107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
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/* getopt.c,v 3.1 1993/07/06 01:08:18 jbj Exp
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* getopt - get option letter from argv
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*
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* This is a version of the public domain getopt() implementation by
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* Henry Spencer, changed for 4.3BSD compatibility (in addition to System V).
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* It allows rescanning of an option list by setting optind to 0 before
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* calling. Thanks to Dennis Ferguson for the appropriate modifications.
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*
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* This file is in the Public Domain.
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*/
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/*LINTLIBRARY*/
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#include <stdio.h>
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#include "ntp_stdlib.h"
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#ifdef lint
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#undef putc
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#define putc fputc
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#endif /* lint */
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char *optarg; /* Global argument pointer. */
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#ifndef __convex__
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int optind = 0; /* Global argv index. */
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#else /* __convex__ */
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extern int optind; /* Global argv index. */
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#endif /* __convex__ */
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/*
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* N.B. use following at own risk
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*/
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#ifndef __convex__
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int opterr = 1; /* for compatibility, should error be printed? */
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#else /* __convex__ */
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extern int opterr; /* for compatibility, should error be printed? */
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#endif /* __convex__ */
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int optopt; /* for compatibility, option character checked */
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static char *scan = NULL; /* Private scan pointer. */
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/*
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* Print message about a bad option. Watch this definition, it's
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* not a single statement.
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*/
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#define BADOPT(mess, ch) if (opterr) { \
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fputs(argv[0], stderr); \
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fputs(mess, stderr); \
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(void) putc(ch, stderr); \
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(void) putc('\n', stderr); \
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} \
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return('?')
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int
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getopt_l(argc, argv, optstring)
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int argc;
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char *argv[];
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char *optstring;
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{
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register char c;
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register char *place;
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optarg = NULL;
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if (optind == 0) {
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scan = NULL;
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optind++;
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}
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if (scan == NULL || *scan == '\0') {
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if (optind >= argc || argv[optind][0] != '-' || argv[optind][1] == '\0')
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return EOF;
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if (argv[optind][1] == '-' && argv[optind][2] == '\0') {
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optind++;
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return EOF;
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}
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scan = argv[optind]+1;
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optind++;
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}
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c = *scan++;
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optopt = c & 0377;
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for (place = optstring; place != NULL && *place != '\0'; ++place)
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if (*place == c)
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break;
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if (place == NULL || *place == '\0' || c == ':' || c == '?') {
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BADOPT(": unknown option -", c);
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}
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place++;
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if (*place == ':') {
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if (*scan != '\0') {
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optarg = scan;
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scan = NULL;
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} else if (optind >= argc) {
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BADOPT(": option requires argument -", c);
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} else {
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optarg = argv[optind];
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optind++;
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}
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}
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return c&0377;
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}
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