85 lines
1.8 KiB
C++
85 lines
1.8 KiB
C++
/************************************************************
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yycstsiz.cpp
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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 "clex.h"
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#ifndef min
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#define min(x, y) ((x) <= (y) ? (x) : (y))
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#endif
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// the Visual C++ v1.52 compiler generates an error in NT if this isn't present!
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#ifdef _MSC_VER
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#if defined(M_I86HM) && defined(NDEBUG)
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#pragma function(memcpy)
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#endif
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#endif
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int yylexer::yysettextsize(int size)
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{
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yyassert(size >= 0);
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if (yytext_size != size) {
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if (size < yyleng) {
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return 0;
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}
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size_t 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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size_t 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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char YYFAR* text;
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int YYFAR* statebuf;
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if (size <= yystext_size) {
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text = yystext;
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statebuf = yysstatebuf;
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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 != yytext) {
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size_t charsize = yytext_size + 1;
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memcpy(text, yytext, min(textcharsize, charsize));
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}
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if (statebuf != yystatebuf) {
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size_t charsize = yytext_size * sizeof(int);
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memcpy(statebuf, yystatebuf, min(statebufcharsize, charsize));
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}
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// free
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if (yytext != yystext) {
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free(yytext);
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}
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if (yystatebuf != yysstatebuf) {
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free(yystatebuf);
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}
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// assign
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yytext = text;
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yystatebuf = statebuf;
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yytext_size = size;
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}
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return 1;
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}
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