summaryrefslogtreecommitdiff
path: root/test/stdlib/qsort.c
diff options
context:
space:
mode:
Diffstat (limited to 'test/stdlib/qsort.c')
-rw-r--r--test/stdlib/qsort.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/test/stdlib/qsort.c b/test/stdlib/qsort.c
new file mode 100644
index 0000000..74f9331
--- /dev/null
+++ b/test/stdlib/qsort.c
@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static int select_files(const struct dirent *dirbuf)
+{
+ if (dirbuf->d_name[0] == '.')
+ return 0;
+ else
+ return 1;
+}
+
+int main(void)
+{
+ struct dirent **array;
+ struct dirent *dirbuf;
+
+ int i, numdir;
+
+ chdir("/");
+ numdir = scandir(".", &array, select_files, NULL);
+ printf("\nGot %d entries from scandir().\n", numdir);
+ for (i = 0; i < numdir; ++i) {
+ dirbuf = array[i];
+ printf("[%d] %s\n", i, dirbuf->d_name);
+ free(array[i]);
+ }
+ free(array);
+ numdir = scandir(".", &array, select_files, alphasort);
+ printf("\nGot %d entries from scandir() using alphasort().\n", numdir);
+ for (i = 0; i < numdir; ++i) {
+ dirbuf = array[i];
+ printf("[%d] %s\n", i, dirbuf->d_name);
+ }
+ printf("\nCalling qsort()\n");
+ /* Even though some manpages say that alphasort should be
+ * int alphasort(const void *a, const void *b),
+ * in reality glibc and uclibc have const struct dirent**
+ * instead of const void*.
+ * Therefore we get a warning here unless we use a cast,
+ * which makes people think that alphasort prototype
+ * needs to be fixed in uclibc headers.
+ */
+ qsort(array, numdir, sizeof(struct dirent *), (void*) alphasort);
+ for (i = 0; i < numdir; ++i) {
+ dirbuf = array[i];
+ printf("[%d] %s\n", i, dirbuf->d_name);
+ free(array[i]);
+ }
+ free(array);
+ return (0);
+}