/*
* (c) 2004 by Kalle Wallin <kaw@linux.se>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "hscroll.h"
#include "charset.h"
#include <assert.h>
#include <ctype.h>
#include <string.h>
// FIXME: utf-8 length
char *
strscroll(char *str, char *separator, int width, scroll_state_t *st)
{
gchar *tmp, *buf;
gsize len, size;
assert(str != NULL);
assert(separator != NULL);
assert(st != NULL);
if( st->offset==0 ) {
st->offset++;
return g_strdup(str);
}
/* create a buffer containing the string and the separator */
size = strlen(str)+strlen(separator)+1;
tmp = g_malloc(size);
g_strlcpy(tmp, str, size);
g_strlcat(tmp, separator, size);
len = utf8_width(tmp);
if (st->offset >= len)
st->offset = 0;
/* create the new scrolled string */
size = width+1;
if (g_utf8_validate(tmp, -1, NULL) ) {
int ulen;
buf = g_malloc(size*6);// max length of utf8 char is 6
g_utf8_strncpy(buf, g_utf8_offset_to_pointer(tmp,st->offset), size);
if( (ulen = g_utf8_strlen(buf, -1)) < width )
g_utf8_strncpy(buf+strlen(buf), tmp, size - ulen - 1);
} else {
buf = g_malloc(size);
g_strlcpy(buf, tmp+st->offset, size);
if (strlen(buf) < (size_t)width)
g_strlcat(buf, tmp, size);
}
if( time(NULL)-st->t >= 1 ) {
st->t = time(NULL);
st->offset++;
}
g_free(tmp);
return buf;
}
