tree-wide: drop 'This file is part of systemd' blurb

[elogind.git] / src / basic / utf8.c

diff --git a/src/basic/utf8.c b/src/basic/utf8.c
index 1e86949a420ac8910eb087fe25e5951ad807c2c9..3b8b7b12cb83155d931cdeea9a2cbf1db6905507 100644 (file)
--- a/src/basic/utf8.c
+++ b/src/basic/utf8.c
@@ -1,7 +1,5 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 /***
-  This file is part of systemd.
-
   Copyright 2008-2011 Kay Sievers
   Copyright 2012 Lennart Poettering
 ***/
@@ -247,6 +245,9 @@ char *utf8_escape_non_printable(const char *str) {
 char *ascii_is_valid(const char *str) {
         const char *p;
 
+        /* Check whether the string consists of valid ASCII bytes,
+         * i.e values between 0 and 127, inclusive. */
+
         assert(str);
 
         for (p = str; *p; p++)
@@ -256,6 +257,21 @@ char *ascii_is_valid(const char *str) {
         return (char*) str;
 }
 
+char *ascii_is_valid_n(const char *str, size_t len) {
+        size_t i;
+
+        /* Very similar to ascii_is_valid(), but checks exactly len
+         * bytes and rejects any NULs in that range. */
+
+        assert(str);
+
+        for (i = 0; i < len; i++)
+                if ((unsigned char) str[i] >= 128 || str[i] == 0)
+                        return NULL;
+
+        return (char*) str;
+}
+
 /**
  * utf8_encode_unichar() - Encode single UCS-4 character as UTF-8
  * @out_utf8: output buffer of at least 4 bytes or NULL