Libc-498.tar.gz

[apple/libc.git] / locale / wcstod-fbsd.c

diff --git a/locale/wcstod-fbsd.c b/locale/wcstod-fbsd.c
new file mode 100644 (file)
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+++ b/locale/wcstod-fbsd.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/locale/wcstod.c,v 1.4 2004/04/07 09:47:56 tjr Exp $");
+
+#include "xlocale_private.h"
+
+#include <stdlib.h>
+#include <wchar.h>
+#include <wctype.h>
+#include <_simple.h>
+
+/*
+ * Convert a string to a double-precision number.
+ *
+ * This is the wide-character counterpart of strtod(). So that we do not
+ * have to duplicate the code of strtod() here, we convert the supplied
+ * wide character string to multibyte and call strtod() on the result.
+ * This assumes that the multibyte encoding is compatible with ASCII
+ * for at least the digits, radix character and letters.
+ */
+double
+wcstod_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
+    locale_t loc)
+{
+       static const mbstate_t initial;
+       mbstate_t mbs;
+       double val;
+       char *buf, *end;
+       size_t len;
+       locale_t ctype;
+       _SIMPLE_STRING b;
+       char mb[MB_CUR_MAX + 1];
+       const wchar_t *nptr0 = nptr;
+       const wchar_t *first;
+
+       NORMALIZE_LOCALE(loc);
+       ctype = __numeric_ctype(loc);
+
+       while (iswspace_l(*nptr, ctype))
+               nptr++;
+
+       if ((b = _simple_salloc()) == NULL)
+               return (0.0);
+
+       first = nptr;
+       mbs = initial;
+       while (*nptr && (len = wcrtomb_l(mb, *nptr, &mbs, ctype)) != (size_t)-1) {
+               mb[len] = 0;
+               if (_simple_sappend(b, mb) < 0) { /* no memory */
+                       _simple_sfree(b);
+                       return (0.0);
+               }
+               nptr++;
+       }
+
+       /* Let strtod() do most of the work for us. */
+       buf = _simple_string(b);
+       val = strtod_l(buf, &end, loc);
+
+       /*
+        * We only know where the number ended in the _multibyte_
+        * representation of the string. If the caller wants to know
+        * where it ended, count multibyte characters to find the
+        * corresponding position in the wide char string.
+        */
+       if (endptr != NULL)
+               /* XXX Assume each wide char is one byte. */
+               *endptr = (end == buf) ? (wchar_t *)nptr0 : ((wchar_t *)first + (end - buf));
+
+       _simple_sfree(b);
+
+       return (val);
+}
+
+double
+wcstod(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
+{
+       return wcstod_l(nptr, endptr, __current_locale());
+}