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-rw-r--r--stdio-common/tst-fwrite.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/stdio-common/tst-fwrite.c b/stdio-common/tst-fwrite.c
new file mode 100644
index 0000000000..2986c8932a
--- /dev/null
+++ b/stdio-common/tst-fwrite.c
@@ -0,0 +1,70 @@
+/* Derived from the test case in
+ http://sourceware.org/bugzilla/show_bug.cgi?id=1078. */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define OUT_SIZE 10000
+
+
+static int fd;
+
+static void prepare (void);
+#define PREPARE(argc, argv) prepare ()
+
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+
+#include "../test-skeleton.c"
+
+
+static void
+prepare (void)
+{
+ fd = create_temp_file ("tst-fwrite.", NULL);
+ if (fd == -1)
+ {
+ puts ("cannot create temporary file");
+ exit (1);
+ }
+}
+
+
+static int
+do_test (void)
+{
+ FILE* f = fdopen (fd, "w+");
+ if (f == NULL) {
+ puts ("cannot create stream");
+ return 1;
+ }
+ puts ("Opened temp file");
+
+ if (fwrite ("a", 1, 1, f) != 1)
+ {
+ puts ("1st fwrite failed");
+ return 1;
+ }
+ puts ("Wrote a byte");
+ fflush (f);
+
+ char buffer[10000];
+ size_t i = fread (buffer, 1, sizeof (buffer), f);
+ printf ("Read %zu bytes\n", i);
+
+ for (i = 0; i < OUT_SIZE; i++)
+ {
+ if (fwrite ("n", 1, 1, f) != 1)
+ {
+ printf ("fwrite in loop round %zu failed\n", i);
+ return 1;
+ }
+
+ if ((i + 1) % 1000 == 0)
+ printf ("wrote %zu bytes ...\n", i + 1);
+ }
+
+ printf ("Wrote %i bytes [done]\n", OUT_SIZE);
+
+ return 0;
+}