86 lines
2.0 KiB
C++
86 lines
2.0 KiB
C++
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/************************************************************
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yycsssiz.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 "cyacc.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 yyparser::yysetstacksize(int size)
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{
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yyassert(size >= 0);
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if (yystack_size != size) {
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if (size <= yytop) {
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return 0;
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}
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size_t stackcharsize = size * sizeof(yystack_t);
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if ((int)(stackcharsize / sizeof(yystack_t)) != size) {
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return 0; // integer overflow
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}
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size_t attributestackcharsize = size * yyattribute_size;
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if ((int)(attributestackcharsize / yyattribute_size) != size) {
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return 0; // integer overflow
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}
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// allocate
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yystack_t YYFAR* stackptr;
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void YYFAR* attributestackptr;
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if (size <= yysstack_size) {
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stackptr = yysstackptr;
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attributestackptr = yysattributestackptr;
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}
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else {
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stackptr = (yystack_t YYFAR*)malloc(stackcharsize);
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if (stackptr == NULL) {
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return 0;
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}
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attributestackptr = malloc(attributestackcharsize);
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if (attributestackptr == NULL) {
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free(stackptr); // 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 (stackptr != yystackptr) {
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size_t charsize = yystack_size * sizeof(yystack_t);
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memcpy(stackptr, yystackptr, min(stackcharsize, charsize));
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}
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if (attributestackptr != yyattributestackptr) {
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size_t charsize = yystack_size * yyattribute_size;
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memcpy(attributestackptr, yyattributestackptr, min(attributestackcharsize,
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charsize));
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}
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// free
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if (yystackptr != yysstackptr) {
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free(yystackptr);
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}
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if (yyattributestackptr != yysattributestackptr) {
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free(yyattributestackptr);
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}
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// assign
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yystackptr = stackptr;
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yyattributestackptr = attributestackptr;
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yystack_size = size;
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}
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return 1;
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}
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