memset.c

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 Copyright (c) 2017 Walt Elam
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/***************************************************************************//**
 @file memset.c
 
 @brief Defines the memset function
*******************************************************************************/
#include <string.h>
 
/*******************************************************************************
 memset
*//**
 @brief Copies the value c into the first n characters of object s
 @param *s Destination object having its memory set
 @param c Value being written
 @param n Number of characters to be set
 
 The memset function copies the value c (converted to an unsigned char) into
 each of the first n characters of the object pointed to by s.
 
 @return The value of s
*******************************************************************************/
void *
memset(void *s, int c, size_t n)
{
 unsigned char *pChar = s;
 
 if ( !s ||
 /* Check for wrapping */
 ((((unsigned long) -1) - ((unsigned long) s)) < n))
 {
 return s;
 }
 
 while (0 < n--)
 {
 *(pChar++) = (unsigned char) c;
 }
 
 return s;
}