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 4.8 (Berkeley) 03/05/89"; 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 *index(); 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 if (!*place) 54 ++optind; 55 if (opterr) 56 (void)fprintf(stderr, "%s: illegal option -- %c\n", 57 *nargv, optopt); 58 return(BADCH); 59 } 60 if (*++oli != ':') { /* don't need argument */ 61 optarg = NULL; 62 if (!*place) 63 ++optind; 64 } 65 else { /* need an argument */ 66 if (*place) /* no white space */ 67 optarg = place; 68 else if (nargc <= ++optind) { /* no arg */ 69 place = EMSG; 70 if (opterr) 71 (void)fprintf(stderr, 72 "%s: option requires an argument -- %c\n", 73 *nargv, optopt); 74 return(BADCH); 75 } 76 else /* white space */ 77 optarg = nargv[optind]; 78 place = EMSG; 79 ++optind; 80 } 81 return(optopt); /* dump back option letter */ 82 } 83