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mobile-nixos/overlay/make_ext4fs/0001-uuid-add-facilities-to-parse-and-print-UUIDs.patch
2019-08-29 18:14:18 -04:00

83 lines
2.1 KiB
Diff

From 5c2e0b7b5911477dcc4dedfd9910e28e9af65a91 Mon Sep 17 00:00:00 2001
From: Samuel Dionne-Riel <samuel@dionne-riel.com>
Date: Thu, 29 Aug 2019 15:07:36 -0400
Subject: [PATCH 1/2] uuid: add facilities to parse and print UUIDs
Signed-off-by: Samuel Dionne-Riel <samuel@dionne-riel.com>
---
uuid.c | 43 +++++++++++++++++++++++++++++++++++++++++++
uuid.h | 6 ++++++
2 files changed, 49 insertions(+)
diff --git a/uuid.c b/uuid.c
index 7ded43a..47ef097 100644
--- a/uuid.c
+++ b/uuid.c
@@ -59,3 +59,46 @@ void generate_uuid(const char *namespace, const char *name, u8 result[16])
uuid->clk_seq_hi_res &= ~(1 << 6);
uuid->clk_seq_hi_res |= 1 << 7;
}
+
+void parse_uuid(const char *input, uint8_t result [16])
+{
+ int u = 0;
+ if (strlen(input) != UUID_STR_LEN-1) {
+ fprintf(stderr, "UUID MUST be in the format 00112233-4455-6677-8899-AABBCCDDEEFF.\n");
+ abort();
+ }
+ for (int i = 0; i < UUID_STR_LEN - 1; i++) {
+ if (i == 8 || i == 13 || i == 18 || i == 23) {
+ /* Skip hyphens */
+ }
+ else {
+ char pair[3] = "00";
+ strncpy(pair, input + i, 2);
+ result[u] = strtol(pair, NULL, 16);
+ /* This handled a pair, let's move one more further along. */
+ i++;
+ /* Move to the next byte. */
+ u++;
+ }
+ }
+}
+
+void uuid_to_string(const uint8_t uuid [16], char result [UUID_STR_LEN])
+{
+ /* Index in uuid */
+ int u = 0;
+ for (int i = 0; i < UUID_STR_LEN-1; i++) {
+ /* Handles separators */
+ if (i == 8 || i == 13 || i == 18 || i == 23) {
+ strcpy(result+i, "-");
+ }
+ else {
+ /* This writes \0 at the end of every invocation */
+ snprintf(result+i, 3, "%02X", uuid[u]);
+ /* This handled a pair, let's move one more further along. */
+ i++;
+ /* Move to the next byte. */
+ u++;
+ }
+ }
+}
diff --git a/uuid.h b/uuid.h
index ff1b438..21ba165 100644
--- a/uuid.h
+++ b/uuid.h
@@ -19,6 +19,12 @@
#include "ext4_utils.h"
+#define UUID_STR_LEN 36+1
+
void generate_uuid(const char *namespace, const char *name, u8 result[16]);
+void parse_uuid(const char *input, uint8_t result [16]);
+
+void uuid_to_string(const uint8_t uuid [16], char result [UUID_STR_LEN]);
+
#endif
--
2.19.2