_itoa.c

来自「一个C源代码分析器」· C语言 代码 · 共 46 行

/* Internal function for converting integers to ASCII.
Copyright (C) 1994 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <ansidecl.h>
#include "_itoa.h"

/* Lower-case digits.  */
CONST char _itoa_lower_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
/* Upper-case digits.  */
CONST char _itoa_upper_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

char *
DEFUN(_itoa, (value, buflim, base, upper_case),
      unsigned long long int value AND char *buflim AND
      unsigned int base AND int upper_case)
{
  /* Base-36 digits for numbers.  */
  CONST char *digits = upper_case ? _itoa_upper_digits : _itoa_lower_digits;

  register char *bp = buflim;

  while (value > 0)
    {
      *--bp = digits[value % base];
      value /= base;
    }

  return bp;
}