2 * Portions Copyright (C) 2004, 2005, 2007, 2008 Internet Systems Consortium, Inc. ("ISC")
3 * Portions Copyright (C) 1999-2001 Internet Software Consortium.
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15 * PERFORMANCE OF THIS SOFTWARE.
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51 /* $Id: commandline.c,v 1.22 2008/09/25 04:02:39 tbox Exp $ */
54 * This file was adapted from the NetBSD project's source tree, RCS ID:
55 * NetBSD: getopt.c,v 1.15 1999/09/20 04:39:37 lukem Exp
57 * The primary change has been to rename items to the ISC namespace
58 * and format in the ISC coding style.
62 * \author Principal Authors: Computer Systems Research Group at UC Berkeley
63 * \author Principal ISC caretaker: DCL
70 #include <isc/commandline.h>
72 #include <isc/string.h>
75 /*% Index into parent argv vector. */
76 LIBISC_EXTERNAL_DATA int isc_commandline_index = 1;
77 /*% Character checked for validity. */
78 LIBISC_EXTERNAL_DATA int isc_commandline_option;
79 /*% Argument associated with option. */
80 LIBISC_EXTERNAL_DATA char *isc_commandline_argument;
81 /*% For printing error messages. */
82 LIBISC_EXTERNAL_DATA char *isc_commandline_progname;
83 /*% Print error messages. */
84 LIBISC_EXTERNAL_DATA isc_boolean_t isc_commandline_errprint = ISC_TRUE;
85 /*% Reset processing. */
86 LIBISC_EXTERNAL_DATA isc_boolean_t isc_commandline_reset = ISC_TRUE;
88 static char endopt = '\0';
92 #define ENDOPT &endopt
96 * Parse argc/argv argument vector.
99 isc_commandline_parse(int argc, char * const *argv, const char *options) {
100 static char *place = ENDOPT;
101 char *option; /* Index into *options of option. */
103 REQUIRE(argc >= 0 && argv != NULL && options != NULL);
106 * Update scanning pointer, either because a reset was requested or
107 * the previous argv was finished.
109 if (isc_commandline_reset || *place == '\0') {
110 if (isc_commandline_reset) {
111 isc_commandline_index = 1;
112 isc_commandline_reset = ISC_FALSE;
115 if (isc_commandline_progname == NULL)
116 isc_commandline_progname = argv[0];
118 if (isc_commandline_index >= argc ||
119 *(place = argv[isc_commandline_index]) != '-') {
121 * Index out of range or points to non-option.
127 if (place[1] != '\0' && *++place == '-' && place[1] == '\0') {
129 * Found '--' to signal end of options. Advance
130 * index to next argv, the first non-option.
132 isc_commandline_index++;
138 isc_commandline_option = *place++;
139 option = strchr(options, isc_commandline_option);
142 * Ensure valid option has been passed as specified by options string.
143 * '-:' is never a valid command line option because it could not
144 * distinguish ':' from the argument specifier in the options string.
146 if (isc_commandline_option == ':' || option == NULL) {
148 isc_commandline_index++;
150 if (isc_commandline_errprint && *options != ':')
151 fprintf(stderr, "%s: %s -- %c\n",
152 isc_commandline_progname,
153 isc_msgcat_get(isc_msgcat,
154 ISC_MSGSET_COMMANDLINE,
157 isc_commandline_option);
162 if (*++option != ':') {
164 * Option does not take an argument.
166 isc_commandline_argument = NULL;
169 * Skip to next argv if at the end of the current argv.
172 ++isc_commandline_index;
176 * Option needs an argument.
180 * Option is in this argv, -D1 style.
182 isc_commandline_argument = place;
184 else if (argc > ++isc_commandline_index)
186 * Option is next argv, -D 1 style.
188 isc_commandline_argument = argv[isc_commandline_index];
192 * Argument needed, but no more argv.
197 * Silent failure with "missing argument" return
198 * when ':' starts options string, per historical spec.
203 if (isc_commandline_errprint)
204 fprintf(stderr, "%s: %s -- %c\n",
205 isc_commandline_progname,
206 isc_msgcat_get(isc_msgcat,
207 ISC_MSGSET_COMMANDLINE,
211 isc_commandline_option);
219 * Point to argv that follows argument.
221 isc_commandline_index++;
224 return (isc_commandline_option);