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long align records written to temporary files.

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This commit is contained in:
dsl 2009-10-07 21:03:29 +00:00
parent 5aa782f502
commit 8b6ec7b129
1 changed files with 16 additions and 8 deletions
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24
usr.bin/sort/files.c
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@ -1,4 +1,4 @@
/* $NetBSD: files.c,v 1.39 2009/09/28 20:30:01 dsl Exp $ */
/* $NetBSD: files.c,v 1.40 2009/10/07 21:03:29 dsl Exp $ */
/*-
* Copyright (c) 2000-2003 The NetBSD Foundation, Inc.
@ -65,12 +65,15 @@
#include "fsort.h"
#ifndef lint
__RCSID("$NetBSD: files.c,v 1.39 2009/09/28 20:30:01 dsl Exp $");
__RCSID("$NetBSD: files.c,v 1.40 2009/10/07 21:03:29 dsl Exp $");
__SCCSID("@(#)files.c 8.1 (Berkeley) 6/6/93");
#endif /* not lint */
#include <string.h>
/* Align records in temporary files to avoid misaligned copies */
#define REC_ROUNDUP(n) (((n) + sizeof (long) - 1) & ~(sizeof (long) - 1))
static ssize_t seq(FILE *, u_char **);
/*
@ -226,7 +229,7 @@ seq(FILE *fp, u_char **line)
void
putrec(const RECHEADER *rec, FILE *fp)
{
EWRITE(rec, 1, offsetof(RECHEADER, data) + rec->length, fp);
EWRITE(rec, 1, REC_ROUNDUP(offsetof(RECHEADER, data) + rec->length), fp);
}
/*
@ -244,7 +247,7 @@ putline(const RECHEADER *rec, FILE *fp)
void
putkeydump(const RECHEADER *rec, FILE *fp)
{
EWRITE(rec, 1, offsetof(RECHEADER, data) + rec->offset, fp);
EWRITE(rec, 1, REC_ROUNDUP(offsetof(RECHEADER, data) + rec->offset), fp);
}
/*
@ -253,19 +256,24 @@ putkeydump(const RECHEADER *rec, FILE *fp)
int
geteasy(FILE *fp, RECHEADER *rec, u_char *end, struct field *dummy2)
{
length_t file_len;
int i;
(void)sizeof (char[offsetof(RECHEADER, length) == 0 ? 1 : -1]);
if ((u_char *)(rec + 1) > end)
return (BUFFEND);
if (!fread(rec, 1, offsetof(RECHEADER, data), fp)) {
if (!fread(&rec->length, 1, sizeof rec->length, fp)) {
fclose(fp);
return (EOF);
}
if (end - rec->data < (ptrdiff_t)rec->length) {
for (i = offsetof(RECHEADER, data) - 1; i >= 0; i--)
file_len = REC_ROUNDUP(offsetof(RECHEADER, data) + rec->length);
if (end - rec->data < (ptrdiff_t)file_len) {
for (i = sizeof rec->length - 1; i >= 0; i--)
ungetc(*((char *) rec + i), fp);
return (BUFFEND);
}
fread(rec->data, rec->length, 1, fp);
fread(&rec->length + 1, file_len - sizeof rec->length, 1, fp);
return (0);
}