Add a new configuration file command ifnxcp that allows file copying without overwriting already existing file.

git-svn-id: svn://katsu.triplehelix.org/dgamelaunch/trunk@410 db0b04b0-f4d1-0310-9a6d-de3e77497b0e

config.l

@@ -86,6 +86,7 @@ game_start	{ yylval.i = DGLTIME_GAMESTART; return TYPE_CMDQUEUENAME; }
 mkdir		{ yylval.i = DGLCMD_MKDIR;  return TYPE_DGLCMD1; }
 chdir		{ yylval.i = DGLCMD_CHDIR;  return TYPE_DGLCMD1; }
 cp		{ yylval.i = DGLCMD_CP;     return TYPE_DGLCMD2; }
+ifnxcp		{ yylval.i = DGLCMD_IF_NX_CP; return TYPE_DGLCMD2; }
 unlink		{ yylval.i = DGLCMD_UNLINK; return TYPE_DGLCMD1; }
 setenv		{ yylval.i = DGLCMD_SETENV; return TYPE_DGLCMD2; }
 exec		{ yylval.i = DGLCMD_EXEC;   return TYPE_DGLCMD2; }

dgamelaunch.h

@@ -99,6 +99,7 @@ typedef enum
     DGLCMD_NONE = 0,
     DGLCMD_MKDIR,	/* mkdir foo */
     DGLCMD_CHDIR,	/* chdir foo */
+    DGLCMD_IF_NX_CP,	/* ifnxcp foo bar */
     DGLCMD_CP,		/* cp foo bar */
     DGLCMD_UNLINK,	/* unlink foo */
     DGLCMD_EXEC,	/* exec foo bar */

dgl-common.c

@@ -144,6 +144,13 @@ dgl_exec_cmdqueue(struct dg_cmdpart *queue, int game, struct dg_user *me)
 	case DGLCMD_CHDIR:
 	    if (p1) chdir(p1);
 	    break;
+	case DGLCMD_IF_NX_CP:
+	    if (p1 && p2) {
+		FILE *tmpfile;
+		tmpfile = fopen(p2, "r");
+		if (tmpfile) break;
+	    }
+	    /* else fall through to cp */
 	case DGLCMD_CP:
 	    if (p1 && p2) {
 		FILE *cannedf, *newfile;

examples/dgamelaunch.conf

@@ -71,6 +71,7 @@ lockfile = "/dgl-lock"
 #   mkdir "foo"       = creates a directory "foo"
 #   chdir "foo"       = changes current work dir to "foo"
 #   cp "foo" "bar"    = copies file "foo" to "bar", overwriting previous "bar"
+#   ifnxcp "foo" "bar" = copies file "foo" to "bar", if "bar" doesn't exist
 #   unlink "foo"      = deletes file "foo"
 #   setenv "foo "bar" = sets environment variable "foo" to "bar"
 #   exec "foo" "bar"  = execute "foo" with "bar" as it's param