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/* $OpenBSD: getopt.c,v 1.1 1999/10/01 01:08:29 angelos Exp $ */
#if HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdio.h>
#include <ctype.h>
#if STDC_HEADERS
#include <string.h>
#if !defined(HAVE_STRCHR)
#define strchr index
#endif /* !HAVE_STRCHR */
#endif /* STDC_HEADERS */
/*** getopt
*
* This function is the public domain version of getopt, the command
* line argument processor, and hence is NOT copyrighted by Microsoft,
* IBM, or AT&T.
*/
#define ERR(s, c) if(opterr){\
(void) fputs(argv[0], stderr);\
(void) fputs(s, stderr);\
(void) fputc(c, stderr);\
(void) fputc('\n', stderr);}
int opterr = 1; /* flag:error message on unrecognzed options */
int optind = 1; /* last touched cmdline argument */
int optopt; /* last returned option */
char *optarg; /* argument to optopt */
int getopt(int argc, char **argv, char *opts);
/* int argc is the number of arguments on cmdline */
/* char **argv is the pointer to array of cmdline arguments */
/* char *opts is the string of all valid options */
/* each char case must be given; options taking an arg are followed by =
':' */
int getopt(int argc, char **argv, char *opts)
{
static int sp = 1;
register int c;
register char *cp;
if(sp == 1)
/* check for end of options */
if(optind >= argc ||
(argv[optind][0] != '/' &&
argv[optind][0] != '-') ||
argv[optind][1] == '\0')
return(EOF);
else if(!strcmp(argv[optind], "--")) {
optind++;
return(EOF);
}
optopt = c = argv[optind][sp];
if(c == ':' || (cp=strchr(opts, c)) == NULL) {
/* if arg sentinel as option or other invalid option,
handle the error and return '?' */
ERR(": illegal option -- ", (char)c);
if(argv[optind][++sp] == '\0') {
optind++;
sp = 1;
}
return('?');
}
if(*++cp == ':') {
/* if option is given an argument... */
if(argv[optind][sp+1] != '\0')
/* and the OptArg is in that CmdLineArg, return it... */
optarg = &argv[optind++][sp+1];
else if(++optind >= argc) {
/* but if the OptArg isn't there and the next CmdLineArg
isn't either, handle the error... */
ERR(": option requires an argument -- ", (char)c);
sp = 1;
return('?');
} else
/* but if there is another CmdLineArg there, return that */
optarg = argv[optind++];
/* and set up for the next CmdLineArg */
sp = 1;
} else {
/* no arg for this opt, so null arg and set up for next option */
if(argv[optind][++sp] == '\0') {
sp = 1;
optind++;
}
optarg = NULL;
}
return(c);
}
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