Adding "-L logfile" option for setting new logfile's name

Now it's possible to set your own lofile name with
this option ONLY. It fixes also API of old versions.

2 files changed, 16 insertions, 16 deletions

diff --git a/src/doc/screen.1 b/src/doc/screen.1
index eabd763..5b14d91 100644
--- a/src/doc/screen.1
+++ b/src/doc/screen.1
@@ -261,9 +261,12 @@ Ask your system administrator if you are not sure. Remove sessions with the
 .B \-L
 tells
 .I screen
-to turn on automatic output logging for the windows. By default, logfile's name
-is screenlog.0. You can set new name: add it right after -L option e.g. "screen
--L my_logfile". Keep in mind that name can not start with "-" symbol.
+to turn on automatic output logging for the windows.
+.TP 5
+.BI "\-L logfile " file
+By default logfile name is \*Qscreenlog.0\*Q. You can also set new logfile name
+with the \*Qlogfile\*Q option. Keep in mind that logfile name can not start with
+the "-" symbol.
 .TP 5
 .B \-m
 causes
diff --git a/src/screen.c b/src/screen.c
index 641d889..9e1072a 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -667,19 +667,16 @@ int main(int ac, char** av)
             break;
 
           case 'L':
-            if (--ac != 0) {
-              char *newlogfile = SaveStr(*++av);
-              if (strlen(newlogfile) > PATH_MAX)
-                Panic(0, "-L: logfile name too long. (max. %d char)", PATH_MAX);
-
-              FILE *w_check;
-              if ((w_check = fopen(newlogfile, "w")) == NULL)
-                Panic(0, "-L: logfile name access problem");
-              else
-                fclose(w_check);
-
-              if (newlogfile[0] != '-')
-                screenlogfile = newlogfile;
+            if (--ac > 0 && !strcmp(*++av, "logfile")) {
+              *++av; // Now '*av' is a logfile parameter
+
+              if (strlen(*av) > PATH_MAX)
+                Panic(1, "-L: logfile name too long. (max. %d char)", PATH_MAX);
+
+              if (*av[0] == '-')
+                Panic(0, "-L: logfile name can not start with \"-\" symbol");
+
+              screenlogfile = SaveStr(*av);
             }
             nwin_options.Lflag = 1;
             break;