string trim functions

#include <ctype.h>
#include <string.h>
 
/*
    Public domain implementations of in-place string trim functions
    
    Michael Burr
    [email protected]
    2010
*/
 
char* ltrim(char* s) 
{
    char* newstart = s;
 
    while (isspace( *newstart)) {
        ++newstart;
    }
 
    // newstart points to first non-whitespace char (which might be '\0')
    memmove( s, newstart, strlen( newstart) + 1); // don't forget to move the '\0' terminator
 
    return s;
}
 
 
char* rtrim( char* s)
{
    char* end = s + strlen( s);
 
    // find the last non-whitespace character
    while ((end != s) && isspace( *(end-1))) {
            --end;
    }
 
    // at this point either (end == s) and s is either empty or all whitespace
    //      so it needs to be made empty, or
    //      end points just past the last non-whitespace character (it might point
    //      at the '\0' terminator, in which case there's no problem writing
    //      another there).    
    *end = '\0';
 
    return s;
}
 
char*  trim( char* s)
{
    return rtrim( ltrim( s));
}