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git-svn-id: http://svn.irssi.org/repos/irssi/trunk@1501 dbcabf3a-b0e7-0310-adc4-f8d773084564
142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
/*
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line-split.c : irssi
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Copyright (C) 1999-2000 Timo Sirainen
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "module.h"
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#include "misc.h"
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/* Maximum line length - split to two lines if it's longer than this.
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This is mostly to prevent excessive memory usage. Like if someone DCC
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chats you, you both have very fast connections and the other side sends
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you 100 megs of text without any line feeds -> irssi will (try to)
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allocate 128M of memory for the line and will eventually crash when it
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can't allocate any more memory. If the line is split at every 64k the
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text buffer will free the old lines and the memory usage never gets
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too high. */
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#define MAX_CHARS_IN_LINE 65536
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struct _LINEBUF_REC {
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int len;
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int alloc;
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int remove;
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char *str;
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};
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static void linebuf_append(LINEBUF_REC *rec, const char *data, int len)
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{
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if (rec->len+len > rec->alloc) {
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rec->alloc = nearest_power(rec->len+len);;
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rec->str = rec->str == NULL ? g_malloc(rec->alloc) :
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g_realloc(rec->str, rec->alloc);
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}
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memcpy(rec->str + rec->len, data, len);
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rec->len += len;
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}
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static char *linebuf_find(LINEBUF_REC *rec, char chr)
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{
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int n;
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for (n = 0; n < rec->len; n++)
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if (rec->str[n] == chr) return rec->str+n;
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return NULL;
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}
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static int remove_newline(LINEBUF_REC *rec)
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{
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char *ptr;
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ptr = linebuf_find(rec, '\n');
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if (ptr == NULL) {
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/* LF wasn't found, wait for more data.. */
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if (rec->len < MAX_CHARS_IN_LINE)
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return 0;
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/* line buffer is too big - force a newline. */
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linebuf_append(rec, "\n", 1);
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ptr = rec->str+rec->len-1;
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}
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rec->remove = (int) (ptr-rec->str)+1;
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if (ptr != rec->str && ptr[-1] == '\r') {
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/* remove CR too. */
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ptr--;
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}
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*ptr = '\0';
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return 1;
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}
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/* line-split `data'. Initially `*buffer' should contain NULL. */
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int line_split(const char *data, int len, char **output, LINEBUF_REC **buffer)
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{
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LINEBUF_REC *rec;
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g_return_val_if_fail(data != NULL, -1);
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g_return_val_if_fail(output != NULL, -1);
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g_return_val_if_fail(buffer != NULL, -1);
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if (*buffer == NULL)
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*buffer = g_new0(LINEBUF_REC, 1);
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rec = *buffer;
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if (rec->remove > 0) {
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rec->len -= rec->remove;
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g_memmove(rec->str, rec->str+rec->remove, rec->len);
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rec->remove = 0;
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}
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if (len > 0)
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linebuf_append(rec, data, len);
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else if (len < 0) {
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/* connection closed.. */
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if (rec->len == 0)
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return -1;
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/* no new data got but still something in buffer.. */
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len = 0;
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if (linebuf_find(rec, '\n') == NULL) {
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/* connection closed and last line is missing \n ..
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just add it so we can see if it had
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anything useful.. */
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linebuf_append(rec, "\n", 1);
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}
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}
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*output = rec->str;
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return remove_newline(rec);
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}
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void line_split_free(LINEBUF_REC *buffer)
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{
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if (buffer != NULL) {
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if (buffer->str != NULL) g_free(buffer->str);
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g_free(buffer);
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}
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}
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/* Return 1 if there is no data in the buffer */
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int line_split_is_empty(LINEBUF_REC *buffer)
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{
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return buffer->len == 0;
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}
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