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