1 /*
2 * getopt - get option letter from argv
3 *
4 * This is a version of the public domain getopt() implementation by
5 * Henry Spencer, changed for 4.3BSD compatibility (in addition to System V).
6 * It allows rescanning of an option list by setting optind to 0 before
7 * calling, which is why we use it even if the system has its own (in fact,
8 * this one has a unique name so as not to conflict with the system's).
9 * Thanks to Dennis Ferguson for the appropriate modifications.
10 *
11 * This file is in the Public Domain.
12 */
13
14 /*LINTLIBRARY*/
15
16 #include <stdio.h>
17
18 #ifdef lint
19 #undef putc
20 #define putc fputc
21 #endif /* lint */
22
23 char *ntp_optarg; /* Global argument pointer. */
24 int ntp_optind = 0; /* Global argv index. */
25 int ntp_opterr = 1; /* for compatibility, should error be printed? */
26 int ntp_optopt; /* for compatibility, option character checked */
27
28 static char *scan = NULL; /* Private scan pointer. */
29 static const char *prog = "amnesia";
30
31 /*
32 * Print message about a bad option.
33 */
34 static int
badopt(const char * mess,int ch)35 badopt(
36 const char *mess,
37 int ch
38 )
39 {
40 if (ntp_opterr) {
41 fputs(prog, stderr);
42 fputs(mess, stderr);
43 (void) putc(ch, stderr);
44 (void) putc('\n', stderr);
45 }
46 return ('?');
47 }
48
49 int
ntp_getopt(int argc,char * argv[],const char * optstring)50 ntp_getopt(
51 int argc,
52 char *argv[],
53 const char *optstring
54 )
55 {
56 register char c;
57 register const char *place;
58
59 prog = argv[0];
60 ntp_optarg = NULL;
61
62 if (ntp_optind == 0) {
63 scan = NULL;
64 ntp_optind++;
65 }
66
67 if (scan == NULL || *scan == '\0') {
68 if (ntp_optind >= argc
69 || argv[ntp_optind][0] != '-'
70 || argv[ntp_optind][1] == '\0') {
71 return (EOF);
72 }
73 if (argv[ntp_optind][1] == '-'
74 && argv[ntp_optind][2] == '\0') {
75 ntp_optind++;
76 return (EOF);
77 }
78
79 scan = argv[ntp_optind++]+1;
80 }
81
82 c = *scan++;
83 ntp_optopt = c & 0377;
84 for (place = optstring; place != NULL && *place != '\0'; ++place)
85 if (*place == c)
86 break;
87
88 if (place == NULL || *place == '\0' || c == ':' || c == '?') {
89 return (badopt(": unknown option -", c));
90 }
91
92 place++;
93 if (*place == ':') {
94 if (*scan != '\0') {
95 ntp_optarg = scan;
96 scan = NULL;
97 } else if (ntp_optind >= argc) {
98 return (badopt(": option requires argument -", c));
99 } else {
100 ntp_optarg = argv[ntp_optind++];
101 }
102 }
103
104 return (c & 0377);
105 }
106