Libc-498.tar.gz

[apple/libc.git] / stdio / fgetwc-fbsd.c

diff --git a/stdio/fgetwc-fbsd.c b/stdio/fgetwc-fbsd.c
new file mode 100644 (file)
index 0000000..af3dd5f
--- /dev/null
+++ b/stdio/fgetwc-fbsd.c
@@ -0,0 +1,114 @@
+/*-
+ * Copyright (c) 2002-2004 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/stdio/fgetwc.c,v 1.12 2004/07/20 08:27:27 tjr Exp $");
+
+#include "xlocale_private.h"
+
+#include "namespace.h"
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <wchar.h>
+#include "un-namespace.h"
+#include "libc_private.h"
+#include "local.h"
+#include "mblocal.h"
+
+/*
+ * MT-safe version.
+ */
+wint_t
+fgetwc(FILE *fp)
+{
+       wint_t r;
+
+       FLOCKFILE(fp);
+       ORIENT(fp, 1);
+       r = __fgetwc(fp, __current_locale());
+       FUNLOCKFILE(fp);
+
+       return (r);
+}
+
+wint_t
+fgetwc_l(FILE *fp, locale_t loc)
+{
+       wint_t r;
+
+       NORMALIZE_LOCALE(loc);
+       FLOCKFILE(fp);
+       ORIENT(fp, 1);
+       r = __fgetwc(fp, loc);
+       FUNLOCKFILE(fp);
+
+       return (r);
+}
+
+/*
+ * Non-MT-safe version.
+ */
+wint_t
+__fgetwc(FILE *fp, locale_t loc)
+{
+       wchar_t wc;
+       size_t nconv;
+       struct __xlocale_st_runelocale *xrl = loc->__lc_ctype;
+       size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict, size_t, mbstate_t * __restrict, locale_t) = xrl->__mbrtowc;
+
+       if (fp->_r <= 0 && __srefill(fp))
+               return (WEOF);
+       if (xrl->__mb_cur_max == 1) {
+               /* Fast path for single-byte encodings. */
+               wc = *fp->_p++;
+               fp->_r--;
+               return (wc);
+       }
+       do {
+               nconv = __mbrtowc(&wc, fp->_p, fp->_r, &fp->_extra->mbstate, loc);
+               if (nconv == (size_t)-1)
+                       break;
+               else if (nconv == (size_t)-2)
+                       continue;
+               else if (nconv == 0) {
+                       /*
+                        * Assume that the only valid representation of
+                        * the null wide character is a single null byte.
+                        */
+                       fp->_p++;
+                       fp->_r--;
+                       return (L'\0');
+               } else {
+                       fp->_p += nconv;
+                       fp->_r -= nconv;
+                       return (wc);
+               }
+       } while (__srefill(fp) == 0);
+       fp->_flags |= __SERR;
+       errno = EILSEQ;
+       return (WEOF);
+}