blob: 0217550ad234fc41ad890e24a082052f1dd2154b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
/* An implementation of getopt() by Amrit Prem */
#include <stdio.h>
#include <string.h>
#define bool int
#define TRUE 1
#define FALSE 0
#define EOS '\0'
bool opterr = TRUE; /* generate error messages */
int optind = 1; /* index into argv array */
char * optarg = NULL; /* optional argument */
int getopt(int argc, char *argv[], const char optstring[])
{
static char *opt_ptr = "";
register char *ptr;
int option;
if (*opt_ptr == EOS) {
if (optind >= argc || argv[optind][0] != '-')
return -1;
else if (strcmp(argv[optind], "--") == 0) {
++optind;
return -1;
}
opt_ptr = argv[optind++] + 1;
}
if ((ptr = strchr(optstring, option = *opt_ptr++)) == NULL) {
if (opterr)
fprintf(stderr, "Unknown option: -%c\n", option);
return '?';
}
if (*(ptr + 1) == ':') {
if (optind >= argc) {
if (opterr)
fprintf(stderr, "Argument expected for the -%c option\n", option);
return '?';
}
optarg = argv[optind++];
}
return option;
}
|
