92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
/* @(#)filereopen.c 1.18 10/11/06 Copyright 1986, 1995-2010 J. Schilling */
|
|
/*
|
|
* open new file on old stream
|
|
*
|
|
* Copyright (c) 1986, 1995-2010 J. Schilling
|
|
*/
|
|
/*
|
|
* The contents of this file are subject to the terms of the
|
|
* Common Development and Distribution License, Version 1.0 only
|
|
* (the "License"). You may not use this file except in compliance
|
|
* with the License.
|
|
*
|
|
* See the file CDDL.Schily.txt in this distribution for details.
|
|
*
|
|
* When distributing Covered Code, include this CDDL HEADER in each
|
|
* file and include the License file CDDL.Schily.txt from this distribution.
|
|
*/
|
|
|
|
#include "schilyio.h"
|
|
|
|
/*
|
|
* Note that because of a definition in schilyio.h we are using
|
|
* fseeko()/ftello() instead of fseek()/ftell() if available.
|
|
*/
|
|
|
|
LOCAL char *fmtab[] = {
|
|
"", /* 0 FI_NONE */
|
|
"r", /* 1 FI_READ */
|
|
"r+", /* 2 FI_WRITE **1) */
|
|
"r+", /* 3 FI_READ | FI_WRITE */
|
|
"b", /* 4 FI_NONE | FI_BINARY */
|
|
"rb", /* 5 FI_READ | FI_BINARY */
|
|
"r+b", /* 6 FI_WRITE | FI_BINARY **1) */
|
|
"r+b", /* 7 FI_READ | FI_WRITE | FI_BINARY */
|
|
|
|
/* + FI_APPEND */ "", /* 0 FI_NONE */
|
|
/* ... */ "r", /* 1 FI_READ */
|
|
"a", /* 2 FI_WRITE **1) */
|
|
"a+", /* 3 FI_READ | FI_WRITE */
|
|
"b", /* 4 FI_NONE | FI_BINARY */
|
|
"rb", /* 5 FI_READ | FI_BINARY */
|
|
"ab", /* 6 FI_WRITE | FI_BINARY **1) */
|
|
"a+b", /* 7 FI_READ | FI_WRITE | FI_BINARY */
|
|
};
|
|
/*
|
|
* NOTES:
|
|
* 1) there is no fopen() mode that opens for writing
|
|
* without creating/truncating at the same time.
|
|
*
|
|
* "w" will create/trunc files with fopen()
|
|
* "a" will create files with fopen()
|
|
*/
|
|
|
|
EXPORT FILE *
|
|
filereopen(name, mode, fp)
|
|
const char *name;
|
|
const char *mode;
|
|
FILE *fp;
|
|
{
|
|
int ret = -1;
|
|
int omode = 0;
|
|
int flag = 0;
|
|
|
|
if (!_cvmod(mode, &omode, &flag))
|
|
return ((FILE *)NULL);
|
|
|
|
/*
|
|
* create/truncate file if necessary
|
|
*/
|
|
if ((flag & (FI_CREATE | FI_TRUNC)) != 0) {
|
|
if ((ret = _openfd(name, omode)) < 0)
|
|
return ((FILE *)NULL);
|
|
close(ret);
|
|
}
|
|
|
|
fp = freopen(name,
|
|
fmtab[flag & (FI_READ | FI_WRITE | FI_BINARY | FI_APPEND)], fp);
|
|
|
|
if (fp != (FILE *)NULL) {
|
|
set_my_flag(fp, 0); /* must clear it if fp is reused */
|
|
|
|
if (flag & FI_APPEND) {
|
|
(void) fseek(fp, (off_t)0, SEEK_END);
|
|
}
|
|
if (flag & FI_UNBUF) {
|
|
setbuf(fp, NULL);
|
|
add_my_flag(fp, _JS_IOUNBUF);
|
|
}
|
|
}
|
|
return (fp);
|
|
}
|