From c49d5f5421c7444e547cab03a111cc8726b2c555 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9o=20LUDWIG?= <contact@theoludwig.fr>
Date: Thu, 12 Sep 2024 12:31:58 +0200
Subject: [PATCH] feat: add `string_zero_pad`

---
 lib/string.c       |  9 +++++++++
 lib/string.h       | 12 ++++++++++++
 test/string_test.c | 11 +++++++++++
 test/string_test.h |  2 ++
 4 files changed, 34 insertions(+)

diff --git a/lib/string.c b/lib/string.c
index c4da49d..b52253d 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -431,3 +431,12 @@ string_t string_pad_start(const string_t string, const string_t pad_string, size
   result[target_length] = '\0';
   return result;
 }
+
+string_t string_zero_pad(uint64_t number, size_t places) {
+  string_t number_string = convert_number_to_string((long long)number);
+  string_t pad_string = string_copy("0");
+  string_t result = string_pad_start(number_string, pad_string, places);
+  free(pad_string);
+  free(number_string);
+  return result;
+}
diff --git a/lib/string.h b/lib/string.h
index 895ad09..b6ff5a0 100644
--- a/lib/string.h
+++ b/lib/string.h
@@ -298,4 +298,16 @@ size_t string_last_position_of(const string_t string, const char character);
  */
 string_t string_pad_start(const string_t string, const string_t pad_string, size_t target_length);
 
+/**
+ * @brief Pad a number with zeros.
+ *
+ * @param number
+ * @param places
+ * @return string_t
+ * @example zero_pad(1, 2) // "01"
+ * @example zero_pad(10, 2) // "10"
+ * @since vTODO
+ */
+string_t string_zero_pad(uint64_t number, size_t places);
+
 #endif
diff --git a/test/string_test.c b/test/string_test.c
index 0590b97..37b2b78 100644
--- a/test/string_test.c
+++ b/test/string_test.c
@@ -28,6 +28,7 @@ void string_test() {
   string_position_of_test();
   string_last_position_of_test();
   string_pad_start_test();
+  string_zero_pad_test();
 }
 
 void string_get_length_test() {
@@ -322,3 +323,13 @@ void string_pad_start_test() {
   assert(assert_string_equal(result, "ahello"));
   free(result);
 }
+
+void string_zero_pad_test() {
+  string_t result = string_zero_pad(1, 2);
+  assert(assert_string_equal(result, "01"));
+  free(result);
+
+  result = string_zero_pad(10, 2);
+  assert(assert_string_equal(result, "10"));
+  free(result);
+}
diff --git a/test/string_test.h b/test/string_test.h
index f3e44b9..bcef767 100644
--- a/test/string_test.h
+++ b/test/string_test.h
@@ -64,4 +64,6 @@ void string_last_position_of_test();
 
 void string_pad_start_test();
 
+void string_zero_pad_test();
+
 #endif