basic: introduce generic ascii_strlower_n() call and make use of it everywhere

2 files changed, 3 insertions, 13 deletions

diff --git a/src/resolve/resolved-dns-dnssec.c b/src/resolve/resolved-dns-dnssec.c
index e71939d999..d5eda6a6dd 100644
--- a/src/resolve/resolved-dns-dnssec.c
+++ b/src/resolve/resolved-dns-dnssec.c
@@ -890,8 +890,6 @@ int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max) {
                 return -ENOBUFS;
 
         for (;;) {
-                size_t i;
-
                 r = dns_label_unescape(&n, buffer, buffer_max);
                 if (r < 0)
                         return r;
@@ -918,11 +916,7 @@ int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max) {
                 if (memchr(buffer, '.', r))
                         return -EINVAL;
 
-                for (i = 0; i < (size_t) r; i ++) {
-                        if (buffer[i] >= 'A' && buffer[i] <= 'Z')
-                                buffer[i] = buffer[i] - 'A' + 'a';
-                }
-
+                ascii_strlower_n(buffer, (size_t) r);
                 buffer[r] = '.';
 
                 buffer += r + 1;
diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index 8a360a29fb..a8a8632491 100644
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -466,12 +466,8 @@ int dns_packet_append_label(DnsPacket *p, const char *d, size_t l, bool canonica
                 /* Generate in canonical form, as defined by DNSSEC
                  * RFC 4034, Section 6.2, i.e. all lower-case. */
 
-                for (i = 0; i < l; i++) {
-                        if (d[i] >= 'A' && d[i] <= 'Z')
-                                w[i] = (uint8_t) (d[i] - 'A' + 'a');
-                        else
-                                w[i] = (uint8_t) d[i];
-                }
+                for (i = 0; i < l; i++)
+                        w[i] = (uint8_t) ascii_tolower(d[i]);
         } else
                 /* Otherwise, just copy the string unaltered. This is
                  * essential for DNS-SD, where the casing of labels