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 4.10 (Berkeley) 12/14/89"; 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 return(EOF); 46 if (place[1] && *++place == '-') { /* found "--" */ 47 ++optind; 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) { 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 (opterr) 86 (void)fprintf(stderr, 87 "%s: option requires an argument -- %c\n", 88 p, optopt); 89 return(BADCH); 90 } 91 else /* white space */ 92 optarg = nargv[optind]; 93 place = EMSG; 94 ++optind; 95 } 96 return(optopt); /* dump back option letter */ 97 } 98