106 lines
1.7 KiB
C
106 lines
1.7 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#define MEGABYTE 1048576
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#define KILOBYTE 1024
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/* How to call:
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./tst-write-ftell DESTFILE SIZE_KB 0|1
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0 => do not call ftell;
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1 => call ftell;
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SIZE_KB must be in range [10,200]. */
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int
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main (int argc, char *argv[])
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{
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int ret;
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char *filename;
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char *data;
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int dsize, writesize, chunksize, count;
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FILE *file;
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int ftell_on = 0;
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chunksize = 208;
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if (argc < 3)
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{
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fprintf (stderr, "Invalid arguments\n");
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exit (1);
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}
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filename = argv[1];
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errno = 0;
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dsize = strtol (argv[2], NULL, 0);
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if (errno)
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{
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perror ("strtol() failed");
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return 1;
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}
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if ((dsize < 10)
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|| (dsize > 200))
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{
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fprintf (stderr, "Invalid SIZE_KB: %d\n", dsize);
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exit (1);
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}
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dsize *= KILOBYTE;
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ftell_on = strtol (argv[3], NULL, 0);
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if (errno)
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{
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perror ("strtol() failed");
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exit (1);
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}
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data = malloc (sizeof (char) * dsize);
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if (!data)
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{
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perror ("malloc() failed");
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exit (1);
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}
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file = fopen (filename, "w");
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if (file == NULL)
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{
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perror ("fopen failed()");
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exit (1);
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}
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for (count = 0; count < dsize; count += chunksize)
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{
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if (count + chunksize <= dsize)
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{
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writesize = chunksize;
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}
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else
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{
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writesize = dsize - count;
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}
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ret = fwrite (data, writesize, 1, file);
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if (ret != 1)
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{
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perror ("Write failed");
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abort ();
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}
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if (ftell_on)
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{
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int pos;
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pos = ftell (file);
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if (pos < 0)
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{
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perror ("ftell() failed");
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abort ();
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}
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}
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}
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ret = fclose (file);
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}
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