libjaylink/strutil.c

   1 /*
   2  * This file is part of the libjaylink project.
   3  *
   4  * Copyright (C) 2016 Marc Schink <jaylink-dev@marcschink.de>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <stdlib.h>
  21 #include <stdint.h>
  22 #include <errno.h>
  23
  24 #include "libjaylink.h"
  25
  26 /**
  27  * @file
  28  *
  29  * String utility functions.
  30  */
  31
  32 /**
  33  * Convert a string representation of a serial number to an integer.
  34  *
  35  * The string representation of the serial number must be in decimal form.
  36  *
  37  * @param[in] str String representation to convert.
  38  * @param[out] serial_number Serial number on success, and undefined on
  39  *                           failure.
  40  *
  41  * @retval JAYLINK_OK Success.
  42  * @retval JAYLINK_ERR_ARG Invalid arguments.
  43  * @retval JAYLINK_ERR Conversion error. Serial number is invalid or string
  44  *                     representation contains invalid character(s).
  45  *
  46  * @since 0.1.0
  47  */
  48 JAYLINK_API int jaylink_parse_serial_number(const char *str,
  49                 uint32_t *serial_number)
  50 {
  51         char *end_ptr;
  52         unsigned long long tmp;
  53
  54         if (!str || !serial_number)
  55                 return JAYLINK_ERR_ARG;
  56
  57         errno = 0;
  58         tmp = strtoull(str, &end_ptr, 10);
  59
  60         if (*end_ptr != '\0' || errno != 0 || tmp > UINT32_MAX)
  61                 return JAYLINK_ERR;
  62
  63         *serial_number = tmp;
  64
  65         return JAYLINK_OK;
  66 }