risugen: Improve diagnostics for missing continuation character

Improve diagnostics for config files missing line continuation characters
by enforcing C-identifier rules for what is a valid instruction and
encoding name (alphanumerics plus underscore, must not start with digit).

1 files changed, 9 insertions, 0 deletions

diff --git a/risugen b/risugen
index 7f2f366..0dfafbd 100755
--- a/risugen
+++ b/risugen
@@ -531,6 +531,15 @@ sub parse_config_file($)
             print STDERR "$file:$.: no insn or encoding?\n";
             exit(1);
         }
+        if ($insn !~ /^[A-Za-z0-9][A-Za-z0-9_]*$/) {
+            print STDERR "$file:$.: invalid insn name $insn ";
+            print STDERR "(possibly missing line continuation character?)\n";
+            exit(1);
+        }
+        if ($enc !~ /^[A-Za-z0-9][A-Za-z0-9_]*$/) {
+            print STDERR "$file:$.: invalid encoding name $enc\n";
+            exit(1);
+        }
         my $insnname = "${insn} ${enc}";
         if (exists $insn_details{$insnname}) {
             print STDERR "$file:$.: redefinition of $insnname\n";