Annotation of embedaddon/ntp/libntp/getopt.c, revision 1.1.1.1
1.1 misho 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: #include "ntp_stdlib.h"
19:
20: #ifdef lint
21: #undef putc
22: #define putc fputc
23: #endif /* lint */
24:
25: char *ntp_optarg; /* Global argument pointer. */
26: int ntp_optind = 0; /* Global argv index. */
27: int ntp_opterr = 1; /* for compatibility, should error be printed? */
28: int ntp_optopt; /* for compatibility, option character checked */
29:
30: static char *scan = NULL; /* Private scan pointer. */
31: static const char *prog = "amnesia";
32:
33: /*
34: * Print message about a bad option.
35: */
36: static int
37: badopt(
38: const char *mess,
39: int ch
40: )
41: {
42: if (ntp_opterr) {
43: fputs(prog, stderr);
44: fputs(mess, stderr);
45: (void) putc(ch, stderr);
46: (void) putc('\n', stderr);
47: }
48: return ('?');
49: }
50:
51: int
52: ntp_getopt(
53: int argc,
54: char *argv[],
55: const char *optstring
56: )
57: {
58: register char c;
59: register const char *place;
60:
61: prog = argv[0];
62: ntp_optarg = NULL;
63:
64: if (ntp_optind == 0) {
65: scan = NULL;
66: ntp_optind++;
67: }
68:
69: if (scan == NULL || *scan == '\0') {
70: if (ntp_optind >= argc
71: || argv[ntp_optind][0] != '-'
72: || argv[ntp_optind][1] == '\0') {
73: return (EOF);
74: }
75: if (argv[ntp_optind][1] == '-'
76: && argv[ntp_optind][2] == '\0') {
77: ntp_optind++;
78: return (EOF);
79: }
80:
81: scan = argv[ntp_optind++]+1;
82: }
83:
84: c = *scan++;
85: ntp_optopt = c & 0377;
86: for (place = optstring; place != NULL && *place != '\0'; ++place)
87: if (*place == c)
88: break;
89:
90: if (place == NULL || *place == '\0' || c == ':' || c == '?') {
91: return (badopt(": unknown option -", c));
92: }
93:
94: place++;
95: if (*place == ':') {
96: if (*scan != '\0') {
97: ntp_optarg = scan;
98: scan = NULL;
99: } else if (ntp_optind >= argc) {
100: return (badopt(": option requires argument -", c));
101: } else {
102: ntp_optarg = argv[ntp_optind++];
103: }
104: }
105:
106: return (c & 0377);
107: }
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