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-rw-r--r--stdio-common/tst-rndseek.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/stdio-common/tst-rndseek.c b/stdio-common/tst-rndseek.c
new file mode 100644
index 0000000000..82a4cfd83e
--- /dev/null
+++ b/stdio-common/tst-rndseek.c
@@ -0,0 +1,143 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+
+static char fname[] = "/tmp/rndseek.XXXXXX";
+static char tempdata[65 * 1024];
+
+
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+
+#include "../test-skeleton.c"
+
+
+static int
+fp_test (FILE *fp)
+{
+ int result = 0;
+ int rounds = 10000;
+
+ do
+ {
+ int idx = random () % (sizeof (tempdata) - 2);
+ char ch1;
+ char ch2;
+
+ if (fseek (fp, idx, SEEK_SET) != 0)
+ {
+ printf ("%d: fseek failed: %m\n", rounds);
+ result = 1;
+ break;
+ }
+
+ ch1 = fgetc_unlocked (fp);
+ ch2 = tempdata[idx];
+ if (ch1 != ch2)
+ {
+ printf ("%d: character at index %d not what is expected ('%c' vs '%c')\n",
+ rounds, idx, ch1, ch2);
+ result = 1;
+ break;
+ }
+
+ ch1 = fgetc (fp);
+ ch2 = tempdata[idx + 1];
+ if (ch1 != ch2)
+ {
+ printf ("%d: character at index %d not what is expected ('%c' vs '%c')\n",
+ rounds, idx + 1, ch1, ch2);
+ result = 1;
+ break;
+ }
+ }
+ while (--rounds > 0);
+
+ fclose (fp);
+
+ return result;
+}
+
+
+static int
+do_test (void)
+{
+ int fd;
+ FILE *fp;
+ int i;
+ int result;
+
+ fd = mkstemp (fname);
+ if (fd == -1)
+ {
+ printf ("cannot open temporary file: %m\n");
+ return 1;
+ }
+ /* Make sure the file gets removed. */
+ add_temp_file (fname);
+
+ /* Repeatability demands this. */
+ srandom (42);
+
+ /* First create some temporary data. */
+ for (i = 0; i < sizeof (tempdata); ++i)
+ tempdata[i] = (char) random ();
+
+ /* Write this data to a file. */
+ if (TEMP_FAILURE_RETRY (write (fd, tempdata, sizeof (tempdata)))
+ != sizeof (tempdata))
+ {
+ printf ("cannot wrote data to temporary file: %m\n");
+ return 1;
+ }
+
+ /* Now try reading the data. */
+ fp = fdopen (dup (fd), "r");
+ if (fp == NULL)
+ {
+ printf ("cannot duplicate temporary file descriptor: %m\n");
+ return 1;
+ }
+
+ rewind (fp);
+ for (i = 0; i < sizeof (tempdata); ++i)
+ {
+ int ch0 = fgetc (fp);
+ char ch1 = ch0;
+ char ch2 = tempdata[i];
+
+ if (ch0 == EOF)
+ {
+ puts ("premature end of file while reading data");
+ return 1;
+ }
+
+ if (ch1 != ch2)
+ {
+ printf ("%d: '%c' vs '%c'\n", i, ch1, ch2);
+ return 1;
+ }
+ }
+
+ result = fp_test (fp);
+
+ fp = fopen (fname, "r");
+ result |= fp_test (fp);
+
+ fp = fopen64 (fname, "r");
+ result |= fp_test (fp);
+
+ /* The "rw" mode will prevent the mmap-using code from being used. */
+ fp = fdopen (fd, "rw");
+ result = fp_test (fp);
+
+ fp = fopen (fname, "rw");
+ result |= fp_test (fp);
+
+ fp = fopen64 (fname, "rw");
+ result |= fp_test (fp);
+
+ return result;
+}