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The C Users' Group Library 1994 August
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v_07_02
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v7n2031a.txt
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1988-12-04
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/*
* lexgen.c - Portable program to GENerate LEXical tables.
*/
#include <stdio.h>
#include <stdlib.h>
#if __STDC__ /* if ANSI C compiler */
#include <limits.h>
#endif
#ifndef UCHAR_MAX /* define it ourselves as last resort. */
#define UCHAR_MAX ((unsigned)255)
#endif
#include "chclass.h"
#define OUTFILE "cctable.c"
#define UALPHA "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
#define LALPHA "abcdefghijklmnopqrstuvwxyz"
#define DIGIT "0123456789"
char _cctable[1]; /* dummy to satisfy extern in chclass.h */
main(int argc, char **argv){
unsigned char *gentab = (unsigned char *)calloc(UCHAR_MAX+1, sizeof(char));
void settab(unsigned char *table, int bit, char *chars);
void prntab(unsigned char *table, FILE *fout);
FILE *fout;
if( (fout = fopen(OUTFILE, "w")) == NULL){
fprintf(stderr, "%s: Can't open '%s' for output\n", argv[0], OUTFILE);
exit(EXIT_FAILURE);
}
settab(gentab, _CCID1_, UALPHA LALPHA "_");
settab(gentab, _CCID_, UALPHA LALPHA "_" DIGIT);
settab(gentab, _CCEXP_, "eE");
settab(gentab, _CCSIGN_, "-+");
prntab(gentab, fout);
fclose(fout);
}
void settab(unsigned char *table, int bit, char *chars) {
while(*chars)
table[*chars++] |= bit; /* turn on correct bit */
}
void prntab(unsigned char *table, FILE *fout) {
unsigned i;
fprintf(fout, "\
/*\n\
* %s - character classification table.\n\
*/\n\
\n\
char _cctable[] = {\n\
", OUTFILE);
for(i = 0; i <= UCHAR_MAX; ++i) {
if(i)
fputs(",", fout);
fprintf(fout, (i%8) ? " " : "\n ");
fprintf(fout, "0x%0X", table[i]);
}
fprintf(fout, "\n };\n");
}