X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fbasic%2Fstring-util.h;h=1209e1e2e14c11853b526891d31b34584c36db68;hb=9facc64034a98d593cf5b577e979aa78e3b184bf;hp=ad0c813761ed9dc81dd9aa254b54421719cc0b20;hpb=07045a1a92c839fd2af80bd0c060a595021bc3b3;p=elogind.git

diff --git a/src/basic/string-util.h b/src/basic/string-util.h
index ad0c81376..1209e1e2e 100644
--- a/src/basic/string-util.h
+++ b/src/basic/string-util.h
@@ -37,6 +37,7 @@
 #define UPPERCASE_LETTERS "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 #define LETTERS           LOWERCASE_LETTERS UPPERCASE_LETTERS
 #define ALPHANUMERICAL    LETTERS DIGITS
+#define HEXDIGITS         DIGITS "abcdefABCDEF"
 
 #define streq(a,b) (strcmp((a),(b)) == 0)
 #define strneq(a, b, n) (strncmp((a), (b), (n)) == 0)
@@ -65,6 +66,10 @@ static inline bool isempty(const char *p) {
         return !p || !p[0];
 }
 
+static inline const char *empty_to_null(const char *p) {
+        return isempty(p) ? NULL : p;
+}
+
 static inline char *startswith(const char *s, const char *prefix) {
         size_t l;