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/* Check that the ftruncate syscall works trivially.
#progos: linux
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void
perr (const char *s)
{
perror (s);
exit (1);
}
int
main (void)
{
FILE *f;
const char fname[] = "sk1test.dat";
const char tsttxt1[]
= "This is the first and only line of this file.\n";
const char tsttxt2[] = "Now there is a second line.\n";
char buf[sizeof (tsttxt1) + sizeof (tsttxt2) - 1] = "";
f = fopen (fname, "w+");
if (f == NULL
|| fwrite (tsttxt1, 1, strlen (tsttxt1), f) != strlen (tsttxt1))
perr ("open or fwrite");
if (fflush (f) != 0)
perr ("fflush");
if (ftruncate (fileno (f), strlen(tsttxt1) - 20) != 0)
perr ("ftruncate");
if (fclose (f) != 0)
perr ("fclose");
f = fopen (fname, "r");
if (f == NULL
|| fread (buf, 1, sizeof (buf), f) != strlen (tsttxt1) - 20
|| strncmp (buf, tsttxt1, strlen (tsttxt1) - 20) != 0
|| fclose (f) != 0)
{
printf ("fail\n");
exit (1);
}
printf ("pass\n");
exit (0);
}
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