Geografic-Information-System/lib/gis/ascii_chk.c

/**
 * \file ascii_chk.c
 *
 * \brief GIS Library - Remove non-ascii characters
 *
 * (C) 2001-2008 by the GRASS Development Team
 *
 * This program is free software under the GNU General Public License
 * (>=v2). Read the file COPYING that comes with GRASS for details.
 *
 * \author GRASS GIS Development Team
 *
 * \date 1999-2008
 */

#include <grass/gis.h>


#define TAB	011
#define SPACE	040


/**
 * \brief Removes non-ascii characters from buffer.
 *
 * Updates <b>string</b> with non_ascii characters removed, except for 
 * tabs, which are turned into spaces.
 *
 * \param[in,out] string buffer to have non-ascii characters removed
 * \return always returns 0
 */

int G_ascii_check(char *string)
{
    char *ptr1, *ptr2;

    ptr1 = string;
    ptr2 = string;

    while (*ptr1) {
	if ((*ptr1 >= 040) && (*ptr1 <= 0176))
	    *ptr2++ = *ptr1;
	else if (*ptr1 == TAB)
	    *ptr2++ = SPACE;
	ptr1++;
    }
    *ptr2 = 0;

    return 0;
}