Trim down libcompat by removing <regexp.h>.

Erwin ran an exp-run with libcompat and <regexp.h> removed. It turns out
the regexp library is almost entirely unused. In fact, it looks like it
is sometimes used by accident. Because these function names clash with
libc's <regex.h>, some application use both <regex.h> and libcompat,
which means they link against the wrong regex library.

This commit removes the regexp library and reimplements re_comp() and
re_exec() using <regex.h>. It seems the grammar of the regular
expressions accepted by these functions is similar to POSIX EREs.

After this commit, 1 low-profile port will be broken, but the maintainer
already has a patch for it sitting in his mailbox.

1 files changed, 0 insertions, 18 deletions

diff --git a/lib/libcompat/regexp/regerror.c b/lib/libcompat/regexp/regerror.c
deleted file mode 100644
index 6d0077d..0000000
--- a/lib/libcompat/regexp/regerror.c
+++ /dev/null
@@ -1,18 +0,0 @@
-#include <regexp.h>
-#include <stdio.h>
-
-void
-regerror(s)
-const char *s;
-{
-#ifdef ERRAVAIL
-	error("regexp: %s", s);
-#else
-/*
-	fprintf(stderr, "regexp(3): %s\n", s);
-	exit(1);
-*/
-	return;	  /* let std. egrep handle errors */
-#endif
-	/* NOTREACHED */
-}