109 lines
1.9 KiB
C
109 lines
1.9 KiB
C
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/*
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getopt.c
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modified public-domain AT&T getopt(3)
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*/
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#include <stdio.h>
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#include <string.h>
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#ifdef _POSIX_SOURCE
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# include <unistd.h>
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#else
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# define STDERR_FILENO 2
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# ifdef __STDC__
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extern int write (int fildes, char * buf, unsigned nbyte);
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# else
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extern int write ();
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# endif
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#endif
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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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#ifdef __STDC__
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static void ERR (char ** argv, char * s, char c)
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#else
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static void ERR (argv, s, c)
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char ** argv, * s, c;
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#endif
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{
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char errbuf[2];
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#ifdef DF_TRACE_DEBUG
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printf("DF_TRACE_DEBUG: static void ERR () in getopt.c\n");
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#endif
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if (opterr)
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{
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errbuf[0] = c;
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errbuf[1] = '\n';
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(void) write(STDERR_FILENO,argv[0],strlen(argv[0]));
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(void) write(STDERR_FILENO,s,strlen(s));
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(void) write(STDERR_FILENO,errbuf,sizeof errbuf);
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}
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}
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#ifdef __STDC__
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int getopt (int argc, char ** argv, char * opts)
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#else
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int getopt (argc, argv, opts)
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int argc;
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char ** argv, * opts;
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#endif
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{
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static int sp = 1, error = (int) '?';
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static char sw = '-', eos = '\0', arg = ':';
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register char c, * cp;
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#ifdef DF_TRACE_DEBUG
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printf("DF_TRACE_DEBUG: int getopt () in getopt.c\n");
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#endif
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if (sp == 1)
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if (optind >= argc || argv[optind][0] != sw
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|| argv[optind][1] == eos)
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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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c = argv[optind][sp];
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optopt = (int) c;
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if (c == arg || (cp = strchr(opts,c)) == NULL)
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{
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ERR(argv,": illegal option--",c);
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if (argv[optind][++sp] == eos)
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{
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optind++;
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sp = 1;
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}
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return error;
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}
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else if (*++cp == arg)
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{
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if (argv[optind][sp + 1] != eos)
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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(argv,": option requires an argument--",c);
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sp = 1;
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return error;
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}
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else
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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] == eos)
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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 (int) c;
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}
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