[src/trunk]: src/usr.bin/make make(1): remove unnecessary NULL marker from fu...

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

details:   https://anonhg.NetBSD.org/src/rev/d30541a868df
branches:  trunk
changeset: 945928:d30541a868df
user:      rillig <rillig%NetBSD.org@localhost>
date:      Tue Nov 10 07:40:30 2020 +0000

description:
make(1): remove unnecessary NULL marker from functions list

Comparing the pointer works equally well and uses less memory.

diffstat:

 usr.bin/make/cond.c |  22 +++++++++++-----------
 1 files changed, 11 insertions(+), 11 deletions(-)

diffs (65 lines):

diff -r 289b2ad1f65f -r d30541a868df usr.bin/make/cond.c
--- a/usr.bin/make/cond.c       Tue Nov 10 07:39:12 2020 +0000
+++ b/usr.bin/make/cond.c       Tue Nov 10 07:40:30 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cond.c,v 1.198 2020/11/09 00:07:06 rillig Exp $        */
+/*     $NetBSD: cond.c,v 1.199 2020/11/10 07:40:30 rillig Exp $        */
 
 /*
  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
@@ -93,7 +93,7 @@
 #include "dir.h"
 
 /*     "@(#)cond.c     8.2 (Berkeley) 1/2/94"  */
-MAKE_RCSID("$NetBSD: cond.c,v 1.198 2020/11/09 00:07:06 rillig Exp $");
+MAKE_RCSID("$NetBSD: cond.c,v 1.199 2020/11/10 07:40:30 rillig Exp $");
 
 /*
  * The parsing of conditional expressions is based on this grammar:
@@ -726,37 +726,37 @@
        size_t fn_name_len;
        size_t (*fn_parse)(const char **, Boolean, const char *, char **);
        Boolean (*fn_eval)(size_t, const char *);
-    } fn_defs[] = {
+    } fns[] = {
        { "defined",  7, ParseFuncArg,  FuncDefined },
        { "make",     4, ParseFuncArg,  FuncMake },
        { "exists",   6, ParseFuncArg,  FuncExists },
        { "empty",    5, ParseEmptyArg, FuncEmpty },
        { "target",   6, ParseFuncArg,  FuncTarget },
-       { "commands", 8, ParseFuncArg,  FuncCommands },
-       { NULL,       0, NULL, NULL },
+       { "commands", 8, ParseFuncArg,  FuncCommands }
     };
-    const struct fn_def *fn_def;
+    const struct fn_def *fn;
     char *arg = NULL;
     size_t arglen;
     const char *cp = par->p;
+    const struct fn_def *fns_end = fns + sizeof fns / sizeof fns[0];
 
-    for (fn_def = fn_defs; fn_def->fn_name != NULL; fn_def++) {
-       if (!is_token(cp, fn_def->fn_name, fn_def->fn_name_len))
+    for (fn = fns; fn != fns_end; fn++) {
+       if (!is_token(cp, fn->fn_name, fn->fn_name_len))
            continue;
 
-       cp += fn_def->fn_name_len;
+       cp += fn->fn_name_len;
        cpp_skip_whitespace(&cp);
        if (*cp != '(')
            break;
 
-       arglen = fn_def->fn_parse(&cp, doEval, fn_def->fn_name, &arg);
+       arglen = fn->fn_parse(&cp, doEval, fn->fn_name, &arg);
        if (arglen == 0 || arglen == (size_t)-1) {
            par->p = cp;
            *out_token = arglen == 0 ? TOK_FALSE : TOK_ERROR;
            return TRUE;
        }
        /* Evaluate the argument using the required function. */
-       *out_token = ToToken(!doEval || fn_def->fn_eval(arglen, arg));
+       *out_token = ToToken(!doEval || fn->fn_eval(arglen, arg));
        free(arg);
        par->p = cp;
        return TRUE;