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/* Project:     OSLib
 * Description: The OS Construction Kit
 * Date:                1.6.2000
 * Idea by:             Luca Abeni & Gerardo Lamastra
 *
 * OSLib is an SO project aimed at developing a common, easy-to-use
 * low-level infrastructure for developing OS kernels and Embedded
 * Applications; it partially derives from the HARTIK project but it
 * currently is independently developed.
 *
 * OSLib is distributed under GPL License, and some of its code has
 * been derived from the Linux kernel source; also some important
 * ideas come from studying the DJGPP go32 extender.
 *
 * We acknowledge the Linux Community, Free Software Foundation,
 * D.J. Delorie and all the other developers who believe in the
 * freedom of software and ideas.
 *
 * For legalese, check out the included GPL license.
 */

#include <arch/i386/stdlib.h>
#include <arch/i386/string.h>
#include <arch/i386/limits.h>
#include <arch/stdarg.h>
#include <arch/ctype.h>

FILE(strtou);

long unsigned strtou(char *s,int base,char **scan_end)
{
    int value,overflow = 0;
    long unsigned result = 0,oldresult;
    /* Skip trailing zeros */
    while (*s == '0') s++;
    if (*s == 'x' && base == 16) {
        s++;
        while (*s == '0') s++;
    }
    /* Convert number */
    while (isnumber(*s,base)) {
        value = tonumber(*s++);
        if (value > base || value < 0) return(0);
        oldresult = result;
        result *= base;
        result += value;
        /* Detect overflow */
        if (oldresult > result) overflow = 1;
    }
    if (scan_end != 0L) *scan_end = s;
    if (overflow) result = INT_MAX;
    return(result);
}