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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2017, Digium, Inc.
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief Conversion utility functions
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include "asterisk/conversions.h"
static int str_is_negative(const char *str)
{
/* Ignore any preceding white space */
while (isspace(*str) && *++str);
return *str == '-';
}
int ast_str_to_uint(const char *str, unsigned int *res)
{
unsigned long val;
if (ast_str_to_ulong(str, &val) || val > UINT_MAX) {
return -1;
}
*res = val;
return 0;
}
int ast_str_to_ulong(const char *str, unsigned long *res)
{
char *end;
unsigned long val;
if (!str || str_is_negative(str)) {
return -1;
}
errno = 0;
val = strtoul(str, &end, 0);
/*
* If str equals end then no digits were found. If end is not pointing to
* a null character then the string contained some numbers that could be
* converted, but some characters that could not, which we'll consider
* invalid.
*/
if ((str == end || *end != '\0' || (errno == ERANGE && val == ULONG_MAX))) {
return -1;
}
*res = val;
return 0;
}
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