glibc/stdio-common/tst-obprintf.c

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#include <mcheck.h>
#include <obstack.h>
#include <stdio.h>
#include <stdlib.h>
int
main (void)
{
struct obstack ob;
int n;
mcheck_pedantic (NULL);
#define obstack_chunk_alloc malloc
#define obstack_chunk_free free
obstack_init (&ob);
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for (n = 0; n < 40000; ++n)
{
mcheck_check_all ();
obstack_printf (&ob, "%.*s%05d", 1 + n % 7, "foobarbaz", n);
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if (n % 777 == 0)
obstack_finish (&ob);
}
/* Another loop where we finish all objects, each of size 1. This will
manage to call `obstack_print' with all possible positions inside
an obstack chunk. */
for (n = 0; n < 40000; ++n)
{
mcheck_check_all ();
obstack_printf (&ob, "%c", 'a' + n % 26);
obstack_finish (&ob);
}
/* And a final check. */
mcheck_check_all ();
return 0;
}