ReactOS 0.4.15-dev-5666-gc548b97
getopt.c
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1
2/* jgaa oct 9th 2000: Found this on www.
3 * No copyright information given.
4 * Slightly modidied.
5 *
6 * Origin: http://www.winsite.com/info/pc/win3/winsock/sossntr4.zip/SOSSNT/SRC/GETOPT.C.html
7 */
8
9 /* got this off net.sources */
10
11#include <stdio.h>
12#include <stdlib.h>
13#include <string.h>
14
15#include "getopt.h"
16
17
18/*
19* get option letter from argument vector
20*/
21int opterr = 1, /* useless, never set or used */
22optind = 1, /* index into parent argv vector */
23optopt; /* character checked for validity */
24char* optarg; /* argument associated with option */
25
26#define BADCH (int)'?'
27#define EMSG ""
28#define tell(s) fputs(*argv,stderr);fputs(s,stderr); \
29 fputc(optopt,stderr);fputc('\n',stderr);return(BADCH);
30
31int getopt(int argc, char * const *argv, const char *optstring)
32{
33 static char *place = EMSG; /* option letter processing */
34 register char *oli; /* option letter list index */
35
36 if(!*place) { /* update scanning pointer */
37 if(optind >= argc || *(place = argv[optind]) != '-' || !*++place)
38 return(EOF);
39 if (*place == '-') { /* found "--" */
40 ++optind;
41 return(EOF);
42 }
43 } /* option letter okay? */
44 if ((optopt = (int)*place++) == (int)':' || !(oli = strchr(optstring,optopt)))
45 {
46 if(!*place) ++optind;
47 tell(": illegal option -- ");
48 }
49 if (*++oli != ':') { /* don't need argument */
50 optarg = NULL;
51 if (!*place) ++optind;
52 }
53 else { /* need an argument */
54 if (*place) optarg = place; /* no white space */
55 else if (argc <= ++optind) { /* no arg */
56 place = EMSG;
57 tell(": option requires an argument -- ");
58 }
59 else optarg = argv[optind]; /* white space */
60 place = EMSG;
61 ++optind;
62 }
63 return(optopt); /* dump back option letter */
64}
static int argc
Definition: ServiceArgs.c:12
char * strchr(const char *String, int ch)
Definition: utclib.c:501
int optopt
Definition: getopt.c:48
#define EMSG
Definition: getopt.c:52
int getopt(int nargc, char *const *nargv, const char *ostr)
Definition: getopt.c:55
const char * optarg
Definition: getopt.c:49
int optind
Definition: getopt.c:47
int opterr
Definition: getopt.c:46
#define NULL
Definition: types.h:112
#define EOF
Definition: stdio.h:24
#define argv
Definition: mplay32.c:18
#define tell(s)
Definition: getopt.c:28
static char * place
Definition: getopt.c:55