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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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788
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4 Copyright (C) 1996, 2001, 2002 Ben Wing.
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428
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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
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771
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36 /* This module provides a generic buffering stream implementation.
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428
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37 Conceptually, you send data to the stream or read data from the
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38 stream, not caring what's on the other end of the stream. The
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39 other end could be another stream, a file descriptor, a stdio
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40 stream, a fixed block of memory, a reallocating block of memory,
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41 etc. The main purpose of the stream is to provide a standard
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42 interface and to do buffering. Macros are defined to read
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43 or write characters, so the calling functions do not have to
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44 worry about blocking data together in order to achieve efficiency.
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45
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771
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46 Note that this object is called "stream" in Lisp but "lstream"
|
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428
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47 in C. The reason for this is that "stream" is too generic a name
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48 for C; too much likelihood of conflict/confusion with C++, etc. */
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49
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50 #define DEFAULT_BLOCK_BUFFERING_SIZE 512
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51 #define MAX_READ_SIZE 512
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52
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|
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53 static Lisp_Object
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54 mark_lstream (Lisp_Object obj)
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55 {
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56 Lstream *lstr = XLSTREAM (obj);
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57 return lstr->imp->marker ? (lstr->imp->marker) (obj) : Qnil;
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|
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58 }
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59
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|
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60 static void
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2286
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61 print_lstream (Lisp_Object obj, Lisp_Object printcharfun,
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62 int UNUSED (escapeflag))
|
|
428
|
63 {
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64 Lstream *lstr = XLSTREAM (obj);
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65
|
|
800
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66 write_fmt_string (printcharfun,
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67 "#<INTERNAL OBJECT (XEmacs bug?) (%s lstream) 0x%lx>",
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68 lstr->imp->name, (long) lstr);
|
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428
|
69 }
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70
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71 static void
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72 finalize_lstream (void *header, int for_disksave)
|
|
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73 {
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|
74 /* WARNING WARNING WARNING. This function (and all finalize functions)
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75 may get called more than once on the same object, and may get called
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|
76 (at dump time) on objects that are not being released. */
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77 Lstream *lstr = (Lstream *) header;
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78
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79 #if 0 /* this may cause weird Broken Pipes? */
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80 if (for_disksave)
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81 {
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82 Lstream_pseudo_close (lstr);
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83 return;
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84 }
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85 #endif
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86 if (lstr->flags & LSTREAM_FL_IS_OPEN)
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87 {
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88 if (for_disksave)
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89 {
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90 if (lstr->flags & LSTREAM_FL_CLOSE_AT_DISKSAVE)
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91 Lstream_close (lstr);
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92 }
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93 else
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94 /* Just close. */
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95 Lstream_close (lstr);
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96 }
|
|
771
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97
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98 if (!for_disksave)
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99 {
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100 if (lstr->imp->finalizer)
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101 (lstr->imp->finalizer) (lstr);
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102 }
|
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428
|
103 }
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104
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665
|
105 inline static Bytecount
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106 aligned_sizeof_lstream (Bytecount lstream_type_specific_size)
|
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456
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107 {
|
|
826
|
108 return MAX_ALIGN_SIZE (offsetof (Lstream, data) +
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109 lstream_type_specific_size);
|
|
456
|
110 }
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111
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665
|
112 static Bytecount
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442
|
113 sizeof_lstream (const void *header)
|
|
428
|
114 {
|
|
456
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115 return aligned_sizeof_lstream (((const Lstream *) header)->imp->size);
|
|
428
|
116 }
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117
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1204
|
118 static const struct memory_description lstream_implementation_description_1[]
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119 = {
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120 { XD_END }
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121 };
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122
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123 const struct sized_memory_description lstream_implementation_description = {
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124 sizeof (struct lstream_implementation),
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125 lstream_implementation_description_1
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126 };
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127
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128 static const struct sized_memory_description lstream_extra_description_map[] =
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129 {
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130 { offsetof (Lstream, imp) },
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131 { offsetof (struct lstream_implementation, extra_description) },
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132 { -1 },
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133 };
|
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134
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135 static const struct memory_description lstream_description[] =
|
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136 {
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2367
|
137 { XD_BLOCK_PTR, offsetof (Lstream, imp), 1,
|
|
2551
|
138 { &lstream_implementation_description } },
|
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2367
|
139 { XD_BLOCK_ARRAY, offsetof (Lstream, data), 1,
|
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2551
|
140 { lstream_extra_description_map } },
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|
1204
|
141 { XD_END }
|
|
|
142 };
|
|
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143
|
|
|
144 static const struct memory_description lstream_empty_extra_description_1[] =
|
|
|
145 {
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|
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146 { XD_END }
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|
|
147 };
|
|
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148
|
|
|
149 const struct sized_memory_description lstream_empty_extra_description = {
|
|
|
150 0, lstream_empty_extra_description_1
|
|
|
151 };
|
|
|
152
|
|
934
|
153 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION ("stream", lstream,
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|
|
154 0, /*dumpable-flag*/
|
|
|
155 mark_lstream, print_lstream,
|
|
1204
|
156 finalize_lstream, 0, 0,
|
|
|
157 lstream_description,
|
|
934
|
158 sizeof_lstream, Lstream);
|
|
428
|
159
|
|
771
|
160
|
|
|
161 /* Change the buffering of a stream. See lstream.h. By default the
|
|
|
162 buffering is STREAM_BLOCK_BUFFERED. */
|
|
|
163
|
|
428
|
164 void
|
|
|
165 Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering,
|
|
|
166 int buffering_size)
|
|
|
167 {
|
|
|
168 lstr->buffering = buffering;
|
|
|
169 switch (buffering)
|
|
|
170 {
|
|
|
171 case LSTREAM_UNBUFFERED:
|
|
|
172 lstr->buffering_size = 0; break;
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|
|
173 case LSTREAM_BLOCK_BUFFERED:
|
|
|
174 lstr->buffering_size = DEFAULT_BLOCK_BUFFERING_SIZE; break;
|
|
|
175 case LSTREAM_BLOCKN_BUFFERED:
|
|
|
176 lstr->buffering_size = buffering_size; break;
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|
|
177 case LSTREAM_LINE_BUFFERED:
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|
|
178 case LSTREAM_UNLIMITED:
|
|
|
179 lstr->buffering_size = INT_MAX; break;
|
|
|
180 }
|
|
|
181 }
|
|
|
182
|
|
2720
|
183 #ifndef MC_ALLOC
|
|
442
|
184 static const Lstream_implementation *lstream_types[32];
|
|
428
|
185 static Lisp_Object Vlstream_free_list[32];
|
|
|
186 static int lstream_type_count;
|
|
2720
|
187 #endif /* not MC_ALLOC */
|
|
428
|
188
|
|
771
|
189 /* Allocate and return a new Lstream. This function is not really
|
|
|
190 meant to be called directly; rather, each stream type should
|
|
|
191 provide its own stream creation function, which creates the stream
|
|
|
192 and does any other necessary creation stuff (e.g. opening a
|
|
|
193 file). */
|
|
|
194
|
|
428
|
195 Lstream *
|
|
442
|
196 Lstream_new (const Lstream_implementation *imp, const char *mode)
|
|
428
|
197 {
|
|
|
198 Lstream *p;
|
|
2720
|
199 #ifdef MC_ALLOC
|
|
|
200 p = XLSTREAM (wrap_pointer_1
|
|
|
201 (alloc_lrecord (aligned_sizeof_lstream (imp->size),
|
|
|
202 &lrecord_lstream)));
|
|
|
203 #else /* not MC_ALLOC */
|
|
428
|
204 int i;
|
|
|
205
|
|
|
206 for (i = 0; i < lstream_type_count; i++)
|
|
|
207 {
|
|
|
208 if (lstream_types[i] == imp)
|
|
|
209 break;
|
|
|
210 }
|
|
|
211
|
|
|
212 if (i == lstream_type_count)
|
|
|
213 {
|
|
|
214 assert (lstream_type_count < countof (lstream_types));
|
|
|
215 lstream_types[lstream_type_count] = imp;
|
|
|
216 Vlstream_free_list[lstream_type_count] =
|
|
456
|
217 make_lcrecord_list (aligned_sizeof_lstream (imp->size),
|
|
428
|
218 &lrecord_lstream);
|
|
|
219 lstream_type_count++;
|
|
|
220 }
|
|
|
221
|
|
1204
|
222 p = XLSTREAM (alloc_managed_lcrecord (Vlstream_free_list[i]));
|
|
2720
|
223 #endif /* not MC_ALLOC */
|
|
428
|
224 /* Zero it out, except the header. */
|
|
456
|
225 memset ((char *) p + sizeof (p->header), '\0',
|
|
|
226 aligned_sizeof_lstream (imp->size) - sizeof (p->header));
|
|
428
|
227 p->imp = imp;
|
|
|
228 Lstream_set_buffering (p, LSTREAM_BLOCK_BUFFERED, 0);
|
|
|
229 p->flags = LSTREAM_FL_IS_OPEN;
|
|
|
230
|
|
|
231 /* convert mode (one of "r", "w", "rc", "wc") to p->flags */
|
|
|
232 assert (mode[0] == 'r' || mode[0] == 'w');
|
|
|
233 assert (mode[1] == 'c' || mode[1] == '\0');
|
|
|
234 p->flags |= (mode[0] == 'r' ? LSTREAM_FL_READ : LSTREAM_FL_WRITE);
|
|
|
235 if (mode[1] == 'c')
|
|
|
236 p->flags |= LSTREAM_FL_NO_PARTIAL_CHARS;
|
|
|
237
|
|
|
238 return p;
|
|
|
239 }
|
|
|
240
|
|
771
|
241 /* Set or unset "character mode" on the stream. The basic idea is that,
|
|
|
242 assuming valid internal-format data is passing through the stream and
|
|
|
243 we're processing the data character by character, we don't want partial
|
|
|
244 characters at the end of the data. (No partial characters at the
|
|
|
245 beginning happens naturally if we eliminate partial characters at the
|
|
|
246 end and the stream is implemented correctly.)
|
|
|
247
|
|
|
248 Character mode actually has two somewhat different meanings, depending
|
|
|
249 on whether this is a read stream or write stream. If a read stream,
|
|
|
250 character mode means that data returned from calling Lstream_read() on
|
|
|
251 the stream will contain only full characters. If a write stream,
|
|
|
252 character mode means that data passed to the write method in the stream
|
|
|
253 implementation will contain only full characters. It's important to
|
|
|
254 note the non-parallelism in who should set this mode on the stream: The
|
|
|
255 *CALLER* sets character mode on read streams it creates; the *STREAM
|
|
|
256 ITSELF* sets character mode on write streams, typically at creation
|
|
814
|
257 time.
|
|
|
258
|
|
|
259 (However, if a read stream always generates internal-format data, then
|
|
|
260 the callers will almost always want character mode, and it's allowed to
|
|
|
261 set this on behalf of the caller, as long as a flag can be provided at
|
|
|
262 creation time to disable this behavior.) */
|
|
771
|
263
|
|
428
|
264 void
|
|
|
265 Lstream_set_character_mode (Lstream *lstr)
|
|
|
266 {
|
|
|
267 lstr->flags |= LSTREAM_FL_NO_PARTIAL_CHARS;
|
|
|
268 }
|
|
|
269
|
|
771
|
270 /* Unset character mode. See Lstream_set_character_mode(). */
|
|
|
271
|
|
|
272 void
|
|
|
273 Lstream_unset_character_mode (Lstream *lstr)
|
|
|
274 {
|
|
|
275 lstr->flags &= ~LSTREAM_FL_NO_PARTIAL_CHARS;
|
|
|
276 }
|
|
|
277
|
|
|
278 /* Close the stream (if it's open), and free all memory associated with the
|
|
|
279 stream. Put the stream on a free list; later calls to create a new
|
|
|
280 stream of this type may reuse this stream. Calling this is not strictly
|
|
|
281 necessary, but it is much more efficient than having the Lstream be
|
|
|
282 garbage-collected. Be VERY VERY SURE there are no pointers to this
|
|
|
283 object hanging around anywhere where they might be used! When streams
|
|
|
284 are chained together, be VERY CAREFUL of the order in which you delete
|
|
|
285 them! (e.g. if the streams are in a singly-linked list, delete the head
|
|
814
|
286 first; this will close (but check the documentation, e.g. of
|
|
|
287 make_coding_input_stream()), and may send data down to the rest. Then
|
|
771
|
288 proceed to the rest, one by one. If the chains are in a doubly-linked
|
|
|
289 list, close all the streams first (again, from the head to the tail),
|
|
|
290 disconnect the back links, then delete starting from the head. In
|
|
814
|
291 general, it's a good idea to close everything before deleting anything.
|
|
771
|
292
|
|
|
293 NOTE: DO NOT CALL DURING GARBAGE COLLECTION (e.g. in a finalizer). You
|
|
|
294 will be aborted. See free_managed_lcrecord(). */
|
|
|
295
|
|
428
|
296 void
|
|
|
297 Lstream_delete (Lstream *lstr)
|
|
|
298 {
|
|
2720
|
299 #ifndef MC_ALLOC
|
|
428
|
300 int i;
|
|
2720
|
301 #endif /* not MC_ALLOC */
|
|
793
|
302 Lisp_Object val = wrap_lstream (lstr);
|
|
428
|
303
|
|
2720
|
304 #ifdef MC_ALLOC
|
|
|
305 free_lrecord (val);
|
|
|
306 #else /* not MC_ALLOC */
|
|
428
|
307 for (i = 0; i < lstream_type_count; i++)
|
|
|
308 {
|
|
|
309 if (lstream_types[i] == lstr->imp)
|
|
|
310 {
|
|
|
311 free_managed_lcrecord (Vlstream_free_list[i], val);
|
|
|
312 return;
|
|
|
313 }
|
|
|
314 }
|
|
|
315
|
|
2500
|
316 ABORT ();
|
|
2720
|
317 #endif /* not MC_ALLOC */
|
|
428
|
318 }
|
|
|
319
|
|
|
320 #define Lstream_internal_error(reason, lstr) \
|
|
563
|
321 signal_error (Qinternal_error, reason, wrap_lstream (lstr))
|
|
428
|
322
|
|
771
|
323 /* Reopen a closed stream. This enables I/O on it again. This is not
|
|
|
324 meant to be called except from a wrapper routine that reinitializes
|
|
|
325 variables and such -- the close routine may well have freed some
|
|
|
326 necessary storage structures, for example. */
|
|
|
327
|
|
428
|
328 void
|
|
|
329 Lstream_reopen (Lstream *lstr)
|
|
|
330 {
|
|
|
331 if (lstr->flags & LSTREAM_FL_IS_OPEN)
|
|
|
332 Lstream_internal_error ("lstream already open", lstr);
|
|
|
333 lstr->flags |= LSTREAM_FL_IS_OPEN;
|
|
|
334 }
|
|
|
335
|
|
771
|
336 /* Try to write as much of DATA as possible to the stream. Return the
|
|
|
337 number of bytes written. */
|
|
428
|
338
|
|
771
|
339 static int
|
|
|
340 Lstream_really_write (Lstream *lstr, const unsigned char *data, int size)
|
|
428
|
341 {
|
|
665
|
342 Bytecount num_written;
|
|
771
|
343 const unsigned char *orig_data = data;
|
|
|
344 int error_occurred = 0;
|
|
428
|
345
|
|
771
|
346 while (size > 0)
|
|
428
|
347 {
|
|
|
348 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
|
349 Lstream_internal_error ("lstream not open", lstr);
|
|
|
350 if (! (lstr->flags & LSTREAM_FL_WRITE))
|
|
|
351 Lstream_internal_error ("lstream not open for writing", lstr);
|
|
|
352 if (!lstr->imp->writer)
|
|
|
353 Lstream_internal_error ("lstream has no writer", lstr);
|
|
|
354
|
|
|
355 if (lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS)
|
|
|
356 /* It's quite possible for us to get passed an incomplete
|
|
|
357 character at the end. We need to spit back that
|
|
|
358 incomplete character. */
|
|
|
359 {
|
|
442
|
360 const unsigned char *dataend = data + size - 1;
|
|
428
|
361 assert (size > 0); /* safety check ... */
|
|
|
362 /* Optimize the most common case. */
|
|
826
|
363 if (!byte_ascii_p (*dataend))
|
|
428
|
364 {
|
|
|
365 /* Go back to the beginning of the last (and possibly partial)
|
|
|
366 character, and bump forward to see if the character is
|
|
|
367 complete. */
|
|
867
|
368 VALIDATE_IBYTEPTR_BACKWARD (dataend);
|
|
826
|
369 if (dataend + rep_bytes_by_first_byte (*dataend) != data + size)
|
|
428
|
370 /* If not, chop the size down to ignore the last char
|
|
|
371 and stash it away for next time. */
|
|
|
372 size = dataend - data;
|
|
|
373 /* If we don't even have one character to write, then just
|
|
|
374 skip out. */
|
|
|
375 if (size == 0)
|
|
|
376 break;
|
|
|
377 }
|
|
|
378 }
|
|
|
379
|
|
771
|
380 num_written = (lstr->imp->writer) (lstr, data, size);
|
|
428
|
381 if (num_written == 0)
|
|
|
382 /* If nothing got written, then just hold the data. This may
|
|
|
383 occur, for example, if this stream does non-blocking I/O;
|
|
|
384 the attempt to write the data might have resulted in an
|
|
|
385 EWOULDBLOCK error. */
|
|
771
|
386 break;
|
|
|
387 else if (num_written > size)
|
|
2500
|
388 ABORT ();
|
|
428
|
389 else if (num_written > 0)
|
|
|
390 {
|
|
771
|
391 data += num_written;
|
|
|
392 size -= num_written;
|
|
428
|
393 }
|
|
|
394 else
|
|
771
|
395 {
|
|
|
396 /* If error, just hold the data, for similar reasons as above. */
|
|
|
397 error_occurred = 1;
|
|
|
398 break;
|
|
|
399 }
|
|
428
|
400 }
|
|
|
401
|
|
2383
|
402 if (!error_occurred && lstr->imp->flusher)
|
|
771
|
403 error_occurred = (lstr->imp->flusher) (lstr) < 0;
|
|
|
404
|
|
|
405 if (data == orig_data && error_occurred)
|
|
|
406 return -1;
|
|
|
407
|
|
|
408 return data - orig_data;
|
|
|
409 }
|
|
|
410
|
|
|
411 /* Attempt to flush out all of the buffered data for writing. Leaves
|
|
|
412 whatever wasn't flushed sitting in the stream's buffers. Return -1 if
|
|
|
413 nothing written and error occurred, 0 otherwise. */
|
|
428
|
414
|
|
771
|
415 int
|
|
|
416 Lstream_flush_out (Lstream *lstr)
|
|
|
417 {
|
|
|
418 Bytecount num_written =
|
|
|
419 Lstream_really_write (lstr, lstr->out_buffer, lstr->out_buffer_ind);
|
|
|
420 if (num_written == lstr->out_buffer_ind)
|
|
|
421 {
|
|
|
422 lstr->out_buffer_ind = 0;
|
|
|
423 return 0;
|
|
|
424 }
|
|
|
425 else if (num_written > 0)
|
|
|
426 {
|
|
|
427 memmove (lstr->out_buffer, lstr->out_buffer + num_written,
|
|
|
428 lstr->out_buffer_ind - num_written);
|
|
|
429 lstr->out_buffer_ind -= num_written;
|
|
|
430 return 0;
|
|
|
431 }
|
|
|
432 else return num_written;
|
|
428
|
433 }
|
|
|
434
|
|
771
|
435 /* Flush out any pending unwritten data in the stream. Clear any buffered
|
|
|
436 input data. This differs from Lstream_flush_out() in that it also
|
|
|
437 clears any unflushable buffered data. Returns 0 on success, -1 on
|
|
|
438 error. */
|
|
|
439
|
|
428
|
440 int
|
|
|
441 Lstream_flush (Lstream *lstr)
|
|
|
442 {
|
|
|
443 if (Lstream_flush_out (lstr) < 0)
|
|
|
444 return -1;
|
|
|
445
|
|
|
446 /* clear out buffered data */
|
|
|
447 lstr->in_buffer_current = lstr->in_buffer_ind = 0;
|
|
|
448 lstr->unget_buffer_ind = 0;
|
|
|
449
|
|
|
450 return 0;
|
|
|
451 }
|
|
|
452
|
|
|
453 /* We want to add NUM characters. This function ensures that the
|
|
|
454 buffer is large enough for this (per the buffering size specified
|
|
|
455 in the stream) and returns the number of characters we can
|
|
|
456 actually write. If FORCE is set, ignore the buffering size
|
|
|
457 and go ahead and make space for all the chars even if it exceeds
|
|
|
458 the buffering size. (This is used to deal with the possibility
|
|
|
459 that the stream writer might refuse to write any bytes now, e.g.
|
|
|
460 if it's getting EWOULDBLOCK errors. We have to keep stocking them
|
|
771
|
461 up until they can be written, so as to avoid losing data.) */
|
|
428
|
462
|
|
665
|
463 static Bytecount
|
|
|
464 Lstream_adding (Lstream *lstr, Bytecount num, int force)
|
|
428
|
465 {
|
|
665
|
466 Bytecount size = num + lstr->out_buffer_ind;
|
|
430
|
467
|
|
|
468 if (size <= lstr->out_buffer_size)
|
|
|
469 return num;
|
|
|
470
|
|
428
|
471 /* Maybe chop it down so that we don't buffer more characters
|
|
|
472 than our advertised buffering size. */
|
|
430
|
473 if ((size > lstr->buffering_size) && !force)
|
|
|
474 {
|
|
|
475 size = lstr->buffering_size;
|
|
|
476 /* There might be more data buffered than the buffering size. */
|
|
|
477 if (size <= lstr->out_buffer_ind)
|
|
|
478 return 0;
|
|
|
479 }
|
|
|
480
|
|
|
481 DO_REALLOC (lstr->out_buffer, lstr->out_buffer_size, size, unsigned char);
|
|
|
482
|
|
|
483 return size - lstr->out_buffer_ind;
|
|
428
|
484 }
|
|
|
485
|
|
|
486 /* Like Lstream_write(), but does not handle line-buffering correctly. */
|
|
|
487
|
|
771
|
488 static int
|
|
665
|
489 Lstream_write_1 (Lstream *lstr, const void *data, Bytecount size)
|
|
428
|
490 {
|
|
442
|
491 const unsigned char *p = (const unsigned char *) data;
|
|
665
|
492 Bytecount off = 0;
|
|
428
|
493 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
|
494 Lstream_internal_error ("lstream not open", lstr);
|
|
|
495 if (! (lstr->flags & LSTREAM_FL_WRITE))
|
|
|
496 Lstream_internal_error ("lstream not open for writing", lstr);
|
|
771
|
497
|
|
|
498 if (lstr->buffering == LSTREAM_UNBUFFERED)
|
|
|
499 {
|
|
|
500 /* If there is buffered data, it means we ran into blocking
|
|
|
501 errors the previous time and had to buffer our remaining
|
|
|
502 data. Try to write it now. */
|
|
|
503 if (lstr->out_buffer_ind > 0)
|
|
|
504 {
|
|
|
505 if (Lstream_flush_out (lstr) < 0)
|
|
|
506 return -1;
|
|
|
507 }
|
|
|
508
|
|
|
509 /* If not still blocked, try to write the new data */
|
|
|
510 if (lstr->out_buffer_ind == 0)
|
|
|
511 {
|
|
|
512 /* we don't need to loop because Lstream_really_write does that
|
|
|
513 for us. */
|
|
|
514 Bytecount num_written = Lstream_really_write (lstr, p, size);
|
|
|
515 if (num_written < 0)
|
|
|
516 return -1;
|
|
|
517 off += num_written;
|
|
|
518 }
|
|
|
519
|
|
|
520 /* squirrel away the rest of the data */
|
|
|
521 if (off < size)
|
|
|
522 {
|
|
|
523 Lstream_adding (lstr, size - off, 1);
|
|
|
524 memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off,
|
|
|
525 size - off);
|
|
|
526 lstr->out_buffer_ind += size - off;
|
|
|
527 }
|
|
|
528
|
|
|
529 lstr->byte_count += size;
|
|
|
530 return 0;
|
|
|
531 }
|
|
|
532 else
|
|
|
533 {
|
|
|
534 int couldnt_write_last_time = 0;
|
|
428
|
535
|
|
771
|
536 while (1)
|
|
|
537 {
|
|
|
538 /* Figure out how much we can add to the buffer */
|
|
|
539 Bytecount chunk = Lstream_adding (lstr, size, 0);
|
|
|
540 if (chunk == 0)
|
|
|
541 {
|
|
|
542 if (couldnt_write_last_time)
|
|
|
543 /* Ung, we ran out of space and tried to flush
|
|
|
544 the buffer, but it didn't work because the stream
|
|
|
545 writer is refusing to accept any data. So we
|
|
|
546 just have to squirrel away all the rest of the
|
|
|
547 stuff. */
|
|
|
548 chunk = Lstream_adding (lstr, size, 1);
|
|
|
549 else
|
|
|
550 couldnt_write_last_time = 1;
|
|
|
551 }
|
|
|
552 /* Do it. */
|
|
|
553 if (chunk > 0)
|
|
|
554 {
|
|
|
555 memcpy (lstr->out_buffer + lstr->out_buffer_ind, p + off, chunk);
|
|
|
556 lstr->out_buffer_ind += chunk;
|
|
|
557 lstr->byte_count += chunk;
|
|
|
558 size -= chunk;
|
|
|
559 off += chunk;
|
|
|
560 }
|
|
|
561 /* If the buffer is full and we have more to add, flush it out. */
|
|
|
562 if (size > 0)
|
|
|
563 {
|
|
|
564 if (Lstream_flush_out (lstr) < 0)
|
|
|
565 {
|
|
|
566 if (off == 0)
|
|
|
567 return -1;
|
|
|
568 else
|
|
|
569 return 0;
|
|
|
570 }
|
|
|
571 }
|
|
|
572 else
|
|
|
573 break;
|
|
|
574 }
|
|
|
575 }
|
|
|
576 return 0;
|
|
428
|
577 }
|
|
|
578
|
|
771
|
579 /* Write SIZE bytes of DATA to the stream. Return value is 0 on success,
|
|
|
580 -1 on error. -1 is only returned when no bytes could be written; if any
|
|
|
581 bytes could be written, then 0 is returned and any unwritten bytes are
|
|
|
582 buffered and the next call to Lstream_write() will try to write them
|
|
|
583 again. (This buffering happens even when the stream's buffering type is
|
|
|
584 LSTREAM_UNBUFFERED, and regardless of how much data is passed in or what
|
|
|
585 the stream's buffering size was set to. #### There should perhaps be a
|
|
|
586 way to control whether this happens.) */
|
|
428
|
587
|
|
771
|
588 int
|
|
665
|
589 Lstream_write (Lstream *lstr, const void *data, Bytecount size)
|
|
428
|
590 {
|
|
665
|
591 Bytecount i;
|
|
442
|
592 const unsigned char *p = (const unsigned char *) data;
|
|
428
|
593
|
|
771
|
594 /* If the stream is not line-buffered, then we can just call
|
|
|
595 Lstream_write_1(), which writes in chunks. Otherwise, we repeatedly
|
|
|
596 call Lstream_putc(), which knows how to handle line buffering.
|
|
|
597 Returns 0 on success, -1 on failure. */
|
|
|
598
|
|
428
|
599 if (size == 0)
|
|
771
|
600 return 0;
|
|
428
|
601 if (lstr->buffering != LSTREAM_LINE_BUFFERED)
|
|
|
602 return Lstream_write_1 (lstr, data, size);
|
|
|
603 for (i = 0; i < size; i++)
|
|
|
604 {
|
|
|
605 if (Lstream_putc (lstr, p[i]) < 0)
|
|
|
606 break;
|
|
|
607 }
|
|
771
|
608 return i == 0 ? -1 : 0;
|
|
428
|
609 }
|
|
|
610
|
|
|
611 int
|
|
|
612 Lstream_was_blocked_p (Lstream *lstr)
|
|
|
613 {
|
|
|
614 return lstr->imp->was_blocked_p ? lstr->imp->was_blocked_p (lstr) : 0;
|
|
|
615 }
|
|
|
616
|
|
665
|
617 static Bytecount
|
|
462
|
618 Lstream_raw_read (Lstream *lstr, unsigned char *buffer,
|
|
665
|
619 Bytecount size)
|
|
428
|
620 {
|
|
|
621 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
|
622 Lstream_internal_error ("lstream not open", lstr);
|
|
|
623 if (! (lstr->flags & LSTREAM_FL_READ))
|
|
|
624 Lstream_internal_error ("lstream not open for reading", lstr);
|
|
|
625 if (!lstr->imp->reader)
|
|
|
626 Lstream_internal_error ("lstream has no reader", lstr);
|
|
|
627
|
|
|
628 return (lstr->imp->reader) (lstr, buffer, size);
|
|
|
629 }
|
|
|
630
|
|
|
631 /* Assuming the buffer is empty, fill it up again. */
|
|
|
632
|
|
665
|
633 static Bytecount
|
|
428
|
634 Lstream_read_more (Lstream *lstr)
|
|
|
635 {
|
|
|
636 #if 0
|
|
665
|
637 Bytecount size_needed
|
|
462
|
638 = max (1, min (MAX_READ_SIZE, lstr->buffering_size));
|
|
428
|
639 #else
|
|
|
640 /* If someone requested a larger buffer size, so be it! */
|
|
665
|
641 Bytecount size_needed =
|
|
462
|
642 max (1, lstr->buffering_size);
|
|
428
|
643 #endif
|
|
665
|
644 Bytecount size_gotten;
|
|
428
|
645
|
|
|
646 DO_REALLOC (lstr->in_buffer, lstr->in_buffer_size,
|
|
|
647 size_needed, unsigned char);
|
|
|
648 size_gotten = Lstream_raw_read (lstr, lstr->in_buffer, size_needed);
|
|
|
649 lstr->in_buffer_current = max (0, size_gotten);
|
|
|
650 lstr->in_buffer_ind = 0;
|
|
|
651 return size_gotten < 0 ? -1 : size_gotten;
|
|
|
652 }
|
|
|
653
|
|
771
|
654 /* Read SIZE bytes of DATA from the stream. Return the number of bytes
|
|
|
655 read. 0 means EOF (#### sometimes; it may simply indicate we can't read
|
|
|
656 any data at other times, particularly if SIZE is too small. this needs
|
|
|
657 to be fixed!). -1 means an error occurred and no bytes were read. */
|
|
|
658
|
|
814
|
659 static Bytecount
|
|
|
660 Lstream_read_1 (Lstream *lstr, void *data, Bytecount size,
|
|
|
661 int override_no_partial_chars)
|
|
428
|
662 {
|
|
|
663 unsigned char *p = (unsigned char *) data;
|
|
665
|
664 Bytecount off = 0;
|
|
|
665 Bytecount chunk;
|
|
428
|
666 int error_occurred = 0;
|
|
|
667
|
|
|
668 if (size == 0)
|
|
|
669 return 0;
|
|
|
670
|
|
|
671 /* First try to get some data from the unget buffer */
|
|
|
672 chunk = min (size, lstr->unget_buffer_ind);
|
|
|
673 if (chunk > 0)
|
|
|
674 {
|
|
|
675 /* The bytes come back in reverse order. */
|
|
|
676 for (; off < chunk; off++)
|
|
|
677 p[off] = lstr->unget_buffer[--lstr->unget_buffer_ind];
|
|
|
678 lstr->byte_count += chunk;
|
|
|
679 size -= chunk;
|
|
|
680 }
|
|
|
681
|
|
|
682 while (size > 0)
|
|
|
683 {
|
|
771
|
684 /* If unbuffered, then simply read directly into output buffer.
|
|
|
685 No need to copy. */
|
|
|
686 if (lstr->buffering == LSTREAM_UNBUFFERED)
|
|
|
687 {
|
|
|
688 chunk = Lstream_raw_read (lstr, p + off, size);
|
|
|
689 if (chunk < 0)
|
|
|
690 error_occurred = 1;
|
|
|
691 if (chunk <= 0)
|
|
|
692 break;
|
|
|
693 lstr->byte_count += chunk;
|
|
428
|
694 size -= chunk;
|
|
771
|
695 off += chunk;
|
|
|
696 }
|
|
|
697 else
|
|
428
|
698 {
|
|
771
|
699 /* Take whatever we can from the in buffer */
|
|
|
700 chunk = min (size, lstr->in_buffer_current - lstr->in_buffer_ind);
|
|
|
701 if (chunk > 0)
|
|
|
702 {
|
|
|
703 memcpy (p + off, lstr->in_buffer + lstr->in_buffer_ind, chunk);
|
|
|
704 lstr->in_buffer_ind += chunk;
|
|
|
705 lstr->byte_count += chunk;
|
|
|
706 size -= chunk;
|
|
|
707 off += chunk;
|
|
|
708 }
|
|
|
709
|
|
|
710 /* If we need some more, try to get some more from the
|
|
|
711 stream's end */
|
|
|
712 if (size > 0)
|
|
|
713 {
|
|
|
714 Bytecount retval = Lstream_read_more (lstr);
|
|
|
715 if (retval < 0)
|
|
|
716 error_occurred = 1;
|
|
|
717 if (retval <= 0)
|
|
|
718 break;
|
|
|
719 }
|
|
428
|
720 }
|
|
|
721 }
|
|
|
722
|
|
814
|
723 if ((lstr->flags & LSTREAM_FL_NO_PARTIAL_CHARS) &&
|
|
|
724 !override_no_partial_chars)
|
|
428
|
725 {
|
|
|
726 /* It's quite possible for us to get passed an incomplete
|
|
|
727 character at the end. We need to spit back that
|
|
|
728 incomplete character. */
|
|
867
|
729 Bytecount newoff = validate_ibyte_string_backward (p, off);
|
|
771
|
730 if (newoff < off)
|
|
428
|
731 {
|
|
771
|
732 Lstream_unread (lstr, p + newoff, off - newoff);
|
|
|
733 off = newoff;
|
|
428
|
734 }
|
|
|
735 }
|
|
|
736
|
|
462
|
737 return off == 0 && error_occurred ? -1 : off;
|
|
428
|
738 }
|
|
|
739
|
|
814
|
740 Bytecount
|
|
|
741 Lstream_read (Lstream *lstr, void *data, Bytecount size)
|
|
|
742 {
|
|
|
743 return Lstream_read_1 (lstr, data, size, 0);
|
|
|
744 }
|
|
|
745
|
|
|
746
|
|
771
|
747 /* Push back SIZE bytes of DATA onto the input queue. The next call
|
|
|
748 to Lstream_read() with the same size will read the same bytes back.
|
|
|
749 Note that this will be the case even if there is other pending
|
|
|
750 unread data. */
|
|
|
751
|
|
428
|
752 void
|
|
665
|
753 Lstream_unread (Lstream *lstr, const void *data, Bytecount size)
|
|
428
|
754 {
|
|
442
|
755 const unsigned char *p = (const unsigned char *) data;
|
|
428
|
756
|
|
|
757 /* Make sure buffer is big enough */
|
|
|
758 DO_REALLOC (lstr->unget_buffer, lstr->unget_buffer_size,
|
|
|
759 lstr->unget_buffer_ind + size, unsigned char);
|
|
|
760
|
|
|
761 lstr->byte_count -= size;
|
|
|
762
|
|
|
763 /* Bytes have to go on in reverse order -- they are reversed
|
|
|
764 again when read back. */
|
|
|
765 while (size--)
|
|
|
766 lstr->unget_buffer[lstr->unget_buffer_ind++] = p[size];
|
|
|
767 }
|
|
|
768
|
|
771
|
769 /* Rewind the stream to the beginning. */
|
|
|
770
|
|
428
|
771 int
|
|
|
772 Lstream_rewind (Lstream *lstr)
|
|
|
773 {
|
|
|
774 if (!lstr->imp->rewinder)
|
|
|
775 Lstream_internal_error ("lstream has no rewinder", lstr);
|
|
|
776 if (Lstream_flush (lstr) < 0)
|
|
|
777 return -1;
|
|
|
778 lstr->byte_count = 0;
|
|
|
779 return (lstr->imp->rewinder) (lstr);
|
|
|
780 }
|
|
|
781
|
|
|
782 int
|
|
|
783 Lstream_seekable_p (Lstream *lstr)
|
|
|
784 {
|
|
|
785 if (!lstr->imp->rewinder)
|
|
|
786 return 0;
|
|
|
787 if (!lstr->imp->seekable_p)
|
|
|
788 return 1;
|
|
|
789 return (lstr->imp->seekable_p) (lstr);
|
|
|
790 }
|
|
|
791
|
|
|
792 static int
|
|
|
793 Lstream_pseudo_close (Lstream *lstr)
|
|
|
794 {
|
|
1943
|
795 if (! (lstr->flags & LSTREAM_FL_IS_OPEN))
|
|
428
|
796 Lstream_internal_error ("lstream is not open", lstr);
|
|
|
797
|
|
|
798 /* don't check errors here -- best not to risk file descriptor loss */
|
|
|
799 return Lstream_flush (lstr);
|
|
|
800 }
|
|
|
801
|
|
771
|
802 /* Close the stream. All data will be flushed out. If the stream is
|
|
|
803 already closed, nothing happens. Note that, even if all data has
|
|
|
804 already been flushed out, the act of closing a stream may generate more
|
|
|
805 data -- for example, if the stream implements some sort of conversion,
|
|
|
806 such as gzip, there may be special "end-data" that need to be written
|
|
|
807 out when the file is closed. */
|
|
|
808
|
|
428
|
809 int
|
|
|
810 Lstream_close (Lstream *lstr)
|
|
|
811 {
|
|
|
812 int rc = 0;
|
|
|
813
|
|
|
814 if (lstr->flags & LSTREAM_FL_IS_OPEN)
|
|
|
815 {
|
|
|
816 rc = Lstream_pseudo_close (lstr);
|
|
|
817 /*
|
|
|
818 * We used to return immediately if the closer method reported
|
|
|
819 * failure, leaving the stream open. But this is no good, for
|
|
|
820 * the following reasons.
|
|
|
821 *
|
|
|
822 * 1. The finalizer method used in GC makes no provision for
|
|
|
823 * failure, so we must not return without freeing buffer
|
|
|
824 * memory.
|
|
|
825 *
|
|
|
826 * 2. The closer method may have already freed some memory
|
|
|
827 * used for I/O in this stream. E.g. encoding_closer frees
|
|
|
828 * ENCODING_STREAM_DATA(stream)->runoff. If a writer method
|
|
|
829 * tries to use this buffer later, it will write into memory
|
|
|
830 * that may have been allocated elsewhere. Sometime later
|
|
|
831 * you will see a sign that says "Welcome to Crash City."
|
|
|
832 *
|
|
|
833 * 3. The closer can report failure if a flush fails in the
|
|
|
834 * other stream in a MULE encoding/decoding stream pair.
|
|
|
835 * The other stream in the pair is closed, but returning
|
|
|
836 * early leaves the current stream open. If we try to
|
|
|
837 * flush the current stream later, we will crash when the
|
|
|
838 * flusher notices that the other end stream is closed.
|
|
|
839 *
|
|
|
840 * So, we no longer abort the close if the closer method
|
|
|
841 * reports some kind of failure. We still report the failure
|
|
|
842 * to the caller.
|
|
|
843 */
|
|
|
844 if (lstr->imp->closer)
|
|
|
845 if ((lstr->imp->closer) (lstr) < 0)
|
|
|
846 rc = -1;
|
|
|
847 }
|
|
|
848
|
|
|
849 lstr->flags &= ~LSTREAM_FL_IS_OPEN;
|
|
|
850 lstr->byte_count = 0;
|
|
|
851 /* Note that Lstream_flush() reset all the buffer indices. That way,
|
|
|
852 the next call to Lstream_putc(), Lstream_getc(), or Lstream_ungetc()
|
|
|
853 on a closed stream will call into the function equivalents, which will
|
|
|
854 cause an error. */
|
|
|
855
|
|
|
856 /* We set the pointers to 0 so that we don't lose when this function
|
|
|
857 is called more than once on the same object */
|
|
|
858 if (lstr->out_buffer)
|
|
|
859 {
|
|
1726
|
860 xfree (lstr->out_buffer, unsigned char *);
|
|
428
|
861 lstr->out_buffer = 0;
|
|
|
862 }
|
|
|
863 if (lstr->in_buffer)
|
|
|
864 {
|
|
1726
|
865 xfree (lstr->in_buffer, unsigned char *);
|
|
428
|
866 lstr->in_buffer = 0;
|
|
|
867 }
|
|
|
868 if (lstr->unget_buffer)
|
|
|
869 {
|
|
1726
|
870 xfree (lstr->unget_buffer, unsigned char *);
|
|
428
|
871 lstr->unget_buffer = 0;
|
|
|
872 }
|
|
|
873
|
|
|
874 return rc;
|
|
|
875 }
|
|
|
876
|
|
771
|
877
|
|
|
878 /* Function equivalent of Lstream_putc(). */
|
|
|
879
|
|
428
|
880 int
|
|
|
881 Lstream_fputc (Lstream *lstr, int c)
|
|
|
882 {
|
|
|
883 unsigned char ch = (unsigned char) c;
|
|
771
|
884 int retval = Lstream_write_1 (lstr, &ch, 1);
|
|
|
885 if (retval == 0 && lstr->buffering == LSTREAM_LINE_BUFFERED && ch == '\n')
|
|
428
|
886 return Lstream_flush_out (lstr);
|
|
771
|
887 return retval;
|
|
428
|
888 }
|
|
|
889
|
|
771
|
890 /* Function equivalent of Lstream_getc(). */
|
|
|
891
|
|
428
|
892 int
|
|
|
893 Lstream_fgetc (Lstream *lstr)
|
|
|
894 {
|
|
|
895 unsigned char ch;
|
|
814
|
896 if (Lstream_read_1 (lstr, &ch, 1, 1) <= 0)
|
|
428
|
897 return -1;
|
|
|
898 return ch;
|
|
|
899 }
|
|
|
900
|
|
771
|
901 /* Function equivalent of Lstream_ungetc(). */
|
|
|
902
|
|
428
|
903 void
|
|
|
904 Lstream_fungetc (Lstream *lstr, int c)
|
|
|
905 {
|
|
|
906 unsigned char ch = (unsigned char) c;
|
|
|
907 Lstream_unread (lstr, &ch, 1);
|
|
|
908 }
|
|
|
909
|
|
|
910
|
|
|
911 /************************ some stream implementations *********************/
|
|
|
912
|
|
|
913 /*********** a stdio stream ***********/
|
|
|
914
|
|
|
915 struct stdio_stream
|
|
|
916 {
|
|
|
917 FILE *file;
|
|
|
918 int closing;
|
|
|
919 };
|
|
|
920
|
|
|
921 #define STDIO_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, stdio)
|
|
|
922
|
|
771
|
923 DEFINE_LSTREAM_IMPLEMENTATION ("stdio", stdio);
|
|
428
|
924
|
|
|
925 static Lisp_Object
|
|
442
|
926 make_stdio_stream_1 (FILE *stream, int flags, const char *mode)
|
|
428
|
927 {
|
|
|
928 Lstream *lstr = Lstream_new (lstream_stdio, mode);
|
|
|
929 struct stdio_stream *str = STDIO_STREAM_DATA (lstr);
|
|
|
930 str->file = stream;
|
|
|
931 str->closing = flags & LSTR_CLOSING;
|
|
|
932 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE;
|
|
793
|
933 return wrap_lstream (lstr);
|
|
428
|
934 }
|
|
|
935
|
|
|
936 Lisp_Object
|
|
|
937 make_stdio_input_stream (FILE *stream, int flags)
|
|
|
938 {
|
|
|
939 return make_stdio_stream_1 (stream, flags, "r");
|
|
|
940 }
|
|
|
941
|
|
|
942 Lisp_Object
|
|
|
943 make_stdio_output_stream (FILE *stream, int flags)
|
|
|
944 {
|
|
|
945 return make_stdio_stream_1 (stream, flags, "w");
|
|
|
946 }
|
|
|
947
|
|
|
948 /* #### From reading the Unix 98 specification, it appears that if we
|
|
|
949 want stdio_reader() to be completely correct, we should check for
|
|
|
950 0 < val < size and if so, check to see if an error has occurred.
|
|
|
951 If an error has occurred, but val is non-zero, we should go ahead
|
|
|
952 and act as if the read was successful, but remember in some fashion
|
|
|
953 or other, that an error has occurred, and report that on the next
|
|
771
|
954 call to stdio_reader instead of calling retry_fread() again.
|
|
428
|
955
|
|
771
|
956 Currently, in such a case, we end up calling retry_fread() twice and we
|
|
428
|
957 assume that
|
|
|
958
|
|
|
959 1) this is not harmful, and
|
|
|
960 2) the error will still be reported on the second read.
|
|
|
961
|
|
|
962 This is probably reasonable, so I don't think we should change this
|
|
|
963 code (it could even be argued that the error might have fixed
|
|
771
|
964 itself, so we should do the retry_fread() again. */
|
|
428
|
965
|
|
665
|
966 static Bytecount
|
|
|
967 stdio_reader (Lstream *stream, unsigned char *data, Bytecount size)
|
|
428
|
968 {
|
|
|
969 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
771
|
970 Bytecount val = retry_fread (data, 1, size, str->file);
|
|
|
971 if (!val)
|
|
|
972 {
|
|
|
973 if (ferror (str->file))
|
|
|
974 return LSTREAM_ERROR;
|
|
|
975 if (feof (str->file))
|
|
|
976 return 0; /* LSTREAM_EOF; */
|
|
|
977 }
|
|
428
|
978 return val;
|
|
|
979 }
|
|
|
980
|
|
665
|
981 static Bytecount
|
|
462
|
982 stdio_writer (Lstream *stream, const unsigned char *data,
|
|
665
|
983 Bytecount size)
|
|
428
|
984 {
|
|
|
985 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
771
|
986 Bytecount val = retry_fwrite (data, 1, size, str->file);
|
|
428
|
987 if (!val && ferror (str->file))
|
|
771
|
988 return LSTREAM_ERROR;
|
|
428
|
989 return val;
|
|
|
990 }
|
|
|
991
|
|
|
992 static int
|
|
|
993 stdio_rewinder (Lstream *stream)
|
|
|
994 {
|
|
|
995 rewind (STDIO_STREAM_DATA (stream)->file);
|
|
|
996 return 0;
|
|
|
997 }
|
|
|
998
|
|
|
999 static int
|
|
|
1000 stdio_seekable_p (Lstream *stream)
|
|
|
1001 {
|
|
|
1002 struct stat lestat;
|
|
|
1003 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
1004
|
|
771
|
1005 if (qxe_fstat (fileno (str->file), &lestat) < 0)
|
|
428
|
1006 return 0;
|
|
|
1007 return S_ISREG (lestat.st_mode);
|
|
|
1008 }
|
|
|
1009
|
|
|
1010 static int
|
|
|
1011 stdio_flusher (Lstream *stream)
|
|
|
1012 {
|
|
|
1013 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
1014 if (stream->flags & LSTREAM_FL_WRITE)
|
|
|
1015 return fflush (str->file);
|
|
|
1016 else
|
|
|
1017 return 0;
|
|
|
1018 }
|
|
|
1019
|
|
|
1020 static int
|
|
|
1021 stdio_closer (Lstream *stream)
|
|
|
1022 {
|
|
|
1023 struct stdio_stream *str = STDIO_STREAM_DATA (stream);
|
|
|
1024 if (str->closing)
|
|
771
|
1025 return retry_fclose (str->file);
|
|
428
|
1026 else
|
|
|
1027 if (stream->flags & LSTREAM_FL_WRITE)
|
|
|
1028 return fflush (str->file);
|
|
|
1029 else
|
|
|
1030 return 0;
|
|
|
1031 }
|
|
|
1032
|
|
|
1033 /*********** a file descriptor ***********/
|
|
|
1034
|
|
|
1035 struct filedesc_stream
|
|
|
1036 {
|
|
|
1037 int fd;
|
|
|
1038 int pty_max_bytes;
|
|
867
|
1039 Ibyte eof_char;
|
|
428
|
1040 int starting_pos;
|
|
|
1041 int current_pos;
|
|
|
1042 int end_pos;
|
|
|
1043 int chars_sans_newline;
|
|
|
1044 unsigned int closing :1;
|
|
|
1045 unsigned int allow_quit :1;
|
|
|
1046 unsigned int blocked_ok :1;
|
|
|
1047 unsigned int pty_flushing :1;
|
|
|
1048 unsigned int blocking_error_p :1;
|
|
|
1049 };
|
|
|
1050
|
|
|
1051 #define FILEDESC_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, filedesc)
|
|
|
1052
|
|
771
|
1053 DEFINE_LSTREAM_IMPLEMENTATION ("filedesc", filedesc);
|
|
428
|
1054
|
|
|
1055 /* Make a stream that reads from or writes to a file descriptor FILEDESC.
|
|
|
1056 OFFSET is the offset from the *current* file pointer that the reading
|
|
|
1057 should start at. COUNT is the number of bytes to be read (it is
|
|
|
1058 ignored when writing); -1 for unlimited. */
|
|
|
1059 static Lisp_Object
|
|
|
1060 make_filedesc_stream_1 (int filedesc, int offset, int count, int flags,
|
|
442
|
1061 const char *mode)
|
|
428
|
1062 {
|
|
|
1063 Lstream *lstr = Lstream_new (lstream_filedesc, mode);
|
|
|
1064 struct filedesc_stream *fstr = FILEDESC_STREAM_DATA (lstr);
|
|
|
1065 fstr->fd = filedesc;
|
|
|
1066 fstr->closing = !!(flags & LSTR_CLOSING);
|
|
|
1067 fstr->allow_quit = !!(flags & LSTR_ALLOW_QUIT);
|
|
|
1068 fstr->blocked_ok = !!(flags & LSTR_BLOCKED_OK);
|
|
|
1069 fstr->pty_flushing = !!(flags & LSTR_PTY_FLUSHING);
|
|
|
1070 fstr->blocking_error_p = 0;
|
|
|
1071 fstr->chars_sans_newline = 0;
|
|
|
1072 fstr->starting_pos = lseek (filedesc, offset, SEEK_CUR);
|
|
|
1073 fstr->current_pos = max (fstr->starting_pos, 0);
|
|
|
1074 if (count < 0)
|
|
|
1075 fstr->end_pos = -1;
|
|
|
1076 else
|
|
|
1077 fstr->end_pos = fstr->starting_pos + count;
|
|
|
1078 lstr->flags |= LSTREAM_FL_CLOSE_AT_DISKSAVE;
|
|
793
|
1079 return wrap_lstream (lstr);
|
|
428
|
1080 }
|
|
|
1081
|
|
814
|
1082 /* Flags:
|
|
|
1083
|
|
|
1084 LSTR_CLOSING
|
|
|
1085 If set, close the descriptor or FILE * when the stream is closed.
|
|
|
1086
|
|
|
1087 LSTR_ALLOW_QUIT
|
|
|
1088 If set, allow quitting out of the actual I/O.
|
|
|
1089
|
|
|
1090 LSTR_PTY_FLUSHING
|
|
|
1091 If set and filedesc_stream_set_pty_flushing() has been called
|
|
|
1092 on the stream, do not send more than pty_max_bytes on a single
|
|
|
1093 line without flushing the data out using the eof_char.
|
|
|
1094
|
|
|
1095 LSTR_BLOCKED_OK
|
|
|
1096 If set, an EWOULDBLOCK error is not treated as an error but
|
|
|
1097 simply causes the write function to return 0 as the number
|
|
|
1098 of bytes written out.
|
|
|
1099 */
|
|
|
1100
|
|
428
|
1101 Lisp_Object
|
|
|
1102 make_filedesc_input_stream (int filedesc, int offset, int count, int flags)
|
|
|
1103 {
|
|
|
1104 return make_filedesc_stream_1 (filedesc, offset, count, flags, "r");
|
|
|
1105 }
|
|
|
1106
|
|
|
1107 Lisp_Object
|
|
|
1108 make_filedesc_output_stream (int filedesc, int offset, int count, int flags)
|
|
|
1109 {
|
|
|
1110 return make_filedesc_stream_1 (filedesc, offset, count, flags, "w");
|
|
|
1111 }
|
|
|
1112
|
|
665
|
1113 static Bytecount
|
|
|
1114 filedesc_reader (Lstream *stream, unsigned char *data, Bytecount size)
|
|
428
|
1115 {
|
|
665
|
1116 Bytecount nread;
|
|
428
|
1117 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1118 if (str->end_pos >= 0)
|
|
665
|
1119 size = min (size, (Bytecount) (str->end_pos - str->current_pos));
|
|
430
|
1120 nread = str->allow_quit ?
|
|
|
1121 read_allowing_quit (str->fd, data, size) :
|
|
771
|
1122 retry_read (str->fd, data, size);
|
|
428
|
1123 if (nread > 0)
|
|
|
1124 str->current_pos += nread;
|
|
771
|
1125 if (nread == 0)
|
|
|
1126 return 0; /* LSTREAM_EOF; */
|
|
|
1127 if (nread < 0)
|
|
|
1128 return LSTREAM_ERROR;
|
|
428
|
1129 return nread;
|
|
|
1130 }
|
|
|
1131
|
|
|
1132 static int
|
|
|
1133 errno_would_block_p (int val)
|
|
|
1134 {
|
|
|
1135 #ifdef EWOULDBLOCK
|
|
|
1136 if (val == EWOULDBLOCK)
|
|
|
1137 return 1;
|
|
|
1138 #endif
|
|
|
1139 #ifdef EAGAIN
|
|
|
1140 if (val == EAGAIN)
|
|
|
1141 return 1;
|
|
|
1142 #endif
|
|
|
1143 return 0;
|
|
|
1144 }
|
|
|
1145
|
|
665
|
1146 static Bytecount
|
|
462
|
1147 filedesc_writer (Lstream *stream, const unsigned char *data,
|
|
665
|
1148 Bytecount size)
|
|
428
|
1149 {
|
|
|
1150 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
665
|
1151 Bytecount retval;
|
|
428
|
1152 int need_newline = 0;
|
|
|
1153
|
|
|
1154 /* This function would be simple if it were not for the blasted
|
|
|
1155 PTY max-bytes stuff. Why the hell can't they just have written
|
|
|
1156 the PTY drivers right so this problem doesn't exist?
|
|
|
1157
|
|
|
1158 Maybe all the PTY crap here should be moved into another stream
|
|
|
1159 that does nothing but periodically insert EOF's as necessary. */
|
|
|
1160 if (str->pty_flushing)
|
|
|
1161 {
|
|
|
1162 /* To make life easy, only send out one line at the most. */
|
|
442
|
1163 const unsigned char *ptr;
|
|
428
|
1164
|
|
442
|
1165 ptr = (const unsigned char *) memchr (data, '\n', size);
|
|
428
|
1166 if (ptr)
|
|
|
1167 need_newline = 1;
|
|
|
1168 else
|
|
|
1169 ptr = data + size;
|
|
|
1170 if (ptr - data >= str->pty_max_bytes - str->chars_sans_newline)
|
|
|
1171 {
|
|
|
1172 ptr = data + str->pty_max_bytes - str->chars_sans_newline;
|
|
|
1173 need_newline = 0;
|
|
|
1174 }
|
|
|
1175 size = ptr - data;
|
|
|
1176 }
|
|
|
1177
|
|
|
1178 /**** start of non-PTY-crap ****/
|
|
|
1179 if (size > 0)
|
|
430
|
1180 retval = str->allow_quit ?
|
|
|
1181 write_allowing_quit (str->fd, data, size) :
|
|
771
|
1182 retry_write (str->fd, data, size);
|
|
428
|
1183 else
|
|
|
1184 retval = 0;
|
|
|
1185 if (retval < 0 && errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1186 {
|
|
|
1187 str->blocking_error_p = 1;
|
|
|
1188 return 0;
|
|
|
1189 }
|
|
|
1190 str->blocking_error_p = 0;
|
|
|
1191 if (retval < 0)
|
|
771
|
1192 return LSTREAM_ERROR;
|
|
428
|
1193 /**** end non-PTY-crap ****/
|
|
|
1194
|
|
|
1195 if (str->pty_flushing)
|
|
|
1196 {
|
|
|
1197 str->chars_sans_newline += retval;
|
|
|
1198 /* Note that a newline was not among the bytes written out.
|
|
|
1199 Add to the number of non-newline bytes written out,
|
|
|
1200 and flush with an EOF if necessary. Be careful to
|
|
|
1201 keep track of write errors as we go along and look
|
|
|
1202 out for EWOULDBLOCK. */
|
|
|
1203 if (str->chars_sans_newline >= str->pty_max_bytes)
|
|
|
1204 {
|
|
665
|
1205 Bytecount retval2 = str->allow_quit ?
|
|
430
|
1206 write_allowing_quit (str->fd, &str->eof_char, 1) :
|
|
771
|
1207 retry_write (str->fd, &str->eof_char, 1);
|
|
430
|
1208
|
|
428
|
1209 if (retval2 > 0)
|
|
|
1210 str->chars_sans_newline = 0;
|
|
|
1211 else if (retval2 < 0)
|
|
|
1212 {
|
|
|
1213 /* Error writing the EOF char. If nothing got written,
|
|
|
1214 then treat this as an error -- either return an error
|
|
|
1215 condition or set the blocking-error flag. */
|
|
|
1216 if (retval == 0)
|
|
|
1217 {
|
|
|
1218 if (errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1219 {
|
|
|
1220 str->blocking_error_p = 1;
|
|
|
1221 return 0;
|
|
|
1222 }
|
|
|
1223 else
|
|
771
|
1224 return LSTREAM_ERROR;
|
|
428
|
1225 }
|
|
|
1226 else
|
|
|
1227 return retval;
|
|
|
1228 }
|
|
|
1229 }
|
|
|
1230 }
|
|
|
1231
|
|
|
1232 /* The need_newline flag is necessary because otherwise when the
|
|
|
1233 first byte is a newline, we'd get stuck never writing anything
|
|
|
1234 in pty-flushing mode. */
|
|
|
1235 if (need_newline)
|
|
|
1236 {
|
|
867
|
1237 Ibyte nl = '\n';
|
|
665
|
1238 Bytecount retval2 = str->allow_quit ?
|
|
430
|
1239 write_allowing_quit (str->fd, &nl, 1) :
|
|
771
|
1240 retry_write (str->fd, &nl, 1);
|
|
430
|
1241
|
|
428
|
1242 if (retval2 > 0)
|
|
|
1243 {
|
|
|
1244 str->chars_sans_newline = 0;
|
|
|
1245 retval++;
|
|
|
1246 }
|
|
|
1247 else if (retval2 < 0)
|
|
|
1248 {
|
|
|
1249 /* Error writing the newline char. If nothing got written,
|
|
|
1250 then treat this as an error -- either return an error
|
|
|
1251 condition or set the blocking-error flag. */
|
|
|
1252 if (retval == 0)
|
|
|
1253 {
|
|
|
1254 if (errno_would_block_p (errno) && str->blocked_ok)
|
|
|
1255 {
|
|
|
1256 str->blocking_error_p = 1;
|
|
|
1257 return 0;
|
|
|
1258 }
|
|
|
1259 else
|
|
771
|
1260 return LSTREAM_ERROR;
|
|
428
|
1261 }
|
|
|
1262 else
|
|
|
1263 return retval;
|
|
|
1264 }
|
|
|
1265 }
|
|
|
1266
|
|
|
1267 return retval;
|
|
|
1268 }
|
|
|
1269
|
|
|
1270 static int
|
|
|
1271 filedesc_rewinder (Lstream *stream)
|
|
|
1272 {
|
|
|
1273 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1274 if (str->starting_pos < 0 ||
|
|
|
1275 lseek (FILEDESC_STREAM_DATA (stream)->fd, str->starting_pos,
|
|
|
1276 SEEK_SET) == -1)
|
|
|
1277 return -1;
|
|
|
1278 else
|
|
|
1279 {
|
|
|
1280 str->current_pos = str->starting_pos;
|
|
|
1281 return 0;
|
|
|
1282 }
|
|
|
1283 }
|
|
|
1284
|
|
|
1285 static int
|
|
|
1286 filedesc_seekable_p (Lstream *stream)
|
|
|
1287 {
|
|
|
1288 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1289 if (str->starting_pos < 0)
|
|
|
1290 return 0;
|
|
|
1291 else
|
|
|
1292 {
|
|
|
1293 struct stat lestat;
|
|
|
1294
|
|
771
|
1295 if (qxe_fstat (str->fd, &lestat) < 0)
|
|
428
|
1296 return 0;
|
|
|
1297 return S_ISREG (lestat.st_mode);
|
|
|
1298 }
|
|
|
1299 }
|
|
|
1300
|
|
|
1301 static int
|
|
|
1302 filedesc_closer (Lstream *stream)
|
|
|
1303 {
|
|
|
1304 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1305 if (str->closing)
|
|
771
|
1306 return retry_close (str->fd);
|
|
428
|
1307 else
|
|
|
1308 return 0;
|
|
|
1309 }
|
|
|
1310
|
|
|
1311 static int
|
|
|
1312 filedesc_was_blocked_p (Lstream *stream)
|
|
|
1313 {
|
|
|
1314 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1315 return str->blocking_error_p;
|
|
|
1316 }
|
|
|
1317
|
|
|
1318 void
|
|
|
1319 filedesc_stream_set_pty_flushing (Lstream *stream, int pty_max_bytes,
|
|
867
|
1320 Ibyte eof_char)
|
|
428
|
1321 {
|
|
|
1322 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1323 str->pty_max_bytes = pty_max_bytes;
|
|
|
1324 str->eof_char = eof_char;
|
|
|
1325 str->pty_flushing = 1;
|
|
|
1326 }
|
|
|
1327
|
|
|
1328 int
|
|
|
1329 filedesc_stream_fd (Lstream *stream)
|
|
|
1330 {
|
|
|
1331 struct filedesc_stream *str = FILEDESC_STREAM_DATA (stream);
|
|
|
1332 return str->fd;
|
|
|
1333 }
|
|
|
1334
|
|
|
1335 /*********** read from a Lisp string ***********/
|
|
|
1336
|
|
|
1337 #define LISP_STRING_STREAM_DATA(stream) LSTREAM_TYPE_DATA (stream, lisp_string)
|
|
|
1338
|
|
|
1339 struct lisp_string_stream
|
|
|
1340 {
|
|
|
1341 Lisp_Object obj;
|
|
|
1342 Bytecount init_offset;
|
|
|
1343 Bytecount offset, end;
|
|
|
1344 };
|
|
|
1345
|
|
1204
|
1346 static const struct memory_description lisp_string_lstream_description[] = {
|
|
|
1347 { XD_LISP_OBJECT, offsetof (struct lisp_string_stream, obj) },
|
|
|
1348 { XD_END }
|
|
|
1349 };
|
|
|
1350
|
|
|
1351 DEFINE_LSTREAM_IMPLEMENTATION_WITH_DATA ("lisp-string", lisp_string);
|
|
428
|
1352
|
|
|
1353 Lisp_Object
|
|
|
1354 make_lisp_string_input_stream (Lisp_Object string, Bytecount offset,
|
|
|
1355 Bytecount len)
|
|
|
1356 {
|
|
|
1357 Lstream *lstr;
|
|
|
1358 struct lisp_string_stream *str;
|
|
|
1359
|
|
|
1360 CHECK_STRING (string);
|
|
|
1361 if (len < 0)
|
|
|
1362 len = XSTRING_LENGTH (string) - offset;
|
|
|
1363 assert (offset >= 0);
|
|
|
1364 assert (len >= 0);
|
|
|
1365 assert (offset + len <= XSTRING_LENGTH (string));
|
|
|
1366
|
|
|
1367 lstr = Lstream_new (lstream_lisp_string, "r");
|
|
|
1368 str = LISP_STRING_STREAM_DATA (lstr);
|
|
|
1369 str->offset = offset;
|
|
|
1370 str->end = offset + len;
|
|
|
1371 str->init_offset = offset;
|
|
|
1372 str->obj = string;
|
|
793
|
1373 return wrap_lstream (lstr);
|
|
428
|
1374 }
|
|
|
1375
|
|
665
|
1376 static Bytecount
|
|
462
|
1377 lisp_string_reader (Lstream *stream, unsigned char *data,
|
|
665
|
1378 Bytecount size)
|
|
428
|
1379 {
|
|
|
1380 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream);
|
|
|
1381 /* Don't lose if the string shrank past us ... */
|
|
|
1382 Bytecount offset = min (str->offset, XSTRING_LENGTH (str->obj));
|
|
867
|
1383 Ibyte *strstart = XSTRING_DATA (str->obj);
|
|
|
1384 Ibyte *start = strstart + offset;
|
|
428
|
1385
|
|
|
1386 /* ... or if someone changed the string and we ended up in the
|
|
|
1387 middle of a character. */
|
|
|
1388 /* Being in the middle of a character is `normal' unless
|
|
|
1389 LSTREAM_NO_PARTIAL_CHARS - mrb */
|
|
|
1390 if (stream->flags & LSTREAM_FL_NO_PARTIAL_CHARS)
|
|
867
|
1391 VALIDATE_IBYTEPTR_BACKWARD (start);
|
|
428
|
1392 offset = start - strstart;
|
|
665
|
1393 size = min (size, (Bytecount) (str->end - offset));
|
|
428
|
1394 memcpy (data, start, size);
|
|
|
1395 str->offset = offset + size;
|
|
|
1396 return size;
|
|
|
1397 }
|
|
|
1398
|
|
|
1399 static int
|
|
|
1400 lisp_string_rewinder (Lstream *stream)
|
|
|
1401 {
|
|
|
1402 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (stream);
|
|
|
1403 int pos = str->init_offset;
|
|
|
1404 if (pos > str->end)
|
|
|
1405 pos = str->end;
|
|
|
1406 /* Don't lose if the string shrank past us ... */
|
|
|
1407 pos = min (pos, XSTRING_LENGTH (str->obj));
|
|
|
1408 /* ... or if someone changed the string and we ended up in the
|
|
|
1409 middle of a character. */
|
|
|
1410 {
|
|
867
|
1411 Ibyte *strstart = XSTRING_DATA (str->obj);
|
|
|
1412 Ibyte *start = strstart + pos;
|
|
|
1413 VALIDATE_IBYTEPTR_BACKWARD (start);
|
|
428
|
1414 pos = start - strstart;
|
|
|
1415 }
|
|
|
1416 str->offset = pos;
|
|
|
1417 return 0;
|
|
|
1418 }
|
|
|
1419
|
|
|
1420 static Lisp_Object
|
|
|
1421 lisp_string_marker (Lisp_Object stream)
|
|
|
1422 {
|
|
|
1423 struct lisp_string_stream *str = LISP_STRING_STREAM_DATA (XLSTREAM (stream));
|
|
|
1424 return str->obj;
|
|
|
1425 }
|
|
|
1426
|
|
|
1427 /*********** a fixed buffer ***********/
|
|
|
1428
|
|
|
1429 #define FIXED_BUFFER_STREAM_DATA(stream) \
|
|
|
1430 LSTREAM_TYPE_DATA (stream, fixed_buffer)
|
|
|
1431
|
|
|
1432 struct fixed_buffer_stream
|
|
|
1433 {
|
|
442
|
1434 const unsigned char *inbuf;
|
|
428
|
1435 unsigned char *outbuf;
|
|
665
|
1436 Bytecount size;
|
|
|
1437 Bytecount offset;
|
|
428
|
1438 };
|
|
|
1439
|
|
771
|
1440 DEFINE_LSTREAM_IMPLEMENTATION ("fixed-buffer", fixed_buffer);
|
|
428
|
1441
|
|
|
1442 Lisp_Object
|
|
665
|
1443 make_fixed_buffer_input_stream (const void *buf, Bytecount size)
|
|
428
|
1444 {
|
|
|
1445 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "r");
|
|
|
1446 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr);
|
|
440
|
1447 str->inbuf = (const unsigned char *) buf;
|
|
428
|
1448 str->size = size;
|
|
793
|
1449 return wrap_lstream (lstr);
|
|
428
|
1450 }
|
|
|
1451
|
|
|
1452 Lisp_Object
|
|
665
|
1453 make_fixed_buffer_output_stream (void *buf, Bytecount size)
|
|
428
|
1454 {
|
|
|
1455 Lstream *lstr = Lstream_new (lstream_fixed_buffer, "w");
|
|
|
1456 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (lstr);
|
|
440
|
1457 str->outbuf = (unsigned char *) buf;
|
|
428
|
1458 str->size = size;
|
|
793
|
1459 return wrap_lstream (lstr);
|
|
428
|
1460 }
|
|
|
1461
|
|
665
|
1462 static Bytecount
|
|
462
|
1463 fixed_buffer_reader (Lstream *stream, unsigned char *data,
|
|
665
|
1464 Bytecount size)
|
|
428
|
1465 {
|
|
|
1466 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream);
|
|
|
1467 size = min (size, str->size - str->offset);
|
|
|
1468 memcpy (data, str->inbuf + str->offset, size);
|
|
|
1469 str->offset += size;
|
|
|
1470 return size;
|
|
|
1471 }
|
|
|
1472
|
|
665
|
1473 static Bytecount
|
|
462
|
1474 fixed_buffer_writer (Lstream *stream, const unsigned char *data,
|
|
665
|
1475 Bytecount size)
|
|
428
|
1476 {
|
|
|
1477 struct fixed_buffer_stream *str = FIXED_BUFFER_STREAM_DATA (stream);
|
|
|
1478 if (str->offset == str->size)
|
|
|
1479 {
|
|
|
1480 /* If we're at the end, just throw away the data and pretend
|
|
|
1481 we wrote all of it. If we return 0, then the lstream routines
|
|
|
1482 will try again and again to write it out. */
|
|
|
1483 return size;
|
|
|
1484 }
|
|
|
1485 size = min (size, str->size - str->offset);
|
|
|
1486 memcpy (str->outbuf + str->offset, data, size);
|
|
|
1487 str->offset += size;
|
|
|
1488 return size;
|
|
|
1489 }
|
|
|
1490
|
|
|
1491 static int
|
|
|
1492 fixed_buffer_rewinder (Lstream *stream)
|
|
|
1493 {
|
|
|
1494 FIXED_BUFFER_STREAM_DATA (stream)->offset = 0;
|
|
|
1495 return 0;
|
|
|
1496 }
|
|
|
1497
|
|
442
|
1498 const unsigned char *
|
|
428
|
1499 fixed_buffer_input_stream_ptr (Lstream *stream)
|
|
|
1500 {
|
|
|
1501 assert (stream->imp == lstream_fixed_buffer);
|
|
|
1502 return FIXED_BUFFER_STREAM_DATA (stream)->inbuf;
|
|
|
1503 }
|
|
|
1504
|
|
|
1505 unsigned char *
|
|
|
1506 fixed_buffer_output_stream_ptr (Lstream *stream)
|
|
|
1507 {
|
|
|
1508 assert (stream->imp == lstream_fixed_buffer);
|
|
|
1509 return FIXED_BUFFER_STREAM_DATA (stream)->outbuf;
|
|
|
1510 }
|
|
|
1511
|
|
|
1512 /*********** write to a resizing buffer ***********/
|
|
|
1513
|
|
|
1514 #define RESIZING_BUFFER_STREAM_DATA(stream) \
|
|
|
1515 LSTREAM_TYPE_DATA (stream, resizing_buffer)
|
|
|
1516
|
|
|
1517 struct resizing_buffer_stream
|
|
|
1518 {
|
|
|
1519 unsigned char *buf;
|
|
665
|
1520 Bytecount allocked;
|
|
428
|
1521 int max_stored;
|
|
|
1522 int stored;
|
|
|
1523 };
|
|
|
1524
|
|
771
|
1525 DEFINE_LSTREAM_IMPLEMENTATION ("resizing-buffer", resizing_buffer);
|
|
428
|
1526
|
|
|
1527 Lisp_Object
|
|
|
1528 make_resizing_buffer_output_stream (void)
|
|
|
1529 {
|
|
793
|
1530 return wrap_lstream (Lstream_new (lstream_resizing_buffer, "w"));
|
|
428
|
1531 }
|
|
|
1532
|
|
665
|
1533 static Bytecount
|
|
462
|
1534 resizing_buffer_writer (Lstream *stream, const unsigned char *data,
|
|
665
|
1535 Bytecount size)
|
|
428
|
1536 {
|
|
|
1537 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream);
|
|
|
1538 DO_REALLOC (str->buf, str->allocked, str->stored + size, unsigned char);
|
|
|
1539 memcpy (str->buf + str->stored, data, size);
|
|
|
1540 str->stored += size;
|
|
|
1541 str->max_stored = max (str->max_stored, str->stored);
|
|
|
1542 return size;
|
|
|
1543 }
|
|
|
1544
|
|
|
1545 static int
|
|
|
1546 resizing_buffer_rewinder (Lstream *stream)
|
|
|
1547 {
|
|
|
1548 RESIZING_BUFFER_STREAM_DATA (stream)->stored = 0;
|
|
|
1549 return 0;
|
|
|
1550 }
|
|
|
1551
|
|
|
1552 static int
|
|
|
1553 resizing_buffer_closer (Lstream *stream)
|
|
|
1554 {
|
|
|
1555 struct resizing_buffer_stream *str = RESIZING_BUFFER_STREAM_DATA (stream);
|
|
|
1556 if (str->buf)
|
|
|
1557 {
|
|
1726
|
1558 xfree (str->buf, unsigned char *);
|
|
428
|
1559 str->buf = 0;
|
|
|
1560 }
|
|
|
1561 return 0;
|
|
|
1562 }
|
|
|
1563
|
|
|
1564 unsigned char *
|
|
|
1565 resizing_buffer_stream_ptr (Lstream *stream)
|
|
|
1566 {
|
|
|
1567 return RESIZING_BUFFER_STREAM_DATA (stream)->buf;
|
|
|
1568 }
|
|
|
1569
|
|
788
|
1570 Lisp_Object
|
|
|
1571 resizing_buffer_to_lisp_string (Lstream *stream)
|
|
|
1572 {
|
|
|
1573 return make_string (resizing_buffer_stream_ptr (stream),
|
|
|
1574 Lstream_byte_count (stream));
|
|
|
1575 }
|
|
|
1576
|
|
428
|
1577 /*********** write to an unsigned-char dynarr ***********/
|
|
|
1578
|
|
|
1579 /* Note: If you have a dynarr whose type is not unsigned_char_dynarr
|
|
|
1580 but which is really just an unsigned_char_dynarr (e.g. its type
|
|
867
|
1581 is Ibyte or Extbyte), just cast to unsigned_char_dynarr. */
|
|
428
|
1582
|
|
|
1583 #define DYNARR_STREAM_DATA(stream) \
|
|
|
1584 LSTREAM_TYPE_DATA (stream, dynarr)
|
|
|
1585
|
|
|
1586 struct dynarr_stream
|
|
|
1587 {
|
|
|
1588 unsigned_char_dynarr *dyn;
|
|
|
1589 };
|
|
|
1590
|
|
771
|
1591 DEFINE_LSTREAM_IMPLEMENTATION ("dynarr", dynarr);
|
|
428
|
1592
|
|
|
1593 Lisp_Object
|
|
|
1594 make_dynarr_output_stream (unsigned_char_dynarr *dyn)
|
|
|
1595 {
|
|
793
|
1596 Lisp_Object obj = wrap_lstream (Lstream_new (lstream_dynarr, "w"));
|
|
|
1597
|
|
428
|
1598 DYNARR_STREAM_DATA (XLSTREAM (obj))->dyn = dyn;
|
|
|
1599 return obj;
|
|
|
1600 }
|
|
|
1601
|
|
665
|
1602 static Bytecount
|
|
462
|
1603 dynarr_writer (Lstream *stream, const unsigned char *data,
|
|
665
|
1604 Bytecount size)
|
|
428
|
1605 {
|
|
|
1606 struct dynarr_stream *str = DYNARR_STREAM_DATA (stream);
|
|
|
1607 Dynarr_add_many (str->dyn, data, size);
|
|
|
1608 return size;
|
|
|
1609 }
|
|
|
1610
|
|
|
1611 static int
|
|
|
1612 dynarr_rewinder (Lstream *stream)
|
|
|
1613 {
|
|
|
1614 Dynarr_reset (DYNARR_STREAM_DATA (stream)->dyn);
|
|
|
1615 return 0;
|
|
|
1616 }
|
|
|
1617
|
|
|
1618 static int
|
|
2286
|
1619 dynarr_closer (Lstream *UNUSED (stream))
|
|
428
|
1620 {
|
|
|
1621 return 0;
|
|
|
1622 }
|
|
|
1623
|
|
|
1624 /************ read from or write to a Lisp buffer ************/
|
|
|
1625
|
|
|
1626 /* Note: Lisp-buffer read streams never return partial characters,
|
|
|
1627 and Lisp-buffer write streams expect to never get partial
|
|
|
1628 characters. */
|
|
|
1629
|
|
|
1630 #define LISP_BUFFER_STREAM_DATA(stream) \
|
|
|
1631 LSTREAM_TYPE_DATA (stream, lisp_buffer)
|
|
|
1632
|
|
|
1633 struct lisp_buffer_stream
|
|
|
1634 {
|
|
|
1635 Lisp_Object buffer;
|
|
|
1636 Lisp_Object orig_start;
|
|
|
1637 /* we use markers to properly deal with insertion/deletion */
|
|
|
1638 Lisp_Object start, end;
|
|
|
1639 int flags;
|
|
|
1640 };
|
|
|
1641
|
|
1204
|
1642 static const struct memory_description lisp_buffer_lstream_description[] = {
|
|
|
1643 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, buffer) },
|
|
|
1644 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, orig_start) },
|
|
|
1645 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, start) },
|
|
|
1646 { XD_LISP_OBJECT, offsetof (struct lisp_buffer_stream, end) },
|
|
|
1647 { XD_END }
|
|
|
1648 };
|
|
|
1649
|
|
|
1650 DEFINE_LSTREAM_IMPLEMENTATION_WITH_DATA ("lisp-buffer", lisp_buffer);
|
|
428
|
1651
|
|
|
1652 static Lisp_Object
|
|
665
|
1653 make_lisp_buffer_stream_1 (struct buffer *buf, Charbpos start, Charbpos end,
|
|
2367
|
1654 int flags, const Ascbyte *mode)
|
|
428
|
1655 {
|
|
|
1656 Lstream *lstr;
|
|
|
1657 struct lisp_buffer_stream *str;
|
|
665
|
1658 Charbpos bmin, bmax;
|
|
428
|
1659 int reading = !strcmp (mode, "r");
|
|
|
1660
|
|
|
1661 /* Make sure the luser didn't pass "w" in. */
|
|
|
1662 if (!strcmp (mode, "w"))
|
|
2500
|
1663 ABORT ();
|
|
428
|
1664
|
|
|
1665 if (flags & LSTR_IGNORE_ACCESSIBLE)
|
|
|
1666 {
|
|
|
1667 bmin = BUF_BEG (buf);
|
|
|
1668 bmax = BUF_Z (buf);
|
|
|
1669 }
|
|
|
1670 else
|
|
|
1671 {
|
|
|
1672 bmin = BUF_BEGV (buf);
|
|
|
1673 bmax = BUF_ZV (buf);
|
|
|
1674 }
|
|
|
1675
|
|
|
1676 if (start == -1)
|
|
|
1677 start = bmin;
|
|
|
1678 if (end == -1)
|
|
|
1679 end = bmax;
|
|
|
1680 assert (bmin <= start);
|
|
|
1681 assert (start <= bmax);
|
|
|
1682 if (reading)
|
|
|
1683 {
|
|
|
1684 assert (bmin <= end);
|
|
|
1685 assert (end <= bmax);
|
|
|
1686 assert (start <= end);
|
|
|
1687 }
|
|
|
1688
|
|
|
1689 lstr = Lstream_new (lstream_lisp_buffer, mode);
|
|
|
1690 str = LISP_BUFFER_STREAM_DATA (lstr);
|
|
|
1691 {
|
|
|
1692 Lisp_Object marker;
|
|
793
|
1693 Lisp_Object buffer = wrap_buffer (buf);
|
|
428
|
1694
|
|
|
1695 marker = Fmake_marker ();
|
|
|
1696 Fset_marker (marker, make_int (start), buffer);
|
|
|
1697 str->start = marker;
|
|
|
1698 marker = Fmake_marker ();
|
|
|
1699 Fset_marker (marker, make_int (start), buffer);
|
|
|
1700 str->orig_start = marker;
|
|
|
1701 if (reading)
|
|
|
1702 {
|
|
|
1703 marker = Fmake_marker ();
|
|
|
1704 Fset_marker (marker, make_int (end), buffer);
|
|
|
1705 str->end = marker;
|
|
|
1706 }
|
|
|
1707 else
|
|
|
1708 str->end = Qnil;
|
|
|
1709 str->buffer = buffer;
|
|
|
1710 }
|
|
|
1711 str->flags = flags;
|
|
793
|
1712 return wrap_lstream (lstr);
|
|
428
|
1713 }
|
|
|
1714
|
|
|
1715 Lisp_Object
|
|
826
|
1716 make_lisp_buffer_input_stream (struct buffer *buf, Charbpos start,
|
|
|
1717 Charbpos end, int flags)
|
|
428
|
1718 {
|
|
|
1719 return make_lisp_buffer_stream_1 (buf, start, end, flags, "r");
|
|
|
1720 }
|
|
|
1721
|
|
|
1722 Lisp_Object
|
|
665
|
1723 make_lisp_buffer_output_stream (struct buffer *buf, Charbpos pos, int flags)
|
|
428
|
1724 {
|
|
|
1725 Lisp_Object lstr = make_lisp_buffer_stream_1 (buf, pos, 0, flags, "wc");
|
|
|
1726
|
|
|
1727 Lstream_set_character_mode (XLSTREAM (lstr));
|
|
|
1728 return lstr;
|
|
|
1729 }
|
|
|
1730
|
|
665
|
1731 static Bytecount
|
|
867
|
1732 lisp_buffer_reader (Lstream *stream, Ibyte *data, Bytecount size)
|
|
428
|
1733 {
|
|
|
1734 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream);
|
|
665
|
1735 Bytebpos start;
|
|
|
1736 Bytebpos end;
|
|
428
|
1737 struct buffer *buf = XBUFFER (str->buffer);
|
|
826
|
1738 Bytecount src_used;
|
|
428
|
1739
|
|
|
1740 if (!BUFFER_LIVE_P (buf))
|
|
|
1741 return 0; /* Fut. */
|
|
|
1742
|
|
826
|
1743 start = byte_marker_position (str->start);
|
|
|
1744 end = byte_marker_position (str->end);
|
|
428
|
1745 if (!(str->flags & LSTR_IGNORE_ACCESSIBLE))
|
|
|
1746 {
|
|
826
|
1747 start = bytebpos_clip_to_bounds (BYTE_BUF_BEGV (buf), start,
|
|
|
1748 BYTE_BUF_ZV (buf));
|
|
|
1749 end = bytebpos_clip_to_bounds (BYTE_BUF_BEGV (buf), end,
|
|
|
1750 BYTE_BUF_ZV (buf));
|
|
428
|
1751 }
|
|
|
1752
|
|
826
|
1753 size = copy_buffer_text_out (buf, start, end - start, data, size,
|
|
|
1754 FORMAT_DEFAULT, Qnil, &src_used);
|
|
|
1755 end = start + src_used;
|
|
428
|
1756
|
|
|
1757 if (EQ (buf->selective_display, Qt) && str->flags & LSTR_SELECTIVE)
|
|
|
1758 {
|
|
|
1759 /* What a kludge. What a kludge. What a kludge. */
|
|
867
|
1760 Ibyte *p;
|
|
840
|
1761 for (p = data; p < data + src_used; p++)
|
|
428
|
1762 if (*p == '\r')
|
|
|
1763 *p = '\n';
|
|
|
1764 }
|
|
|
1765
|
|
826
|
1766 set_byte_marker_position (str->start, end);
|
|
|
1767 return size;
|
|
428
|
1768 }
|
|
|
1769
|
|
665
|
1770 static Bytecount
|
|
867
|
1771 lisp_buffer_writer (Lstream *stream, const Ibyte *data,
|
|
665
|
1772 Bytecount size)
|
|
428
|
1773 {
|
|
|
1774 struct lisp_buffer_stream *str = LISP_BUFFER_STREAM_DATA (stream);
|
|
665
|
1775 Charbpos pos;
|
|
428
|
1776 struct buffer *buf = XBUFFER (str->buffer);
|
|
|
1777
|
|
|
1778 if (!BUFFER_LIVE_P (buf))
|
|
|
1779 return 0; /* Fut. */
|
|
|
1780
|
|
|
1781 pos = marker_position (str->start);
|
|
|
1782 pos += buffer_insert_raw_string_1 (buf, pos, data, size, 0);
|
|
|
1783 set_marker_position (str->start, pos);
|
|
|
1784 return size;
|
|
|
1785 }
|
|
|
1786
|
|
|
1787 static int
|
|
|
1788 lisp_buffer_rewinder (Lstream *stream)
|
|
|
1789 {
|
|
|
1790 struct lisp_buffer_stream *str =
|
|
|
1791 LISP_BUFFER_STREAM_DATA (stream);
|
|
|
1792 struct buffer *buf = XBUFFER (str->buffer);
|
|
|
1793 long pos = marker_position (str->orig_start);
|
|
|
1794 if (!BUFFER_LIVE_P (buf))
|
|
|
1795 return -1; /* Fut. */
|
|
|
1796 if (pos > BUF_ZV (buf))
|
|
|
1797 pos = BUF_ZV (buf);
|
|
|
1798 if (pos < marker_position (str->orig_start))
|
|
|
1799 pos = marker_position (str->orig_start);
|
|
|
1800 if (MARKERP (str->end) && pos > marker_position (str->end))
|
|
|
1801 pos = marker_position (str->end);
|
|
|
1802 set_marker_position (str->start, pos);
|
|
|
1803 return 0;
|
|
|
1804 }
|
|
|
1805
|
|
|
1806 static Lisp_Object
|
|
|
1807 lisp_buffer_marker (Lisp_Object stream)
|
|
|
1808 {
|
|
|
1809 struct lisp_buffer_stream *str =
|
|
|
1810 LISP_BUFFER_STREAM_DATA (XLSTREAM (stream));
|
|
|
1811
|
|
1204
|
1812 mark_object (str->orig_start);
|
|
428
|
1813 mark_object (str->start);
|
|
|
1814 mark_object (str->end);
|
|
|
1815 return str->buffer;
|
|
|
1816 }
|
|
|
1817
|
|
665
|
1818 Charbpos
|
|
428
|
1819 lisp_buffer_stream_startpos (Lstream *stream)
|
|
|
1820 {
|
|
|
1821 return marker_position (LISP_BUFFER_STREAM_DATA (stream)->start);
|
|
|
1822 }
|
|
|
1823
|
|
|
1824
|
|
|
1825 /************************************************************************/
|
|
|
1826 /* initialization */
|
|
|
1827 /************************************************************************/
|
|
|
1828
|
|
|
1829 void
|
|
|
1830 lstream_type_create (void)
|
|
|
1831 {
|
|
|
1832 LSTREAM_HAS_METHOD (stdio, reader);
|
|
|
1833 LSTREAM_HAS_METHOD (stdio, writer);
|
|
|
1834 LSTREAM_HAS_METHOD (stdio, rewinder);
|
|
|
1835 LSTREAM_HAS_METHOD (stdio, seekable_p);
|
|
|
1836 LSTREAM_HAS_METHOD (stdio, flusher);
|
|
|
1837 LSTREAM_HAS_METHOD (stdio, closer);
|
|
|
1838
|
|
|
1839 LSTREAM_HAS_METHOD (filedesc, reader);
|
|
|
1840 LSTREAM_HAS_METHOD (filedesc, writer);
|
|
|
1841 LSTREAM_HAS_METHOD (filedesc, was_blocked_p);
|
|
|
1842 LSTREAM_HAS_METHOD (filedesc, rewinder);
|
|
|
1843 LSTREAM_HAS_METHOD (filedesc, seekable_p);
|
|
|
1844 LSTREAM_HAS_METHOD (filedesc, closer);
|
|
|
1845
|
|
|
1846 LSTREAM_HAS_METHOD (lisp_string, reader);
|
|
|
1847 LSTREAM_HAS_METHOD (lisp_string, rewinder);
|
|
|
1848 LSTREAM_HAS_METHOD (lisp_string, marker);
|
|
|
1849
|
|
|
1850 LSTREAM_HAS_METHOD (fixed_buffer, reader);
|
|
|
1851 LSTREAM_HAS_METHOD (fixed_buffer, writer);
|
|
|
1852 LSTREAM_HAS_METHOD (fixed_buffer, rewinder);
|
|
|
1853
|
|
|
1854 LSTREAM_HAS_METHOD (resizing_buffer, writer);
|
|
|
1855 LSTREAM_HAS_METHOD (resizing_buffer, rewinder);
|
|
|
1856 LSTREAM_HAS_METHOD (resizing_buffer, closer);
|
|
|
1857
|
|
|
1858 LSTREAM_HAS_METHOD (dynarr, writer);
|
|
|
1859 LSTREAM_HAS_METHOD (dynarr, rewinder);
|
|
|
1860 LSTREAM_HAS_METHOD (dynarr, closer);
|
|
|
1861
|
|
|
1862 LSTREAM_HAS_METHOD (lisp_buffer, reader);
|
|
|
1863 LSTREAM_HAS_METHOD (lisp_buffer, writer);
|
|
|
1864 LSTREAM_HAS_METHOD (lisp_buffer, rewinder);
|
|
|
1865 LSTREAM_HAS_METHOD (lisp_buffer, marker);
|
|
|
1866 }
|
|
|
1867
|
|
2720
|
1868 #ifndef MC_ALLOC
|
|
428
|
1869 void
|
|
|
1870 reinit_vars_of_lstream (void)
|
|
|
1871 {
|
|
|
1872 int i;
|
|
|
1873
|
|
|
1874 for (i = 0; i < countof (Vlstream_free_list); i++)
|
|
|
1875 {
|
|
|
1876 Vlstream_free_list[i] = Qnil;
|
|
|
1877 staticpro_nodump (&Vlstream_free_list[i]);
|
|
|
1878 }
|
|
|
1879 }
|
|
2720
|
1880 #endif /* not MC_ALLOC */
|
|
428
|
1881
|
|
|
1882 void
|
|
|
1883 vars_of_lstream (void)
|
|
|
1884 {
|
|
442
|
1885 INIT_LRECORD_IMPLEMENTATION (lstream);
|
|
428
|
1886 }
|
