Imported from ../bash-2.05b.tar.gz.

builtins/let.def

@@ -1,7 +1,7 @@
 This file is let.def, from which is created let.c.
 It implements the builtin "let" in Bash.
 
-Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
+Copyright (C) 1987-2002 Free Software Foundation, Inc.
 
 This file is part of GNU Bash, the Bourne Again SHell.
 
@@ -24,13 +24,16 @@ $FUNCTION let_builtin
 $PRODUCES let.c
 $SHORT_DOC let arg [arg ...]
 Each ARG is an arithmetic expression to be evaluated.  Evaluation
-is done in long integers with no check for overflow, though division
-by 0 is trapped and flagged as an error.  The following list of
-operators is grouped into levels of equal-precedence operators.
+is done in fixed-width integers with no check for overflow, though
+division by 0 is trapped and flagged as an error.  The following
+list of operators is grouped into levels of equal-precedence operators.
 The levels are listed in order of decreasing precedence.
 
+	id++, id--	variable post-increment, post-decrement
+	++id, --id	variable pre-increment, pre-decrement
 	-, +		unary minus, plus
 	!, ~		logical and bitwise negation
+	**		exponentiation
 	*, /, %		multiplication, division, remainder
 	+, -		addition, subtraction
 	<<, >>		left and right bitwise shifts
@@ -48,7 +51,7 @@ The levels are listed in order of decreasing precedence.
 	&=, ^=, |=	assignment
 
 Shell variables are allowed as operands.  The name of the variable
-is replaced by its value (coerced to a long integer) within
+is replaced by its value (coerced to a fixed-width integer) within
 an expression.  The variable need not have its integer attribute
 turned on to be used in an expression.
 
@@ -77,9 +80,13 @@ int
 let_builtin (list)
      WORD_LIST *list;
 {
-  long ret;
+  intmax_t ret;
   int expok;
 
+  /* Skip over leading `--' argument. */
+  if (list && list->word && ISOPTION (list->word->word, '-'))
+    list = list->next;
+
   if (list == 0)
     {
       builtin_error ("expression expected");
@@ -102,7 +109,8 @@ exp_builtin (list)
      WORD_LIST *list;
 {
   char *exp;
-  int ret, expok;
+  intmax_t ret;
+  int expok;
 
   if (list == 0)
     {