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//
// opts.c
//
// Option string parsing
//
// Copyright (C) 2002 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the project nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
#include <string.h>
#include <stdlib.h>
char *get_option(char *opts, char *name, char *buffer, int size, char *defval) {
char *eq;
char *p;
if (!opts) {
if (!defval) return NULL;
strncpy(buffer, defval, size);
return buffer;
}
while (*opts) {
while (*opts == ' ') opts++;
p = opts;
while (*p != 0 && *p != ',') p++;
eq = opts;
while (*eq != 0 && *eq != '=') eq++;
if (*eq == '=') {
if (strncmp(name, opts, eq - opts) == 0) {
if (!buffer) return eq + 1;
if (p - (eq + 1) > size) {
strncpy(buffer, eq + 1, size);
} else {
memcpy(buffer, eq + 1, p - (eq + 1));
buffer[p - (eq + 1)] = 0;
}
return buffer;
}
} else {
if (strncmp(name, opts, p - opts) == 0) {
if (!buffer) return "";
*buffer = 0;
return buffer;
}
}
opts = p;
if (*opts == ',') opts++;
}
if (!defval) return NULL;
if (buffer) strncpy(buffer, defval, size);
return buffer;
}
int get_num_option(char *opts, char *name, int defval) {
char buffer[32];
char *p;
int value;
p = get_option(opts, name, buffer, 32, NULL);
if (!p) return defval;
while (*p == ' ') p++;
if (p[0] == '0' && p[1] == 'x') {
p += 2;
value = 0;
while (*p) {
if (*p >= '0' && *p <= '9') {
value = (value << 4) | (*p - '0');
} else if (*p >= 'A' && *p <= 'F') {
value = (value << 4) | (*p - 'A' + 10);
} else if (*p >= 'a' && *p <= 'f') {
value = (value << 4) | (*p - 'a' + 10);
} else {
return defval;
}
p++;
}
return value;
}
return atoi(p);
}