From 65f23dcb158663ba9c2cacf344182f4d66239f2d Mon Sep 17 00:00:00 2001
From: Pavel Roskin <proski@gnu.org>
Date: Sun, 8 Dec 2002 06:51:22 +0000
Subject: [PATCH] * util.c: Add functions for saving and loading file
 positions.

---
 src/ChangeLog |   4 ++
 src/util.c    | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++
 src/util.h    |  17 +++++++++
 3 files changed, 121 insertions(+)

diff --git a/src/ChangeLog b/src/ChangeLog
index a7b4748aa..bd64eda78 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2002-12-08  Pavel Roskin  <proski@gnu.org>
+
+	* util.c: Add functions for saving and loading file positions.
+
 2002-12-07  Pavel Roskin  <proski@gnu.org>
 
 	* file.c (is_wildcarded): Move ...
diff --git a/src/util.c b/src/util.c
index 80989825b..2be2e8c73 100644
--- a/src/util.c
+++ b/src/util.c
@@ -1242,3 +1242,103 @@ mc_mkstemps (char **pname, const char *prefix, const char *suffix)
 
     return -1;
 }
+
+
+/*
+ * Read and restore position for the given filename.
+ * If there is no stored data, return line 1 and col 0.
+ */
+void
+load_file_position (char *filename, long *line, long *column)
+{
+    char *fn;
+    FILE *f;
+    char buf[MC_MAXPATHLEN + 20];
+    int len;
+
+    /* defaults */
+    *line = 1;
+    *column = 0;
+
+    /* open file with positions */
+    fn = concat_dir_and_file (home_dir, MC_FILEPOS);
+    f = fopen (fn, "r");
+    g_free (fn);
+    if (!f) {
+	g_free (filename);
+	return;
+    }
+
+    len = strlen (filename);
+
+    while (fgets (buf, sizeof (buf), f)) {
+	char *p;
+
+	/* check if the filename matches the beginning of string */
+	if (strncmp (buf, filename, len) != 0)
+	    continue;
+
+	/* followed by single space */
+	if (buf[len] != ' ')
+	    continue;
+
+	/* and string without spaces */
+	p = &buf[len + 1];
+	if (strchr (p, ' '))
+	    continue;
+
+	*line = atol (p);
+	p = strchr (buf, ';');
+	*column = atol (&p[1]);
+    }
+    fclose (f);
+    g_free (filename);
+}
+
+/* Save position for the given file */
+void
+save_file_position (char *filename, long line, long column)
+{
+    char *tmp, *fn;
+    FILE *f, *t;
+    char buf[MC_MAXPATHLEN + 20];
+    int i = 1;
+    int len;
+
+    len = strlen (filename);
+
+    tmp = concat_dir_and_file (home_dir, MC_FILEPOS_TMP);
+    fn = concat_dir_and_file (home_dir, MC_FILEPOS);
+
+    /* open temporary file */
+    t = fopen (tmp, "w");
+    if (!t) {
+	g_free (tmp);
+	g_free (fn);
+	return;
+    }
+
+    /* put the new record */
+    fprintf (t, "%s %ld;%ld\n", filename, line, column);
+
+    /* copy records from the old file */
+    f = fopen (fn, "r");
+    if (f) {
+	while (fgets (buf, sizeof (buf), f)) {
+	    /* Skip entries for the current filename */
+	    if (strncmp (buf, filename, len) == 0 && buf[len] == ' '
+		&& !strchr (&buf[len + 1], ' '))
+		continue;
+
+	    fprintf (t, "%s", buf);
+	    if (++i > MC_FILEPOS_ENTRIES)
+		break;
+	}
+	fclose (f);
+    }
+
+    fclose (t);
+    rename (tmp, fn);
+    g_free (tmp);
+    g_free (fn);
+}
diff --git a/src/util.h b/src/util.h
index d5e6a2d07..653580268 100644
--- a/src/util.h
+++ b/src/util.h
@@ -128,6 +128,23 @@ void execute_hooks (Hook *hook_list);
 void delete_hook (Hook **hook_list, void (*hook_fn)(void *));
 int hook_present (Hook *hook_list, void (*hook_fn)(void *));
 
+
+/* Position saving and restoring */
+
+/* file where positions are stored */
+#define MC_FILEPOS ".mc/filepos"
+/* temporary file */
+#define MC_FILEPOS_TMP ".mc/filepos.tmp"
+/* maximum entries in MC_FILEPOS */
+#define MC_FILEPOS_ENTRIES 1024
+/* Load position for the given filename */
+void load_file_position (char *filename, long *line, long *column);
+/* Save position for the given filename */
+void save_file_position (char *filename, long line, long column);
+
+
+/* OS specific defines */
+
 #ifdef NATIVE_WIN32
 #    define PATH_SEP '\\'
 #    define PATH_SEP_STR "\\"