mhd_tool_str_to_uint.h

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/*
  This file is part of GNU libmicrohttpd
  Copyright (C) 2023 Evgeny Grin (Karlson2k)
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
 
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifndef MHD_TOOL_STR_TO_UINT_H_
#define MHD_TOOL_STR_TO_UINT_H_ 1
 
#include <stddef.h>
 
static size_t
mhd_tool_str_to_uint (const char *str, unsigned int *value)
{
  size_t i;
  unsigned int v = 0;
  *value = 0;
 
  for (i = 0; 0 != str[i]; ++i)
  {
    const char chr = str[i];
    unsigned int digit;
    if (('0' > chr) || ('9' < chr))
      break;
    digit = (unsigned char) (chr - '0');
    if ((((0U - 1) / 10) < v) || ((v * 10 + digit) < v))
    {
      /* Overflow */
      *value = 0U - 1;
      return 0;
    }
    v *= 10;
    v += digit;
  }
  *value = v;
  return i;
}
 
 
#endif /* MHD_TOOL_STR_TO_UINT_H_ */