[src/trunk]: src/usr.bin/make make(1): use FStr in Var_UnExport

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

details:   https://anonhg.NetBSD.org/src/rev/9f855eaccba1
branches:  trunk
changeset: 978890:9f855eaccba1
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sun Dec 06 15:40:46 2020 +0000

description:
make(1): use FStr in Var_UnExport

diffstat:

 usr.bin/make/var.c |  39 +++++++++++++++++++++++----------------
 1 files changed, 23 insertions(+), 16 deletions(-)

diffs (92 lines):

diff -r 08e3dac3aa37 -r 9f855eaccba1 usr.bin/make/var.c
--- a/usr.bin/make/var.c        Sun Dec 06 15:00:25 2020 +0000
+++ b/usr.bin/make/var.c        Sun Dec 06 15:40:46 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: var.c,v 1.711 2020/12/06 14:50:09 rillig Exp $ */
+/*     $NetBSD: var.c,v 1.712 2020/12/06 15:40:46 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 1.711 2020/12/06 14:50:09 rillig Exp $");
+MAKE_RCSID("$NetBSD: var.c,v 1.712 2020/12/06 15:40:46 rillig Exp $");
 
 /* A string that may need to be freed after use. */
 typedef struct FStr {
@@ -311,6 +311,16 @@
 
 static VarExportedMode var_exportedVars = VAR_EXPORTED_NONE;
 
+#define FSTR_INIT { NULL, NULL }
+
+static void
+FStr_Assign(FStr *fstr, const char *str, void *freeIt)
+{
+       free(fstr->freeIt);
+       fstr->str = str;
+       fstr->freeIt = freeIt;
+}
+
 static void
 FStr_Done(FStr *fstr)
 {
@@ -771,13 +781,9 @@
 void
 Var_UnExport(const char *str)
 {
-       const char *varnames;
-       char *varnames_freeIt;
+       FStr varnames = FSTR_INIT;
        Boolean unexport_env;
 
-       varnames = NULL;
-       varnames_freeIt = NULL;
-
        str += strlen("unexport");
        unexport_env = strncmp(str, "-env", 4) == 0;
        if (unexport_env) {
@@ -785,31 +791,32 @@
        } else {
                cpp_skip_whitespace(&str);
                if (str[0] != '\0')
-                       varnames = str;
+                       FStr_Assign(&varnames, str, NULL);
        }
 
-       if (varnames == NULL) {
+       if (varnames.str == NULL) {
+               char *expanded;
                /* Using .MAKE.EXPORTED */
                (void)Var_Subst("${" MAKE_EXPORTED ":O:u}", VAR_GLOBAL,
-                   VARE_WANTRES, &varnames_freeIt);
+                   VARE_WANTRES, &expanded);
                /* TODO: handle errors */
-               varnames = varnames_freeIt;
+               FStr_Assign(&varnames, expanded, expanded);
        }
 
        {
                size_t i;
 
-               Words words = Str_Words(varnames, FALSE);
+               Words words = Str_Words(varnames.str, FALSE);
                for (i = 0; i < words.len; i++) {
                        const char *varname = words.words[i];
-                       UnexportVar(varname, unexport_env, varnames == str);
+                       UnexportVar(varname, unexport_env, varnames.str == str);
                }
                Words_Free(words);
-               if (varnames != str) {
+               if (varnames.str != str)
                        Var_Delete(MAKE_EXPORTED, VAR_GLOBAL);
-                       free(varnames_freeIt);
-               }
        }
+
+       FStr_Done(&varnames);
 }
 
 /* See Var_Set for documentation. */