File size: 4,836 Bytes
8be366a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 | /* -*- mode: C; c-file-style: "gnu" -*- */
/*
* Copyright (C) 2011 Dirk Dierckx <dirk.dierckx@gmail.com>
*
* This file is part of bookie.
*
* bookie is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* bookie is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with bookie. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h> /* assert */
#include <errno.h>
#include <stdlib.h> /* malloc, free */
#include <stdio.h> /* printf, fprintf, sprintf */
#include <string.h> /* memset, strcmp, strlen */
#include <ctype.h> /* isalnum */
#include "arguments.h"
static
size_t
_print_option (char *buffer, struct arguments_option *option)
{
bool has_short = isalnum (option->short_opt);
bool has_long = NULL != option->long_opt;
bool has_arg = (no_argument != option->has_arg
&& NULL != option->arg_name);
assert (has_short || has_long);
sprintf (buffer, "%c%c%s%s%s%s%s",
(has_short ? '-' : ' '),
(has_short ? option->short_opt : ' '),
(has_short && has_long
? ", "
: (has_long ? " " : "")),
(has_long ? "--" : ""),
(has_long ? option->long_opt : ""),
(has_arg ? "=" : ""),
(has_arg ? option->arg_name : ""));
return strlen (buffer);
}
void
print_usage (struct arguments_definition *def,
const char *command)
{
char *prev_cat = NULL;
size_t i, len, max_len = 0;
char option[80], padding[80];
if (NULL != def->print_usage_header)
def->print_usage_header (command);
else if (NULL == def->options[0].cat)
printf ("Usage: %s\n", command);
else
printf ("Usage: %s [OPTION]...\n", command);
for (i = 0;NULL != def->options[i].cat;++i) {
len = _print_option (option, def->options + i);
if (len > max_len)
max_len = len;
}
memset (padding, ' ', sizeof (padding));
padding[sizeof (padding) - 1] = '\0';
for (i = 0;NULL != def->options[i].cat;++i) {
if (NULL == prev_cat || 0 != strcmp (prev_cat, def->options[i].cat)) {
printf ("\n%s:\n", def->options[i].cat);
prev_cat = def->options[i].cat;
}
len = _print_option (option, def->options + i);
padding[max_len - len] = '\0';
printf (" %s%s %s\n", option, padding, def->options[i].desc);
padding[max_len - len] = ' ';
}
printf ("\n");
}
bool
get_arguments (struct arguments_definition *def, int argc, char *argv[])
{
bool go_on = false;
size_t i, count = 0;
struct option *opts;
char *optstring;
assert (NULL != def);
for (i = 0;NULL != def->options[i].cat;++i)
if (NULL != def->options[i].long_opt)
++count;
opts = (struct option *) malloc (sizeof (struct option) * (count + 1));
if (NULL == opts) {
fprintf (stderr, "Could not allocate memory because: %s\n",
strerror (errno));
} else {
memset (opts, 0, sizeof (struct option) * (count + 1));
for (i = 0;NULL != def->options[i].cat;++i)
if (isalnum (def->options[i].short_opt))
++count;
optstring = (char *) malloc ((count + 1) * 3);
if (NULL == optstring) {
fprintf (stderr, "Could not allocate memory because: %s\n",
strerror (errno));
} else {
size_t s = 0, l = 0;
int opt;
memset (optstring, 0, (count + 1) * 3);
for (i = 0;NULL != def->options[i].cat;++i) {
if (isalnum (def->options[i].short_opt)) {
optstring[s++] = def->options[i].short_opt;
switch (def->options[i].has_arg) {
case optional_argument:
optstring[s++] = ':';
case required_argument:
optstring[s++] = ':';
case no_argument:
break;
default:
assert (false); /* invalid has_arg value */
break;
}
}
if (NULL != def->options[i].long_opt) {
opts[l].name = def->options[i].long_opt;
opts[l].has_arg = def->options[i].has_arg;
opts[l].flag = NULL;
opts[l].val = def->options[i].short_opt;
++l;
}
}
for (go_on = true;
go_on
&& -1 != (opt = getopt_long (argc, argv, optstring, opts, NULL));)
go_on = def->process_option (def, opt, optarg, argc, argv);
if (go_on && optind < argc && NULL != def->process_non_options)
go_on = def->process_non_options (def, optind, argc, argv);
free (optstring);
}
free (opts);
}
return go_on;
}
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