[src/trunk]: src/usr.bin/make make(1): use freeIt pattern in Arch_ParseArchive

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

details:   https://anonhg.NetBSD.org/src/rev/cbb775b81952
branches:  trunk
changeset: 1015870:cbb775b81952
user:      rillig <rillig%NetBSD.org@localhost>
date:      Mon Nov 02 18:24:42 2020 +0000

description:
make(1): use freeIt pattern in Arch_ParseArchive

This makes the memory management more obvious than before, where the
status of the variable libName depended on subLibName.

diffstat:

 usr.bin/make/arch.c |  14 ++++++--------
 1 files changed, 6 insertions(+), 8 deletions(-)

diffs (56 lines):

diff -r 7f9e05fe9bdb -r cbb775b81952 usr.bin/make/arch.c
--- a/usr.bin/make/arch.c       Mon Nov 02 18:15:12 2020 +0000
+++ b/usr.bin/make/arch.c       Mon Nov 02 18:24:42 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: arch.c,v 1.151 2020/10/31 18:41:07 rillig Exp $        */
+/*     $NetBSD: arch.c,v 1.152 2020/11/02 18:24:42 rillig Exp $        */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -130,7 +130,7 @@
 #include "config.h"
 
 /*     "@(#)arch.c     8.2 (Berkeley) 1/2/94"  */
-MAKE_RCSID("$NetBSD: arch.c,v 1.151 2020/10/31 18:41:07 rillig Exp $");
+MAKE_RCSID("$NetBSD: arch.c,v 1.152 2020/11/02 18:24:42 rillig Exp $");
 
 #ifdef TARGET_MACHINE
 #undef MAKE_MACHINE
@@ -205,6 +205,7 @@
     char *cp;                  /* Pointer into line */
     GNode *gn;                 /* New node */
     char *libName;             /* Library-part of specification */
+    char *libName_freeIt = NULL;
     char *memName;             /* Member-part of specification */
     char saveChar;             /* Ending delimiter of member-name */
     Boolean subLibName;                /* TRUE if libName should have/had
@@ -225,6 +226,7 @@
            const char *result;
            Boolean isError;
 
+           /* XXX: is expanded twice: once here and once below */
            (void)Var_Parse(&nested_p, ctxt, VARE_UNDEFERR|VARE_WANTRES,
                            &result, &result_freeIt);
            /* TODO: handle errors */
@@ -243,6 +245,7 @@
     if (subLibName) {
        (void)Var_Subst(libName, ctxt, VARE_UNDEFERR|VARE_WANTRES, &libName);
        /* TODO: handle errors */
+       libName_freeIt = libName;
     }
 
 
@@ -388,12 +391,7 @@
        *cp = saveChar;
     }
 
-    /*
-     * If substituted libName, free it now, since we need it no longer.
-     */
-    if (subLibName) {
-       free(libName);
-    }
+    free(libName_freeIt);
 
     cp++;                      /* skip the ')' */
     /* We promised that linePtr would be set up at the next non-space. */