[src/trunk]: src/usr.bin/make make(1): migrate Var_Parse API to parsing position

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

details:   https://anonhg.NetBSD.org/src/rev/d570313e024f
branches:  trunk
changeset: 1013684:d570313e024f
user:      rillig <rillig%NetBSD.org@localhost>
date:      Thu Sep 03 18:19:15 2020 +0000

description:
make(1): migrate Var_Parse API to parsing position

The ApplyModifier functions already use this pattern.  For simplicity
and consistency Var_Parse should do the same.  This saves a parameter to
be passed.

The migration takes place step by step, just like for the Lst functions
a few days ago.

diffstat:

 usr.bin/make/nonints.h |   3 ++-
 usr.bin/make/var.c     |  30 ++++++++++++++++++++----------
 2 files changed, 22 insertions(+), 11 deletions(-)

diffs (83 lines):

diff -r 106192895a74 -r d570313e024f usr.bin/make/nonints.h
--- a/usr.bin/make/nonints.h    Thu Sep 03 17:16:01 2020 +0000
+++ b/usr.bin/make/nonints.h    Thu Sep 03 18:19:15 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: nonints.h,v 1.103 2020/09/03 16:02:02 rillig Exp $     */
+/*     $NetBSD: nonints.h,v 1.104 2020/09/03 18:19:15 rillig Exp $     */
 
 /*-
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -214,6 +214,7 @@
 Boolean Var_Exists(const char *, GNode *);
 const char *Var_Value(const char *, GNode *, char **);
 const char *Var_Parse(const char *, GNode *, VarEvalFlags, int *, void **);
+const char *Var_ParsePP(const char **, GNode *, VarEvalFlags, void **);
 char *Var_Subst(const char *, GNode *, VarEvalFlags);
 void Var_Init(void);
 void Var_End(void);
diff -r 106192895a74 -r d570313e024f usr.bin/make/var.c
--- a/usr.bin/make/var.c        Thu Sep 03 17:16:01 2020 +0000
+++ b/usr.bin/make/var.c        Thu Sep 03 18:19:15 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: var.c,v 1.484 2020/09/02 06:25:48 rillig Exp $ */
+/*     $NetBSD: var.c,v 1.485 2020/09/03 18:19:15 rillig Exp $ */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -69,14 +69,14 @@
  */
 
 #ifndef MAKE_NATIVE
-static char rcsid[] = "$NetBSD: var.c,v 1.484 2020/09/02 06:25:48 rillig Exp $";
+static char rcsid[] = "$NetBSD: var.c,v 1.485 2020/09/03 18:19:15 rillig Exp $";
 #else
 #include <sys/cdefs.h>
 #ifndef lint
 #if 0
 static char sccsid[] = "@(#)var.c      8.3 (Berkeley) 3/19/94";
 #else
-__RCSID("$NetBSD: var.c,v 1.484 2020/09/02 06:25:48 rillig Exp $");
+__RCSID("$NetBSD: var.c,v 1.485 2020/09/03 18:19:15 rillig Exp $");
 #endif
 #endif /* not lint */
 #endif
@@ -1679,15 +1679,16 @@
        }
 
        if (eflags & VARE_WANTRES) {    /* Nested variable, evaluated */
-           const char *cp2;
-           int len;
-           void *freeIt;
+           const char *nested_p = p;
+           const char *nested_val;
+           void *nested_val_freeIt;
            VarEvalFlags nested_eflags = eflags & ~(unsigned)VARE_ASSIGN;
 
-           cp2 = Var_Parse(p, ctxt, nested_eflags, &len, &freeIt);
-           Buf_AddStr(&buf, cp2);
-           free(freeIt);
-           p += len;
+           nested_val = Var_ParsePP(&nested_p, ctxt, nested_eflags,
+                                    &nested_val_freeIt);
+           Buf_AddStr(&buf, nested_val);
+           free(nested_val_freeIt);
+           p += nested_p - p;
            continue;
        }
 
@@ -3624,6 +3625,15 @@
     return nstr;
 }
 
+const char *
+Var_ParsePP(const char **pp, GNode *ctxt, VarEvalFlags eflags, void **freePtr)
+{
+    int len;
+    const char *val = Var_Parse(*pp, ctxt, eflags, &len, freePtr);
+    *pp += len;
+    return val;
+}
+
 /* Substitute for all variables in the given string in the given context.
  *
  * If eflags & VARE_UNDEFERR, Parse_Error will be called when an undefined