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/**
* @file test_preload.c
* @brief Smoke test — call malloc once and print the returned pointer.
*
* Uses write(2) instead of printf to avoid stdio calling malloc
* internally, which would pollute output under LD_PRELOAD.
*/
#include <stdlib.h>
#include <unistd.h>
/** @brief Write the hex representation of @p ptr to stdout. */
static void
_s_put_ptr (void *ptr)
{
static const char hex[] = "0123456789abcdef";
char buf[20];
unsigned long v = (unsigned long)ptr;
size_t i;
if (!ptr)
{
write (1, "(nil)", 5);
return;
}
i = sizeof (buf);
while (v)
{
buf[--i] = hex[v % 16];
v /= 16;
}
buf[--i] = 'x';
buf[--i] = '0';
write (1, buf + i, sizeof (buf) - i);
}
int
main (void)
{
void *p = malloc (42);
write (1, "malloc(42) = ", 13);
_s_put_ptr (p);
write (1, "\n", 1);
free (p);
return (0);
}
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