rtt-f030/components/libc/minilibc/stdlib.c

42 lines
825 B
C

/*
* File : stdlib.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2008, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2008-08-14 Bernard the first version
*/
#include <rtthread.h>
#if !defined (RT_USING_NEWLIB) && defined (RT_USING_MINILIBC)
#include "stdlib.h"
int errno = 0;
int atoi(const char* s)
{
long int v=0;
int sign=1;
while ( *s == ' ' || (unsigned int)(*s - 9) < 5u) s++;
switch (*s)
{
case '-':
sign=-1;
case '+':
++s;
}
while ((unsigned int) (*s - '0') < 10u)
{
v=v*10+*s-'0';
++s;
}
return sign==-1?-v:v;
}
#endif