85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
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/************************************************************
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yymstsiz.c
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This file can be freely modified for the generation of
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custom code.
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Copyright (c) 1999 Bumble-Bee Software Ltd.
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************************************************************/
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#include <stdlib.h>
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#include <string.h>
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#include "mlex.h"
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#ifdef YYPROTOTYPE
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int YYCDECL yymsettextsize(yymlex_t YYFAR *yy, int size)
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#else
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int YYCDECL yymsettextsize(yy, size)
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yymlex_t YYFAR *yy;
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int size;
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#endif
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{
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yyassert(yy != NULL);
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yyassert(size >= 0);
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if (yy->yymtext_size != size) {
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char YYFAR *text;
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int YYFAR *statebuf;
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size_t textcharsize;
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size_t statebufcharsize;
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if (size < yy->yymleng) {
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return 0;
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}
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textcharsize = size + 1; /* include the '\0' */
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if (textcharsize <= (size_t) size) {
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return 0; /* integer overflow */
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}
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statebufcharsize = size * sizeof(int);
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if ((int) (statebufcharsize / sizeof(int)) != size) {
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return 0; /* integer overflow */
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}
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/* allocate */
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if (size <= yy->yymstext_size) {
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text = yy->yymstext;
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statebuf = yy->yymsstatebuf;
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}
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else {
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text = (char YYFAR *) malloc(textcharsize);
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if (text == NULL) {
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return 0;
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}
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statebuf = (int YYFAR *) malloc(statebufcharsize);
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if (statebuf == NULL) {
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free(text); /* clean up */
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return 0;
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}
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}
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/* copy */
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if (text != yy->yymtext) {
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size_t charsize = yy->yymtext_size + 1;
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memcpy(text, yy->yymtext, min(textcharsize, charsize));
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}
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if (statebuf != yy->yymstatebuf) {
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size_t charsize = yy->yymtext_size * sizeof(int);
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memcpy(statebuf, yy->yymstatebuf, min(statebufcharsize, charsize));
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}
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/* free */
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if (yy->yymtext != yy->yymstext) {
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free(yy->yymtext);
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}
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if (yy->yymstatebuf != yy->yymsstatebuf) {
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free(yy->yymstatebuf);
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}
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/* assign */
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yy->yymtext = text;
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yy->yymstatebuf = statebuf;
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yy->yymtext_size = size;
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}
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return 1;
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}
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