dyn-string.c
11.7 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
/* An abstract string datatype.
Copyright (C) 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
Contributed by Mark Mitchell (mark@markmitchell.com).
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
In addition to the permissions in the GNU General Public License, the
Free Software Foundation gives you unlimited permission to link the
compiled version of this file into combinations with other programs,
and to distribute those combinations without any restriction coming
from the use of this file. (The General Public License restrictions
do apply in other respects; for example, they cover modification of
the file, and distribution when not linked into a combined
executable.)
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include "libiberty.h"
#include "dyn-string.h"
/* If this file is being compiled for inclusion in the C++ runtime
library, as part of the demangler implementation, we don't want to
abort if an allocation fails. Instead, percolate an error code up
through the call chain. */
#if defined(IN_LIBGCC2) || defined(IN_GLIBCPP_V3)
#define RETURN_ON_ALLOCATION_FAILURE
#endif
/* Performs in-place initialization of a dyn_string struct. This
function can be used with a dyn_string struct on the stack or
embedded in another object. The contents of of the string itself
are still dynamically allocated. The string initially is capable
of holding at least SPACE characeters, including the terminating
NUL. If SPACE is 0, it will silently be increated to 1.
If RETURN_ON_ALLOCATION_FAILURE is defined and memory allocation
fails, returns 0. Otherwise returns 1. */
int
dyn_string_init (ds_struct_ptr, space)
struct dyn_string *ds_struct_ptr;
int space;
{
/* We need at least one byte in which to store the terminating NUL. */
if (space == 0)
space = 1;
#ifdef RETURN_ON_ALLOCATION_FAILURE
ds_struct_ptr->s = (char *) malloc (space);
if (ds_struct_ptr->s == NULL)
return 0;
#else
ds_struct_ptr->s = (char *) xmalloc (space);
#endif
ds_struct_ptr->allocated = space;
ds_struct_ptr->length = 0;
ds_struct_ptr->s[0] = '\0';
return 1;
}
/* Create a new dynamic string capable of holding at least SPACE
characters, including the terminating NUL. If SPACE is 0, it will
be silently increased to 1. If RETURN_ON_ALLOCATION_FAILURE is
defined and memory allocation fails, returns NULL. Otherwise
returns the newly allocated string. */
dyn_string_t
dyn_string_new (space)
int space;
{
dyn_string_t result;
#ifdef RETURN_ON_ALLOCATION_FAILURE
result = (dyn_string_t) malloc (sizeof (struct dyn_string));
if (result == NULL)
return NULL;
if (!dyn_string_init (result, space))
{
free (result);
return NULL;
}
#else
result = (dyn_string_t) xmalloc (sizeof (struct dyn_string));
dyn_string_init (result, space);
#endif
return result;
}
/* Free the memory used by DS. */
void
dyn_string_delete (ds)
dyn_string_t ds;
{
free (ds->s);
free (ds);
}
/* Returns the contents of DS in a buffer allocated with malloc. It
is the caller's responsibility to deallocate the buffer using free.
DS is then set to the empty string. Deletes DS itself. */
char*
dyn_string_release (ds)
dyn_string_t ds;
{
/* Store the old buffer. */
char* result = ds->s;
/* The buffer is no longer owned by DS. */
ds->s = NULL;
/* Delete DS. */
free (ds);
/* Return the old buffer. */
return result;
}
/* Increase the capacity of DS so it can hold at least SPACE
characters, plus the terminating NUL. This function will not (at
present) reduce the capacity of DS. Returns DS on success.
If RETURN_ON_ALLOCATION_FAILURE is defined and a memory allocation
operation fails, deletes DS and returns NULL. */
dyn_string_t
dyn_string_resize (ds, space)
dyn_string_t ds;
int space;
{
int new_allocated = ds->allocated;
/* Increase SPACE to hold the NUL termination. */
++space;
/* Increase allocation by factors of two. */
while (space > new_allocated)
new_allocated *= 2;
if (new_allocated != ds->allocated)
{
ds->allocated = new_allocated;
/* We actually need more space. */
#ifdef RETURN_ON_ALLOCATION_FAILURE
ds->s = (char *) realloc (ds->s, ds->allocated);
if (ds->s == NULL)
{
free (ds);
return NULL;
}
#else
ds->s = (char *) xrealloc (ds->s, ds->allocated);
#endif
}
return ds;
}
/* Sets the contents of DS to the empty string. */
void
dyn_string_clear (ds)
dyn_string_t ds;
{
/* A dyn_string always has room for at least the NUL terminator. */
ds->s[0] = '\0';
ds->length = 0;
}
/* Makes the contents of DEST the same as the contents of SRC. DEST
and SRC must be distinct. Returns 1 on success. On failure, if
RETURN_ON_ALLOCATION_FAILURE, deletes DEST and returns 0. */
int
dyn_string_copy (dest, src)
dyn_string_t dest;
dyn_string_t src;
{
if (dest == src)
abort ();
/* Make room in DEST. */
if (dyn_string_resize (dest, src->length) == NULL)
return 0;
/* Copy DEST into SRC. */
strcpy (dest->s, src->s);
/* Update the size of DEST. */
dest->length = src->length;
return 1;
}
/* Copies SRC, a NUL-terminated string, into DEST. Returns 1 on
success. On failure, if RETURN_ON_ALLOCATION_FAILURE, deletes DEST
and returns 0. */
int
dyn_string_copy_cstr (dest, src)
dyn_string_t dest;
const char *src;
{
int length = strlen (src);
/* Make room in DEST. */
if (dyn_string_resize (dest, length) == NULL)
return 0;
/* Copy DEST into SRC. */
strcpy (dest->s, src);
/* Update the size of DEST. */
dest->length = length;
return 1;
}
/* Inserts SRC at the beginning of DEST. DEST is expanded as
necessary. SRC and DEST must be distinct. Returns 1 on success.
On failure, if RETURN_ON_ALLOCATION_FAILURE, deletes DEST and
returns 0. */
int
dyn_string_prepend (dest, src)
dyn_string_t dest;
dyn_string_t src;
{
return dyn_string_insert (dest, 0, src);
}
/* Inserts SRC, a NUL-terminated string, at the beginning of DEST.
DEST is expanded as necessary. Returns 1 on success. On failure,
if RETURN_ON_ALLOCATION_FAILURE, deletes DEST and returns 0. */
int
dyn_string_prepend_cstr (dest, src)
dyn_string_t dest;
const char *src;
{
return dyn_string_insert_cstr (dest, 0, src);
}
/* Inserts SRC into DEST starting at position POS. DEST is expanded
as necessary. SRC and DEST must be distinct. Returns 1 on
success. On failure, if RETURN_ON_ALLOCATION_FAILURE, deletes DEST
and returns 0. */
int
dyn_string_insert (dest, pos, src)
dyn_string_t dest;
int pos;
dyn_string_t src;
{
int i;
if (src == dest)
abort ();
if (dyn_string_resize (dest, dest->length + src->length) == NULL)
return 0;
/* Make room for the insertion. Be sure to copy the NUL. */
for (i = dest->length; i >= pos; --i)
dest->s[i + src->length] = dest->s[i];
/* Splice in the new stuff. */
strncpy (dest->s + pos, src->s, src->length);
/* Compute the new length. */
dest->length += src->length;
return 1;
}
/* Inserts SRC, a NUL-terminated string, into DEST starting at
position POS. DEST is expanded as necessary. Returns 1 on
success. On failure, RETURN_ON_ALLOCATION_FAILURE, deletes DEST
and returns 0. */
int
dyn_string_insert_cstr (dest, pos, src)
dyn_string_t dest;
int pos;
const char *src;
{
int i;
int length = strlen (src);
if (dyn_string_resize (dest, dest->length + length) == NULL)
return 0;
/* Make room for the insertion. Be sure to copy the NUL. */
for (i = dest->length; i >= pos; --i)
dest->s[i + length] = dest->s[i];
/* Splice in the new stuff. */
strncpy (dest->s + pos, src, length);
/* Compute the new length. */
dest->length += length;
return 1;
}
/* Inserts character C into DEST starting at position POS. DEST is
expanded as necessary. Returns 1 on success. On failure,
RETURN_ON_ALLOCATION_FAILURE, deletes DEST and returns 0. */
int
dyn_string_insert_char (dest, pos, c)
dyn_string_t dest;
int pos;
int c;
{
int i;
if (dyn_string_resize (dest, dest->length + 1) == NULL)
return 0;
/* Make room for the insertion. Be sure to copy the NUL. */
for (i = dest->length; i >= pos; --i)
dest->s[i + 1] = dest->s[i];
/* Add the new character. */
dest->s[pos] = c;
/* Compute the new length. */
++dest->length;
return 1;
}
/* Append S to DS, resizing DS if necessary. Returns 1 on success.
On failure, if RETURN_ON_ALLOCATION_FAILURE, deletes DEST and
returns 0. */
int
dyn_string_append (dest, s)
dyn_string_t dest;
dyn_string_t s;
{
if (dyn_string_resize (dest, dest->length + s->length) == 0)
return 0;
strcpy (dest->s + dest->length, s->s);
dest->length += s->length;
return 1;
}
/* Append the NUL-terminated string S to DS, resizing DS if necessary.
Returns 1 on success. On failure, if RETURN_ON_ALLOCATION_FAILURE,
deletes DEST and returns 0. */
int
dyn_string_append_cstr (dest, s)
dyn_string_t dest;
const char *s;
{
int len = strlen (s);
/* The new length is the old length plus the size of our string, plus
one for the null at the end. */
if (dyn_string_resize (dest, dest->length + len) == NULL)
return 0;
strcpy (dest->s + dest->length, s);
dest->length += len;
return 1;
}
/* Appends C to the end of DEST. Returns 1 on success. On failiure,
if RETURN_ON_ALLOCATION_FAILURE, deletes DEST and returns 0. */
int
dyn_string_append_char (dest, c)
dyn_string_t dest;
int c;
{
/* Make room for the extra character. */
if (dyn_string_resize (dest, dest->length + 1) == NULL)
return 0;
/* Append the character; it will overwrite the old NUL. */
dest->s[dest->length] = c;
/* Add a new NUL at the end. */
dest->s[dest->length + 1] = '\0';
/* Update the length. */
++(dest->length);
return 1;
}
/* Sets the contents of DEST to the substring of SRC starting at START
and ending before END. START must be less than or equal to END,
and both must be between zero and the length of SRC, inclusive.
Returns 1 on success. On failure, if RETURN_ON_ALLOCATION_FAILURE,
deletes DEST and returns 0. */
int
dyn_string_substring (dest, src, start, end)
dyn_string_t dest;
dyn_string_t src;
int start;
int end;
{
int i;
int length = end - start;
if (start > end || start > src->length || end > src->length)
abort ();
/* Make room for the substring. */
if (dyn_string_resize (dest, length) == NULL)
return 0;
/* Copy the characters in the substring, */
for (i = length; --i >= 0; )
dest->s[i] = src->s[start + i];
/* NUL-terimate the result. */
dest->s[length] = '\0';
/* Record the length of the substring. */
dest->length = length;
return 1;
}
/* Returns non-zero if DS1 and DS2 have the same contents. */
int
dyn_string_eq (ds1, ds2)
dyn_string_t ds1;
dyn_string_t ds2;
{
/* If DS1 and DS2 have different lengths, they must not be the same. */
if (ds1->length != ds2->length)
return 0;
else
return !strcmp (ds1->s, ds2->s);
}