sss_utf8_tolower utility function+unit tests

5 files changed, 123 insertions, 0 deletions

diff --git a/src/util/sss_tc_utf8.c b/src/util/sss_tc_utf8.c
new file mode 100644
index 00000000..6a976211
--- /dev/null
+++ b/src/util/sss_tc_utf8.c
@@ -0,0 +1,57 @@
+/*
+    Authors:
+        Jakub Hrozek <jhrozek@redhat.com>
+
+    Copyright (C) 2011 Red Hat
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <talloc.h>
+#include "util/sss_utf8.h"
+
+char *
+sss_tc_utf8_str_tolower(TALLOC_CTX *mem_ctx, const char *s)
+{
+    size_t nlen;
+    uint8_t *ret;
+
+    ret = sss_tc_utf8_tolower(mem_ctx, (const uint8_t *) s, strlen(s), &nlen);
+    if (!ret) return NULL;
+
+    ret = talloc_realloc(mem_ctx, ret, uint8_t, nlen+1);
+    if (!ret) return NULL;
+
+    ret[nlen] = '\0';
+    return (char *) ret;
+}
+
+uint8_t *
+sss_tc_utf8_tolower(TALLOC_CTX *mem_ctx, const uint8_t *s, size_t len, size_t *_nlen)
+{
+    uint8_t *lower;
+    uint8_t *ret;
+    size_t nlen;
+
+    lower = sss_utf8_tolower(s, len, &nlen);
+    if (!lower) return NULL;
+
+    ret = talloc_memdup(mem_ctx, lower, nlen);
+    sss_utf8_free(lower);
+    if (!ret) return NULL;
+
+    *_nlen = nlen;
+    return ret;
+}
+
diff --git a/src/util/sss_utf8.c b/src/util/sss_utf8.c
index 4a98233b..7997a6df 100644
--- a/src/util/sss_utf8.c
+++ b/src/util/sss_utf8.c
@@ -24,6 +24,60 @@
 #include "sss_utf8.h"
 
 #ifdef HAVE_LIBUNISTRING
+void sss_utf8_free(void *ptr)
+{
+    return free(ptr);
+}
+#elif HAVE_GLIB2
+void sss_utf8_free(void *ptr)
+{
+    return g_free(ptr);
+}
+#else
+#error No unicode library
+#endif
+
+#ifdef HAVE_LIBUNISTRING
+uint8_t *sss_utf8_tolower(const uint8_t *s, size_t len, size_t *_nlen)
+{
+    size_t llen;
+    uint8_t *lower;
+
+    lower = u8_tolower(s, len, NULL, NULL, NULL, &llen);
+    if (!lower) return NULL;
+
+    if (_nlen) *_nlen = llen;
+    return lower;
+}
+#elif HAVE_GLIB2
+uint8_t *sss_utf8_tolower(const uint8_t *s, size_t len, size_t *_nlen)
+{
+    gchar *glower;
+    size_t nlen;
+    uint8_t *lower;
+
+    glower = g_utf8_strdown((const gchar *) s, len);
+    if (!glower) return NULL;
+
+    /* strlen() is safe here because g_utf8_strdown() always null-terminates */
+    nlen = strlen(glower);
+
+    lower = g_malloc(nlen);
+    if (!lower) {
+        g_free(glower);
+        return NULL;
+    }
+
+    memcpy(lower, glower, nlen);
+    g_free(glower);
+    if (_nlen) *_nlen = nlen;
+    return (uint8_t *) lower;
+}
+#else
+#error No unicode library
+#endif
+
+#ifdef HAVE_LIBUNISTRING
 bool sss_utf8_check(const uint8_t *s, size_t n)
 {
     if (u8_check(s, n) == NULL) {
diff --git a/src/util/sss_utf8.h b/src/util/sss_utf8.h
index 37dcff95..b7da7621 100644
--- a/src/util/sss_utf8.h
+++ b/src/util/sss_utf8.h
@@ -35,6 +35,11 @@
 #define ENOMATCH -1
 #endif
 
+void sss_utf8_free(void *ptr);
+
+/* The result must be freed with sss_utf8_free() */
+uint8_t *sss_utf8_tolower(const uint8_t *s, size_t len, size_t *nlen);
+
 bool sss_utf8_check(const uint8_t *s, size_t n);
 
 errno_t sss_utf8_case_eq(const uint8_t *s1, const uint8_t *s2);
diff --git a/src/util/util.c b/src/util/util.c
index b4b1b124..f525c915 100644
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -23,6 +23,7 @@
 
 #include "talloc.h"
 #include "util/util.h"
+#include "util/sss_utf8.h"
 #include "dhash.h"
 
 /* split a string into an allocated array of strings.
diff --git a/src/util/util.h b/src/util/util.h
index 9a006471..4ff112b7 100644
--- a/src/util/util.h
+++ b/src/util/util.h
@@ -502,4 +502,10 @@ errno_t sss_filter_sanitize(TALLOC_CTX *mem_ctx,
 char *
 sss_escape_ip_address(TALLOC_CTX *mem_ctx, int family, const char *addr);
 
+/* from sss_tc_utf8.c */
+char *
+sss_tc_utf8_str_tolower(TALLOC_CTX *mem_ctx, const char *s);
+uint8_t *
+sss_tc_utf8_tolower(TALLOC_CTX *mem_ctx, const uint8_t *s, size_t len, size_t *_nlen);
+
 #endif /* __SSSD_UTIL_H__ */