Mercurial > mbsePi-apps / file diff

--- a/brewco/util.c	Thu Dec 17 22:45:54 2015 +0100
+++ b/brewco/util.c	Sun Dec 20 20:37:40 2015 +0100
@@ -76,6 +76,69 @@
 
 
 
+/*
+ * Buffered filecopy, filetime is preserved.
+ */
+int file_cp(char *from, char *to)
+{
+    char		*line;
+    FILE		*stfrom, *stto;
+    int			dummy, bread;
+    static int		error;
+    struct stat 	sb;
+    struct utimbuf 	ut;
+
+    stfrom = fopen(from, "r");
+    if (stfrom == NULL)
+	return errno;
+
+    stto = fopen(to, "w");
+    if (stto == NULL) {
+	error = errno;
+	fclose(stfrom);
+	return error;
+    }
+
+    line = malloc(16384);
+    do {
+	bread = fread(line, 1, 16384, stfrom);
+	dummy = fwrite(line, 1, bread, stto);
+	if (bread != dummy) {
+	    error = errno;
+	    fclose(stfrom);
+	    fclose(stto);
+	    unlink(to);
+	    free(line);
+	    return error;
+	}
+    } while (bread != 0);
+    free(line);
+    fclose(stfrom);
+    if (fclose(stto) != 0) {
+	error = errno;
+	unlink(to);
+	return error;
+    }
+
+    /*
+     * copy successfull, now copy file- and modification-time
+     */
+    if (stat(from, &sb) == 0) {
+	ut.actime = mktime(localtime(&sb.st_atime));
+	ut.modtime = mktime(localtime(&sb.st_mtime));
+	if (utime(to, &ut) != 0) {
+	    error = errno;
+	    unlink(to);
+	    return error;
+	}
+	chmod(to, sb.st_mode);
+    }
+
+    return 0;
+}
+
+
+
 long millis(void)
 {
     struct timespec	now;