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make(1): add comments for ModifyWord_Subst

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Without any comments, the code is unnecessarily hard to follow.
This commit is contained in:
rillig 2020-08-29 12:48:17 +00:00
parent 0f5754839c
commit 123d5708b5
1 changed files with 6 additions and 3 deletions
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9
usr.bin/make/var.c
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@ -1,4 +1,4 @@
/* $NetBSD: var.c,v 1.475 2020/08/29 12:27:10 rillig Exp $ */
/* $NetBSD: var.c,v 1.476 2020/08/29 12:48:17 rillig Exp $ */
/*
* Copyright (c) 1988, 1989, 1990, 1993
@ -69,14 +69,14 @@
*/
#ifndef MAKE_NATIVE
static char rcsid[] = "$NetBSD: var.c,v 1.475 2020/08/29 12:27:10 rillig Exp $";
static char rcsid[] = "$NetBSD: var.c,v 1.476 2020/08/29 12:48:17 rillig Exp $";
#else
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)var.c 8.3 (Berkeley) 3/19/94";
#else
__RCSID("$NetBSD: var.c,v 1.475 2020/08/29 12:27:10 rillig Exp $");
__RCSID("$NetBSD: var.c,v 1.476 2020/08/29 12:48:17 rillig Exp $");
#endif
#endif /* not lint */
#endif
@ -1297,9 +1297,11 @@ ModifyWord_Subst(const char *word, SepBuf *buf, void *data)
if (wordLen != args->lhsLen)
goto nosub;
/* :S,^whole$,replacement, */
SepBuf_AddBytes(buf, args->rhs, args->rhsLen);
args->matched = TRUE;
} else {
/* :S,^prefix,replacement, */
SepBuf_AddBytes(buf, args->rhs, args->rhsLen);
SepBuf_AddBytes(buf, word + args->lhsLen, wordLen - args->lhsLen);
args->matched = TRUE;
@ -1317,6 +1319,7 @@ ModifyWord_Subst(const char *word, SepBuf *buf, void *data)
if (memcmp(start, args->lhs, args->lhsLen) != 0)
goto nosub;
/* :S,suffix$,replacement, */
SepBuf_AddBytesBetween(buf, word, start);
SepBuf_AddBytes(buf, args->rhs, args->rhsLen);
args->matched = TRUE;