[src/trunk]: src/usr.bin/make make(1): extract FindLocalLegacyVar from Var_Parse

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b0436c53ef60
branches:  trunk
changeset: 942081:b0436c53ef60
user:      rillig <rillig%NetBSD.org@localhost>
date:      Thu Nov 05 18:43:55 2020 +0000

description:
make(1): extract FindLocalLegacyVar from Var_Parse

diffstat:

 usr.bin/make/var.c |  59 ++++++++++++++++++++++++++++++++---------------------
 1 files changed, 35 insertions(+), 24 deletions(-)

diffs (87 lines):

diff -r e5b44f73f236 -r b0436c53ef60 usr.bin/make/var.c
--- a/usr.bin/make/var.c        Thu Nov 05 18:26:59 2020 +0000
+++ b/usr.bin/make/var.c        Thu Nov 05 18:43:55 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: var.c,v 1.661 2020/11/05 18:26:59 rillig Exp $ */
+/*     $NetBSD: var.c,v 1.662 2020/11/05 18:43:55 rillig Exp $ */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -130,7 +130,7 @@
 #include "metachar.h"
 
 /*     "@(#)var.c      8.3 (Berkeley) 3/19/94" */
-MAKE_RCSID("$NetBSD: var.c,v 1.661 2020/11/05 18:26:59 rillig Exp $");
+MAKE_RCSID("$NetBSD: var.c,v 1.662 2020/11/05 18:43:55 rillig Exp $");
 
 #define VAR_DEBUG1(fmt, arg1) DEBUG1(VAR, fmt, arg1)
 #define VAR_DEBUG2(fmt, arg1, arg2) DEBUG2(VAR, fmt, arg1, arg2)
@@ -3617,6 +3617,37 @@
     return TRUE;
 }
 
+/* Find variables like @F or <D. */
+static Var *
+FindLocalLegacyVar(const char *varname, size_t namelen, GNode *ctxt,
+                  const char **out_extraModifiers)
+{
+    /* Only resolve these variables if ctxt is a "real" target. */
+    if (ctxt == VAR_CMDLINE || ctxt == VAR_GLOBAL)
+       return NULL;
+
+    if (namelen != 2)
+       return NULL;
+    if (varname[1] != 'F' && varname[1] != 'D')
+       return NULL;
+    if (strchr("@%?*!<>", varname[0]) == NULL)
+       return NULL;
+
+    {
+       char name[] = { varname[0], '\0' };
+       Var *v = VarFind(name, ctxt, 0);
+
+       if (v != NULL) {
+           if (varname[1] == 'D') {
+               *out_extraModifiers = "H:";
+           } else { /* F */
+               *out_extraModifiers = "T:";
+           }
+       }
+       return v;
+    }
+}
+
 /* Parse a long variable name enclosed in braces or parentheses such as $(VAR)
  * or ${VAR}, up to the closing brace or parenthesis, or in the case of
  * ${VAR:Modifiers}, up to the ':' that starts the modifiers.
@@ -3670,28 +3701,8 @@
     /* At this point, p points just after the variable name,
      * either at ':' or at endc. */
 
-    /*
-     * Check also for bogus D and F forms of local variables since we're
-     * in a local context and the name is the right length.
-     */
-    if (v == NULL && ctxt != VAR_CMDLINE && ctxt != VAR_GLOBAL &&
-       namelen == 2 && (varname[1] == 'F' || varname[1] == 'D') &&
-       strchr("@%?*!<>", varname[0]) != NULL)
-    {
-       /*
-        * Well, it's local -- go look for it.
-        */
-       char name[] = { varname[0], '\0' };
-       v = VarFind(name, ctxt, 0);
-
-       if (v != NULL) {
-           if (varname[1] == 'D') {
-               *out_TRUE_extraModifiers = "H:";
-           } else { /* F */
-               *out_TRUE_extraModifiers = "T:";
-           }
-       }
-    }
+    if (v == NULL)
+       v = FindLocalLegacyVar(varname, namelen, ctxt, out_TRUE_extraModifiers);
 
     if (v == NULL) {
        /* Defer expansion of dynamic variables if they appear in non-local