mmime: allow to relax body line length limit

Message-Id: <10e22a318b5c70d89432d85ecd8cb8ce1796a51d.1643116719.git.lucas@sexy.is>

man/mmime.1

@@ -46,6 +46,13 @@ Override Content-Type for the toplevel part.
 Defaults to
 .Sq Li multipart/mixed .
 .El
+.Sh ENVIRONMENT
+.Bl -tag -width Ds
+.It Ev MBLAZE_RELAXED_MIME
+If set,
+.Ic Nm Fl c
+will relax the body line length check and only consider bodies with lines
+longer than 998 characters need to be MIME formatted.
 .Sh EXIT STATUS
 .Ex -std
 .Sh SEE ALSO

mmime.c

@@ -517,6 +517,7 @@ check()
 	off_t linelen = 0;
 	off_t maxheadlinelen = 0;
 	off_t maxbodylinelen = 0;
+	off_t bodylinelenlimit = getenv("MBLAZE_RELAXED_MIME") ? 998 : 78;
 
 	int c;
 	int l = -1;
@@ -554,7 +555,7 @@ check()
 	}
 
 	if (bitlow == 0 && bithigh == 0 &&
-	    maxheadlinelen < 998 && maxbodylinelen <= 78 &&
+	    maxheadlinelen < 998 && maxbodylinelen <= bodylinelenlimit &&
 	    l == '\n')
 		return 0;
 	else

t/1000-mmime.t

@@ -2,7 +2,7 @@
 cd ${0%/*}
 . ./lib.sh
 
-plan 17
+plan 19
 
 cat <<EOF >tmp
 References: <aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa@a> <bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb@b> <ccccccccccccccccccccccccccccccc@c>
@@ -124,3 +124,13 @@ Subject: inclusion without further content
 EOF
 
 check 'no empty parts are generated after inclusion lines' '! mmime <tmp2 | mshow -t - | grep -q size=0'
+
+cat <<EOF >tmp2
+Subject: Strict mode
+
+Body with lines longer than 78 characters
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+EOF
+
+check 'body lines longer than 78 characters needs MIME formatting' '! mmime -c <tmp2'
+check 'MBLAZE_RELAXED_MIME allows body lines longer than 78 characters' 'MBLAZE_RELAXED_MIME= mmime -c <tmp2'