common: add simple guid generator function

2 files changed, 23 insertions, 0 deletions

diff --git a/src/common.c b/src/common.c
index 8e76697..57f465a 100644
--- a/src/common.c
+++ b/src/common.c
@@ -108,3 +108,24 @@ void print_progress_bar(double progress) {
 	if(progress == 100) info("\n");
 	fflush(stdout);
 }
+
+#define GET_RAND(min, max) ((rand() % (max - min)) + min)
+
+char *generate_guid()
+{
+	char *guid = (char *) malloc(sizeof(char) * 37);
+	const char *chars = "ABCDEF0123456789";
+	srand(time(NULL));
+	int i = 0;
+
+	for (i = 0; i < 36; i++) {
+		if (i == 8 || i == 13 || i == 18 || i == 23) {
+			guid[i] = '-';
+			continue;
+		} else {
+			guid[i] = chars[GET_RAND(0, 16)];
+		}
+	}
+	guid[36] = '\0';
+	return guid;
+}
diff --git a/src/common.h b/src/common.h
index b6873a2..5568930 100644
--- a/src/common.h
+++ b/src/common.h
@@ -171,6 +171,8 @@ void print_progress_bar(double progress);
 int read_file(const char* filename, void** data, size_t* size);
 int write_file(const char* filename, const void* data, size_t size);
 
+char *generate_guid();
+
 extern struct idevicerestore_client_t* idevicerestore;
 
 #ifdef __cplusplus