[PATCH 5/7] Importing strtoumax inttypes methods from FreeBSD.

[Aditya Upadhyay <aadit0402 at gmail dot com>]

---
 newlib/libc/stdlib/Makefile.am |   1 +
 newlib/libc/stdlib/strtoumax.c | 138 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 139 insertions(+)
 create mode 100644 newlib/libc/stdlib/strtoumax.c

diff --git a/newlib/libc/stdlib/Makefile.am b/newlib/libc/stdlib/Makefile.am
index 6cca5f005..c51f51f7f 100644
--- a/newlib/libc/stdlib/Makefile.am
+++ b/newlib/libc/stdlib/Makefile.am
@@ -63,6 +63,7 @@ GENERAL_SOURCES = \
 	strtol.c	\
 	strtorx.c	\
 	strtoul.c	\
+	strtoumax.c	\
 	utoa.c          \
 	wcstod.c	\
 	wcstol.c	\
diff --git a/newlib/libc/stdlib/strtoumax.c b/newlib/libc/stdlib/strtoumax.c
new file mode 100644
index 000000000..240a6afed
--- /dev/null
+++ b/newlib/libc/stdlib/strtoumax.c
@@ -0,0 +1,138 @@
+/*-
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Copyright (c) 2011 The FreeBSD Foundation
+ * All rights reserved.
+ * Portions of this software were developed by David Chisnall
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "from @(#)strtoul.c	8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: head/lib/libc/stdlib/strtoumax.c 251672 2013-06-13 00:19:30Z emaste $");
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <reent.h>
+#include "../locale/setlocale.h"
+
+/*
+ * Convert a string to a uintmax_t integer.
+ *
+ * Assumes that the upper and lower case
+ * alphabets and digits are each contiguous.
+ */
+
+/*
+ *Reentrant version of strtoumax.
+ */
+uintmax_t
+_strtoumax_r(struct _reent *rptr, const char * __restrict nptr, 
+	     char ** __restrict endptr, int base, locale_t loc)
+{
+	const char *s = (const unsigned char *)nptr;
+	uintmax_t acc;
+	char c;
+	uintmax_t cutoff;
+	int neg = 0, any, cutlim;
+	
+	/*
+	 * See strtoimax for comments as to the logic used.
+	 */
+	do {
+		c = *s++;
+	} while (isspace_l(c, loc));
+	if (c == '-') {
+		neg = 1;
+		c = *s++;
+	} else {
+		neg = 0;
+		if (c == '+')
+			c = *s++;
+	}
+	if ((base == 0 || base == 16) &&
+	    c == '0' && (*s == 'x' || *s == 'X')) {
+		c = s[1];
+		s += 2;
+		base = 16;
+	}
+	if (base == 0)
+		base = c == '0' ? 8 : 10;
+	acc = any = 0;
+	if (base < 2 || base > 36)
+		goto noconv;
+
+	cutoff = UINTMAX_MAX / base;
+	cutlim = UINTMAX_MAX % base;
+	for ( ; ; c = *s++) {
+		if (c >= '0' && c <= '9')
+			c -= '0';
+		else if (c >= 'A' && c <= 'Z')
+			c -= 'A' - 10;
+		else if (c >= 'a' && c <= 'z')
+			c -= 'a' - 10;
+		else
+			break;
+		if (c >= base)
+			break;
+		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
+			any = -1;
+		else {
+			any = 1;
+			acc *= base;
+			acc += c;
+		}
+	}
+	if (any < 0) {
+		acc = UINTMAX_MAX;
+		rptr->_errno = ERANGE;
+	} else if (!any) {
+noconv:
+		rptr->_errno = EINVAL;
+	} else if (neg)
+		acc = -acc;
+	if (endptr != NULL)
+		*endptr = (char *)(any ? s - 1 : nptr);
+	return (acc);
+}
+uintmax_t
+strtoumax_l(const char * __restrict nptr, char ** __restrict endptr, int base,
+	    locale_t loc)
+{
+	return _strtoumax_r(_REENT, nptr, endptr, base, loc);
+}
+uintmax_t
+strtoumax(const char* __restrict nptr, char** __restrict endptr, int base)
+{
+	return _strtoumax_r(_REENT, nptr, endptr, base, __get_current_locale());
+}
-- 
2.13.0