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Converted preproc logic to library and moved some utility stuff to lwlib The strbuf and strpool stuff is generally useful so move it to lwlib where other such things live. Also, package the preprocessor logic into a library for easy use in multiple places.
author William Astle <lost@l-w.ca>
date Sat, 21 Sep 2013 13:33:54 -0600
parents lwcc/strpool.c@d85d173ba120
children
comparison
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307:9e342c4e4b66 308:670ea8f90212
1 /*
2 lwlib/lw_strpool.c
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 #include <string.h>
24
25 #include "lw_alloc.h"
26 #include "lw_string.h"
27 #include "lw_strpool.h"
28
29 struct lw_strpool *lw_strpool_create(void)
30 {
31 struct lw_strpool *sp;
32
33 sp = lw_alloc(sizeof(struct lw_strpool));
34 sp -> nstrs = 0;
35 sp -> strs = NULL;
36 return sp;
37 }
38
39 extern void lw_strpool_free(struct lw_strpool *sp)
40 {
41 int i;
42
43 for (i = 0; i < sp -> nstrs; i++)
44 lw_free(sp -> strs[i]);
45 lw_free(sp -> strs);
46 lw_free(sp);
47 }
48
49 char *lw_strpool_strdup(struct lw_strpool *sp, const char *s)
50 {
51 int i;
52
53 if (!s)
54 return NULL;
55
56 /* first do a fast scan for a pointer match */
57 for (i = 0; i < sp -> nstrs; i++)
58 if (sp -> strs[i] == s)
59 return sp -> strs[i];
60
61 /* no match - do a slow scan for a string match */
62 for (i = 0; i < sp -> nstrs; i++)
63 if (strcmp(sp -> strs[i], s) == 0)
64 return sp -> strs[i];
65
66 /* no match - create a new string entry */
67 sp -> strs = lw_realloc(sp -> strs, sizeof(char *) * (sp -> nstrs + 1));
68 sp -> strs[sp -> nstrs] = lw_strdup(s);
69 sp -> nstrs++;
70 return sp -> strs[sp -> nstrs - 1];
71 }