[src/trunk]: src/usr.bin/make make: document purpose of stepping back in the ...

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

details:   https://anonhg.NetBSD.org/src/rev/fc9ffe15db01
branches:  trunk
changeset: 952668:fc9ffe15db01
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sun Feb 14 12:16:13 2021 +0000

description:
make: document purpose of stepping back in the parser

In ApplyModifier_Assign there was no need to compute the delimiter from
st->startc since that has already be done at that point.

diffstat:

 usr.bin/make/var.c |  16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)

diffs (61 lines):

diff -r e3ced5ed9043 -r fc9ffe15db01 usr.bin/make/var.c
--- a/usr.bin/make/var.c        Sun Feb 14 12:14:37 2021 +0000
+++ b/usr.bin/make/var.c        Sun Feb 14 12:16:13 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: var.c,v 1.808 2021/02/06 21:40:14 rillig Exp $ */
+/*     $NetBSD: var.c,v 1.809 2021/02/14 12:16:13 rillig Exp $ */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -139,7 +139,7 @@
 #include "metachar.h"
 
 /*     "@(#)var.c      8.3 (Berkeley) 3/19/94" */
-MAKE_RCSID("$NetBSD: var.c,v 1.808 2021/02/06 21:40:14 rillig Exp $");
+MAKE_RCSID("$NetBSD: var.c,v 1.809 2021/02/14 12:16:13 rillig Exp $");
 
 typedef enum VarFlags {
        VAR_NONE        = 0,
@@ -3220,7 +3220,8 @@
        if (res != VPR_OK)
                return AMR_CLEANUP;
 
-       (*pp)--;
+       (*pp)--;                /* Go back to the st->endc. */
+
        if (cond_rc == COND_INVALID) {
                Error("Bad conditional expression `%s' in %s?%s:%s",
                    st->var->name.str, st->var->name.str, then_expr, else_expr);
@@ -3264,7 +3265,6 @@
 ApplyModifier_Assign(const char **pp, ApplyModifiersState *st)
 {
        GNode *scope;
-       char delim;
        char *val;
        VarParseResult res;
 
@@ -3303,12 +3303,11 @@
                break;
        }
 
-       delim = st->startc == '(' ? ')' : '}';
-       res = ParseModifierPart(pp, delim, st->eflags, st, &val);
+       res = ParseModifierPart(pp, st->endc, st->eflags, st, &val);
        if (res != VPR_OK)
                return AMR_CLEANUP;
 
-       (*pp)--;
+       (*pp)--;                /* Go back to the st->endc. */
 
        /* XXX: Expanding the variable name at this point sounds wrong. */
        if (st->eflags & VARE_WANTRES) {
@@ -3436,7 +3435,8 @@
        if (res != VPR_OK)
                return AMR_CLEANUP;
 
-       (*pp)--;
+       (*pp)--;                /* Go back to the st->endc. */
+
        if (lhs[0] == '\0' && val[0] == '\0') {
                st->newVal = FStr_InitRefer(val); /* special case */
        } else {