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-rw-r--r--logview/src/logview-utils.c282
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diff --git a/logview/src/logview-utils.c b/logview/src/logview-utils.c
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+/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
+/* logview-utils.c - misc logview utilities
+ *
+ * Copyright (C) 1998 Cesar Miquel <[email protected]>
+ * Copyright (C) 2008 Cosimo Cecchi <[email protected]>
+ *
+ * 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., 551 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#define _XOPEN_SOURCE
+#define _XOPEN_SOURCE_EXTENDED 1 /* strptime is XPG4v2 */
+#include <time.h>
+#include <string.h>
+#include <stdlib.h>
+#include <math.h>
+
+#include <glib.h>
+
+#include "logview-utils.h"
+
+void
+logview_utils_day_free (Day *day)
+{
+ if (!day) {
+ return;
+ }
+
+ g_date_free (day->date);
+ g_slice_free (Day, day);
+}
+
+Day *
+logview_utils_day_copy (Day *day)
+{
+ Day *retval;
+
+ retval = g_slice_new0 (Day);
+ retval->date = g_date_new_julian (g_date_get_julian (day->date));
+ retval->first_line = day->first_line;
+ retval->last_line = day->last_line;
+ retval->timestamp_len = day->timestamp_len;
+
+ return retval;
+}
+
+GSList *
+logview_utils_day_list_copy (GSList *days)
+{
+ GSList *l, *retval = NULL;
+
+ for (l = days; l; l = l->next) {
+ retval = g_slist_prepend (retval, logview_utils_day_copy (l->data));
+ }
+
+ return g_slist_reverse (retval);
+}
+
+gint
+days_compare (gconstpointer a, gconstpointer b)
+{
+ const Day *day1 = a, *day2 = b;
+
+ return g_date_compare (day1->date, day2->date);
+}
+
+static GDate *
+string_get_date (const char *line, char **time_string, int *timestamp_len)
+{
+ GDate *date = NULL;
+ struct tm tp;
+ char *cp = NULL, *timestamp = NULL;
+
+ /* it's safe to assume that if strptime returns NULL, it's
+ * because of an error (format unmatched). being a log file, it's very
+ * unlikely that there aren't any more characters after the date.
+ */
+
+ if (line == NULL || line[0] == '\0') {
+ return NULL;
+ }
+
+ /* this parses the "MonthName DayNo" format */
+ cp = strptime (line, "%b %d", &tp);
+ if (cp) {
+ goto out;
+ }
+
+ /* this parses the YYYY-MM-DD format */
+ cp = strptime (line, "%F", &tp);
+ if (cp) {
+ goto out;
+ }
+
+out:
+ if (cp) {
+ /* the year doesn't matter to us now */
+ date = g_date_new_dmy (tp.tm_mday, tp.tm_mon + 1, 1);
+ *time_string = g_strndup (line, cp - line);
+
+ timestamp = strptime (cp, "%X", &tp);
+ if (timestamp) {
+ *timestamp_len = timestamp - line;
+ }
+ }
+
+ return date;
+}
+
+/**
+ * log_read_dates:
+ *
+ * @buffer_lines: an array of text lines.
+ * @current: the mtime of the file being parsed.
+ *
+ * Reads all the dates inside the text buffer.
+ * All dates are given with respect to the 1/1/1970
+ * and are then corrected to the correct year once we
+ * reach the end.
+ *
+ * Returns: a #GSList of #Day structures.
+ */
+
+GSList *
+log_read_dates (const char **buffer_lines, time_t current)
+{
+ int current_year, offsetyear, i, n, rangemin, rangemax, timestamp_len = 0;
+ GSList *days = NULL;
+ GDate *date = NULL;
+ struct tm *tmptm;
+ char *date_string = NULL;
+ Day *day;
+ gboolean done = FALSE;
+
+ g_return_val_if_fail (buffer_lines != NULL, NULL);
+
+ n = g_strv_length ((char **) buffer_lines);
+
+ tmptm = localtime (&current);
+ current_year = tmptm->tm_year + 1900;
+ offsetyear = 0;
+
+ /* find the first line with a date we're able to parse */
+ for (i = 0; buffer_lines[i]; i++) {
+ if ((date = string_get_date (buffer_lines[i], &date_string, &timestamp_len)) != NULL)
+ break;
+ }
+
+ if (!date) {
+ /* no valid dates in the array, return NULL */
+ return NULL;
+ }
+
+ if (!g_date_valid (date)) {
+ g_date_free (date);
+ g_free (date_string);
+ return NULL;
+ }
+
+ g_date_set_year (date, current_year);
+
+ day = g_slice_new0 (Day);
+ days = g_slist_append (days, day);
+
+ /* $i now contains the line number for the first good date */
+ day->date = date;
+ day->first_line = i;
+ day->last_line = -1;
+ day->timestamp_len = timestamp_len;
+
+ /* now scan the logfile to get the last line of the day */
+ rangemin = i;
+ rangemax = n - 1;
+
+ while (!done) {
+ /* find out the last line of the day we're currently building */
+
+ i = n - 1;
+
+ while (day->last_line < 0) {
+ if (strstr (buffer_lines[i], date_string)) {
+ /* if we find the same string on the last line of the log, we're done */
+ if (i == n - 1) {
+ done = TRUE;
+ day->last_line = i;
+ break;
+ }
+
+ /* we're still in a section of lines with the same date;
+ * - if the next one changes, then we're on the last.
+ * - else we keep searching in the following.
+ */
+
+ if (!strstr (buffer_lines[i + 1], date_string)) {
+ day->last_line = i;
+ break;
+ } else {
+ rangemin = i;
+ i = floor (((float) i + (float) rangemax) / 2.);
+ }
+ } else {
+ /* we can't find the same date here; go back to a safer range. */
+ rangemax = i;
+ i = floor (((float) rangemin + (float) i) / 2.);
+ }
+ }
+
+ g_free (date_string);
+ date_string = NULL;
+
+ if (!done) {
+ /* this means we finished the current day but we're not at the end
+ * of the buffer: reset the parameters for the next day.
+ */
+ GDate *newdate = NULL;
+
+ for (i = day->last_line + 1; buffer_lines[i]; i++) {
+ if ((newdate = string_get_date (buffer_lines[i], &date_string, &timestamp_len)) != NULL)
+ break;
+ }
+
+ if (date_string == NULL && i == n - 1) {
+ done = TRUE;
+ }
+
+ /* this will set the last line of the "old" log to either:
+ * - "n - 1" if we can't find another date
+ * - the line before the new date else.
+ */
+ day->last_line = i - 1;
+
+ if (newdate) {
+ /* append a new day to the list */
+
+ g_date_set_year (newdate, current_year + offsetyear);
+
+ if (g_date_compare (newdate, date) < 1) {
+ /* this isn't possible, as we're reading the log forward.
+ * so it means that newdate is the next year.
+ */
+ g_date_add_years (newdate, 1);
+ offsetyear++;
+ }
+
+ date = newdate;
+ day = g_slice_new0 (Day);
+ days = g_slist_prepend (days, day);
+
+ day->date = date;
+ day->first_line = i;
+ day->last_line = -1;
+ day->timestamp_len = timestamp_len;
+ rangemin = i;
+ rangemax = n - 1;
+ }
+ }
+ }
+
+ if (date_string) {
+ g_free (date_string);
+ }
+
+ /* sort the days in chronological order */
+ days = g_slist_sort (days, days_compare);
+
+ return days;
+}
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