1 /* 2 * Copyright (c) 1987 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)getopt.c 4.11 (Berkeley) 02/20/90"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 #include <stdio.h> 23 24 /* 25 * get option letter from argument vector 26 */ 27 int opterr = 1, /* if error message should be printed */ 28 optind = 1, /* index into parent argv vector */ 29 optopt; /* character checked for validity */ 30 char *optarg; /* argument associated with option */ 31 32 #define BADCH (int)'?' 33 #define EMSG "" 34 35 getopt(nargc, nargv, ostr) 36 int nargc; 37 char **nargv, *ostr; 38 { 39 static char *place = EMSG; /* option letter processing */ 40 register char *oli; /* option letter list index */ 41 char *p, *index(), *rindex(); 42 43 if (!*place) { /* update scanning pointer */ 44 if (optind >= nargc || *(place = nargv[optind]) != '-') { 45 place = EMSG; 46 return(EOF); 47 } 48 if (place[1] && *++place == '-') { /* found "--" */ 49 ++optind; 50 place = EMSG; 51 return(EOF); 52 } 53 } /* option letter okay? */ 54 if ((optopt = (int)*place++) == (int)':' || 55 !(oli = index(ostr, optopt))) { 56 /* 57 * if the user didn't specify '-' as an option, 58 * assume it means EOF. 59 */ 60 if (optopt == (int)'-') 61 return(EOF); 62 if (!*place) 63 ++optind; 64 if (opterr) { 65 if (!(p = rindex(*nargv, '/'))) 66 p = *nargv; 67 else 68 ++p; 69 (void)fprintf(stderr, "%s: illegal option -- %c\n", 70 p, optopt); 71 } 72 return(BADCH); 73 } 74 if (*++oli != ':') { /* don't need argument */ 75 optarg = NULL; 76 if (!*place) 77 ++optind; 78 } 79 else { /* need an argument */ 80 if (*place) /* no white space */ 81 optarg = place; 82 else if (nargc <= ++optind) { /* no arg */ 83 place = EMSG; 84 if (!(p = rindex(*nargv, '/'))) 85 p = *nargv; 86 else 87 ++p; 88 if (opterr) 89 (void)fprintf(stderr, 90 "%s: option requires an argument -- %c\n", 91 p, optopt); 92 return(BADCH); 93 } 94 else /* white space */ 95 optarg = nargv[optind]; 96 place = EMSG; 97 ++optind; 98 } 99 return(optopt); /* dump back option letter */ 100 } 101