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annotate lwlib/lw_strbuf.c @ 583:000381ee2d5c default tip
Guard against single operand multiplication when detecting like terms
This *shouldn't* happen, but it apparently does in some pathological cases
so guard against a single operand multiplication to prevent a crash.
| author | William Astle <lost@l-w.ca> |
|---|---|
| date | Mon, 04 Nov 2024 23:48:23 -0700 |
| parents | 670ea8f90212 |
| children |
| rev | line source |
|---|---|
| 295 | 1 /* |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
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2 lwlib/lw_strbuf.c |
| 295 | 3 |
| 4 Copyright © 2013 William Astle | |
| 5 | |
| 6 This file is part of LWTOOLS. | |
| 7 | |
| 8 LWTOOLS is free software: you can redistribute it and/or modify it under the | |
| 9 terms of the GNU General Public License as published by the Free Software | |
| 10 Foundation, either version 3 of the License, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 16 more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License along with | |
| 19 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 20 */ | |
| 21 | |
| 22 #include <stdlib.h> | |
| 23 | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
|
24 #include "lw_alloc.h" |
|
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
|
25 #include "lw_strbuf.h" |
| 295 | 26 |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
|
27 struct lw_strbuf *lw_strbuf_new(void) |
| 295 | 28 { |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
|
29 struct lw_strbuf *lw_strbuf; |
| 295 | 30 |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
|
31 lw_strbuf = lw_alloc(sizeof(struct lw_strbuf)); |
|
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
|
32 lw_strbuf -> str = NULL; |
|
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
|
33 lw_strbuf -> bo = 0; |
|
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
|
34 lw_strbuf -> bl = 0; |
|
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
|
35 return lw_strbuf; |
| 295 | 36 } |
| 37 | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
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38 void lw_strbuf_add(struct lw_strbuf *lw_strbuf, int c) |
| 295 | 39 { |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
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40 if (lw_strbuf -> bo >= lw_strbuf -> bl) |
| 295 | 41 { |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
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42 lw_strbuf -> bl += 100; |
|
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
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43 lw_strbuf -> str = lw_realloc(lw_strbuf -> str, lw_strbuf -> bl); |
| 295 | 44 } |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
|
45 lw_strbuf -> str[lw_strbuf -> bo++] = c; |
| 295 | 46 } |
| 47 | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
|
48 char *lw_strbuf_end(struct lw_strbuf *lw_strbuf) |
| 295 | 49 { |
| 50 char *rv; | |
| 51 | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
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52 lw_strbuf_add(lw_strbuf, 0); |
|
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
|
53 rv = lw_strbuf -> str; |
|
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
295
diff
changeset
|
54 lw_free(lw_strbuf); |
| 295 | 55 return rv; |
| 56 } |