From 52f1552073047195d51901f7e5a5a4fa3189034e Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 23 Nov 2018 16:27:15 +0100
Subject: strv: add new macro STARTSWITH_SET()

This is to startswith() what PATH_STARTSWITH_SET() is to
path_startswith().

Or in other words, checks if the specified string has any of the listed
prefixes, and if so, returns the remainder of the string.
---
 src/basic/strv.h     | 12 ++++++++++++
 src/test/test-strv.c | 15 +++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/src/basic/strv.h b/src/basic/strv.h
index 5f1803d87d..aa4cd4aaca 100644
--- a/src/basic/strv.h
+++ b/src/basic/strv.h
@@ -144,6 +144,18 @@ void strv_print(char **l);
                 _x && strv_contains(STRV_MAKE(__VA_ARGS__), _x); \
         })
 
+#define STARTSWITH_SET(p, ...)                                  \
+        ({                                                      \
+                const char *_p = (p);                           \
+                char  *_found = NULL, **_i;                     \
+                STRV_FOREACH(_i, STRV_MAKE(__VA_ARGS__)) {      \
+                        _found = startswith(_p, *_i);           \
+                        if (_found)                             \
+                                break;                          \
+                }                                               \
+                _found;                                         \
+        })
+
 #define FOREACH_STRING(x, ...)                               \
         for (char **_l = ({                                  \
                 char **_ll = STRV_MAKE(__VA_ARGS__);         \
diff --git a/src/test/test-strv.c b/src/test/test-strv.c
index 63757afdce..31ef1abb44 100644
--- a/src/test/test-strv.c
+++ b/src/test/test-strv.c
@@ -56,6 +56,20 @@ static void test_strptr_in_set(void) {
         assert_se(!STRPTR_IN_SET(NULL, NULL));
 }
 
+static void test_startswith_set(void) {
+        assert_se(!STARTSWITH_SET("foo", "bar", "baz", "waldo"));
+        assert_se(!STARTSWITH_SET("foo", "bar"));
+
+        assert_se(STARTSWITH_SET("abc", "a", "ab", "abc"));
+        assert_se(STARTSWITH_SET("abc", "ax", "ab", "abc"));
+        assert_se(STARTSWITH_SET("abc", "ax", "abx", "abc"));
+        assert_se(!STARTSWITH_SET("abc", "ax", "abx", "abcx"));
+
+        assert_se(streq_ptr(STARTSWITH_SET("foobar", "hhh", "kkk", "foo", "zzz"), "bar"));
+        assert_se(streq_ptr(STARTSWITH_SET("foobar", "hhh", "kkk", "", "zzz"), "foobar"));
+        assert_se(streq_ptr(STARTSWITH_SET("", "hhh", "kkk", "zzz", ""), ""));
+}
+
 static const char* const input_table_multiple[] = {
         "one",
         "two",
@@ -847,6 +861,7 @@ int main(int argc, char *argv[]) {
         test_specifier_printf();
         test_str_in_set();
         test_strptr_in_set();
+        test_startswith_set();
         test_strv_foreach();
         test_strv_foreach_backwards();
         test_strv_foreach_pair();
-- 
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