Extra case for ERR_RETURN and ERR_EXIT.

Don't trigger just because status is non-zero at end of
complex shell construct as this may be a case we've already
suppressed.

ChangeLog

@@ -1,3 +1,9 @@
+2016-12-05  Peter Stephenson  <p.stephenson@samsung.com>
+
+	* 40096: Src/exec.c, Src/loop.c, Src/zsh.h, Test/C03traps.ztst:
+	Don't trigger ERR_EXIT or ERR_RETURN on non-zero status after
+	shell construct.
+
 2016-12-04  Daniel Shahaf  <d.s@daniel.shahaf.name>
 
 	* unposted: Functions/VCS_Info/Backends/VCS_INFO_get_data_git:

Src/exec.c

@@ -46,6 +46,11 @@ enum {
 /**/
 int noerrexit;
 
+/* used to suppress ERREXIT for one occurrence */
+
+/**/
+int this_noerrexit;
+
 /*
  * noerrs = 1: suppress error messages
  * noerrs = 2: don't set errflag on parse error, either
@@ -1238,7 +1243,8 @@ execlist(Estate state, int dont_change_job, int exiting)
     }
     while (wc_code(code) == WC_LIST && !breaks && !retflag && !errflag) {
 	int donedebug;
-	int this_noerrexit = 0, this_donetrap = 0;
+	int this_donetrap = 0;
+	this_noerrexit = 0;
 
 	ltype = WC_LIST_TYPE(code);
 	csp = cmdsp;
@@ -5813,6 +5819,7 @@ execsave(void)
     es->trapisfunc = trapisfunc;
     es->traplocallevel = traplocallevel;
     es->noerrs = noerrs;
+    es->this_noerrexit = this_noerrexit;
     es->underscore = ztrdup(zunderscore);
     es->next = exstack;
     exstack = es;
@@ -5847,6 +5854,7 @@ execrestore(void)
     trapisfunc = en->trapisfunc;
     traplocallevel = en->traplocallevel;
     noerrs = en->noerrs;
+    this_noerrexit = en->this_noerrexit;
     setunderscore(en->underscore);
     zsfree(en->underscore);
     free(en);

Src/loop.c

@@ -208,6 +208,7 @@ execfor(Estate state, int do_exec)
     loops--;
     simple_pline = old_simple_pline;
     state->pc = end;
+    this_noerrexit = 1;
     return lastval;
 }
 
@@ -335,6 +336,7 @@ execselect(Estate state, UNUSED(int do_exec))
     loops--;
     simple_pline = old_simple_pline;
     state->pc = end;
+    this_noerrexit = 1;
     return lastval;
 }
 
@@ -472,6 +474,7 @@ execwhile(Estate state, UNUSED(int do_exec))
     popheap();
     loops--;
     state->pc = end;
+    this_noerrexit = 1;
     return lastval;
 }
 
@@ -523,6 +526,7 @@ execrepeat(Estate state, UNUSED(int do_exec))
     loops--;
     simple_pline = old_simple_pline;
     state->pc = end;
+    this_noerrexit = 1;
     return lastval;
 }
 
@@ -573,6 +577,7 @@ execif(Estate state, int do_exec)
 	    lastval = 0;
     }
     state->pc = end;
+    this_noerrexit = 1;
 
     return lastval;
 }
@@ -682,6 +687,7 @@ execcase(Estate state, int do_exec)
 
     if (!anypatok)
 	lastval = 0;
+    this_noerrexit = 1;
 
     return lastval;
 }

Src/zsh.h

@@ -1070,6 +1070,7 @@ struct execstack {
     int trapisfunc;
     int traplocallevel;
     int noerrs;
+    int this_noerrexit;
     char *underscore;
 };
 

Test/C03traps.ztst

@@ -626,6 +626,76 @@ F:Must be tested with a top-level script rather than source or function
 >before-out
 >before-in
 
+  (setopt err_exit
+  for x in y; do
+    false && true
+  done
+  print OK
+  )
+0:ERR_EXIT not triggered by status 1 at end of for
+>OK
+
+  (setopt err_exit
+  integer x=0
+  while (( ! x++ )); do
+    false && true
+  done
+  print OK
+  )
+0:ERR_EXIT not triggered by status 1 at end of while
+>OK
+
+  (setopt err_exit
+  repeat 1; do
+    false && true
+  done
+  print OK
+  )
+0:ERR_EXIT not triggered by status 1 at end of repeat
+>OK
+
+  (setopt err_exit
+  if true; then
+    false && true
+  fi
+  print OK
+  )
+0:ERR_EXIT not triggered by status 1 at end of if
+>OK
+
+  (setopt err_exit
+  for x in y; do
+    false
+  done
+  print OK
+  )
+1:ERR_EXIT triggered by status 1 within for
+
+  (setopt err_exit
+  integer x=0
+  while (( ! x++ )); do
+    false
+  done
+  print OK
+  )
+1:ERR_EXIT triggered by status 1 within while
+
+  (setopt err_exit
+  repeat 1; do
+    false
+  done
+  print OK
+  )
+1:ERR_EXIT triggered by status 1 within repeat
+
+  (setopt err_exit
+  if true; then
+    false
+  fi
+  print OK
+  )
+1:ERR_EXIT triggered by status 1 within if
+
   if zmodload zsh/system 2>/dev/null; then
   (
     trap 'echo TERM; exit 2' TERM