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80 lines
2 KiB
C
80 lines
2 KiB
C
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/* @(#)fcons.c 2.20 10/11/06 Copyright 1986, 1995-2010 J. Schilling */
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/*
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* Copyright (c) 1986, 1995-2010 J. Schilling
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*/
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/*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* See the file CDDL.Schily.txt in this distribution for details.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file CDDL.Schily.txt from this distribution.
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*/
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#include "schilyio.h"
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/*
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* Note that because of a definition in schilyio.h we are using
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* fseeko()/ftello() instead of fseek()/ftell() if available.
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*/
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LOCAL char *fmtab[] = {
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"", /* 0 FI_NONE */
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"r", /* 1 FI_READ */
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"w", /* 2 FI_WRITE **1) */
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"r+", /* 3 FI_READ | FI_WRITE */
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"b", /* 4 FI_NONE | FI_BINARY */
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"rb", /* 5 FI_READ | FI_BINARY */
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"wb", /* 6 FI_WRITE | FI_BINARY **1) */
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"r+b", /* 7 FI_READ | FI_WRITE | FI_BINARY */
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/* + FI_APPEND */ "", /* 0 FI_NONE */
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/* ... */ "r", /* 1 FI_READ */
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"a", /* 2 FI_WRITE **1) */
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"a+", /* 3 FI_READ | FI_WRITE */
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"b", /* 4 FI_NONE | FI_BINARY */
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"rb", /* 5 FI_READ | FI_BINARY */
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"ab", /* 6 FI_WRITE | FI_BINARY **1) */
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"a+b", /* 7 FI_READ | FI_WRITE | FI_BINARY */
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};
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/*
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* NOTES:
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* 1) fdopen() guarantees not to create/trunc files in this case
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*
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* "w" will create/trunc files with fopen()
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* "a" will create files with fopen()
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*/
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EXPORT FILE *
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_fcons(fd, f, flag)
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register FILE *fd;
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int f;
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int flag;
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{
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int my_gflag = _io_glflag;
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if (fd == (FILE *)NULL)
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fd = fdopen(f,
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fmtab[flag&(FI_READ|FI_WRITE|FI_BINARY | FI_APPEND)]);
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if (fd != (FILE *)NULL) {
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if (flag & FI_APPEND) {
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(void) fseek(fd, (off_t)0, SEEK_END);
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}
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if (flag & FI_UNBUF) {
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setbuf(fd, NULL);
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my_gflag |= _JS_IOUNBUF;
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}
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set_my_flag(fd, my_gflag); /* must clear it if fd is reused */
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return (fd);
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}
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if (flag & FI_CLOSE)
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close(f);
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return ((FILE *)NULL);
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}
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