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/* fmtulong.c -- Convert unsigned long int to string. */
/* Copyright (C) 1998-2011 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#if defined (HAVE_LIMITS_H)
# include <limits.h>
#endif
#include <bashansi.h>
#ifdef HAVE_STDDEF_H
# include <stddef.h>
#endif
#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif
#ifdef HAVE_INTTYPES_H
# include <inttypes.h>
#endif
#include <chartypes.h>
#include <errno.h>
#include <bashintl.h>
#include "stdc.h"
#include <typemax.h>
#ifndef errno
#include <errno.h>
#endif
#define x_digs "0123456789abcdef"
#define X_digs "0123456789ABCDEF"
/* XXX -- assumes uppercase letters, lowercase letters, and digits are
contiguous */
#define FMTCHAR(x) \
((x) < 10) ? (x) + '0' \
: (((x) < 36) ? (x) - 10 + 'a' \
: (((x) < 62) ? (x) - 36 + 'A' \
: (((x) == 62) ? '@' : '_')))
#ifndef FL_PREFIX
# define FL_PREFIX 0x01 /* add 0x, 0X, or 0 prefix as appropriate */
# define FL_ADDBASE 0x02 /* add base# prefix to converted value */
# define FL_HEXUPPER 0x04 /* use uppercase when converting to hex */
# define FL_UNSIGNED 0x08 /* don't add any sign */
#endif
#ifndef LONG
# define LONG long
# define UNSIGNED_LONG unsigned long
#endif
/* `unsigned long' (or unsigned long long) to string conversion for a given
base. The caller passes the output buffer and the size. This should
check for buffer underflow, but currently does not. */
char *
fmtulong (ui, base, buf, len, flags)
UNSIGNED_LONG ui;
int base;
char *buf;
size_t len;
int flags;
{
char *p;
int sign;
LONG si;
if (base == 0)
base = 10;
if (base < 2 || base > 64)
{
#if 1
/* XXX - truncation possible with long translation */
strncpy (buf, _("invalid base"), len - 1);
buf[len-1] = '\0';
errno = EINVAL;
return (p = buf);
#else
base = 10;
#endif
}
sign = 0;
if ((flags & FL_UNSIGNED) == 0 && (LONG)ui < 0)
{
ui = -ui;
sign = '-';
}
p = buf + len - 2;
p[1] = '\0';
/* handle common cases explicitly */
switch (base)
{
case 10:
if (ui < 10)
{
*p-- = TOCHAR (ui);
break;
}
/* Favor signed arithmetic over unsigned arithmetic; it is faster on
many machines. */
if ((LONG)ui < 0)
{
*p-- = TOCHAR (ui % 10);
si = ui / 10;
}
else
si = ui;
do
*p-- = TOCHAR (si % 10);
while (si /= 10);
break;
case 8:
do
*p-- = TOCHAR (ui & 7);
while (ui >>= 3);
break;
case 16:
do
*p-- = (flags & FL_HEXUPPER) ? X_digs[ui & 15] : x_digs[ui & 15];
while (ui >>= 4);
break;
case 2:
do
*p-- = TOCHAR (ui & 1);
while (ui >>= 1);
break;
default:
do
*p-- = FMTCHAR (ui % base);
while (ui /= base);
break;
}
if ((flags & FL_PREFIX) && (base == 8 || base == 16))
{
if (base == 16)
{
*p-- = (flags & FL_HEXUPPER) ? 'X' : 'x';
*p-- = '0';
}
else if (p[1] != '0')
*p-- = '0';
}
else if ((flags & FL_ADDBASE) && base != 10)
{
*p-- = '#';
*p-- = TOCHAR (base % 10);
if (base > 10)
*p-- = TOCHAR (base / 10);
}
if (sign)
*p-- = '-';
return (p + 1);
}
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