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/* fmt/ullnum.c - Format an unsigned long long number.
* 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 <string.h>
#include "fmt.h"
static unsigned rec(char* buffer, unsigned long long num,
unsigned width, char pad,
unsigned base, const char* digits)
{
char* s = buffer;
if (width) --width;
if (num >= base)
s += rec(s, num/base, width, pad, base, digits);
else {
memset(s, pad, width);
s += width;
}
*s++ = digits[num % base];
return s - buffer;
}
/** Format an unsigned long long integer of arbitrary base with optional
padding. */
unsigned fmt_ullnumw(char* buffer, unsigned long long num,
unsigned width, char pad,
unsigned base, const char* digits)
{
char* s = buffer;
if (buffer == 0) {
unsigned len;
for (len = 1; num >= base; ++len)
num /= base;
return (width > len) ? width : len;
}
if (num < base) {
if (width) {
--width;
memset(buffer, pad, width);
s = buffer + width;
}
*s++ = digits[num];
}
else
s = buffer + rec(buffer, num, width, pad, base, digits);
return s - buffer;
}
#ifdef SELFTEST_MAIN
static void test(unsigned (*fn)(char*, unsigned long long, unsigned, char),
unsigned long long num, unsigned width, char pad)
{
char buf[FMT_ULONG_LEN];
obuf_putu(&outbuf, fn(0, num, width, pad));
obuf_putc(&outbuf, ':');
buf[fn(buf, num, width, pad)] = 0;
obuf_puts(&outbuf, buf);
NL();
}
MAIN
{
test(fmt_ulldecw, 0, 0, 0);
test(fmt_ulldecw, 10, 0, 0);
test(fmt_ulldecw, 10, 1, ' ');
test(fmt_ulldecw, 10, 5, ' ');
test(fmt_ulldecw, 10, 5, '0');
test(fmt_ullhexw, 30, 0, 0);
test(fmt_ullhexw, 30, 5, ' ');
test(fmt_ullhexw, 30, 5, '0');
test(fmt_ullHexw, 30, 0, 0);
test(fmt_ullHexw, 30, 5, ' ');
test(fmt_ullHexw, 30, 5, '0');
}
#endif
#ifdef SELFTEST_EXP
1:0
2:10
2:10
5: 10
5:00010
2:1e
5: 1e
5:0001e
2:1E
5: 1E
5:0001E
#endif
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