arch/powerpc/boot/stdlib.c

   1 /*
   2  * stdlib functions
   3  *
   4  * Author: Scott Wood <scottwood@freescale.com>
   5  *
   6  * Copyright (c) 2007 Freescale Semiconductor, Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published
  10  * by the Free Software Foundation.
  11  */
  12
  13 #include "stdlib.h"
  14
  15 /* Not currently supported: leading whitespace, sign, 0x prefix, zero base */
  16 unsigned long long int strtoull(const char *ptr, char **end, int base)
  17 {
  18         unsigned long long ret = 0;
  19
  20         if (base > 36)
  21                 goto out;
  22
  23         while (*ptr) {
  24                 int digit;
  25
  26                 if (*ptr >= '0' && *ptr <= '9' && *ptr < '0' + base)
  27                         digit = *ptr - '0';
  28                 else if (*ptr >= 'A' && *ptr < 'A' + base - 10)
  29                         digit = *ptr - 'A' + 10;
  30                 else if (*ptr >= 'a' && *ptr < 'a' + base - 10)
  31                         digit = *ptr - 'a' + 10;
  32                 else
  33                         break;
  34
  35                 ret *= base;
  36                 ret += digit;
  37                 ptr++;
  38         }
  39
  40 out:
  41         if (end)
  42                 *end = (char *)ptr;
  43
  44         return ret;
  45 }