Feature: Implemented UUID generation

src/uuid.c

@@ -20,17 +20,72 @@
 #include <config.h>
 #endif
 
+#include <stdio.h>
+#include <string.h>
+
 #include <igloo/uuid.h>
 #include <igloo/sp.h>
 #include <igloo/error.h>
+#include <igloo/prng.h>
+
+#define UUID_LENGTH_BINARY  16
+#define UUID_LENGTH_STRING  36
+
+static igloo_error_t igloo_uuid_new_random_r(char *buffer, igloo_ro_t instance)
+{
+    unsigned char id[UUID_LENGTH_BINARY];
+
+    if (!buffer)
+        return igloo_ERROR_FAULT;
+
+    if (igloo_prng_read(instance, id, sizeof(id), igloo_PRNG_FLAG_NONE) != sizeof(id))
+        return igloo_ERROR_IO;
+
+    id[6] = (id[6] & 0x0F) | 0x40;
+    id[8] = (id[8] & 0x3F) | 0x80;
+
+    //  0 1 2 3  4 5  6 7  8 9 101112131415
+    // 551a9547-fe63-45cf-a153-2801bac47ff8
+    snprintf(buffer, UUID_LENGTH_STRING+1, "%.2x%.2x%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x",
+            (unsigned int)id[0], (unsigned int)id[1], (unsigned int)id[2], (unsigned int)id[3],
+            (unsigned int)id[4], (unsigned int)id[5],
+            (unsigned int)id[6], (unsigned int)id[7],
+            (unsigned int)id[8], (unsigned int)id[9],
+            (unsigned int)id[10], (unsigned int)id[11], (unsigned int)id[12],
+            (unsigned int)id[13], (unsigned int)id[14], (unsigned int)id[15]
+            );
 
+    return igloo_ERROR_NONE;
+}
 
 igloo_error_t igloo_uuid_new_random_sp(const char **ref, igloo_ro_t instance)
 {
-    return igloo_ERROR_NOSYS;
+    char buffer[UUID_LENGTH_STRING+1];
+    igloo_error_t error = igloo_uuid_new_random_r(buffer, instance);
+
+    if (error != igloo_ERROR_NONE)
+        return error;
+
+    return igloo_sp_replace(buffer, ref, instance);
 }
 
 igloo_error_t igloo_uuid_new_random_cstr(char **str, igloo_ro_t instance)
 {
-    return igloo_ERROR_NOSYS;
+    char buffer[UUID_LENGTH_STRING+1];
+    igloo_error_t error = igloo_uuid_new_random_r(buffer, instance);
+    char *res;
+
+    if (!str || *str)
+        return igloo_ERROR_FAULT;
+
+    if (error != igloo_ERROR_NONE)
+        return error;
+
+    res = strdup(buffer);
+    if (res == NULL)
+        return igloo_ERROR_NOMEM;
+
+    *str = res;
+
+    return igloo_ERROR_NONE;
 }