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/*
* UCW Library -- Memory Pools (Formatting)
*
* (c) 2005 Martin Mares <mj@ucw.cz>
* (c) 2007 Pavel Charvat <pchar@ucw.cz>
* SPDX-License-Identifier: LGPL-2.1-or-later
* Source: https://www.ucw.cz/libucw/
*/
#include <ucw/lib.h>
#include <ucw/mempool.h>
#include <stdio.h>
#include <string.h>
/* FIXME: migrate to Knot DNS version of mempools. */
#pragma GCC diagnostic ignored "-Wpointer-arith"
static char *
mp_vprintf_at(struct mempool *mp, size_t ofs, const char *fmt, va_list args)
{
char *ret = mp_grow(mp, ofs + 1) + ofs;
va_list args2;
va_copy(args2, args);
int cnt = vsnprintf(ret, mp_avail(mp) - ofs, fmt, args2);
va_end(args2);
if (cnt < 0)
{
/* Our C library doesn't support C99 return value of vsnprintf, so we need to iterate */
do
{
ret = mp_expand(mp) + ofs;
va_copy(args2, args);
cnt = vsnprintf(ret, mp_avail(mp) - ofs, fmt, args2);
va_end(args2);
}
while (cnt < 0);
}
else if ((uint)cnt >= mp_avail(mp) - ofs)
{
ret = mp_grow(mp, ofs + cnt + 1) + ofs;
va_copy(args2, args);
vsnprintf(ret, cnt + 1, fmt, args2);
va_end(args2);
}
mp_end(mp, ret + cnt + 1);
return ret - ofs;
}
char *
mp_vprintf(struct mempool *mp, const char *fmt, va_list args)
{
mp_start(mp, 1);
return mp_vprintf_at(mp, 0, fmt, args);
}
char *
mp_printf(struct mempool *p, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
char *res = mp_vprintf(p, fmt, args);
va_end(args);
return res;
}
char *
mp_vprintf_append(struct mempool *mp, char *ptr, const char *fmt, va_list args)
{
size_t ofs = mp_open(mp, ptr);
ASSERT(ofs && !ptr[ofs - 1]);
return mp_vprintf_at(mp, ofs - 1, fmt, args);
}
char *
mp_printf_append(struct mempool *mp, char *ptr, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
char *res = mp_vprintf_append(mp, ptr, fmt, args);
va_end(args);
return res;
}
#ifdef TEST
int main(void)
{
struct mempool *mp = mp_new(64);
char *x = mp_printf(mp, "<Hello, %s!>", "World");
fputs(x, stdout);
x = mp_printf_append(mp, x, "<Appended>");
fputs(x, stdout);
x = mp_printf(mp, "<Hello, %50s!>\n", "World");
fputs(x, stdout);
return 0;
}
#endif
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