X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fbasic%2Fstrv.h;h=0a908c89345db05ffc25fe1d89c7a6251fa2094f;hp=8e83ffde755016432450df90eaa0ccc5f21a7675;hb=7dd230537883c50e572752574e08c94aef5efa7f;hpb=07045a1a92c839fd2af80bd0c060a595021bc3b3

diff --git a/src/basic/strv.h b/src/basic/strv.h
index 8e83ffde7..0a908c893 100644
--- a/src/basic/strv.h
+++ b/src/basic/strv.h
@@ -54,6 +54,7 @@ int strv_extend(char ***l, const char *value);
 #if 0 /// UNNEEDED by elogind
 int strv_extendf(char ***l, const char *format, ...) _printf_(2,0);
 #endif // 0
+int strv_extend_front(char ***l, const char *value);
 int strv_push(char ***l, char *value);
 int strv_push_pair(char ***l, char *a, char *b);
 int strv_push_prepend(char ***l, char *value);
@@ -76,8 +77,10 @@ bool strv_equal(char **a, char **b);
 char **strv_new(const char *x, ...) _sentinel_;
 char **strv_new_ap(const char *x, va_list ap);
 
+#define STRV_IGNORE ((const char *) -1)
+
 static inline const char* STRV_IFNOTNULL(const char *x) {
-        return x ? x : (const char *) -1;
+        return x ? x : STRV_IGNORE;
 }
 
 static inline bool strv_isempty(char * const *l) {
@@ -90,6 +93,7 @@ char **strv_split_newlines(const char *s);
 
 int strv_split_extract(char ***t, const char *s, const char *separators, ExtractFlags flags);
 #endif // 0
+
 char *strv_join(char **l, const char *separator);
 #if 0 /// UNNEEDED by elogind
 char *strv_join_quoted(char **l);
@@ -102,13 +106,17 @@ int strv_make_nulstr(char **l, char **p, size_t *n);
 
 bool strv_overlap(char **a, char **b) _pure_;
 #endif // 0
+
 #define STRV_FOREACH(s, l)                      \
         for ((s) = (l); (s) && *(s); (s)++)
 
-#define STRV_FOREACH_BACKWARDS(s, l)            \
-        STRV_FOREACH(s, l)                      \
-                ;                               \
-        for ((s)--; (l) && ((s) >= (l)); (s)--)
+#define STRV_FOREACH_BACKWARDS(s, l)                                \
+        for (s = ({                                                 \
+                        char **_l = l;                              \
+                        _l ? _l + strv_length(_l) - 1U : NULL;      \
+                        });                                         \
+             (l) && ((s) >= (l));                                   \
+             (s)--)
 
 #define STRV_FOREACH_PAIR(x, y, l)               \
         for ((x) = (l), (y) = (x+1); (x) && *(x) && *(y); (x) += 2, (y) = (x + 1))
@@ -152,6 +160,11 @@ void strv_print(char **l);
         })
 
 #define STR_IN_SET(x, ...) strv_contains(STRV_MAKE(__VA_ARGS__), x)
+#define STRPTR_IN_SET(x, ...)                                    \
+        ({                                                       \
+                const char* _x = (x);                            \
+                _x && strv_contains(STRV_MAKE(__VA_ARGS__), _x); \
+        })
 
 #define FOREACH_STRING(x, ...)                               \
         for (char **_l = ({                                  \