101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
/* NetBSD getopt.c */
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <getopt.h>
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inline
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const char* _getprogname()
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{ return "getopt";
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}
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int opterr = 1; /* if error message should be printed */
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int optind = 1; /* index into parent argv vector */
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int optopt = 0; /* character checked for validity */
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int optreset = 0; /* reset getopt */
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const char *optarg = ""; /* argument associated with option */
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#define BADCH (int)'?'
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#define BADARG (int)':'
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#define EMSG ""
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/*
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* getopt --
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* Parse argc/argv argument vector.
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*/
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CFUNC int
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getopt(int nargc,char * const nargv[],const char *ostr)
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{
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static const char *place = EMSG; /* option letter processing */
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const char *oli; /* option letter list index */
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if (optreset || *place == 0) { /* update scanning pointer */
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optreset = 0;
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place = nargv[optind];
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if (optind >= nargc || *place++ != '-') {
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/* Argument is absent or is not an option */
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place = EMSG;
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return (-1);
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}
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optopt = *place++;
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if (optopt == '-' && *place == 0) {
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/* "--" => end of options */
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++optind;
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place = EMSG;
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return (-1);
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}
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if (optopt == 0) {
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/* Solitary '-', treat as a '-' option
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if the program (eg su) is looking for it. */
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place = EMSG;
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if (strchr(ostr, '-') == NULL)
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return (-1);
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optopt = '-';
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}
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} else
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optopt = *place++;
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/* See if option letter is one the caller wanted... */
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if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
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if (*place == 0)
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++optind;
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if (opterr && *ostr != ':')
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(void)fprintf(stderr,
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"%s: illegal option -- %c\n", _getprogname(),
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optopt);
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return (BADCH);
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}
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/* Does this option need an argument? */
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if (oli[1] != ':') {
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/* don't need argument */
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optarg = NULL;
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if (*place == 0)
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++optind;
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} else {
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/* Option-argument is either the rest of this argument or the
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entire next argument. */
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if (*place)
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optarg = place;
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else if (nargc > ++optind)
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optarg = nargv[optind];
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else {
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/* option-argument absent */
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place = EMSG;
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if (*ostr == ':')
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return (BADARG);
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if (opterr)
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(void)fprintf(stderr,
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"%s: option requires an argument -- %c\n",
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_getprogname(), optopt);
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return (BADCH);
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}
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place = EMSG;
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++optind;
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}
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return (optopt); /* return option letter */
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}
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