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OPTION.C
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C/C++ Source or Header
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1991-10-16
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1KB
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40 lines
/*
** Return options set by string as value (type OPTION);
** mask defines which bits can be set, number returns possible numeric
** parameter value. Examples of masks, option strings and returned
** option bits:
** OPTIONA|OPTIONB a OPTIONA
** OPTIONA|OPTIONB B OPTIONB
** OPTIONA|OPTIONB x OPTERR
** OPTIONA|OPTIONB ax OPTIONA|OPTERR
** OPTIONA|OPTNUM a OPTIONA
** OPTIONA|OPTNUM a31 OPTIONA|OPTNUM (and *number set to 31)
** OPTIONA|OPTNUM 14a OPTNUM|OPTERR (and *number set to 14)
*/
#include <ctype.h>
#include "option.h"
#include "formatch.h"
OPTION option(string,mask,number)
char string[];
OPTION mask;
unsigned int *number; {
unsigned register char c;
int nonum=1;
OPTION l;
for(l=0L; c=tolower(*string); string++)
if(islower(c) && ((mask>>(c-'a'))&1) && !(l&OPTNUM))
l |= 1L<<(c-'a');
else if(isdigit(c) && mask&OPTNUM) {
if(nonum) *number=nonum=0;
*number = *number*10+c-'0';
l |= OPTNUM;
} else if(c==*optsepar)
*optsepar='\0';
else if(!isspace(c))
l |= OPTERR;
return l;
}