Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>

long
atol(char *s)
{
        long n;
        int f, c;

        n = 0;
        f = 0;
        while(*s == ' ' || *s == '\t')
                s++;
        if(*s == '-' || *s == '+') {
                if(*s++ == '-')
                        f = 1;
                while(*s == ' ' || *s == '\t')
                        s++;
        }
        if(s[0]=='0' && s[1]) {
                if(s[1]=='x' || s[1]=='X'){
                        s += 2;
                        for(;;) {
                                c = *s;
                                if(c >= '0' && c <= '9')
                                        n = n*16 + c - '0';
                                else
                                if(c >= 'a' && c <= 'f')
                                        n = n*16 + c - 'a' + 10;
                                else
                                if(c >= 'A' && c <= 'F')
                                        n = n*16 + c - 'A' + 10;
                                else
                                        break;
                                s++;
                        }
                } else
                        while(*s >= '0' && *s <= '7')
                                n = n*8 + *s++ - '0';
        } else
                while(*s >= '0' && *s <= '9')
                        n = n*10 + *s++ - '0';
        if(f)
                n = -n;
        return n;
}

int
atoi(char *s)
{

        return atol(s);
}