diff options
Diffstat (limited to 'main')
-rw-r--r-- | main/conversions.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/main/conversions.c b/main/conversions.c new file mode 100644 index 000000000..e73e1a213 --- /dev/null +++ b/main/conversions.c @@ -0,0 +1,77 @@ +/* + * 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; + +} |