/contrib/ntp/libntp/getopt.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 107 lines · 75 code · 16 blank · 16 comment · 37 complexity · 4afac7b1782cb29c8cdbd004a0fd8c92 MD5 · raw file
- /*
- * getopt - get option letter from argv
- *
- * This is a version of the public domain getopt() implementation by
- * Henry Spencer, changed for 4.3BSD compatibility (in addition to System V).
- * It allows rescanning of an option list by setting optind to 0 before
- * calling, which is why we use it even if the system has its own (in fact,
- * this one has a unique name so as not to conflict with the system's).
- * Thanks to Dennis Ferguson for the appropriate modifications.
- *
- * This file is in the Public Domain.
- */
- /*LINTLIBRARY*/
- #include <stdio.h>
- #include "ntp_stdlib.h"
- #ifdef lint
- #undef putc
- #define putc fputc
- #endif /* lint */
- char *ntp_optarg; /* Global argument pointer. */
- int ntp_optind = 0; /* Global argv index. */
- int ntp_opterr = 1; /* for compatibility, should error be printed? */
- int ntp_optopt; /* for compatibility, option character checked */
- static char *scan = NULL; /* Private scan pointer. */
- static const char *prog = "amnesia";
- /*
- * Print message about a bad option.
- */
- static int
- badopt(
- const char *mess,
- int ch
- )
- {
- if (ntp_opterr) {
- fputs(prog, stderr);
- fputs(mess, stderr);
- (void) putc(ch, stderr);
- (void) putc('\n', stderr);
- }
- return ('?');
- }
- int
- ntp_getopt(
- int argc,
- char *argv[],
- const char *optstring
- )
- {
- register char c;
- register const char *place;
- prog = argv[0];
- ntp_optarg = NULL;
- if (ntp_optind == 0) {
- scan = NULL;
- ntp_optind++;
- }
-
- if (scan == NULL || *scan == '\0') {
- if (ntp_optind >= argc
- || argv[ntp_optind][0] != '-'
- || argv[ntp_optind][1] == '\0') {
- return (EOF);
- }
- if (argv[ntp_optind][1] == '-'
- && argv[ntp_optind][2] == '\0') {
- ntp_optind++;
- return (EOF);
- }
-
- scan = argv[ntp_optind++]+1;
- }
- c = *scan++;
- ntp_optopt = c & 0377;
- for (place = optstring; place != NULL && *place != '\0'; ++place)
- if (*place == c)
- break;
- if (place == NULL || *place == '\0' || c == ':' || c == '?') {
- return (badopt(": unknown option -", c));
- }
- place++;
- if (*place == ':') {
- if (*scan != '\0') {
- ntp_optarg = scan;
- scan = NULL;
- } else if (ntp_optind >= argc) {
- return (badopt(": option requires argument -", c));
- } else {
- ntp_optarg = argv[ntp_optind++];
- }
- }
- return (c & 0377);
- }