[/trunk] Changeset 203 by mikael
* Add /info command.
/*
* hbuf.c -- History buffer implementation
*
* Copyright (C) 2005 Mikael Berthe <bmikael@lists.lilotux.net>
*
* 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 "hbuf.h"
/* This is a private structure type */
typedef struct {
char *ptr;
char *ptr_end; // beginning of the block
char *ptr_end_alloc; // end of the current persistent block
guchar flags;
// XXX This should certainly be a pointer, and be allocated only when needed
// (for ex. when HBB_FLAG_PERSISTENT is set).
struct { // hbuf_line_info
time_t timestamp;
guchar flags;
} prefix;
} hbuf_block;
// hbuf_add_line(p_hbuf, text, prefix_flags, width)
// Add a line to the given buffer. If width is not null, then lines are
// wrapped at this length.
//
// Note 1: Splitting according to width won't work if there are tabs; they
// should be expanded before.
// Note 2: width does not include the ending \0.
void hbuf_add_line(GList **p_hbuf, const char *text, time_t timestamp,
guint prefix_flags, guint width)
{
GList *hbuf = *p_hbuf;
char *line, *cr, *end;
hbuf_block *hbuf_block_elt;
if (!text) return;
hbuf_block_elt = g_new0(hbuf_block, 1);
hbuf_block_elt->prefix.timestamp = timestamp;
hbuf_block_elt->prefix.flags = prefix_flags;
if (!hbuf) {
do {
hbuf_block_elt->ptr = g_new(char, HBB_BLOCKSIZE);
} while (!hbuf_block_elt->ptr);
hbuf_block_elt->flags = HBB_FLAG_ALLOC | HBB_FLAG_PERSISTENT;
hbuf_block_elt->ptr_end_alloc = hbuf_block_elt->ptr + HBB_BLOCKSIZE;
*p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt);
} else {
hbuf_block *hbuf_b_prev = g_list_last(hbuf)->data;
hbuf_block_elt->ptr = hbuf_b_prev->ptr_end;
hbuf_block_elt->flags = HBB_FLAG_PERSISTENT;
hbuf_block_elt->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc;
*p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt);
}
if (strlen(text) >= HBB_BLOCKSIZE) {
// Too long
text = "[ERR:LINE_TOO_LONG]";
}
if (hbuf_block_elt->ptr + strlen(text) >= hbuf_block_elt->ptr_end_alloc) {
// Too long for the current allocated bloc, we need another one
do {
hbuf_block_elt->ptr = g_new0(char, HBB_BLOCKSIZE);
} while (!hbuf_block_elt->ptr);
hbuf_block_elt->flags = HBB_FLAG_ALLOC | HBB_FLAG_PERSISTENT;
hbuf_block_elt->ptr_end_alloc = hbuf_block_elt->ptr + HBB_BLOCKSIZE;
}
line = hbuf_block_elt->ptr;
// Ok, now we can copy the text..
strcpy(line, text);
hbuf_block_elt->ptr_end = line + strlen(line) + 1;
end = hbuf_block_elt->ptr_end;
// Let's add non-persistent blocs if necessary
// - If there are '\n' in the string
// - If length > width (and width != 0)
cr = strchr(line, '\n');
while (cr || (width && strlen(line) > width)) {
hbuf_block *hbuf_b_prev = hbuf_block_elt;
if (!width || (cr && (cr - line <= (int)width))) {
// Carriage return
*cr = 0;
hbuf_block_elt->ptr_end = cr;
// Create another persistent block
hbuf_block_elt = g_new0(hbuf_block, 1);
hbuf_block_elt->ptr = hbuf_b_prev->ptr_end + 1; // == cr+1
hbuf_block_elt->ptr_end = end;
hbuf_block_elt->flags = HBB_FLAG_PERSISTENT;
hbuf_block_elt->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc;
*p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt);
line = hbuf_block_elt->ptr;
} else {
// We need to break where we can find a space char
char *br; // break pointer
for (br = line + width; br > line && *br != 32 && *br != 9; br--)
;
if (br <= line)
br = line + width;
else
br++;
hbuf_block_elt->ptr_end = br;
// Create another block, non-persistent
hbuf_block_elt = g_new0(hbuf_block, 1);
hbuf_block_elt->ptr = hbuf_b_prev->ptr_end; // == br
hbuf_block_elt->ptr_end = end;
hbuf_block_elt->flags = 0;
hbuf_block_elt->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc;
*p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt);
line = hbuf_block_elt->ptr;
}
cr = strchr(line, '\n');
}
}
// hbuf_free()
// Destroys all hbuf list.
void hbuf_free(GList **p_hbuf)
{
hbuf_block *hbuf_b_elt;
GList *hbuf_elt;
GList *first_elt = g_list_first(*p_hbuf);
for (hbuf_elt = first_elt; hbuf_elt; hbuf_elt = g_list_next(hbuf_elt)) {
hbuf_b_elt = (hbuf_block*)(hbuf_elt->data);
if (hbuf_b_elt->flags & HBB_FLAG_ALLOC) {
g_free(hbuf_b_elt->ptr);
}
}
g_list_free(*p_hbuf);
*p_hbuf = NULL;
}
// hbuf_rebuild()
// Rebuild all hbuf list, with the new width.
// If width == 0, lines are not wrapped.
void hbuf_rebuild(GList **p_hbuf, unsigned int width)
{
GList *first_elt, *curr_elt, *next_elt;
hbuf_block *hbuf_b_curr, *hbuf_b_next;
// *p_hbuf needs to be the head of the list
first_elt = *p_hbuf = g_list_first(*p_hbuf);
// #1 Remove non-persistent blocks (ptr_end should be updated!)
curr_elt = first_elt;
while (curr_elt) {
next_elt = g_list_next(curr_elt);
// Last element?
if (!next_elt)
break;
hbuf_b_curr = (hbuf_block*)(curr_elt->data);
hbuf_b_next = (hbuf_block*)(next_elt->data);
// Is next line not-persistent?
if (!(hbuf_b_next->flags & HBB_FLAG_PERSISTENT)) {
hbuf_b_curr->ptr_end = hbuf_b_next->ptr_end;
g_list_delete_link(curr_elt, next_elt);
} else
curr_elt = next_elt;
}
// #2 Go back to head and create non-persistent blocks when needed
if (width) {
char *line, *end;
curr_elt = first_elt;
while (curr_elt) {
hbuf_b_curr = (hbuf_block*)(curr_elt->data);
line = hbuf_b_curr->ptr;
if (strlen(line) > width) {
hbuf_block *hbuf_b_prev = hbuf_b_curr;
// We need to break where we can find a space char
char *br; // break pointer
for (br = line + width; br > line && *br != 32 && *br != 9; br--)
;
if (br <= line)
br = line + width;
else
br++;
end = hbuf_b_curr->ptr_end;
hbuf_b_curr->ptr_end = br;
// Create another block, non-persistent
hbuf_b_curr = g_new0(hbuf_block, 1);
hbuf_b_curr->ptr = hbuf_b_prev->ptr_end; // == br
hbuf_b_curr->ptr_end = end;
hbuf_b_curr->flags = 0;
hbuf_b_curr->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc;
// This is OK because insert_before(NULL) == append():
*p_hbuf = g_list_insert_before(*p_hbuf, curr_elt->next, hbuf_b_curr);
}
curr_elt = g_list_next(curr_elt);
}
}
}
// hbuf_previous_persistent()
// Returns the previous persistent block (line). If the given line is
// persistent, then it is returned.
// This function is used for example when resizing a buffer. If the top of the
// screen is on a non-persistent block, then a screen resize could destroy this
// line...
GList *hbuf_previous_persistent(GList *l_line)
{
hbuf_block *hbuf_b_elt;
while (l_line) {
hbuf_b_elt = (hbuf_block*)l_line->data;
if (hbuf_b_elt->flags & HBB_FLAG_PERSISTENT)
return l_line;
l_line = g_list_previous(l_line);
}
return NULL;
}
// hbuf_get_lines(hbuf, n, where) FIXME bad comments XXX
// Returns an array of 2*n pointers (for n prefixes + n lines from hbuf)
// (prefix line 1, line 1, prefix line 2, line 2, etc.)
// (The first line will be the line currently pointed by hbuf)
// Note:The caller should free the array after use.
hbb_line **hbuf_get_lines(GList *hbuf, unsigned int n)
{
unsigned int i;
hbb_line **array = g_new0(hbb_line*, n);
hbb_line **array_elt = array;
for (i=0 ; i < n ; i++) {
if (hbuf) {
hbuf_block *blk = (hbuf_block*)(hbuf->data);
int maxlen;
maxlen = blk->ptr_end - blk->ptr;
*array_elt = (hbb_line*)g_new(hbb_line, 1);
(*array_elt)->timestamp = blk->prefix.timestamp;
(*array_elt)->flags = blk->prefix.flags;
(*array_elt)->text = g_strndup(blk->ptr, maxlen);
hbuf = g_list_next(hbuf);
} else
break;
array_elt++;
}
return array;
}