2.5-18.1

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;
+}