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/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <ctype.h>
/**
* Convert a string to an integer,
* without checking for errors.
*
* The string may being with an arbitrary number
* of whitespace characters. Convertion will end
* when a character is encountered that is not a
* decimal digit, and is not an absolutely leading
* '-' or '+'.
*
* @param string The string to convert.
* @return The integer encoded by the string.
*/
long int atol(const char* string)
{
long int rc = 0;
int neg = 0;
while (isspace(*string))
string++;
switch (*string)
{
case '-': neg = 1;
case '+': string++;
default: break;
}
while (isdigit(*string))
rc = rc * 10 - (*string++ & 15);
return neg ? rc : -rc;
}
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