From: Alan Cox <alan@linux.intel.com>
Date: Wed, 20 May 2015 22:37:18 +0000 (+0100)
Subject: xitoa: use our own int helper
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=d5f31fbe0b88d83756f36059ada2250e78d03acd;p=FUZIX.git

xitoa: use our own int helper

For stdio and perror using apps it costs us a small amount of memory. For stdio
using apps in general it's free, and for non stdio apps using itoa and not
sucking in the 32bit maths helpers its a big saving.
---

diff --git a/Library/libs/xitoa.c b/Library/libs/xitoa.c
index a066c10d..2c076f1d 100644
--- a/Library/libs/xitoa.c
+++ b/Library/libs/xitoa.c
@@ -1,10 +1,34 @@
 /*
- *	Internal wrapper for ltostr. Ought to go away
+ *	Internal wrapper (in theory) but used in various places it's helpful
  */
 #include <stdlib.h>
 
 /*********************** xitoa.c ***************************/
-char *_itoa(int i)
+
+/* Don't go via long - the long version is expensive on an 8bit processor and
+   can often be avoided */
+
+static char buf[7];
+
+char *_uitoa(int i)
 {
-    return _ltoa((long)i);
+	char *p = buf + sizeof(buf);
+	int c;
+
+	*--p = '\0';
+	do {
+		c = i % 10;
+		i /= 10;
+		*--p = '0' + c;
+	} while(i);
+	return p;
+}
+
+char *_itoa(int i) {
+	char *p;
+	if (i >= 0)
+		return _uitoa(i);
+	p = _uitoa(-i);
+	*--p = '-';
+	return p;
 }