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 4.7 (Berkeley) 06/27/88"; 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 #define tell(s) { \ 35 if (opterr) { \ 36 fputs(*nargv, stderr); \ 37 fputs(s, stderr); \ 38 fputc(optopt, stderr); \ 39 fputc((int)'\n', stderr); \ 40 } \ 41 return(BADCH); \ 42 } 43 44 getopt(nargc, nargv, ostr) 45 int nargc; 46 char **nargv, *ostr; 47 { 48 static char *place = EMSG; /* option letter processing */ 49 register char *oli; /* option letter list index */ 50 char *index(); 51 52 if (!*place) { /* update scanning pointer */ 53 if (optind >= nargc || *(place = nargv[optind]) != '-') 54 return(EOF); 55 if (place[1] && *++place == '-') { /* found "--" */ 56 ++optind; 57 return(EOF); 58 } 59 } /* option letter okay? */ 60 if ((optopt = (int)*place++) == (int)':' || 61 !(oli = index(ostr, optopt))) { 62 if (!*place) 63 ++optind; 64 tell(": illegal option -- "); 65 } 66 if (*++oli != ':') { /* don't need argument */ 67 optarg = NULL; 68 if (!*place) 69 ++optind; 70 } 71 else { /* need an argument */ 72 if (*place) /* no white space */ 73 optarg = place; 74 else if (nargc <= ++optind) { /* no arg */ 75 place = EMSG; 76 tell(": option requires an argument -- "); 77 } 78 else /* white space */ 79 optarg = nargv[optind]; 80 place = EMSG; 81 ++optind; 82 } 83 return(optopt); /* dump back option letter */ 84 } 85