[src/trunk]: src/usr.bin/make make: in the ':Q' modifier, only allocate memor...

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

details:   https://anonhg.NetBSD.org/src/rev/9ee7ef627276
branches:  trunk
changeset: 961588:9ee7ef627276
user:      rillig <rillig%NetBSD.org@localhost>
date:      Mon Apr 12 13:28:35 2021 +0000

description:
make: in the ':Q' modifier, only allocate memory if necessary

diffstat:

 usr.bin/make/var.c |  48 +++++++++++++++++++++++++++---------------------
 1 files changed, 27 insertions(+), 21 deletions(-)

diffs (87 lines):

diff -r ddeee027e99b -r 9ee7ef627276 usr.bin/make/var.c
--- a/usr.bin/make/var.c        Mon Apr 12 12:22:10 2021 +0000
+++ b/usr.bin/make/var.c        Mon Apr 12 13:28:35 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: var.c,v 1.923 2021/04/11 22:53:45 rillig Exp $ */
+/*     $NetBSD: var.c,v 1.924 2021/04/12 13:28:35 rillig Exp $ */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -140,7 +140,7 @@
 #include "metachar.h"
 
 /*     "@(#)var.c      8.3 (Berkeley) 3/19/94" */
-MAKE_RCSID("$NetBSD: var.c,v 1.923 2021/04/11 22:53:45 rillig Exp $");
+MAKE_RCSID("$NetBSD: var.c,v 1.924 2021/04/12 13:28:35 rillig Exp $");
 
 /*
  * Variables are defined using one of the VAR=value assignments.  Their
@@ -1908,28 +1908,26 @@
  * Quote shell meta-characters and space characters in the string.
  * If quoteDollar is set, also quote and double any '$' characters.
  */
-static char *
-VarQuote(const char *str, bool quoteDollar)
+static void
+VarQuote(const char *str, bool quoteDollar, LazyBuf *buf)
 {
-       Buffer buf;
-       Buf_Init(&buf);
-
-       for (; *str != '\0'; str++) {
-               if (*str == '\n') {
+       const char *p;
+
+       LazyBuf_Init(buf, str);
+       for (p = str; *p != '\0'; p++) {
+               if (*p == '\n') {
                        const char *newline = Shell_GetNewline();
                        if (newline == NULL)
                                newline = "\\\n";
-                       Buf_AddStr(&buf, newline);
+                       LazyBuf_AddStr(buf, newline);
                        continue;
                }
-               if (ch_isspace(*str) || is_shell_metachar((unsigned char)*str))
-                       Buf_AddByte(&buf, '\\');
-               Buf_AddByte(&buf, *str);
-               if (quoteDollar && *str == '$')
-                       Buf_AddStr(&buf, "\\$");
+               if (ch_isspace(*p) || is_shell_metachar((unsigned char)*p))
+                       LazyBuf_Add(buf, '\\');
+               LazyBuf_Add(buf, *p);
+               if (quoteDollar && *p == '$')
+                       LazyBuf_AddStr(buf, "\\$");
        }
-
-       return Buf_DoneData(&buf);
 }
 
 /*
@@ -3068,14 +3066,22 @@
 static ApplyModifierResult
 ApplyModifier_Quote(const char **pp, ModChain *ch)
 {
-       bool quoteDollar = **pp == 'q';
+       LazyBuf buf;
+       bool quoteDollar;
+
+       quoteDollar = **pp == 'q';
        if (!IsDelimiter((*pp)[1], ch))
                return AMR_UNKNOWN;
        (*pp)++;
 
-       if (ModChain_ShouldEval(ch))
-               Expr_SetValueOwn(ch->expr,
-                   VarQuote(ch->expr->value.str, quoteDollar));
+       if (!ModChain_ShouldEval(ch))
+               return AMR_OK;
+
+       VarQuote(ch->expr->value.str, quoteDollar, &buf);
+       if (buf.data != NULL)
+               Expr_SetValue(ch->expr, LazyBuf_DoneGet(&buf));
+       else
+               LazyBuf_Done(&buf);
 
        return AMR_OK;
 }