Implement a simple, consistent user interface for error handling.

We now have sufficient practical experience to know what we want,
so this is intended to be final:
- provide -Wlevel (warning, error or fatal) to select what you care about
- provide -Wstop to stop after parsing a file with warnings you care about
- provide consistent exit status codes for those warnings you care about
- fully document what warnings, errors and fatal errors mean
- remove all other cruft from the user interface, less is more:
- remove all -f knobs along with the whole -f option
- remove the old -Werror because calling warnings "fatal" is silly
- always finish parsing each file, unless fatal errors prevent that
This commit also includes a couple of related simplifications behind
the scenes regarding error handling.
Feedback and OK  kristaps@;  Joerg Sonnenberger (NetBSD) and
Sascha Wildner (DragonFly BSD) agree with the general direction.

1 files changed, 2 insertions, 2 deletions

diff --git a/html.c b/html.c
index 8ec167e5..8f0b2d65 100644
--- a/html.c
+++ b/html.c
@@ -116,7 +116,7 @@ ml_alloc(char *outopts, enum htmltype type)
 	h = calloc(1, sizeof(struct html));
 	if (NULL == h) {
 		perror(NULL);
-		exit(EXIT_FAILURE);
+		exit(MANDOCLEVEL_SYSERR);
 	}
 
 	h->type = type;
@@ -398,7 +398,7 @@ print_otag(struct html *h, enum htmltag tag,
 		t = malloc(sizeof(struct tag));
 		if (NULL == t) {
 			perror(NULL);
-			exit(EXIT_FAILURE);
+			exit(MANDOCLEVEL_SYSERR);
 		}
 		t->tag = tag;
 		t->next = h->tags.head;