1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
22 * @brief APR Command Arguments (getopt)
25 #include "apr_pools.h"
29 #endif /* __cplusplus */
32 * @defgroup apr_getopt Command Argument Parsing
38 * An @c apr_getopt_t error callback function.
40 * @a arg is this @c apr_getopt_t's @c errarg member.
42 typedef void (apr_getopt_err_fn_t)(void *arg, const char *err, ...);
44 /** @see apr_getopt_t */
45 typedef struct apr_getopt_t apr_getopt_t;
48 * Structure to store command line argument information.
51 /** context for processing */
53 /** function to print error message (NULL == no messages) */
54 apr_getopt_err_fn_t *errfn;
55 /** user defined first arg to pass to error message */
57 /** index into parent argv vector */
59 /** character checked for validity */
63 /** count of arguments */
65 /** array of pointers to arguments */
67 /** argument associated with option */
69 /** set to nonzero to support interleaving options with regular args */
71 /** start of non-option arguments skipped for interleaving */
73 /** end of non-option arguments skipped for interleaving */
77 /** @see apr_getopt_option_t */
78 typedef struct apr_getopt_option_t apr_getopt_option_t;
81 * Structure used to describe options that getopt should search for.
83 struct apr_getopt_option_t {
84 /** long option name, or NULL if option has no long name */
86 /** option letter, or a value greater than 255 if option has no letter */
88 /** nonzero if option takes an argument */
90 /** a description of the option */
91 const char *description;
95 * Initialize the arguments for parsing by apr_getopt().
96 * @param os The options structure created for apr_getopt()
97 * @param cont The pool to operate on
98 * @param argc The number of arguments to parse
99 * @param argv The array of arguments to parse
100 * @remark Arguments 3 and 4 are most commonly argc and argv from main(argc, argv)
101 * The (*os)->errfn is initialized to fprintf(stderr... but may be overridden.
103 APR_DECLARE(apr_status_t) apr_getopt_init(apr_getopt_t **os, apr_pool_t *cont,
104 int argc, const char * const *argv);
107 * Parse the options initialized by apr_getopt_init().
108 * @param os The apr_opt_t structure returned by apr_getopt_init()
109 * @param opts A string of characters that are acceptable options to the
110 * program. Characters followed by ":" are required to have an
112 * @param option_ch The next option character parsed
113 * @param option_arg The argument following the option character:
114 * @return There are four potential status values on exit. They are:
116 * APR_EOF -- No more options to parse
117 * APR_BADCH -- Found a bad option character
118 * APR_BADARG -- No argument followed the option flag
119 * APR_SUCCESS -- The next option was found.
122 APR_DECLARE(apr_status_t) apr_getopt(apr_getopt_t *os, const char *opts,
123 char *option_ch, const char **option_arg);
126 * Parse the options initialized by apr_getopt_init(), accepting long
127 * options beginning with "--" in addition to single-character
128 * options beginning with "-".
129 * @param os The apr_getopt_t structure created by apr_getopt_init()
130 * @param opts A pointer to a list of apr_getopt_option_t structures, which
131 * can be initialized with { "name", optch, has_args }. has_args
132 * is nonzero if the option requires an argument. A structure
133 * with an optch value of 0 terminates the list.
134 * @param option_ch Receives the value of "optch" from the apr_getopt_option_t
135 * structure corresponding to the next option matched.
136 * @param option_arg Receives the argument following the option, if any.
137 * @return There are four potential status values on exit. They are:
139 * APR_EOF -- No more options to parse
140 * APR_BADCH -- Found a bad option character
141 * APR_BADARG -- No argument followed the option flag
142 * APR_SUCCESS -- The next option was found.
144 * When APR_SUCCESS is returned, os->ind gives the index of the first
145 * non-option argument. On error, a message will be printed to stdout unless
146 * os->err is set to 0. If os->interleave is set to nonzero, options can come
147 * after arguments, and os->argv will be permuted to leave non-option arguments
148 * at the end (the original argv is unaffected).
150 APR_DECLARE(apr_status_t) apr_getopt_long(apr_getopt_t *os,
151 const apr_getopt_option_t *opts,
153 const char **option_arg);
160 #endif /* ! APR_GETOPT_H */