mdocml: Update mandoc_hyph() to the extent that numbers on either side

[kristaps@mdocml.bsd.lv]

Log Message:
-----------
Update mandoc_hyph() to the extent that numbers on either side of the
hyphen make for a non-breakable hyphen.  Found by random testing.

Modified Files:
--------------
    mdocml:
        mandoc.c

Revision Data
-------------
Index: mandoc.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mandoc.c,v
retrieving revision 1.56
retrieving revision 1.57
diff -Lmandoc.c -Lmandoc.c -u -p -r1.56 -r1.57
--- mandoc.c
+++ mandoc.c
@@ -653,28 +653,39 @@ mandoc_eos(const char *p, size_t sz, int
 	return(found && !enclosed);
 }
 
+/*
+ * Choose whether to break at a hyphenated character (identified by the
+ * ASCII_HYPH value in the input string).
+ */
 int
 mandoc_hyph(const char *start, const char *c)
 {
+	char		l, r;
 
-	/*
-	 * Choose whether to break at a hyphenated character.  We only
-	 * do this if it's free-standing within a word.
-	 */
+	l = *(c - 1);
+	r = *(c + 1);
 
 	/* Skip first/last character of buffer. */
-	if (c == start || '\0' == *(c + 1))
+	if (c == start || '\0' == r)
 		return(0);
+
+	/* Skip a number on either side of the hyphen. */
+	if (isdigit((unsigned char)r) || isdigit((unsigned char)l))
+		return(0);
+
 	/* Skip first/last character of word. */
-	if ('\t' == *(c + 1) || '\t' == *(c - 1))
+	if ('\t' == r || '\t' == l)
 		return(0);
-	if (' ' == *(c + 1) || ' ' == *(c - 1))
+
+	if (' ' == r || ' ' == l)
 		return(0);
+
 	/* Skip double invocations. */
-	if ('-' == *(c + 1) || '-' == *(c - 1))
+	if ('-' == r || '-' == l)
 		return(0);
+
 	/* Skip escapes. */
-	if ('\\' == *(c - 1))
+	if ('\\' == l)
 		return(0);
 
 	return(1);
--
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