| 1 | /* Test of ftell function. */
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| 2 |
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| 3 | #include <stdio.h>
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| 4 | #include <stdlib.h>
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| 5 |
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| 6 | #define ASSERT(expr) \
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| 7 | do \
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| 8 | { \
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| 9 | if (!(expr)) \
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| 10 | { \
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| 11 | fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
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| 12 | fflush (stderr); \
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| 13 | abort (); \
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| 14 | } \
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| 15 | } \
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| 16 | while (0)
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| 17 |
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| 18 | int
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| 19 | main ()
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| 20 | {
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| 21 | int ch;
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| 22 |
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| 23 | /* Simple tests. */
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| 24 | ASSERT (ftell (stdin) == 0);
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| 25 |
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| 26 | ch = fgetc (stdin);
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| 27 | ASSERT (ch == '/');
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| 28 | ASSERT (ftell (stdin) == 1);
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| 29 |
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| 30 | /* Test ftell after ungetc of read input. */
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| 31 | ch = ungetc ('/', stdin);
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| 32 | ASSERT (ch == '/');
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| 33 | ASSERT (ftell (stdin) == 0);
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| 34 |
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| 35 | ch = fgetc (stdin);
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| 36 | ASSERT (ch == '/');
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| 37 | ASSERT (ftell (stdin) == 1);
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| 38 |
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| 39 | /* Test ftell after fseek. */
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| 40 | ASSERT (fseek (stdin, 2, SEEK_SET) == 0);
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| 41 | ASSERT (ftell (stdin) == 2);
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| 42 |
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| 43 | /* Test ftell after random ungetc. */
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| 44 | ch = fgetc (stdin);
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| 45 | ASSERT (ch == ' ');
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| 46 | ch = ungetc ('@', stdin);
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| 47 | ASSERT (ch == '@');
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| 48 | ASSERT (ftell (stdin) == 2);
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| 49 |
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| 50 | ch = fgetc (stdin);
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| 51 | ASSERT (ch == '@');
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| 52 | ASSERT (ftell (stdin) == 3);
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| 53 |
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| 54 | /* Test ftell after ungetc without read. */
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| 55 | ASSERT (fseek (stdin, 0, SEEK_CUR) == 0);
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| 56 | ASSERT (ftell (stdin) == 3);
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| 57 |
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| 58 | return 0;
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| 59 | }
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