Initial data commit

Task/Sorting-algorithms-Cocktail-sort-with-shifting-bounds/C/sorting-algorithms-cocktail-sort-with-shifting-bounds.c

@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <string.h>
+
+void swap(char* p1, char* p2, size_t size) {
+    for (; size-- > 0; ++p1, ++p2) {
+        char tmp = *p1;
+        *p1 = *p2;
+        *p2 = tmp;
+    }
+}
+
+void cocktail_shaker_sort(void* base, size_t count, size_t size,
+                          int (*cmp)(const void*, const void*)) {
+    char* begin = base;
+    char* end = base + size * count;
+    if (end == begin)
+        return;
+    for (end -= size; begin < end; ) {
+        char* new_begin = end;
+        char* new_end = begin;
+        for (char* p = begin; p < end; p += size) {
+            char* q = p + size;
+            if (cmp(p, q) > 0) {
+                swap(p, q, size);
+                new_end = p;
+            }
+        }
+        end = new_end;
+        for (char* p = end; p > begin; p -= size) {
+            char* q = p - size;
+            if (cmp(q, p) > 0) {
+                swap(p, q, size);
+                new_begin = p;
+            }
+        }
+        begin = new_begin;
+    }
+}
+
+int string_compare(const void* p1, const void* p2) {
+    const char* const* s1 = p1;
+    const char* const* s2 = p2;
+    return strcmp(*s1, *s2);
+}
+
+void print(const char** a, size_t len) {
+    for (size_t i = 0; i < len; ++i)
+        printf("%s ", a[i]);
+    printf("\n");
+}
+
+int main() {
+    const char* a[] = { "one", "two", "three", "four", "five",
+        "six", "seven", "eight" };
+    const size_t len = sizeof(a)/sizeof(a[0]);
+    printf("before: ");
+    print(a, len);
+    cocktail_shaker_sort(a, len, sizeof(char*), string_compare);
+    printf("after: ");
+    print(a, len);
+    return 0;
+}