all: quote string arguments in error messages

These strings are often file names or other user specified
parameters, which can give confusing errors in
the presence of unexpected characters for example.

* cfg.mk (sc_error_quotes): A new syntax check rule.
* src/*.c: Wrap error() string arguments with quote().
* tests/: Adjust accordingly.
* NEWS: Mention the improvement.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/ptx.c b/src/ptx.c
index 2ccabb734..c489301a3 100644
--- a/src/ptx.c
+++ b/src/ptx.c
@@ -2076,7 +2076,7 @@ main (int argc, char **argv)
       if (optind < argc)
         {
           if (! freopen (argv[optind], "w", stdout))
-            error (EXIT_FAILURE, errno, "%s", argv[optind]);
+            error (EXIT_FAILURE, errno, "%s", quote (argv[optind]));
           optind++;
         }