Split the -Werror message level into -Werror (broken manual, probably

using mandoc is better than using groff) and -Wunsupp (manual using
unsupported low-level roff(7) feature, probably using groff is better
than using mandoc).  Once this feature is complete, it is intended
to help porting, making the decision whether to USE_GROFF easier.

As a first step, distinguish four classes of roff(7) requests:
1. Supported (currently 24 requests)
2. Currently ignored because unimportant (120)  ->  no message
3. Ignored for good because insecure (14)  ->  -Werror
4. Currently unsupported (68)  ->  these trigger the new -Wunsupp messages

1 files changed, 12 insertions, 8 deletions

diff --git a/read.c b/read.c
index 7ff77224..42aaca7d 100644
--- a/read.c
+++ b/read.c
@@ -80,7 +80,7 @@ static	const enum mandocerr	mandoclimits[MANDOCLEVEL_MAX] = {
 	MANDOCERR_WARNING,
 	MANDOCERR_WARNING,
 	MANDOCERR_ERROR,
-	MANDOCERR_MAX,
+	MANDOCERR_UNSUPP,
 	MANDOCERR_MAX,
 	MANDOCERR_MAX
 };
@@ -180,22 +180,18 @@ static	const char * const	mandocerrs[MANDOCERR_MAX] = {
 	"unexpected end of equation",
 
 	/* related to tables */
-	"bad table syntax",
-	"bad table option",
-	"bad table layout",
 	"no table layout cells specified",
 	"no table data cells specified",
 	"ignore data in cell",
 	"data block still open",
 	"ignoring extra data cells",
-	"ignoring macro in table",
 
 	/* related to document structure and macros */
 	NULL,
-	"input too large",
 	"input stack limit exceeded, infinite loop?",
 	"skipping bad character",
 	"skipping unknown macro",
+	"skipping insecure request",
 	"skipping item outside list",
 	"skipping column outside column list",
 	"skipping end of block that is not open",
@@ -216,6 +212,14 @@ static	const char * const	mandocerrs[MANDOCERR_MAX] = {
 	"skipping all arguments",
 	"skipping excess arguments",
 	"divide by zero",
+
+	"unsupported feature",
+	"input too large",
+	"unsupported roff request",
+	"unsupported table syntax",
+	"unsupported table option",
+	"unsupported table layout",
+	"ignoring macro in table",
 };
 
 static	const char * const	mandoclevels[MANDOCLEVEL_MAX] = {
@@ -223,7 +227,7 @@ static	const char * const	mandoclevels[MANDOCLEVEL_MAX] = {
 	"RESERVED",
 	"WARNING",
 	"ERROR",
-	"FATAL",
+	"UNSUPP",
 	"BADARG",
 	"SYSERR"
 };
@@ -958,7 +962,7 @@ mandoc_msg(enum mandocerr er, struct mparse *m,
 {
 	enum mandoclevel level;
 
-	level = MANDOCLEVEL_ERROR;
+	level = MANDOCLEVEL_UNSUPP;
 	while (er < mandoclimits[level])
 		level--;