sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 94 insertions, 0 deletions

diff --git a/device/lib/pic16/libc/stdlib/atof.c b/device/lib/pic16/libc/stdlib/atof.c
new file mode 100644
index 0000000..956eeed
--- /dev/null
+++ b/device/lib/pic16/libc/stdlib/atof.c
@@ -0,0 +1,94 @@
+/*-------------------------------------------------------------------------
+   atof.c - converts an ASCII string to float
+
+   Copyright (C) 2003, Jesus Calvino-Fraga <jesusc at ieee.org>
+
+   This library 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, or (at your option) any
+   later version.
+
+   This library 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 library; see the file COPYING. If not, write to the
+   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA.
+
+   As a special exception, if you link this library with other files,
+   some of which are compiled with SDCC, to produce an executable,
+   this library does not by itself cause the resulting executable to
+   be covered by the GNU General Public License. This exception does
+   not however invalidate any other reasons why the executable file
+   might be covered by the GNU General Public License.
+-------------------------------------------------------------------------*/
+
+#include <ctype.h>
+#include <stdlib.h>
+
+float atof(char * s)
+{
+	float value, fraction;
+	signed char iexp;
+	char sign;
+
+	//Skip leading blanks
+	while (isspace(*s)) s++;
+
+	//Get the sign
+	if (*s == '-')
+	{
+		sign=1;
+		s++;
+	}
+	else
+	{
+		sign=0;
+		if (*s == '+') s++;
+	}
+
+	//Get the integer part
+	for (value=0.0; isdigit(*s); s++)
+	{
+		value=10.0*value+(*s-'0');
+	}
+
+	//Get the fraction
+	if (*s == '.')
+	{
+		s++;
+		for (fraction=0.1; isdigit(*s); s++)
+		{
+			value+=(*s-'0')*fraction;
+			fraction*=0.1;
+		}
+	}
+
+	//Finally, the exponent (not very efficient, but enough for now*/
+	if (toupper(*s)=='E')
+	{
+		s++;
+		iexp=(signed char)atoi(s);
+		{
+			while(iexp!=0)
+			{
+				if(iexp<0)
+				{
+					value*=0.1;
+					iexp++;
+				}
+				else
+				{
+					value*=10.0;
+					iexp--;
+				}
+			}
+		}
+	}
+
+	if(sign) value*=-1.0;
+	return (value);
+}