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