1 files changed, 51 insertions, 2 deletions

diff --git a/src/basic/string-util.c b/src/basic/string-util.c
index 8178c7093f..1f95a9abba 100644
--- a/src/basic/string-util.c
+++ b/src/basic/string-util.c
@@ -317,18 +317,67 @@ 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;
+}
+
+int ascii_strcasecmp_n(const char *a, const char *b, size_t n) {
+
+        for (; n > 0; a++, b++, n--) {
+                int x, y;
+
+                x = (int) (uint8_t) ascii_tolower(*a);
+                y = (int) (uint8_t) ascii_tolower(*b);
+
+                if (x != y)
+                        return x - y;
+        }
+
+        return 0;
+}
+
+int ascii_strcasecmp_nn(const char *a, size_t n, const char *b, size_t m) {
+        int r;
+
+        r = ascii_strcasecmp_n(a, b, MIN(n, m));
+        if (r != 0)
+                return r;
+
+        if (n < m)
+                return -1;
+        else if (n > m)
+                return 1;
+        else
+                return 0;
+}
+
 bool chars_intersect(const char *a, const char *b) {
         const char *p;