PATCH: Parameter STTY should work as documented

PATCH: Parameter STTY should work as documented

[Bart Schaefer]

STTY
     If this parameter is set in a command's environment, the shell
     runs the stty command with the value of this parameter as
     arguments in order to set up the terminal before executing the
     command.  [...]  STTY is ignored if the command is run in the
     background, or if it is in the environment of the shell but not
     explicitly assigned to in the input line. This avoids running stty
     at every external command by accidentally exporting it. [...]

A patch for 3.0.8 will go up on the SourceForge patch manager soon.

Index: Src/exec.c
===================================================================
@@ -133,6 +133,7 @@
 
 static LinkList args;
 static int doneps4;
+static char *STTYval;
 
 /* Execution functions. */
 
@@ -444,7 +445,6 @@
 execute(Cmdnam not_used_yet, int dash)
 {
     Cmdnam cn;
-    static LinkList exargs;
     char buf[MAXCMDLEN], buf2[MAXCMDLEN];
     char *s, *z, *arg0;
     char **argv, **pp;
@@ -459,17 +459,19 @@
     /* If the parameter STTY is set in the command's environment, *
      * we first run the stty command with the value of this       *
      * parameter as it arguments.                                 */
-    if (!exargs && (s = zgetenv("STTY")) && isatty(0) &&
-	(GETPGRP() == getpid())) {
-	char *t;
+    if ((s = STTYval) && isatty(0) && (GETPGRP() == getpid())) {
+	LinkList exargs = args;
+	char *t = tricat("stty", " ", s);
 
-	exargs = args;	/* this prevents infinite recursion */
+	STTYval = 0;	/* this prevents infinite recursion */
+	zsfree(s);
 	args = NULL;
-	t = tricat("stty", " ", s);
 	execstring(t, 1, 0);
 	zsfree(t);
 	args = exargs;
-	exargs = NULL;
+    } else if (s) {
+	STTYval = 0;
+	zsfree(s);
     }
 
     cn = (Cmdnam) cmdnamtab->getnode(cmdnamtab, arg0);
@@ -1537,6 +1539,10 @@
 		    state->pc = opc;
 		    return;
 		}
+		if (strcmp(name, "STTY") == 0) {
+		    zsfree(STTYval);
+		    STTYval = ztrdup(val);
+		}
 		allexp = opts[ALLEXPORT];
 		opts[ALLEXPORT] = 1;
 		pm = setsparam(name, val);
@@ -2326,6 +2332,10 @@
 		if (!forked)
 		    setlimits(NULL);
 #endif
+		if (how & Z_ASYNC) {
+		    zsfree(STTYval);
+		    STTYval = 0;
+		}
 		execute((Cmdnam) hn, cflags & BINF_DASH);
 	    } else {		/* ( ... ) */
 		DPUTS(varspc,

-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com

Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net