basic/escape: add helper for quoting command lines

src/basic/escape.c

@@ -8,6 +8,7 @@
 #include "escape.h"
 #include "hexdecoct.h"
 #include "macro.h"
+#include "strv.h"
 #include "utf8.h"
 
 int cescape_char(char c, char *buf) {
@@ -542,3 +543,23 @@ char* shell_maybe_quote(const char *s, ShellEscapeFlags flags) {
 
         return str_realloc(buf);
 }
+
+char* quote_command_line(char **argv) {
+        _cleanup_free_ char *result = NULL;
+
+        assert(argv);
+
+        char **a;
+        STRV_FOREACH(a, argv) {
+                _cleanup_free_ char *t = NULL;
+
+                t = shell_maybe_quote(*a, SHELL_ESCAPE_EMPTY);
+                if (!t)
+                        return NULL;
+
+                if (!strextend_with_separator(&result, " ", t))
+                        return NULL;
+        }
+
+        return TAKE_PTR(result);
+}

src/basic/escape.h

@@ -68,3 +68,4 @@ char* escape_non_printable_full(const char *str, size_t console_width, XEscapeFl
 
 char* shell_escape(const char *s, const char *bad);
 char* shell_maybe_quote(const char *s, ShellEscapeFlags flags);
+char* quote_command_line(char **argv);