reactos/sdk/tools/mkisofs/schilytools/libschily/stdio/fcons.c

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/* @(#)fcons.c 2.20 10/11/06 Copyright 1986, 1995-2010 J. Schilling */
/*
* 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 */
"w", /* 2 FI_WRITE **1) */
"r+", /* 3 FI_READ | FI_WRITE */
"b", /* 4 FI_NONE | FI_BINARY */
"rb", /* 5 FI_READ | FI_BINARY */
"wb", /* 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) fdopen() guarantees not to create/trunc files in this case
*
* "w" will create/trunc files with fopen()
* "a" will create files with fopen()
*/
EXPORT FILE *
_fcons(fd, f, flag)
register FILE *fd;
int f;
int flag;
{
int my_gflag = _io_glflag;
if (fd == (FILE *)NULL)
fd = fdopen(f,
fmtab[flag&(FI_READ|FI_WRITE|FI_BINARY | FI_APPEND)]);
if (fd != (FILE *)NULL) {
if (flag & FI_APPEND) {
(void) fseek(fd, (off_t)0, SEEK_END);
}
if (flag & FI_UNBUF) {
setbuf(fd, NULL);
my_gflag |= _JS_IOUNBUF;
}
set_my_flag(fd, my_gflag); /* must clear it if fd is reused */
return (fd);
}
if (flag & FI_CLOSE)
close(f);
return ((FILE *)NULL);
}