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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* 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 Hyra 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.
*/
#include <string.h>
#include <stdarg.h>
#include <sys/types.h>
static inline void
printc(char *buf, size_t size, size_t *off, char c)
{
if (*off < size - 1) {
buf[(*off)++] = c;
}
buf[*off] = 0;
}
static void
printstr(char *buf, size_t size, size_t *off, const char *s)
{
while (*off < size - 1 && *s != '\0') {
buf[(*off)++] = *(s)++;
}
buf[*off] = 0;
}
int
snprintf(char *s, size_t size, const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = vsnprintf(s, size, fmt, ap);
va_end(ap);
return ret;
}
int
vsnprintf(char *s, size_t size, const char *fmt, va_list ap)
{
size_t tmp_len, off = 0;
ssize_t num = 0;
char c, c1, num_buf[256] = {0};
const char *tmp_str;
while (off < (size - 1)) {
while (*fmt && *fmt != '%') {
printc(s, size, &off, *fmt++);
}
if (*(fmt)++ == '\0' || off == size - 1) {
return off;
}
c = *fmt++;
switch (c) {
case 'c':
c1 = (char )va_arg(ap, int);
printc(s, size, &off, c1);
break;
case 'd':
num = va_arg(ap, int);
itoa(num, num_buf, 10);
printstr(s, size, &off, num_buf);
break;
case 'p':
num = va_arg(ap, uint64_t);
itoa(num, num_buf, 16);
tmp_len = strlen(num_buf);
/*
* Now we pad this.
*
* XXX TODO: This assumes 64-bits, should be
* cleaned up.
*/
for (size_t i = 0; i < 18 - tmp_len; ++i) {
printc(s, size, &off, '0');
}
printstr(s, size, &off, num_buf + 2);
break;
case 'x':
num = va_arg(ap, uint64_t);
itoa(num, num_buf, 16);
tmp_len = strlen(num_buf);
printstr(s, size, &off, num_buf + 2);
break;
case 's':
tmp_str = va_arg(ap, const char *);
printstr(s, size, &off, tmp_str);
break;
}
}
return 0;
}
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