diff options
Diffstat (limited to 'src/common/history.c')
-rw-r--r-- | src/common/history.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/common/history.c b/src/common/history.c new file mode 100644 index 00000000..1cd6b508 --- /dev/null +++ b/src/common/history.c @@ -0,0 +1,121 @@ +/* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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; +} |