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/* fmt/snum.c - Format a signed integer.
* Copyright (C) 2004,2005 Bruce Guenter <bruce@untroubled.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "fmt.h"
static unsigned rec(char* buffer, long num, int sign,
unsigned width, char pad,
unsigned base, const char* digits)
{
char* s = buffer;
if (width) --width;
if (num >= (long)base)
s += rec(s, num/base, sign, width, pad, base, digits);
else
s += fmt_sign_pad(s, sign, width, pad);
*s++ = digits[num % base];
return s - buffer;
}
/** Format a signed integer of arbitrary base with optional padding. */
unsigned fmt_snumw(char* buffer, long num, unsigned width, char pad,
unsigned base, const char* digits)
{
char* s = buffer;
int sign;
sign = 0;
if (num < 0) {
sign = 1;
num = -num;
if (width) -- width;
}
if (buffer == 0) {
unsigned len;
for (len = 1; num >= (long)base; ++len)
num /= base;
return ((width > len) ? width : len) + sign;
}
if (num < (long)base) {
if (width) --width;
s += fmt_sign_pad(s, sign, width, pad);
*s++ = digits[num];
}
else
s += rec(s, num, sign, width, pad, base, digits);
return s - buffer;
}
#ifdef SELFTEST_MAIN
void test(long num, unsigned width, char pad)
{
char buf[FMT_ULONG_LEN];
obuf_putu(&outbuf, fmt_sdecw(0, num, width, pad));
obuf_putc(&outbuf, ':');
buf[fmt_sdecw(buf, num, width, pad)] = 0;
obuf_puts(&outbuf, buf);
NL();
}
void testall(long num)
{
test(num, 0, 0);
test(num, 1, '0');
test(num, 5, ' ');
test(num, 5, '0');
}
MAIN
{
testall(0);
testall(1);
testall(-1);
testall(10);
testall(-10);
}
#endif
#ifdef SELFTEST_EXP
1:0
1:0
5: 0
5:00000
1:1
1:1
5: 1
5:00001
2:-1
2:-1
5: -1
5:-0001
2:10
2:10
5: 10
5:00010
3:-10
3:-10
5: -10
5:-0010
#endif
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