Merge pull request #9462 from yuwata/strv_split

make strv_split() accept empty string and use it in pager_open()

src/basic/pager.c

@@ -43,6 +43,7 @@ _noreturn_ static void pager_fallback(void) {
 
 int pager_open(bool no_pager, bool jump_to_end) {
         _cleanup_close_pair_ int fd[2] = { -1, -1 };
+        _cleanup_strv_free_ char **pager_args = NULL;
         const char *pager;
         int r;
 
@@ -62,9 +63,15 @@ int pager_open(bool no_pager, bool jump_to_end) {
         if (!pager)
                 pager = getenv("PAGER");
 
-        /* If the pager is explicitly turned off, honour it */
-        if (pager && STR_IN_SET(pager, "", "cat"))
-                return 0;
+        if (pager) {
+                pager_args = strv_split(pager, WHITESPACE);
+                if (!pager_args)
+                        return -ENOMEM;
+
+                /* If the pager is explicitly turned off, honour it */
+                if (strv_isempty(pager_args) || strv_equal(pager_args, STRV_MAKE("cat")))
+                        return 0;
+        }
 
         /* Determine and cache number of columns/lines before we spawn the pager so that we get the value from the
          * actual tty */
@@ -104,10 +111,8 @@ int pager_open(bool no_pager, bool jump_to_end) {
                     setenv("LESSCHARSET", less_charset, 1) < 0)
                         _exit(EXIT_FAILURE);
 
-                if (pager) {
-                        execlp(pager, pager, NULL);
-                        execl("/bin/sh", "sh", "-c", pager, NULL);
-                }
+                if (pager_args)
+                        execvp(pager_args[0], pager_args);
 
                 /* Debian's alternatives command for pagers is
                  * called 'pager'. Note that we do not call

src/basic/strv.c

@@ -253,6 +253,10 @@ char **strv_split(const char *s, const char *separator) {
 
         assert(s);
 
+        s += strspn(s, separator);
+        if (isempty(s))
+                return new0(char*, 1);
+
         n = 0;
         FOREACH_WORD_SEPARATOR(word, l, s, separator, state)
                 n++;

src/systemctl/systemctl.c

@@ -6785,11 +6785,9 @@ static int run_editor(char **paths) {
         if (r < 0)
                 return r;
         if (r == 0) {
-                const char **args;
-                char *editor, **editor_args = NULL;
-                char **tmp_path, **original_path, *p;
-                size_t n_editor_args = 0, i = 1;
-                size_t argc;
+                char **editor_args = NULL, **tmp_path, **original_path, *p;
+                size_t n_editor_args = 0, i = 1, argc;
+                const char **args, *editor;
 
                 argc = strv_length(paths)/2 + 1;
 

src/test/test-strv.c

@@ -180,12 +180,31 @@ static void test_strv_split(void) {
         const char str[] = "one,two,three";
 
         l = strv_split(str, ",");
-
         assert_se(l);
-
-        STRV_FOREACH(s, l) {
+        STRV_FOREACH(s, l)
                 assert_se(streq(*s, input_table_multiple[i++]));
-        }
+
+        i = 0;
+        strv_free(l);
+
+        l = strv_split("    one    two\t three", WHITESPACE);
+        assert_se(l);
+        STRV_FOREACH(s, l)
+                assert_se(streq(*s, input_table_multiple[i++]));
+}
+
+static void test_strv_split_empty(void) {
+        _cleanup_strv_free_ char **l = NULL;
+
+        l = strv_split("", WHITESPACE);
+        assert_se(l);
+        assert_se(strv_isempty(l));
+
+        strv_free(l);
+        l = strv_split("    ", WHITESPACE);
+        assert_se(l);
+        assert_se(strv_isempty(l));
+
 }
 
 static void test_strv_split_extract(void) {
@@ -733,6 +752,7 @@ int main(int argc, char *argv[]) {
         test_invalid_unquote("'x'y'g");
 
         test_strv_split();
+        test_strv_split_empty();
         test_strv_split_extract();
         test_strv_split_newlines();
         test_strv_split_nulstr();