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/* @(#)getopt.c */
#define _POSIX_SOURCE
#include <stdio.h>
#include <string.h>
#include "trueprint.h"
#include "main.h"
/*
* get option letter from argument vector
*/
int optind = 1; /* index into parent argv vector */
char *optarg; /* argument associated with option */
static int optopt; /* character checked for validity */
int
getopt(int nargc, char **nargv, char *ostr)
{
register char *oli; /* option letter list index */
static char *place = ""; /* option letter processing */
if(!*place) { /* update scanning pointer */
if(optind >= nargc || *(place = nargv[optind]) != '-' || !*++place) {
place = "";
return(EOF);
}
if (*place == '-') { /* found "--" */
++optind;
place = "";
return EOF;
}
} /* option letter okay? */
if ((optopt = (int)*place++) == (int)':' || !(oli = strchr(ostr,optopt))) {
if(!*place) ++optind;
(void)fprintf(stderr, "%s: illegal option -- %c\n", cmd_name, optopt);
return '?';
}
if (*++oli != ':') { /* don't need argument */
optarg = NULL;
if (!*place) ++optind;
} else { /* need an argument */
if (*place) { /* no white space */
optarg = place;
} else if (nargc <= ++optind) { /* no arg */
place = "";
(void)fprintf(stderr, "%s: option requires an argument -- %c\n", cmd_name, optopt);
optopt = '?';
} else {
optarg = nargv[optind]; /* white space */
}
place = "";
++optind;
}
return optopt; /* dump back option letter */
}
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