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view lwlib/lw_strpool.c @ 502:14a40f8bb4eb
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> |
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date | Wed, 25 Sep 2019 20:23:49 -0600 |
parents | 670ea8f90212 |
children |
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/* lwlib/lw_strpool.c Copyright © 2013 William Astle This file is part of LWTOOLS. LWTOOLS 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 3 of the License, or (at your option) any later version. This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ #include <stdlib.h> #include <string.h> #include "lw_alloc.h" #include "lw_string.h" #include "lw_strpool.h" struct lw_strpool *lw_strpool_create(void) { struct lw_strpool *sp; sp = lw_alloc(sizeof(struct lw_strpool)); sp -> nstrs = 0; sp -> strs = NULL; return sp; } extern void lw_strpool_free(struct lw_strpool *sp) { int i; for (i = 0; i < sp -> nstrs; i++) lw_free(sp -> strs[i]); lw_free(sp -> strs); lw_free(sp); } char *lw_strpool_strdup(struct lw_strpool *sp, const char *s) { int i; if (!s) return NULL; /* first do a fast scan for a pointer match */ for (i = 0; i < sp -> nstrs; i++) if (sp -> strs[i] == s) return sp -> strs[i]; /* no match - do a slow scan for a string match */ for (i = 0; i < sp -> nstrs; i++) if (strcmp(sp -> strs[i], s) == 0) return sp -> strs[i]; /* no match - create a new string entry */ sp -> strs = lw_realloc(sp -> strs, sizeof(char *) * (sp -> nstrs + 1)); sp -> strs[sp -> nstrs] = lw_strdup(s); sp -> nstrs++; return sp -> strs[sp -> nstrs - 1]; }