71 lines
1.2 KiB
C
71 lines
1.2 KiB
C
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/* Derived from the test case in
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https://sourceware.org/bugzilla/show_bug.cgi?id=1078. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#define OUT_SIZE 10000
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static int fd;
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static void prepare (void);
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#define PREPARE(argc, argv) prepare ()
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static int do_test (void);
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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static void
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prepare (void)
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{
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fd = create_temp_file ("tst-fwrite.", NULL);
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if (fd == -1)
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{
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puts ("cannot create temporary file");
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exit (1);
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}
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}
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static int
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do_test (void)
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{
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FILE* f = fdopen (fd, "w+");
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if (f == NULL) {
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puts ("cannot create stream");
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return 1;
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}
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puts ("Opened temp file");
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if (fwrite ("a", 1, 1, f) != 1)
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{
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puts ("1st fwrite failed");
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return 1;
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}
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puts ("Wrote a byte");
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fflush (f);
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char buffer[10000];
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size_t i = fread (buffer, 1, sizeof (buffer), f);
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printf ("Read %zu bytes\n", i);
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for (i = 0; i < OUT_SIZE; i++)
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{
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if (fwrite ("n", 1, 1, f) != 1)
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{
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printf ("fwrite in loop round %zu failed\n", i);
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return 1;
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}
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if ((i + 1) % 1000 == 0)
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printf ("wrote %zu bytes ...\n", i + 1);
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}
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printf ("Wrote %i bytes [done]\n", OUT_SIZE);
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return 0;
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}
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