1 line
2.4 KiB
Plaintext
1 line
2.4 KiB
Plaintext
|
/* Conformance Test 17.5.0.1: Verification of fseek function */
#include <stdio.h>
main ()
{
FILE *f1; /* file pointer */
int i, j, k, m;
f1 = fopen ("3/tmp", "w+b"); /* create binary file to work on */
if (f1 == NULL)
goto Fail1;
for (i = 0; i < 100; i++) /* write 100 integers to the file */
{
j = fprintf (f1, "%2d ", i);
if (j == EOF)
goto Fail2;
}
i = fseek (f1, 50, SEEK_END); /* extend file by extra 50 bytes */
if (i)
goto Fail;
rewind (f1); /* position at beginning of file */
i = 0;
while ((j = fgetc (f1)) != EOF)
i += 1;
if (! (j = feof (f1)) )
goto Fail3;
if (i != 450) /* check size of file in bytes */
goto Fail;
/* Test seek from beginning of file. */
for (k = 0, i = 0; i < 100; i++)
{
j = fseek (f1, k, SEEK_SET);
if (j)
goto Fail;
j = fscanf (f1, "%d", &m);
if (j == EOF)
goto Fail3;
if (m != i)
goto Fail;
k += 4;
}
/* Test seek from end of file. */
j = fseek (f1, -54, SEEK_END); /* start 54 bytes from end of file */
if (j)
goto Fail;
for (k = -54, i = 99; i > 0; i--)
{
j = fscanf (f1, "%d", &m);
if (j == EOF)
goto Fail3;
if (m != i)
goto Fail;
k -= 4;
j = fseek (f1, k, SEEK_END);
if (j)
goto Fail;
}
/* Test seek from current position in file. */
j = fseek (f1, 12, SEEK_CUR);
if (j)
goto Fail;
j = fscanf (f1, "%d", &m);
if (j == EOF)
goto Fail3;
if (m != 3)
goto Fail;
j = fseek (f1, 12, SEEK_CUR);
if (j)
goto Fail;
j = fscanf (f1, "%d", &m);
if (j == EOF)
goto Fail3;
if (m != 7)
goto Fail;
/* Close the file and quit. */
j = fclose (f1);
if (j == EOF)
goto Fail4;
printf ("Passed Conformance Test 17.5.0.1\n");
return;
Fail:
printf ("Failed Conformance Test 17.5.0.1\n");
return;
Fail1:
printf ("Could not open tmp file for Conformance Test 17.5.0.1\n");
return;
Fail2:
printf ("Could not write to file for Conformance Test 17.5.0.1\n");
return;
Fail3:
printf ("Error while reading file for Conformance Test 17.5.0.1\n");
return;
Fail4:
printf ("Could not close file for Conformance Test 17.5.0.1\n");
return;
}
|