From 07de3e94bec7f426258007c4a790a78589d2fee3 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 7 Jan 2016 19:43:26 +0100
Subject: basic: introduce generic ascii_strlower_n() call and make use of it
 everywhere

---
 src/basic/string-util.c | 23 +++++++++++++++++++++--
 src/basic/string-util.h |  4 +++-
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/src/basic/string-util.c b/src/basic/string-util.c
index 2c9754db0..e2bdb8976 100644
--- a/src/basic/string-util.c
+++ b/src/basic/string-util.c
@@ -310,14 +310,33 @@ char *truncate_nl(char *s) {
         return s;
 }
 
+char ascii_tolower(char x) {
+
+        if (x >= 'A' && x <= 'Z')
+                return x - 'A' + 'a';
+
+        return x;
+}
+
 char *ascii_strlower(char *t) {
         char *p;
 
         assert(t);
 
         for (p = t; *p; p++)
-                if (*p >= 'A' && *p <= 'Z')
-                        *p = *p - 'A' + 'a';
+                *p = ascii_tolower(*p);
+
+        return t;
+}
+
+char *ascii_strlower_n(char *t, size_t n) {
+        size_t i;
+
+        if (n <= 0)
+                return t;
+
+        for (i = 0; i < n; i++)
+                t[i] = ascii_tolower(t[i]);
 
         return t;
 }
diff --git a/src/basic/string-util.h b/src/basic/string-util.h
index 54f9d3058..8b87c1e23 100644
--- a/src/basic/string-util.h
+++ b/src/basic/string-util.h
@@ -128,7 +128,9 @@ char *strstrip(char *s);
 char *delete_chars(char *s, const char *bad);
 char *truncate_nl(char *s);
 
-char *ascii_strlower(char *path);
+char ascii_tolower(char x);
+char *ascii_strlower(char *s);
+char *ascii_strlower_n(char *s, size_t n);
 
 bool chars_intersect(const char *a, const char *b) _pure_;
 
-- 
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