arch/powerpc/boot/stdlib.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * stdlib functions
   4  *
   5  * Author: Scott Wood <scottwood@freescale.com>
   6  *
   7  * Copyright (c) 2007 Freescale Semiconductor, Inc.
   8  */
   9
  10 #include "stdlib.h"
  11
  12 /* Not currently supported: leading whitespace, sign, 0x prefix, zero base */
  13 unsigned long long int strtoull(const char *ptr, char **end, int base)
  14 {
  15         unsigned long long ret = 0;
  16
  17         if (base > 36)
  18                 goto out;
  19
  20         while (*ptr) {
  21                 int digit;
  22
  23                 if (*ptr >= '0' && *ptr <= '9' && *ptr < '0' + base)
  24                         digit = *ptr - '0';
  25                 else if (*ptr >= 'A' && *ptr < 'A' + base - 10)
  26                         digit = *ptr - 'A' + 10;
  27                 else if (*ptr >= 'a' && *ptr < 'a' + base - 10)
  28                         digit = *ptr - 'a' + 10;
  29                 else
  30                         break;
  31
  32                 ret *= base;
  33                 ret += digit;
  34                 ptr++;
  35         }
  36
  37 out:
  38         if (end)
  39                 *end = (char *)ptr;
  40
  41         return ret;
  42 }