Libc-320.tar.gz

[apple/libc.git] / locale / FreeBSD / wcstold.c

diff --git a/locale/FreeBSD/wcstold.c b/locale/FreeBSD/wcstold.c
new file mode 100644 (file)
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+++ b/locale/FreeBSD/wcstold.c
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+/*-
+ * Copyright (c) 2002, 2003 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/wcstold.c,v 1.1 2003/03/13 06:29:53 tjr Exp $");
+
+#include <stdlib.h>
+#include <wchar.h>
+#include <wctype.h>
+
+/*
+ * See wcstod() for comments as to the logic used.
+ */
+long double
+wcstold(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
+{
+       static const mbstate_t initial;
+       mbstate_t state;
+       long double val;
+       char *buf, *end, *p;
+       const wchar_t *wcp;
+       size_t clen, len;
+
+       while (iswspace(*nptr))
+               nptr++;
+
+       state = initial;
+       wcp = nptr;
+       if ((len = wcsrtombs(NULL, &wcp, 0, &state)) == (size_t)-1) {
+               if (endptr != NULL)
+                       *endptr = (wchar_t *)nptr;
+               return (0.0);
+       }
+       if ((buf = malloc(len + 1)) == NULL)
+               return (0.0);
+       state = initial;
+       wcsrtombs(buf, &wcp, len + 1, &state);
+
+       val = strtold(buf, &end);
+
+       if (endptr != NULL) {
+#if 1                                  /* Fast, assume 1:1 WC:MBS mapping. */
+               *endptr = (wchar_t *)nptr + (end - buf);
+               (void)clen;
+               (void)p;
+#else                                  /* Slow, conservative approach. */
+               state = initial;
+               *endptr = (wchar_t *)nptr;
+               p = buf;
+               while (p < end &&
+                   (clen = mbrlen(p, end - p, &state)) > 0) {
+                       p += clen;
+                       (*endptr)++;
+               }
+#endif
+       }
+
+       free(buf);
+
+       return (val);
+}