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-rw-r--r--stdio-common/test-fseek.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/stdio-common/test-fseek.c b/stdio-common/test-fseek.c
new file mode 100644
index 0000000000..d56c669a54
--- /dev/null
+++ b/stdio-common/test-fseek.c
@@ -0,0 +1,67 @@
+#include <ansidecl.h>
+#include <stdio.h>
+
+#define TESTFILE "/tmp/test.dat"
+
+int
+main __P((void))
+{
+ FILE *fp;
+ int i, j;
+
+ puts ("\nFile seek test");
+ fp = fopen (TESTFILE, "w");
+ if (fp == NULL)
+ {
+ perror (TESTFILE);
+ return 1;
+ }
+
+ for (i = 0; i < 256; i++)
+ putc (i, fp);
+ if (freopen (TESTFILE, "r", fp) != fp)
+ {
+ perror ("Cannot open file for reading");
+ return 1;
+ }
+
+ for (i = 1; i <= 255; i++)
+ {
+ printf ("%3d\n", i);
+ fseek (fp, (long) -i, SEEK_END);
+ if ((j = getc (fp)) != 256 - i)
+ {
+ printf ("SEEK_END failed %d\n", j);
+ break;
+ }
+ if (fseek (fp, (long) i, SEEK_SET))
+ {
+ puts ("Cannot SEEK_SET");
+ break;
+ }
+ if ((j = getc (fp)) != i)
+ {
+ printf ("SEEK_SET failed %d\n", j);
+ break;
+ }
+ if (fseek (fp, (long) i, SEEK_SET))
+ {
+ puts ("Cannot SEEK_SET");
+ break;
+ }
+ if (fseek (fp, (long) (i >= 128 ? -128 : 128), SEEK_CUR))
+ {
+ puts ("Cannot SEEK_CUR");
+ break;
+ }
+ if ((j = getc (fp)) != (i >= 128 ? i - 128 : i + 128))
+ {
+ printf ("SEEK_CUR failed %d\n", j);
+ break;
+ }
+ }
+ fclose (fp);
+
+ puts ((i > 255) ? "Test succeeded." : "Test FAILED!");
+ return (i > 255) ? 0 : 1;
+}