From: Lennart Poettering <lennart@amutable.com>
Date: Wed, 15 Apr 2026 14:05:37 +0000 (+0200)
Subject: string-util: add new strrstr_no_case() call
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=2561159d397d8cb70e14d7e2b4a7b722a02854d6;p=thirdparty%2Fsystemd.git

string-util: add new strrstr_no_case() call
---

diff --git a/src/basic/string-util.c b/src/basic/string-util.c
index 9b63516ce09..c3298bc8eee 100644
--- a/src/basic/string-util.c
+++ b/src/basic/string-util.c
@@ -1530,6 +1530,17 @@ char* strrstr_internal(const char *haystack, const char *needle) {
         return NULL;
 }
 
+char* strrstr_no_case_internal(const char *haystack, const char *needle) {
+        if (!haystack || !needle)
+                return NULL;
+
+        for (const char *p = strchr(haystack, 0); p > haystack; p--)
+                if (startswith_no_case(p, needle))
+                        return (char*) p;
+
+        return startswith_no_case(haystack, needle) ? (char*) haystack : NULL;
+}
+
 size_t str_common_prefix(const char *a, const char *b) {
         assert(a);
         assert(b);
diff --git a/src/basic/string-util.h b/src/basic/string-util.h
index 5ab4dd9016d..65fe5072b30 100644
--- a/src/basic/string-util.h
+++ b/src/basic/string-util.h
@@ -312,4 +312,8 @@ char* strrstr_internal(const char *haystack, const char *needle) _pure_;
 #define strrstr(haystack, needle) \
         const_generic(haystack, strrstr_internal(haystack, needle))
 
+char* strrstr_no_case_internal(const char *haystack, const char *needle) _pure_;
+#define strrstr_no_case(haystack, needle) \
+        const_generic(haystack, strrstr_no_case_internal(haystack, needle))
+
 size_t str_common_prefix(const char *a, const char *b) _pure_;
diff --git a/src/test/test-string-util.c b/src/test/test-string-util.c
index 8490f34f696..5707569e7e1 100644
--- a/src/test/test-string-util.c
+++ b/src/test/test-string-util.c
@@ -535,6 +535,29 @@ TEST(endswith_no_case) {
         assert_se(!endswith_no_case("foobar", "FOOBARFOOFOO"));
 }
 
+TEST(strrstr_no_case) {
+        ASSERT_STREQ(strrstr_no_case("fooBARfoobar", "bar"), "bar");
+        ASSERT_STREQ(strrstr_no_case("fooBARfoobar", "BAR"), "bar");
+        ASSERT_STREQ(strrstr_no_case("fooBARfoobar", "bAR"), "bar");
+        ASSERT_STREQ(strrstr_no_case("fooBARfoobar", "FOO"), "foobar");
+        ASSERT_STREQ(strrstr_no_case("fooBARfoobar", "foo"), "foobar");
+        ASSERT_STREQ(strrstr_no_case("fooBARfoobar", "FoO"), "foobar");
+        ASSERT_STREQ(strrstr_no_case("aXaXa", "x"), "Xa");
+        ASSERT_STREQ(strrstr_no_case("aXaXa", "X"), "Xa");
+        ASSERT_STREQ(strrstr_no_case("xHello", "hello"), "Hello");
+        ASSERT_STREQ(strrstr_no_case("Hello", "l"), "lo");
+        ASSERT_STREQ(strrstr_no_case("Hello", ""), "");
+        ASSERT_STREQ(strrstr_no_case("", ""), "");
+        ASSERT_STREQ(strrstr_no_case("FOO", "foo"), "FOO");
+        ASSERT_STREQ(strrstr_no_case("hello", "hello"), "hello");
+        ASSERT_STREQ(strrstr_no_case("X", "x"), "X");
+
+        ASSERT_NULL(strrstr_no_case("hello", "xyz"));
+        ASSERT_NULL(strrstr_no_case("", "x"));
+        ASSERT_NULL(strrstr_no_case(NULL, "x"));
+        ASSERT_NULL(strrstr_no_case("x", NULL));
+}
+
 TEST(delete_chars) {
         char *s, input[] = "   hello, waldo.   abc";