PATCH: return status of let with floats

[Peter Stephenson <pws@xxxxxxx>]

(( 0.3 ))

currently returns status 1 because there is an implicit cast to
integer.  As documented, it should simply test whether the result is
zero, i.e. should function identically to

(( 0.3 == 0 ))

where the implicit cast is of the 0 to 0.0.  Certainly this seems to me
more consistent and useful.  I don't have a ksh which handles floating
point to try out, unfortunately.

Index: Src/builtin.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/builtin.c,v
retrieving revision 1.92
diff -u -r1.92 builtin.c
--- Src/builtin.c	11 Dec 2002 16:03:21 -0000	1.92
+++ Src/builtin.c	18 Dec 2002 16:48:12 -0000
@@ -4759,13 +4759,14 @@
 int
 bin_let(char *name, char **argv, Options ops, int func)
 {
-    zlong val = 0;
+    mnumber val = zero_mnumber;
 
     while (*argv)
-	val = mathevali(*argv++);
+	val = matheval(*argv++);
     /* Errors in math evaluation in let are non-fatal. */
     errflag = 0;
-    return !val;
+    /* should test for fabs(val.u.d) < epsilon? */
+    return (val.type == MN_INTEGER) ? val.u.l == 0 : val.u.d == 0.0;
 }
 
 /* umask command.  umask may be specified as octal digits, or in the  *
Index: Src/exec.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/exec.c,v
retrieving revision 1.47
diff -u -r1.47 exec.c
--- Src/exec.c	4 Dec 2002 13:57:51 -0000	1.47
+++ Src/exec.c	18 Dec 2002 16:48:12 -0000
@@ -3087,7 +3087,7 @@
 execarith(Estate state, int do_exec)
 {
     char *e;
-    zlong val = 0;
+    mnumber val = zero_mnumber;
     int htok = 0;
 
     if (isset(XTRACE)) {
@@ -3101,7 +3101,7 @@
     if (isset(XTRACE))
 	fprintf(xtrerr, " %s", e);
 
-    val = mathevali(e);
+    val = matheval(e);
 
     cmdpop();
 
@@ -3110,7 +3110,8 @@
 	fflush(xtrerr);
     }
     errflag = 0;
-    return !val;
+    /* should test for fabs(val.u.d) < epsilon? */
+    return (val.type == MN_INTEGER) ? val.u.l == 0 : val.u.d == 0.0;
 }
 
 /* perform time ... command */

-- 
Peter Stephenson <pws@xxxxxxx>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 692070


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