_newline += retval;
|
|
|
1026 /* Note that a newline was not among the bytes written out.
|
|
|
1027 Add to the number of non-newline bytes written out,
|
|
|
1028 and flush with an EOF if necessary. Be careful to
|
|
|
1029 keep track of write errors as we go along and look
|
|
|
1030 out for EWOULDBLOCK. */
|
|
|
1031 if (str->chars_sans_newline >= str->pty_max_bytes)
|
|
|
1032 {
|
|
|
1033 int retval2 = ((str->allow_quit ? write_allowing_quit : write)
|
|
|
1034 (str->fd, &str->eof_char, 1));
|
|
|
1035 if (retval2 > 0)
|
|
|
1036 str->chars_sans_newline = 0;
|
|
|
1037 else if (retval2 < 0)
|
|
|
1038 {
|
|
|
1039 /* Error writing the EOF char. If nothing got written,
|
|
|
1040 then treat this as an error -- either return an error
|
|
|
1041 condition or set the blocking-error flag. */
|
|
|
1042 if (retval == 0)
|
|
|
1043 {
|
|
|
1044 if (errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1045 {
|
|
|
1046 str->blocking_error_p = 1;
|
|
|
1047 return 0;
|
|
|
1048 }
|
|
|
1049 else
|
|
|
1050 return retval2;
|
|
|
1051 }
|
|
|
1052 else
|
|
|
1053 return retval;
|
|
|
1054 }
|
|
|
1055 }
|
|
|
1056 }
|
|
|
1057
|
|
|
1058 /* The need_newline flag is necessary because otherwise when the
|
|
|
1059 first byte is a newline, we'd get stuck never writing anything
|
|
|
1060 in pty-flushing mode. */
|
|
|
1061 if (need_newline)
|
|
|
1062 {
|
|
|
1063 Bufbyte nl = '\n';
|
|
|
1064 int retval2 = ((str->allow_quit ? write_allowing_quit : write)
|
|
|
1065 (str->fd, &nl, 1));
|
|
|
1066 if (retval2 > 0)
|
|
|
1067 {
|
|
|
1068 str->chars_sans_newline = 0;
|
|
|
1069 retval++;
|
|
|
1070 }
|
|
|
1071 else if (retval2 < 0)
|
|
|
1072 {
|
|
|
1073 /* Error writing the newline char. If nothing got written,
|
|
|
1074 then treat this as an error -- either return an error
|
|
|
1075 condition or set the blocking-error flag. */
|
|
|
1076 if (retval == 0)
|
|
|
1077 {
|
|
|
1078 if (errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1079 {
|
|
|
1080 str->blocking_error_p = 1;
|
|
|
1081 return 0;
|
|
|
1082 }
|
|
|
1083 else
|
|
|
1084 return retval2;
|
|
|
1085 }
|
|
|
1086 else
|
|
|
1087 return retval;
|
|
|
1088 }
|
|
|
1089 }
|
|
|
1090
|
|
|
1091 return retval;
|
|
|
1092 }
|
|
|
1093
|
|
|
1094 static int
|
|
|
1095 filedesc_rewinder (Lstream *stream)
|
|
|
1096 {
|
|
|
1097 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1098 if (str->starting_pos < 0 ||
|
|
|
1099 lseek (FILEDESC_STREAM_DATA (stream)->fd, str->starting_pos,
|
|
|
1100 SEEK_SET) == -1)
|
|
|
1101 return -1;
|
|
|
1102 else
|
|
|
1103 {
|
|
|
1104 str->current_pos = str->starting_pos;
|
|
|
1105 return 0;
|
|
|
1106 }
|
|
|
1107 }
|
|
|
1108
|
|
|
1109 static int
|
|
|
1110 filedesc_seekable_p (Lstream *stream)
|
|
|
1111 {
|
|
|
1112 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1113 if (str->starting_pos < 0)
|
|
|
1114 return 0;
|
|
|
1115 else
|
|
|
1116 {
|
|
|
1117 struct stat lestat;
|
|
|
1118
|
|
|
1119 if (fstat (str->fd, &lestat) < 0)
|
|
|
1120 return 0;
|
|
|
1121 return S_ISREG (lestat.st_mode);
|
|
|
1122 }
|
|
|
1123 }
|
|
|
1124
|
|
|
1125 static int
|
|
|
1126 filedesc_closer (Lstream *stream)
|
|
|
1127 {
|
|
|
1128 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1129 if (str->closing)
|
|
|
1130 return close (str->fd);
|
|
|
1131 else
|
|
|
1132 return 0;
|
|
|
1133 }
|
|
|
1134
|
|
|
1135 void
|
|
|
1136 filedesc_stream_set_pty_flushing (Lstream *stream, int pty_max_bytes,
|
|
|
1137 Bufbyte eof_char)
|
|
|
1138 {
|
|
|
1139 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1140 str->pty_max_bytes = pty_max_bytes;
|
|
|
1141 str->eof_char = eof_char;
|
|
|
1142 }
|
|
|
1143
|
|
|
1144 int
|
|
|
1145 filedesc_stream_was_blocked (Lstream *stream)
|
|
|
1146 {
|
|
|
1147 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1148 return str->blocking_error_p;
|
|
|
1149 }
|
|
|
1150
|
|
|
1151 /*********** read from a Lisp string ***********/
|
|
|
1152
|
|
|
1153 #define LISP_STRING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, lisp_string)
|
|
|
1154
|
|
|
1155 struct lisp_string_stream
|
|
|
1156 {
|
|
|
1157 Lisp_Object obj;
|
|
|
1158 Bytecount init_offset;
|
|
|
1159 Bytecount offset, end;
|
|
|
1160 };
|
|
|
1161
|
|
|
1162 DEFINE_LSTREAM_IMPLEMENTATION ("lisp-string", lstream_lisp_string,
|
|
|
1163 sizeof (struct lisp_string_stream));
|
|
|
1164
|
|
|
1165 Lisp_Object
|
|
|
1166 make_lisp_string_input_stream (Lisp_Object string, Bytecount offset,
|
|
|
1167 Bytecount len)
|
|
|
1168 {
|
|
|
1169 Lisp_Object obj = Qnil;
|
|
|
1170 Lstream *lstr;
|
|
|
1171 struct lisp_string_stream *str;
|
|
|
1172
|
|
|
1173 CHECK_STRING (string);
|
|
|
1174 if (len < 0)
|
|
16
|
1175 len = XSTRING_LENGTH (string) - offset;
|
|
0
|
1176 assert (offset >= 0);
|
|
|
1177 assert (len >= 0);
|
|
16
|
1178 assert (offset + len <= XSTRING_LENGTH (string));
|
|
0
|
1179
|
|
|
1180 lstr = Lstream_new (lstream_lisp_string, "r");
|
|
|
1181 str = LISP_STRING_STREAM_DATA (lstr);
|
|
|
1182 str->offset = offset;
|
|
|
1183 str->end = offset + len;
|
|
|
1184 str->init_offset = offset;
|
|
|
1185 str->obj = string;
|
|
|
1186 XSETLSTREAM (obj, lstr);
|
|
|
1187 return obj;
|
|
|
1188 }
|
|
|
1189
|
|
|
1190 static int
|
|
|
1191 lisp_string_reader (Lstream *stream, unsigned char *data, int size)
|
|
|
1192 {
|
|
|
1193 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream);
|
|
|
1194 /* Don't lose if the string shrank past us ... */
|
|
16
|
1195 Bytecount offset = min (str->offset, XSTRING_LENGTH (str->obj));
|
|
|
1196 Bufbyte *strstart = XSTRING_DATA (str->obj);
|
|
0
|
1197 Bufbyte *start = strstart + offset;
|
|
|
1198
|
|
|
1199 /* ... or if someone changed the string and we ended up in the
|
|
|
1200 middle of a character. */
|
|
|
1201 /* Being in the middle of a character is `normal' unless
|
|
|
1202 LSTREAM_NO_PARTIAL_CHARS - mrb */
|
|
|
1203 if (stream->flags & LSTREAM_FL_NO_PARTIAL_CHARS)
|
|
|
1204 VALIDATE_CHARPTR_BACKWARD (start);
|
|
|
1205 offset = start - strstart;
|
|
|
1206 size = min (size, str->end - offset);
|
|
|
1207 assert (size >= 0); /* paranoia */
|
|
|
1208 memcpy (data, start, size);
|
|
|
1209 str->offset = offset + size;
|
|
|
1210 return size;
|
|
|
1211 }
|
|
|
1212
|
|
|
1213 static int
|
|
|
1214 lisp_string_rewinder (Lstream *stream)
|
|
|
1215 {
|
|
|
1216 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream);
|
|
|
1217 int pos = str->init_offset;
|
|
|
1218 if (pos > str->end)
|
|
|
1219 pos = str->end;
|
|
|
1220 /* Don't lose if the string shrank past us ... */
|
|
16
|
1221 pos = min (pos, XSTRING_LENGTH (str->obj));
|
|
0
|
1222 /* ... or if someone changed the string and we ended up in the
|
|
|
1223 middle of a character. */
|
|
|
1224 {
|
|
16
|
1225 Bufbyte *strstart = XSTRING_DATA (str->obj);
|
|
0
|
1226 Bufbyte *start = strstart + pos;
|
|
|
1227 VALIDATE_CHARPTR_BACKWARD (start);
|
|
|
1228 pos = start - strstart;
|
|
|
1229 }
|
|
|
1230 str->offset = pos;
|
|
|
1231 return 0;
|
|
|
1232 }
|
|
|
1233
|
|
|
1234 static Lisp_Object
|
|
|
1235 lisp_string_marker (Lisp_Object stream, void (*markobj) (Lisp_Object))
|
|
|
1236 {
|
|
|
1237 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (XLSTREAM (stream));
|
|
|
1238 return str->obj;
|
|
|
1239 }
|
|
|
1240
|
|
|
1241 /*********** a fixed buffer ***********/
|
|
|
1242
|
|
|
1243 #define FIXED_BUFFER_STREAM_DATA(stream) \
|
|
|
1244 LSTREAM_TYPE_DATA (stream, fixed_buffer)
|
|
|
1245
|
|
|
1246 struct fixed_buffer_stream
|
|
|
1247 {
|
|
|
1248 CONST unsigned char *inbuf;
|
|
|
1249 unsigned char *outbuf;
|
|
|
1250 int size;
|
|
|
1251 int offset;
|
|
|
1252 };
|
|
|
1253
|
|
|
1254 DEFINE_LSTREAM_IMPLEMENTATION ("fixed-buffer", lstream_fixed_buffer,
|
|
|
1255 sizeof (struct fixed_buffer_stream));
|
|
|
1256
|
|
|
1257 Lisp_Object
|
|
|
1258 make_fixed_buffer_input_stream (CONST unsigned char *buf, int size)
|
|
|
1259 {
|
|
|
1260 Lisp_Object obj = Qnil;
|
|
|
1261 Lstream *lstr;
|
|
|
1262 struct fixed_buffer_stream *str;
|
|
|
1263
|
|
|
1264 lstr = Lstream_new (lstream_fixed_buffer, "r");
|
|
|
1265 str = FIXED_BUFFER_STREAM_DATA (lstr);
|
|
|
1266 str->inbuf = buf;
|
|
|
1267 str->size = size;
|
|
|
1268 XSETLSTREAM (obj, lstr);
|
|
|
1269 return obj;
|
|
|
1270 }
|
|
|
1271
|
|
|
1272 Lisp_Object
|
|
|
1273 make_fixed_buffer_output_stream (unsigned char *buf, int size)
|
|
|
1274 {
|
|
|
1275 Lisp_Object obj = Qnil;
|
|
|
1276 Lstream *lstr;
|
|
|
1277 struct fixed_buffer_stream *str;
|
|
|
1278
|
|
|
1279 lstr = Lstream_new (lstream_fixed_buffer, "w");
|
|
|
1280 str = FIXED_BUFFER_STREAM_DATA (lstr);
|
|
|
1281 str->outbuf = buf;
|
|
|
1282 str->size = size;
|
|
|
1283 XSETLSTREAM (obj, lstr);
|
|
|
1284 return obj;
|
|
|
1285 }
|
|
|
1286
|
|
|
1287 static int
|
|
|
1288 fixed_buffer_reader (Lstream *stream, unsigned char *data, int 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 int
|
|
|
1298 fixed_buffer_writer (Lstream *stream, CONST unsigned char *data, int size)
|
|
|
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
|
|
|
1321 CONST unsigned char *
|
|
|
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 int 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 = Qnil;
|
|
|
1355 XSETLSTREAM (obj, Lstream_new (lstream_resizing_buffer, "w"));
|
|
|
1356 return obj;
|
|
|
1357 }
|
|
|
1358
|
|
|
1359 static int
|
|
|
1360 resizing_buffer_writer (Lstream *stream, CONST unsigned char *data, int size)
|
|
|
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 = Qnil;
|
|
|
1416 XSETLSTREAM (obj, Lstream_new (lstream_dynarr, "w"));
|
|
|
1417 DYNARR_STREAM_DATA (XLSTREAM (obj))->dyn = dyn;
|
|
|
1418 return obj;
|
|
|
1419 }
|
|
|
1420
|
|
|
1421 static int
|
|
|
1422 dynarr_writer (Lstream *stream, CONST unsigned char *data, int size)
|
|
|
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,
|
|
|
1465 int flags, CONST char *mode)
|
|
|
1466 {
|
|
|
1467 Lisp_Object obj = Qnil;
|
|
|
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 = Qnil;
|
|
|
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 {
|
|
2
|
1539 Lisp_Object lstr = make_lisp_buffer_stream_1 (buf, pos, 0, flags, "wc");
|
|
0
|
1540
|
|
|
1541 Lstream_set_character_mode (XLSTREAM (lstr));
|
|
|
1542 return lstr;
|
|
|
1543 }
|
|
|
1544
|
|
|
1545 static int
|
|
|
1546 lisp_buffer_reader (Lstream *stream, unsigned char *data, int 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, 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 int
|
|
|
1604 lisp_buffer_writer (Lstream *stream, CONST unsigned char *data, int size)
|
|
|
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, void (*markobj) (Lisp_Object))
|
|
|
1640 {
|
|
|
1641 struct lisp_buffer_stream *str =
|
|
|
1642 LISP_BUFFER_STREAM_DATA (XLSTREAM (stream));
|
|
|
1643
|
|
|
1644 (markobj) (str->start);
|
|
|
1645 (markobj) (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, rewinder);
|
|
|
1673 LSTREAM_HAS_METHOD (filedesc, seekable_p);
|
|
|
1674 LSTREAM_HAS_METHOD (filedesc, closer);
|
|
|
1675
|
|
|
1676 LSTREAM_HAS_METHOD (lisp_string, reader);
|
|
|
1677 LSTREAM_HAS_METHOD (lisp_string, rewinder);
|
|
|
1678 LSTREAM_HAS_METHOD (lisp_string, marker);
|
|
|
1679
|
|
|
1680 LSTREAM_HAS_METHOD (fixed_buffer, reader);
|
|
|
1681 LSTREAM_HAS_METHOD (fixed_buffer, writer);
|
|
|
1682 LSTREAM_HAS_METHOD (fixed_buffer, rewinder);
|
|
|
1683
|
|
|
1684 LSTREAM_HAS_METHOD (resizing_buffer, writer);
|
|
|
1685 LSTREAM_HAS_METHOD (resizing_buffer, rewinder);
|
|
|
1686 LSTREAM_HAS_METHOD (resizing_buffer, closer);
|
|
|
1687
|
|
|
1688 LSTREAM_HAS_METHOD (dynarr, writer);
|
|
|
1689 LSTREAM_HAS_METHOD (dynarr, rewinder);
|
|
|
1690 LSTREAM_HAS_METHOD (dynarr, closer);
|
|
|
1691
|
|
|
1692 LSTREAM_HAS_METHOD (lisp_buffer, reader);
|
|
|
1693 LSTREAM_HAS_METHOD (lisp_buffer, writer);
|
|
|
1694 LSTREAM_HAS_METHOD (lisp_buffer, rewinder);
|
|
|
1695 LSTREAM_HAS_METHOD (lisp_buffer, marker);
|
|
|
1696 }
|
|
|
1697
|
|
|
1698 void
|
|
|
1699 vars_of_lstream (void)
|
|
|
1700 {
|
|
|
1701 int i;
|
|
|
1702
|
|
|
1703 for (i = 0; i < countof (Vlstream_free_list); i++)
|
|
|
1704 {
|
|
|
1705 Vlstream_free_list[i] = Qnil;
|
|
|
1706 staticpro (&Vlstream_free_list[i]);
|
|
|
1707 }
|
|
|
1708 }
|
