Goto sanos source index
//
// xtoa.c
//
// Convert integers to ASCII strings
//
// Copyright (C) 2002 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the project nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
static void xtoa(unsigned long val, char *buf, unsigned radix, int negative) {
char *p;
char *firstdig;
char temp;
unsigned digval;
p = buf;
if (negative) {
// Negative, so output '-' and negate
*p++ = '-';
val = (unsigned long)(-(long) val);
}
// Save pointer to first digit
firstdig = p;
do {
digval = (unsigned) (val % radix);
val /= radix;
// Convert to ascii and store
if (digval > 9) {
*p++ = (char) (digval - 10 + 'a');
} else {
*p++ = (char) (digval + '0');
}
} while (val > 0);
// We now have the digit of the number in the buffer, but in reverse
// order. Thus we reverse them now.
*p-- = '\0';
do {
temp = *p;
*p = *firstdig;
*firstdig = temp;
p--;
firstdig++;
} while (firstdig < p);
}
char *itoa(int val, char *buf, int radix) {
if (radix == 10 && val < 0) {
xtoa((unsigned long) val, buf, radix, 1);
} else {
xtoa((unsigned long)(unsigned int) val, buf, radix, 0);
}
return buf;
}
char *ltoa(long val, char *buf, int radix) {
xtoa((unsigned long) val, buf, radix, (radix == 10 && val < 0));
return buf;
}
char *ultoa(unsigned long val, char *buf, int radix) {
xtoa(val, buf, radix, 0);
return buf;
}