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/* X-Chat
* Copyright (C) 1998 Peter Zelezny.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <string.h>
#include <stdlib.h>
#include "history.h"
void
history_add (struct history *his, char *text)
{
if (his->lines[his->realpos])
free (his->lines[his->realpos]);
his->lines[his->realpos] = strdup (text);
his->realpos++;
if (his->realpos == HISTORY_SIZE)
his->realpos = 0;
his->pos = his->realpos;
}
void
history_free (struct history *his)
{
int i;
for (i = 0; i < HISTORY_SIZE; i++)
{
if (his->lines[i])
{
free (his->lines[i]);
his->lines[i] = 0;
}
}
}
char *
history_down (struct history *his)
{
int next;
if (his->pos == his->realpos) /* allow down only after up */
return 0;
if (his->realpos == 0)
{
if (his->pos == HISTORY_SIZE - 1)
{
his->pos = 0;
return "";
}
} else
{
if (his->pos == his->realpos - 1)
{
his->pos++;
return "";
}
}
next = 0;
if (his->pos < HISTORY_SIZE - 1)
next = his->pos + 1;
if (his->lines[next])
{
his->pos = next;
return his->lines[his->pos];
}
return 0;
}
char *
history_up (struct history *his, char *current_text)
{
int next;
if (his->realpos == HISTORY_SIZE - 1)
{
if (his->pos == 0)
return 0;
} else
{
if (his->pos == his->realpos + 1)
return 0;
}
next = HISTORY_SIZE - 1;
if (his->pos != 0)
next = his->pos - 1;
if (his->lines[next])
{
if
(
current_text[0] && strcmp(current_text, his->lines[next]) &&
(!his->lines[his->pos] || strcmp(current_text, his->lines[his->pos])) &&
(!his->lines[his->realpos] || strcmp(current_text, his->lines[his->pos]))
)
{
history_add (his, current_text);
}
his->pos = next;
return his->lines[his->pos];
}
return 0;
}
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