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annotate lwlib/lw_strpool.c @ 547:33e37b3d98cf

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Don't build snprintf() emulation on modern enough MSVC MSVC 2015 and later have a C99 compliant snprintf() so don't build the emulation function for it if building on a modern enough version.
author William Astle <lost@l-w.ca>
date Thu, 16 Mar 2023 16:18:13 -0600
parents 670ea8f90212
children
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1 /*
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2 lwlib/lw_strpool.c
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3
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4 Copyright © 2013 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program 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 for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include <stdlib.h>
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23 #include <string.h>
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24
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25 #include "lw_alloc.h"
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26 #include "lw_string.h"
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27 #include "lw_strpool.h"
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28
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29 struct lw_strpool *lw_strpool_create(void)
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30 {
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31 struct lw_strpool *sp;
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32
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33 sp = lw_alloc(sizeof(struct lw_strpool));
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34 sp -> nstrs = 0;
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35 sp -> strs = NULL;
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36 return sp;
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37 }
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38
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39 extern void lw_strpool_free(struct lw_strpool *sp)
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40 {
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41 int i;
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42
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43 for (i = 0; i < sp -> nstrs; i++)
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44 lw_free(sp -> strs[i]);
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45 lw_free(sp -> strs);
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46 lw_free(sp);
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47 }
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48
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49 char *lw_strpool_strdup(struct lw_strpool *sp, const char *s)
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50 {
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51 int i;
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52
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53 if (!s)
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54 return NULL;
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55
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56 /* first do a fast scan for a pointer match */
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57 for (i = 0; i < sp -> nstrs; i++)
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58 if (sp -> strs[i] == s)
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59 return sp -> strs[i];
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60
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61 /* no match - do a slow scan for a string match */
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62 for (i = 0; i < sp -> nstrs; i++)
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63 if (strcmp(sp -> strs[i], s) == 0)
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64 return sp -> strs[i];
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65
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66 /* no match - create a new string entry */
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67 sp -> strs = lw_realloc(sp -> strs, sizeof(char *) * (sp -> nstrs + 1));
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68 sp -> strs[sp -> nstrs] = lw_strdup(s);
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69 sp -> nstrs++;
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70 return sp -> strs[sp -> nstrs - 1];
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71 }