Don't treat the trailing ']' of an equivalence class expression as a

character in the set. tr -d '[=a=]' was deleting ]'s as well as a's.
Noticed by the textutils test suite.

1 files changed, 2 insertions, 1 deletions

diff --git a/usr.bin/tr/str.c b/usr.bin/tr/str.c
index 90f7335..1df43dc 100644
--- a/usr.bin/tr/str.c
+++ b/usr.bin/tr/str.c
@@ -227,10 +227,12 @@ genequiv(s)
 		s->equiv[0] = backslash(s);
 		if (*s->str != '=')
 			errx(1, "misplaced equivalence equals sign");
+		s->str += 2;
 	} else {
 		s->equiv[0] = s->str[0];
 		if (s->str[1] != '=')
 			errx(1, "misplaced equivalence equals sign");
+		s->str += 3;
 	}
 
 	/*
@@ -254,7 +256,6 @@ genequiv(s)
 		s->equiv[p] = OOBCH;
 	}
 
-	s->str += 2;
 	s->cnt = 0;
 	s->state = SET;
 	s->set = s->equiv;