SBSPSS/Utils/Parser Generator/SOURCE/yymstsiz.c

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2000-12-08 21:40:33 +01:00
/************************************************************
yymstsiz.c
This file can be freely modified for the generation of
custom code.
Copyright (c) 1999 Bumble-Bee Software Ltd.
************************************************************/
#include <stdlib.h>
#include <string.h>
#include "mlex.h"
#ifdef YYPROTOTYPE
int YYCDECL yymsettextsize(yymlex_t YYFAR *yy, int size)
#else
int YYCDECL yymsettextsize(yy, size)
yymlex_t YYFAR *yy;
int size;
#endif
{
yyassert(yy != NULL);
yyassert(size >= 0);
if (yy->yymtext_size != size) {
char YYFAR *text;
int YYFAR *statebuf;
size_t textcharsize;
size_t statebufcharsize;
if (size < yy->yymleng) {
return 0;
}
textcharsize = size + 1; /* include the '\0' */
if (textcharsize <= (size_t) size) {
return 0; /* integer overflow */
}
statebufcharsize = size * sizeof(int);
if ((int) (statebufcharsize / sizeof(int)) != size) {
return 0; /* integer overflow */
}
/* allocate */
if (size <= yy->yymstext_size) {
text = yy->yymstext;
statebuf = yy->yymsstatebuf;
}
else {
text = (char YYFAR *) malloc(textcharsize);
if (text == NULL) {
return 0;
}
statebuf = (int YYFAR *) malloc(statebufcharsize);
if (statebuf == NULL) {
free(text); /* clean up */
return 0;
}
}
/* copy */
if (text != yy->yymtext) {
size_t charsize = yy->yymtext_size + 1;
memcpy(text, yy->yymtext, min(textcharsize, charsize));
}
if (statebuf != yy->yymstatebuf) {
size_t charsize = yy->yymtext_size * sizeof(int);
memcpy(statebuf, yy->yymstatebuf, min(statebufcharsize, charsize));
}
/* free */
if (yy->yymtext != yy->yymstext) {
free(yy->yymtext);
}
if (yy->yymstatebuf != yy->yymsstatebuf) {
free(yy->yymstatebuf);
}
/* assign */
yy->yymtext = text;
yy->yymstatebuf = statebuf;
yy->yymtext_size = size;
}
return 1;
}