Libc-320.tar.gz

[apple/libc.git] / string / FreeBSD / wcscoll.c

diff --git a/string/FreeBSD/wcscoll.c b/string/FreeBSD/wcscoll.c
new file mode 100644 (file)
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+++ b/string/FreeBSD/wcscoll.c
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+/*-
+ * Copyright (c) 2002 Tim J. Robbins
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/libc/string/wcscoll.c,v 1.1 2002/10/04 03:18:26 tjr Exp $");
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+#include "collate.h"
+
+static char *__mbsdup(const wchar_t *);
+
+/*
+ * Placeholder implementation of wcscoll(). Attempts to use the single-byte
+ * collation ordering where possible, and falls back on wcscmp() in locales
+ * with extended character sets.
+ */
+int
+wcscoll(const wchar_t *ws1, const wchar_t *ws2)
+{
+       char *mbs1, *mbs2;
+       int diff, sverrno;
+
+       if (__collate_load_error || MB_CUR_MAX > 1)
+               /*
+                * Locale has no special collating order, could not be
+                * loaded, or has an extended character set; do a fast binary
+                * comparison.
+                */
+               return (wcscmp(ws1, ws2));
+
+       if ((mbs1 = __mbsdup(ws1)) == NULL || (mbs2 = __mbsdup(ws2)) == NULL) {
+               /*
+                * Out of memory or illegal wide chars; fall back to wcscmp()
+                * but leave errno indicating the error. Callers that don't
+                * check for error will get a reasonable but often slightly
+                * incorrect result.
+                */
+               sverrno = errno;
+               free(mbs1);
+               errno = sverrno;
+               return (wcscmp(ws1, ws2));
+       }
+
+       diff = strcoll(mbs1, mbs2);
+       sverrno = errno;
+       free(mbs1);
+       free(mbs2);
+       errno = sverrno;
+
+       return (diff);
+}
+
+static char *
+__mbsdup(const wchar_t *ws)
+{
+       mbstate_t state;
+       const wchar_t *wcp;
+       size_t len;
+       char *mbs;
+
+       memset(&state, 0, sizeof(state));
+       wcp = ws;
+       if ((len = wcsrtombs(NULL, &wcp, 0, &state)) == (size_t)-1)
+               return (NULL);
+       if ((mbs = malloc(len + 1)) == NULL)
+               return (NULL);
+       memset(&state, 0, sizeof(state));
+       wcsrtombs(mbs, &ws, len + 1, &state);
+
+       return (mbs);
+}