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CPM OPERATING SYSTEMS/CPM 86/CONCURRENT/CCPM-86 3.1 SOURCE/D6/REVERSE.C

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+
+/*----------------------------------------------------------------------*\
+ |	NAME	:  reverse						|
+ |	CREATED	:  16-August-83		LAST MODIFIED:  16-August-83	|
+ |	FUNCTION:  Reverse reverses a string in place.			|
+ |	INPUT	:  str		--  ptr to string that will be reversed.|
+ |	OUTPUT	:  Reverses string pointed to by str in place.		|
+ |		   No return value.					|
+\*----------------------------------------------------------------------*/
+
+#include	<portab.h>
+#include	"utildef.h"
+
+VOID	reverse( str )
+BYTE	str[];			/* string to reverse			*/
+{
+	WORD	head;		/* head of string index			*/
+	WORD	tail;		/* tail of string index			*/
+	WORD	cbuff;		/* current char. buffer			*/
+
+	for( head=0,tail=strlen( str )-1; head < tail; head++,tail-- )
+	{
+	   cbuff     = str[head];
+	   str[head] = str[tail];
+	   str[tail] = cbuff;
+	}
+}
+