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-rw-r--r--stdio-common/bug12.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/stdio-common/bug12.c b/stdio-common/bug12.c
new file mode 100644
index 0000000..48610c0
--- /dev/null
+++ b/stdio-common/bug12.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <string.h>
+
+char x[4096], z[4096], b[21], m[4096 * 4];
+
+int
+main (void)
+{
+ FILE *f = tmpfile ();
+ int i, failed = 0;
+
+ memset (x, 'x', 4096);
+ memset (z, 'z', 4096);
+ b[20] = 0;
+
+ for (i = 0; i <= 5; i++)
+ {
+ fwrite (x, 4096, 1, f);
+ fwrite (z, 4096, 1, f);
+ }
+ rewind (f);
+
+ fread (m, 4096 * 4 - 10, 1, f);
+ fread (b, 20, 1, f);
+ printf ("got %s (should be %s)\n", b, "zzzzzzzzzzxxxxxxxxxx");
+ if (strcmp (b, "zzzzzzzzzzxxxxxxxxxx"))
+ failed = 1;
+
+ fseek (f, -40, SEEK_CUR);
+ fread (b, 20, 1, f);
+ printf ("got %s (should be %s)\n", b, "zzzzzzzzzzzzzzzzzzzz");
+ if (strcmp (b, "zzzzzzzzzzzzzzzzzzzz"))
+ failed = 1;
+
+ fread (b, 20, 1, f);
+ printf ("got %s (should be %s)\n", b, "zzzzzzzzzzxxxxxxxxxx");
+ if (strcmp (b, "zzzzzzzzzzxxxxxxxxxx"))
+ failed = 1;
+
+ fread (b, 20, 1, f);
+ printf ("got %s (should be %s)\n", b, "xxxxxxxxxxxxxxxxxxxx");
+ if (strcmp (b, "xxxxxxxxxxxxxxxxxxxx"))
+ failed = 1;
+
+ return failed;
+}