Fix bug #2238: the read.c:eval() function was not entirely reentrant.

Apply patch #1022: fix a memory corruption on very long target-specific
variable definition lines.

ChangeLog

@@ -1,5 +1,13 @@
 2003-01-30  Paul D. Smith  <psmith@gnu.org>
 
+	* read.c (eval): eval() was not fully reentrant, because the
+	collapsed buffer was static.  Change it to be an automatic
+	variable so that eval() can be invoked recursively.
+	Fixes bug # 2238.
+	(eval): Apply patch # 1022: fix memory reference error on long
+	target-specific variable lines.
+	Patch provided by Steve Brown <Steve.Brown@macquarie.com>.
+
 	* function.c (check_numeric): Combine the is_numeric() function
 	into this function, since it's only called from one place.
 	Constify this function.  Have it print the incorrect string in the

read.c

@@ -452,8 +452,8 @@ eval_buffer (char *buffer)
 static int
 eval (struct ebuffer *ebuf, int set_default)
 {
-  static char *collapsed = 0;
+  char *collapsed = 0;
-  static unsigned int collapsed_length = 0;
+  unsigned int collapsed_length = 0;
   unsigned int commands_len = 200;
   char *commands;
   unsigned int commands_idx = 0;
@@ -566,9 +566,7 @@ eval (struct ebuffer *ebuf, int set_default)
       if (collapsed_length < linelen+1)
 	{
 	  collapsed_length = linelen+1;
-	  if (collapsed != 0)
+	  collapsed = (char *) xrealloc (collapsed, collapsed_length);
-	    free (collapsed);
-	  collapsed = (char *) xmalloc (collapsed_length);
 	}
       strcpy (collapsed, line);
       /* Collapse continuation lines.  */
@@ -1034,11 +1032,13 @@ eval (struct ebuffer *ebuf, int set_default)
            of the unparsed section of p2, for later.  */
         if (*lb_next != '\0')
           {
-            unsigned int l = p2 - variable_buffer;
+            unsigned int l = p - variable_buffer;
+            unsigned int l2 = p2 - variable_buffer;
             plen = strlen (p2);
             (void) variable_buffer_output (p2+plen,
                                            lb_next, strlen (lb_next)+1);
-            p2 = variable_buffer + l;
+            p = variable_buffer + l;
+            p2 = variable_buffer + l2;
           }
 
         /* See if it's an "override" or "export" keyword; if so see if what
@@ -1069,9 +1069,11 @@ eval (struct ebuffer *ebuf, int set_default)
                after it.  */
             if (semip)
               {
+                unsigned int l = p - variable_buffer;
                 *(--semip) = ';';
                 variable_buffer_output (p2 + strlen (p2),
                                         semip, strlen (semip)+1);
+                p = variable_buffer + l;
               }
             record_target_var (filenames, p, two_colon, v_origin, exported,
                                fstart);
@@ -1234,6 +1236,8 @@ eval (struct ebuffer *ebuf, int set_default)
   /* At eof, record the last rule.  */
   record_waiting_files ();
 
+  if (collapsed)
+    free ((char *) collapsed);
   free ((char *) commands);
 
   return 1;

tests/ChangeLog

@@ -1,5 +1,12 @@
 2003-01-30  Paul D. Smith  <psmith@gnu.org>
 
+	* scripts/features/targetvars: Test very long target-specific
+	variable definition lines (longer than the default make buffer
+	length).  Tests patch # 1022.
+
+	* scripts/functions/eval: Test very recursive $(eval ...) calls
+	with simple variable expansion (bug #2238).
+
 	* scripts/functions/word: Test error handling for word and
 	wordlist functions (bug #2407).
 

tests/scripts/features/targetvars

@@ -248,4 +248,23 @@ $answer = "ok ok foo pat\nok ok foo pat\n";
 &compare_output($answer, &get_logfile(1));
 
 
+# Test #16
+# Test target-specific variables with very long command line
+# (> make default buffer length)
+
+$makefile7 = &get_tmpfile;
+
+open(MAKEFILE, "> $makefile7");
+print MAKEFILE <<'EOF';
+base_metals_fmd_reports.sun5 base_metals_fmd_reports CreateRealPositions        CreateMarginFunds deals_changed_since : BUILD_OBJ=$(shell if [ -f               "build_information.generate" ]; then echo "$(OBJ_DIR)/build_information.o"; else echo "no build information"; fi  )
+
+deals_changed_since: ; @echo $(BUILD_OBJ)
+
+EOF
+close(MAKEFILE);
+
+&run_make_with_options("$makefile7", '', &get_logfile);
+$answer = "no build information\n";
+&compare_output($answer, &get_logfile(1));
+
 1;

tests/scripts/functions/call

@@ -66,7 +66,6 @@ close(MAKEFILE);
 
 &run_make_with_options($makefile, "", &get_logfile);
 $answer = "foo bar\ndefault file file\nb d f\n\n\nb\nbar foo baz\nfoo bar baz blarp quux \n";
-
 &compare_output($answer, &get_logfile(1));
 
 
@@ -94,10 +93,7 @@ EOF
 close(MAKEFILE);
 
 &run_make_with_options($makefile2, "", &get_logfile);
-
-# Create the answer to what should be produced by this Makefile
 $answer = "1 2 3 4 5 6 7 8 9\n1 2 3 4 5\n1 2 3\n1 2 3\n";
-
 &compare_output($answer,&get_logfile(1));
 
 1;

tests/scripts/functions/eval

@@ -88,4 +88,25 @@ $answer = "it\n";
 $answer = "it\nworked\n";
 &compare_output($answer,&get_logfile(1));
 
+
+# TEST very recursive invocation of eval
+
+$makefile3 = &get_tmpfile;
+
+open(MAKEFILE,"> $makefile3");
+
+print MAKEFILE <<'EOF';
+..9 := 0 1 2 3 4 5 6 7 8 9
+rev=$(eval res:=)$(foreach word,$1,$(eval res:=${word} ${res}))${res}
+a:=$(call rev,${..9})
+all: ; @echo '[$(a)]'
+
+EOF
+
+close(MAKEFILE);
+
+&run_make_with_options($makefile3, "", &get_logfile);
+$answer = "[         9 8 7 6 5 4 3 2 1 0 ]\n";
+&compare_output($answer,&get_logfile(1));
+
 1;