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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
*/
/**
* @file tools/mhd_tool_str_to_uint.c
* @brief Implementation of HTTP server optimised for fast replies
* based on MHD.
* @author Karlson2k (Evgeny Grin)
*/
#ifndef MHD_TOOL_STR_TO_UINT_H_
#define MHD_TOOL_STR_TO_UINT_H_
#include <stddef.h>
/**
* Convert decimal string to unsigned int.
* Function stops at the end of the string or on first non-digit character.
* @param str the string to convert
* @param[out] value the pointer to put the result
* @return return the number of digits converted or
* zero if no digits found or result would overflow the output
* variable (the output set to UINT_MAX in this case).
*/
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_ */
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