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annotate lwlib/lw_strpool.c @ 502:14a40f8bb4eb

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Add various operators to lwcc Add various binary and ternary operators to lwcc, but only those which can work with constant operands. Seems like variables are probably required next.
author William Astle <lost@l-w.ca>
date Wed, 25 Sep 2019 20:23:49 -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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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 }