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105 lines
3 KiB
C
105 lines
3 KiB
C
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/*
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* * @(#)getopt.c 2.3 (smail) 5/30/87
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*/
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/*
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* Here's something you've all been waiting for: the AT&T public domain
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* source for getopt(3). It is the code which was given out at the 1985
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* UNIFORUM conference in Dallas. I obtained it by electronic mail directly
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* from AT&T. The people there assure me that it is indeed in the public
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* domain.
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*
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* There is no manual page. That is because the one they gave out at UNIFORUM
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* was slightly different from the current System V Release 2 manual page.
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* The difference apparently involved a note about the famous rules 5 and 6,
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* recommending using white space between an option and its first argument,
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* and not grouping options that have arguments. Getopt itself is currently
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* lenient about both of these things White space is allowed, but not
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* mandatory, and the last option in a group can have an argument. That
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* particular version of the man page evidently has no official existence,
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* and my source at AT&T did not send a copy. The current SVR2 man page
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* reflects the actual behavior of this getopt. However, I am not about to
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* post a copy of anything licensed by AT&T.
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*/
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#ifdef BSD
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#include <strings.h>
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#else
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#define index strchr
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#include <string.h>
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#endif
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/* LINTLIBRARY */
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#ifndef NULL
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#define NULL 0
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#endif
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#define EOF (-1)
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#define ERR(s, c) if(opterr){\
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extern int write(int, void *, unsigned);\
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char errbuf[2];\
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errbuf[0] = (char)c; errbuf[1] = '\n';\
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(void) write(2, strlwr(argv[0]), (unsigned)strlen(argv[0]));\
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(void) write(2, s, (unsigned)strlen(s));\
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(void) write(2, errbuf, 2);}
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extern char *index();
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int opterr = 1;
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int optind = 1;
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int optopt;
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char *optarg;
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int getopt(int argc, char *argv[], char *opts)
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{
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static int sp = 1;
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register int c;
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register char *cp;
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if (sp == 1)
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{
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if (optind >= argc || argv[optind][0] != '-' ||
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argv[optind][1] == '\0')
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return (EOF);
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else if (strcmp(argv[optind], "--") == 0)
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{
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optind++;
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return (EOF);
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}
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}
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optopt = c = argv[optind][sp];
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if (c == ':' || (cp = index(opts, c)) == NULL)
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{
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ERR(": illegal option -- ", c);
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if (argv[optind][++sp] == '\0')
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{
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optind++;
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sp = 1;
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}
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return ('?');
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}
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if (*++cp == ':')
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{
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if (argv[optind][sp + 1] != '\0')
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optarg = &argv[optind++][sp + 1];
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else if (++optind >= argc)
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{
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ERR(": option requires an argument -- ", c);
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sp = 1;
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return ('?');
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}
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else optarg = argv[optind++];
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sp = 1;
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}
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else
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{
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if (argv[optind][++sp] == '\0')
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{
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sp = 1;
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optind++;
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}
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optarg = NULL;
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}
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return (c);
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}
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