1 /* 2 * Copyright (c) 1987, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)getopt.c 8.1 (Berkeley) 06/04/93"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <stdio.h> 13 #include <stdlib.h> 14 #include <string.h> 15 16 /* 17 * get option letter from argument vector 18 */ 19 int opterr = 1, /* if error message should be printed */ 20 optind = 1, /* index into parent argv vector */ 21 optopt, /* character checked for validity */ 22 optreset; /* reset getopt */ 23 char *optarg; /* argument associated with option */ 24 25 #define BADCH (int)'?' 26 #define BADARG (int)':' 27 #define EMSG "" 28 29 int 30 getopt(nargc, nargv, ostr) 31 int nargc; 32 char * const *nargv; 33 const char *ostr; 34 { 35 static char *place = EMSG; /* option letter processing */ 36 register char *oli; /* option letter list index */ 37 char *p; 38 39 if (optreset || !*place) { /* update scanning pointer */ 40 optreset = 0; 41 if (optind >= nargc || *(place = nargv[optind]) != '-') { 42 place = EMSG; 43 return(EOF); 44 } 45 if (place[1] && *++place == '-') { /* found "--" */ 46 ++optind; 47 place = EMSG; 48 return(EOF); 49 } 50 } /* option letter okay? */ 51 if ((optopt = (int)*place++) == (int)':' || 52 !(oli = index(ostr, optopt))) { 53 /* 54 * if the user didn't specify '-' as an option, 55 * assume it means EOF. 56 */ 57 if (optopt == (int)'-') 58 return(EOF); 59 if (!*place) 60 ++optind; 61 if (opterr && *ostr != ':') { 62 if (!(p = rindex(*nargv, '/'))) 63 p = *nargv; 64 else 65 ++p; 66 (void)fprintf(stderr, "%s: illegal option -- %c\n", 67 p, optopt); 68 } 69 return(BADCH); 70 } 71 if (*++oli != ':') { /* don't need argument */ 72 optarg = NULL; 73 if (!*place) 74 ++optind; 75 } 76 else { /* need an argument */ 77 if (*place) /* no white space */ 78 optarg = place; 79 else if (nargc <= ++optind) { /* no arg */ 80 place = EMSG; 81 if (!(p = rindex(*nargv, '/'))) 82 p = *nargv; 83 else 84 ++p; 85 if (*ostr == ':') 86 return(BADARG); 87 if (opterr) 88 (void)fprintf(stderr, 89 "%s: option requires an argument -- %c\n", 90 p, optopt); 91 return(BADCH); 92 } 93 else /* white space */ 94 optarg = nargv[optind]; 95 place = EMSG; 96 ++optind; 97 } 98 return(optopt); /* dump back option letter */ 99 } 100