Changes from being mostly assembly to be based upon a C version.

Adds the additional error conditions for get_s: truncation
	and too small buffer.

include/stdio.c

@@ -28,18 +28,6 @@ char * gets(char * str)
 	return str;
 }
 
-char * gets_s(char * str, size_t n)
-{
-	char i = 0, t = n - 1;
-	while ((char ch = getpch()) != '\n')
-	{
-		if (i < t)
-			str[i++] = ch;
-	}
-	str[i] = 0;
-	return str;
-}
-
 char * gets_s(char * str, size_t n)
 {
 	if (str == NULL)
@@ -48,39 +36,20 @@ char* gets_s(char* str, size_t n)
 	if (n == 0 || n == 1)
 		return NULL;
 	str[0] = '\0';
-	size_t leftToStore = n - 1;
+	char i = 0, t = n - 1;
 	bool isTruncated = false;
 
-	__asm {
-		ldy #0
-
-	read_loop:
-		jsr getpch
-
-		// Check if the read in character is the line feed.
-		cmp #10
-		beq read_done
-
-		// Check to see if the maximum characters is reached.
-		ldx leftToStore
-		cpx #0
-		beq read_max
-
-		// Store the read in character & prepare for the next read.
-		sta (str), Y
-		iny
-		dec leftToStore
-		jmp read_loop
-
-	read_max:
-		ldx #1
-		stx isTruncated
-
-	read_done:
-		// Place a null character at the end of the C-string.
-		lda #0
-		sta (str), Y
+	while ((char ch = getpch()) != '\n')
+	{
+		if (i < t)
+			str[i++] = ch;
+		else
+		{
+			isTruncated = true;
+			break;
 		}
+	}
+	str[i] = 0;
 
 	if (isTruncated)
 		return NULL;

include/stdio.h

@@ -14,8 +14,6 @@ void puts(const char * str);
 char * gets(char * str);
 char* gets_s(char* str, size_t n);
 
-char * gets_s(char * str, size_t n);
-
 void printf(const char * fmt, ...);
 
 int sprintf(char * str, const char * fmt, ...);