source: trunk/kernel/libk/atoi.c @ 436

Last change on this file since 436 was 1, checked in by alain, 5 years ago

First import

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1/*
2 * atoi.c - convert a string to an integer
3 *
4 * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
5 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
6 *
7 * This file is part of ALMOS-kernel.
8 *
9 * ALMOS-kernel is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2.0 of the License.
12 *
13 * ALMOS-kernel is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with ALMOS-kernel; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include <string.h>
24#include <types.h>
25#include <ctype.h>
26
27int atoi(const char *nptr)
28{
29        sint_t num;
30        sint_t signe;
31 
32        while(isspace(*nptr));
33 
34        signe = (*(nptr) == '-') ? -1 : +1;
35        num = 0;
36
37        while(*(nptr))
38        {   
39                if((*nptr >= '0') && (*nptr <= '9'))
40                        num = (num * 10) + (*nptr - '0');
41   
42                nptr ++;
43        }
44   
45        return num * signe;
46}
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