From 9e8f3053cb56875bdd5a8dce0a74976a70a8080a Mon Sep 17 00:00:00 2001
From: Stig Venaas <venaas@openldap.org>
Date: Wed, 20 Feb 2002 15:51:10 +0000
Subject: [PATCH] Added UTF8bvnormcmp(), should replace UTF8normcmp()

---
 include/ldap_pvt_uc.h         |   5 ++
 libraries/liblunicode/ucstr.c | 129 ++++++++++++++++++++++++++++++++++
 2 files changed, 134 insertions(+)

diff --git a/include/ldap_pvt_uc.h b/include/ldap_pvt_uc.h
index fb3b29b5a0..6778628fa6 100644
--- a/include/ldap_pvt_uc.h
+++ b/include/ldap_pvt_uc.h
@@ -154,6 +154,11 @@ LDAP_LUNICODE_F(int) UTF8normcmp(
 	const char *,
 	unsigned );
 
+LDAP_LUNICODE_F(int) UTF8bvnormcmp(
+	struct berval *,
+	struct berval *,
+	unsigned );
+
 LDAP_END_DECL
 
 #endif
diff --git a/libraries/liblunicode/ucstr.c b/libraries/liblunicode/ucstr.c
index d0d7621439..395bd6b950 100644
--- a/libraries/liblunicode/ucstr.c
+++ b/libraries/liblunicode/ucstr.c
@@ -498,3 +498,132 @@ int UTF8normcmp(
 	}
 	return l1 > l2 ? 1 : -1;
 }
+
+/* compare UTF8-strings, optionally ignore casing */
+/* slow, should be optimized */
+int UTF8bvnormcmp(
+	struct berval *bv1,
+	struct berval *bv2,
+	unsigned casefold )
+{
+	int i, l1, l2, len, ulen, res;
+	char *s1, *s2, *done;
+	unsigned long *ucs, *ucsout1, *ucsout2;
+
+	if (bv1 == NULL) {
+		return bv2 == NULL ? 0 : -1;
+	} else if (bv2 == NULL) {
+		return 1;
+	}
+
+	l1 = bv1->bv_len;
+	l2 = bv2->bv_len;
+
+	len = (l1 < l2) ? l1 : l2;
+	if (len == 0) {
+		return l1 == 0 ? (l2 == 0 ? 0 : -1) : 1;
+	}
+
+	s1 = bv1->bv_val;
+	s2 = bv2->bv_val;
+	done = s1 + len;
+
+	while ( (s1 < done) && LDAP_UTF8_ISASCII(s1) && LDAP_UTF8_ISASCII(s2) ) {
+		if (casefold) {
+			char c1 = TOUPPER(*s1);
+			char c2 = TOUPPER(*s2);
+		    	res = c1 - c2;
+		} else {
+			res = *s1 - *s2;
+		}			
+		s1++;
+		s2++;
+		if (res) {
+			/* done unless next character in s1 or s2 is non-ascii */
+			if (s1 < done) {
+				if (!LDAP_UTF8_ISASCII(s1) || !LDAP_UTF8_ISASCII(s2)) {
+					break;
+				}
+			} else if ((len < l1) && !LDAP_UTF8_ISASCII(s1) ||
+				   (len < l2) && !LDAP_UTF8_ISASCII(s2)) {
+				break;
+			}
+			return res;
+		}
+	}
+
+	/* We have encountered non-ascii or strings equal up to len */
+
+	/* set i to number of iterations */
+	i = s1 - done + len;
+	/* passed through loop at least once? */
+	if (i > 0) {
+		if (!res && (s1 == done) &&
+		    ((len == l1) || LDAP_UTF8_ISASCII(s1)) &&
+		    ((len == l2) || LDAP_UTF8_ISASCII(s2))) {
+			/* all ascii and equal up to len */
+			return l1 - l2;
+		}
+
+		/* rewind one char, and do normalized compare from there */
+		s1--;
+		s2--;
+		l1 -= i - 1;
+		l2 -= i - 1;
+	}
+			
+	/* FIXME: Should first check to see if strings are already in
+	 * proper normalized form.
+	 */
+
+	ucs = (long *) malloc( ( l1 > l2 ? l1 : l2 ) * sizeof(*ucs) );
+	if ( ucs == NULL ) {
+		return l1 > l2 ? 1 : -1; /* what to do??? */
+	}
+	
+	/*
+	 * XXYYZ: we convert to ucs4 even though -llunicode
+	 * expects ucs2 in an unsigned long
+	 */
+	
+	/* convert and normalize 1st string */
+	for ( i = 0, ulen = 0; i < l1; i += len, ulen++ ) {
+                ucs[ulen] = ldap_x_utf8_to_ucs4( s1 + i );
+                if ( ucs[ulen] == LDAP_UCS4_INVALID ) {
+			free( ucs );
+                        return -1; /* what to do??? */
+                }
+		len = LDAP_UTF8_CHARLEN( s1 + i );
+	}
+	uccanondecomp( ucs, ulen, &ucsout1, &l1 );
+	l1 = uccanoncomp( ucsout1, l1 );
+
+	/* convert and normalize 2nd string */
+	for ( i = 0, ulen = 0; i < l2; i += len, ulen++ ) {
+                ucs[ulen] = ldap_x_utf8_to_ucs4( s2 + i );
+                if ( ucs[ulen] == LDAP_UCS4_INVALID ) {
+			free( ucsout1 );
+			free( ucs );
+                        return 1; /* what to do??? */
+                }
+		len = LDAP_UTF8_CHARLEN( s2 + i );
+	}
+	uccanondecomp( ucs, ulen, &ucsout2, &l2 );
+	l2 = uccanoncomp( ucsout2, l2 );
+
+	free( ucs );
+
+	res = casefold
+		? ucstrncasecmp( ucsout1, ucsout2, l1 < l2 ? l1 : l2 )
+		: ucstrncmp( ucsout1, ucsout2, l1 < l2 ? l1 : l2 );
+	free( ucsout1 );
+	free( ucsout2 );
+
+	if ( res != 0 ) {
+		return res;
+	}
+	if ( l1 == l2 ) {
+		return 0;
+	}
+	return l1 > l2 ? 1 : -1;
+}
-- 
2.39.5