[libc] Add strtoull()

Don't implement strtoul() on top of strtoull() as strtoull() is much
bigger and only used on linux currently. Instead refactor most of the
logic out of strtoul() into static inlines and reuse that. Also put it
in a separate object so it won't get linked in.

Signed-off-by: Piotr Jaroszyński <p.jaroszynski@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/core/misc.c

@@ -37,30 +37,10 @@ unsigned long strtoul ( const char *p, char **endp, int base ) {
 	unsigned long ret = 0;
 	unsigned int charval;
 
-	while ( isspace ( *p ) )
-		p++;
-
-	if ( base == 0 ) {
-		base = 10;
-		if ( *p == '0' ) {
-			p++;
-			base = 8;
-			if ( ( *p | 0x20 ) == 'x' ) {
-				p++;
-				base = 16;
-			}
-		}
-	}
+	base = strtoul_base ( &p, base );
 
 	while ( 1 ) {
-		charval = *p;
-		if ( charval >= 'a' ) {
-			charval = ( charval - 'a' + 10 );
-		} else if ( charval >= 'A' ) {
-			charval = ( charval - 'A' + 10 );
-		} else if ( charval <= '9' ) {
-			charval = ( charval - '0' );
-		}
+		charval = strtoul_charval ( *p );
 		if ( charval >= ( unsigned int ) base )
 			break;
 		ret = ( ( ret * base ) + charval );

src/core/strtoull.c

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>
+ * Copyright (C) 2010 Piotr Jaroszyński <p.jaroszynski@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdlib.h>
+#include <ctype.h>
+
+/*
+ * Despite being exactly the same as strtoul() except the long long instead of
+ * long it ends up being much bigger so provide a separate implementation in a
+ * separate object so that it won't be linked in if not used.
+ */
+unsigned long long strtoull ( const char *p, char **endp, int base ) {
+	unsigned long long ret = 0;
+	unsigned int charval;
+
+	base = strtoul_base ( &p, base );
+
+	while ( 1 ) {
+		charval = strtoul_charval ( *p );
+		if ( charval >= ( unsigned int ) base )
+			break;
+		ret = ( ( ret * base ) + charval );
+		p++;
+	}
+
+	if ( endp )
+		*endp = ( char * ) p;
+
+	return ( ret );
+}

src/include/stdlib.h

@@ -5,6 +5,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 
 #include <stdint.h>
 #include <assert.h>
+#include <ctype.h>
 
 /*****************************************************************************
  *
@@ -13,7 +14,46 @@ FILE_LICENCE ( GPL2_OR_LATER );
  ****************************************************************************
  */
 
+static inline int strtoul_base ( const char **pp, int base )
+{
+	const char *p = *pp;
+
+	while ( isspace ( *p ) )
+		p++;
+
+	if ( base == 0 ) {
+		base = 10;
+		if ( *p == '0' ) {
+			p++;
+			base = 8;
+			if ( ( *p | 0x20 ) == 'x' ) {
+				p++;
+				base = 16;
+			}
+		}
+	}
+
+	*pp = p;
+
+	return base;
+}
+
+static inline unsigned int strtoul_charval ( unsigned int charval )
+{
+	if ( charval >= 'a' ) {
+		charval = ( charval - 'a' + 10 );
+	} else if ( charval >= 'A' ) {
+		charval = ( charval - 'A' + 10 );
+	} else if ( charval <= '9' ) {
+		charval = ( charval - '0' );
+	}
+
+	return charval;
+}
+
 extern unsigned long strtoul ( const char *p, char **endp, int base );
+extern unsigned long long strtoull ( const char *p, char **endp, int base );
+
 
 /*****************************************************************************
  *