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73 lines
1.9 KiB
73 lines
1.9 KiB
#include <string.h> |
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#include <stdio.h> |
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// global |
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int opterr = 1, /* if error message should be printed */ |
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optind = 1, /* index into parent argv vector */ |
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optopt, /* character checked for validity */ |
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optreset; /* 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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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) { /* update scanning pointer */ |
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optreset = 0; |
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if (optind >= nargc || *(place = nargv[optind]) != '-') { |
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place = EMSG; |
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return (-1); |
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} |
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if (place[1] && *++place == '-') { /* found "--" */ |
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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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} /* option letter okay? */ |
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if ((optopt = (int)*place++) == (int)':' || |
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!(oli = strchr (ostr, optopt))) { |
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/* |
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* if the user didn't specify '-' as an option, |
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* assume it means -1. |
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*/ |
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if (optopt == (int)'-') |
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return (-1); |
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if (!*place) |
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++optind; |
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if (opterr && *ostr != ':') |
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(void)printf ("illegal option -- %c\n", optopt); |
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return (BADCH); |
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} |
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if (*++oli != ':') { /* don't need argument */ |
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optarg = NULL; |
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if (!*place) |
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++optind; |
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} |
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else { /* need an argument */ |
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if (*place) /* no white space */ |
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optarg = place; |
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else if (nargc <= ++optind) { /* no arg */ |
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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)printf ("option requires an argument -- %c\n", optopt); |
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return (BADCH); |
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} |
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else /* white space */ |
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optarg = nargv[optind]; |
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place = EMSG; |
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++optind; |
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} |
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return optopt; /* dump back option letter */ |
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}
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