[src/trunk]: src/usr.bin/make make(1): clean up memory handling in Parse_DoVar

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

details:   https://anonhg.NetBSD.org/src/rev/238d967f7780
branches:  trunk
changeset: 958020:238d967f7780
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sun Dec 20 14:48:35 2020 +0000

description:
make(1): clean up memory handling in Parse_DoVar

diffstat:

 usr.bin/make/parse.c |  44 ++++++++++++++++++--------------------------
 1 files changed, 18 insertions(+), 26 deletions(-)

diffs (112 lines):

diff -r 9ed29e4030c2 -r 238d967f7780 usr.bin/make/parse.c
--- a/usr.bin/make/parse.c      Sun Dec 20 14:39:46 2020 +0000
+++ b/usr.bin/make/parse.c      Sun Dec 20 14:48:35 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: parse.c,v 1.505 2020/12/20 14:32:13 rillig Exp $       */
+/*     $NetBSD: parse.c,v 1.506 2020/12/20 14:48:35 rillig Exp $       */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -117,7 +117,7 @@
 #include "pathnames.h"
 
 /*     "@(#)parse.c    8.3 (Berkeley) 3/19/94" */
-MAKE_RCSID("$NetBSD: parse.c,v 1.505 2020/12/20 14:32:13 rillig Exp $");
+MAKE_RCSID("$NetBSD: parse.c,v 1.506 2020/12/20 14:48:35 rillig Exp $");
 
 /* types and constants */
 
@@ -1925,7 +1925,7 @@
 
 static void
 VarAssign_EvalSubst(const char *name, const char *uvalue, GNode *ctxt,
-                   const char **out_avalue, void **out_avalue_freeIt)
+                   FStr *out_avalue)
 {
        const char *avalue;
        char *evalue;
@@ -1955,13 +1955,12 @@
        avalue = evalue;
        Var_Set(name, avalue, ctxt);
 
-       *out_avalue = avalue;
-       *out_avalue_freeIt = evalue;
+       *out_avalue = (FStr){ avalue, evalue };
 }
 
 static void
 VarAssign_EvalShell(const char *name, const char *uvalue, GNode *ctxt,
-                   const char **out_avalue, void **out_avalue_freeIt)
+                   FStr *out_avalue)
 {
        const char *cmd, *errfmt;
        char *cmdOut;
@@ -1978,7 +1977,7 @@
 
        cmdOut = Cmd_Exec(cmd, &errfmt);
        Var_Set(name, cmdOut, ctxt);
-       *out_avalue = *out_avalue_freeIt = cmdOut;
+       *out_avalue = FStr_InitOwn(cmdOut);
 
        if (errfmt != NULL)
                Parse_Error(PARSE_WARNING, errfmt, cmd);
@@ -1996,31 +1995,25 @@
  * skipped if the operator is '?=' and the variable already exists. */
 static Boolean
 VarAssign_Eval(const char *name, VarAssignOp op, const char *uvalue,
-              GNode *ctxt, const char **out_avalue, void **out_avalue_freeIt)
+              GNode *ctxt, FStr *out_TRUE_avalue)
 {
-       const char *avalue = uvalue;
-       void *avalue_freeIt = NULL;
+       FStr avalue = FStr_InitRefer(uvalue);
 
        if (op == VAR_APPEND)
                Var_Append(name, uvalue, ctxt);
        else if (op == VAR_SUBST)
-               VarAssign_EvalSubst(name, uvalue, ctxt, &avalue,
-                   &avalue_freeIt);
+               VarAssign_EvalSubst(name, uvalue, ctxt, &avalue);
        else if (op == VAR_SHELL)
-               VarAssign_EvalShell(name, uvalue, ctxt, &avalue,
-                   &avalue_freeIt);
+               VarAssign_EvalShell(name, uvalue, ctxt, &avalue);
        else {
-               if (op == VAR_DEFAULT && Var_Exists(name, ctxt)) {
-                       *out_avalue_freeIt = NULL;
+               if (op == VAR_DEFAULT && Var_Exists(name, ctxt))
                        return FALSE;
-               }
 
                /* Normal assignment -- just do it. */
                Var_Set(name, uvalue, ctxt);
        }
 
-       *out_avalue = avalue;
-       *out_avalue_freeIt = avalue_freeIt;
+       *out_TRUE_avalue = avalue;
        return TRUE;
 }
 
@@ -2047,15 +2040,14 @@
 void
 Parse_DoVar(VarAssign *var, GNode *ctxt)
 {
-       const char *avalue;     /* actual value (maybe expanded) */
-       void *avalue_freeIt;
+       FStr avalue;    /* actual value (maybe expanded) */
 
        VarCheckSyntax(var->op, var->value, ctxt);
-       if (VarAssign_Eval(var->varname, var->op, var->value, ctxt,
-           &avalue, &avalue_freeIt))
-               VarAssignSpecial(var->varname, avalue);
-
-       free(avalue_freeIt);
+       if (VarAssign_Eval(var->varname, var->op, var->value, ctxt, &avalue)) {
+               VarAssignSpecial(var->varname, avalue.str);
+               FStr_Done(&avalue);
+       }
+
        free(var->varname);
 }