/*  Pieter Suurmond, 8 mei 2012. */

#include <stdlib.h>

/* Removes leading and trailing whitespace as well as multiple spaces inside.
   Also converts tabs, newlines, etc. to spaces.
   Suitable for (destructive) in-place conversion because strings never grow.
   Returns the number of characters written to destination dst excluding the
   terminating null character. Never returns negative values. */
static int trim_whitespace(const char *src, char* dst)
{
    const char      space = ' ';
    char*           start = dst;
	unsigned char	c;           /* When c is a signed char (when you ommit 'unsigned'),
                                    this routine goes terribly wrong for ISO-LATIN encoded
                                    characters: they are then less than zero and will be skipped! */

    do  {                                   /* Skip leading whitespace.  */
        c = *src++;
        } while (c && (c <= space));
    while (c)
        {
        if (c < space)
            c = space;
        if ((c > space) || (*src > space))  /* Not a space or next not space or 0. */
            *dst++ = c;
        c = *src++;
        }
    *dst = c;  			                    /* Terminate C-string (c=0). */
    return (int)(dst - start);
}