From 2af19ecff5e59ff83e26d9fac8f88ad7314eeb26 Mon Sep 17 00:00:00 2001
From: Bastian Dehn <hhaalo@arcor.de>
Date: Mon, 2 Mar 2026 21:54:31 +0100
Subject: [PATCH] change replac string

---
 src/rename.c         | 44 ++++++++++++++++++++++++++------------------
 src/rename.h         |  2 +-
 tests/rename_tests.c |  7 +++++--
 3 files changed, 32 insertions(+), 21 deletions(-)

diff --git a/src/rename.c b/src/rename.c
index 35d6646..97544ad 100644
--- a/src/rename.c
+++ b/src/rename.c
@@ -123,19 +123,25 @@ void rename_lower(const char* src, char* dst)
 
 void rename_string(const char* src, char* dst)
 {
-	uint16_t dst_count = 0;
-	size_t length = strlen(src);
-	for (size_t i = 0; i < length; i++) {
-		switch (wide_char_length(src[i])) {
-		case 2:
-			dst_count += _replace_two_byte_wide_char(&src[i], &dst[dst_count]);
-			i++;
-			break;
-		default:
-			dst_count += _replace_char(src[i], &dst[dst_count]);
-			break;
-		}
-	}
+	size_t len = strlen(src) + 1;
+	char* out = malloc(len);
+	if (out == NULL)
+		return;
+
+	memcpy(out, src, len);
+
+	out = replace(&out, " ", "_");
+	out = replace(&out, "ä", "ae");
+	out = replace(&out, "Ä", "Ae");
+	out = replace(&out, "ö", "oe");
+	out = replace(&out, "Ö", "Oe");
+	out = replace(&out, "ü", "ue");
+	out = replace(&out, "Ü", "Ue");
+	out = replace(&out, "ß", "ss");
+	
+	memcpy(dst, out, strlen(out) + 1);
+	free(out);
+	out = NULL;
 }
 
 void rename_revert(const char* src, char* dst)
@@ -179,14 +185,14 @@ void rename_revert(const char* src, char* dst)
 	}
 }
 
-char* replace(const char* src, const char* pattern, const char* replace_str)
+char* replace(char** src, const char* pattern, const char* replace_str)
 {
-	const size_t len = strlen(src);
+	const size_t len = strlen(*src);
 	const size_t plen = strlen(pattern);
 
 	uint32_t count = 0;
 	for (uint32_t i = 0; i < len; i++) {
-		if (strncmp(&src[i], pattern, plen) == 0)
+		if (strncmp(*src + i, pattern, plen) == 0)
 			count++;
 	}
 
@@ -200,14 +206,16 @@ char* replace(const char* src, const char* pattern, const char* replace_str)
 
 	uint32_t outi = 0;
 	for (uint32_t i = 0; i < len; i++) {
-		if (strncmp(&src[i], pattern, plen) == 0) {
+		if (strncmp(*src + i, pattern, plen) == 0) {
 			memcpy(&output[outi], replace_str, rlen);
 			i += plen - 1;
 			outi += rlen;
 		} else {
-			output[outi++] = src[i];
+			output[outi++] = (*src)[i];
 		}
 	}
 
+	free(*src);
+	*src = NULL;
 	return output;
 }
\ No newline at end of file
diff --git a/src/rename.h b/src/rename.h
index 90c2f19..8bab7ff 100644
--- a/src/rename.h
+++ b/src/rename.h
@@ -40,6 +40,6 @@ void rename_lower(const char* src, char* dst);
 void rename_string(const char* src, char* dst);
 void rename_revert(const char* src, char* dst);
 
-char* replace(const char* src, const char* pattern, const char* replace_str);
+char* replace(char** src, const char* pattern, const char* replace_str);
 
 #endif
\ No newline at end of file
diff --git a/tests/rename_tests.c b/tests/rename_tests.c
index a6e052c..4b12af2 100644
--- a/tests/rename_tests.c
+++ b/tests/rename_tests.c
@@ -269,9 +269,12 @@ void four_byte_wide_character()
 
 void replace_string()
 {
-	const char* input = "Hello Max!";
+	char* input = malloc(sizeof(char) * 11);
+	if (input == NULL)
+		return;
+	memcpy(input, "Hello Max!", 11);
 
-	char* output = replace(input, "Max", "World");
+	char* output = replace(&input, "Max", "World");
 
 	assert_string_equal(output, "Hello World!");
 
-- 
2.47.3