X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Futil.c;h=af975956dbca755091ca60981e5432e37b8328a4;hb=56d4fbf92eb6d8eb31c910e137224308c40dd909;hp=5f360085a29a75539adea7c89fab5fafd398a62e;hpb=0d0f0c50d3a1d90f03972a6abb82e6413daaa583;p=elogind.git

diff --git a/src/shared/util.c b/src/shared/util.c
index 5f360085a..af975956d 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -3774,18 +3774,27 @@ int fd_columns(int fd) {
         return ws.ws_col;
 }
 
-unsigned columns(void) {
-        static __thread int parsed_columns = 0;
+static unsigned columns_cached(bool cached) {
+        static __thread int parsed_columns = 0, env_columns = -1;
         const char *e;
 
-        if (_likely_(parsed_columns > 0))
+        if (_likely_(parsed_columns > 0 && cached))
                 return parsed_columns;
 
-        e = getenv("COLUMNS");
-        if (e)
-                parsed_columns = atoi(e);
+        if (_unlikely_(env_columns == -1)) {
+                e = getenv("COLUMNS");
+                if (e)
+                        env_columns = atoi(e);
+                else
+                        env_columns = 0;
+        }
 
-        if (parsed_columns <= 0)
+        if (env_columns > 0) {
+                parsed_columns = env_columns;
+                return parsed_columns;
+        }
+
+        if (parsed_columns <= 0 || !cached)
                 parsed_columns = fd_columns(STDOUT_FILENO);
 
         if (parsed_columns <= 0)
@@ -3794,6 +3803,14 @@ unsigned columns(void) {
         return parsed_columns;
 }
 
+unsigned columns(void) {
+        return columns_cached(true);
+}
+
+unsigned columns_uncached(void) {
+        return columns_cached(false);
+}
+
 int fd_lines(int fd) {
         struct winsize ws;
         zero(ws);