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/* simplified linux fopen.c
Copyright (C) 1995 Joel N. Weber II
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "stdio.h"
#include <malloc.h>
FILE * fopen(name, openmode)
char *name;
char *openmode;
{
FILE *new;
int openplus=0;
char basemode;
basemode = openmode[0];
while (openmode[0] != 0){
switch(openmode[0]){
case '+': openplus=1; break;
}
openmode++;
}
new = malloc(sizeof(new));
if( new == 0 ) return 0;
new->bufread = new->bufpos = new->bufstart = malloc(BUFSIZ);
if( new->bufstart == 0 ) { free(new) ; return 0; }
new->bufend = new->bufstart + BUFSIZ;
new->buffer_mode = _IOFBF;
new->iotrans = 0;
new->fd = -1;
if (openplus){
new->file_mode = _MODE_RDWR;
switch (basemode){
case 'a':
new->fd = open(name, O_RDWR | O_APPEND | O_CREAT);
break;
case 'r':
new->fd = open(name, O_RDWR);
break;
case 'w':
new->fd = open(name, O_RDWR | O_TRUNC | O_CREAT);
break;
}
} else switch (basemode){
case 'a':
new->fd = open(name, O_WRONLY | O_APPEND | O_CREAT);
new->file_mode = _MODE_WRITE;
break;
case 'r':
new->fd = open(name, O_RDONLY);
new->file_mode = _MODE_READ;
break;
case 'w':
new->fd = open(name, O_WRONLY | O_TRUNC | O_CREAT);
new->file_mode = _MODE_WRITE;
break;
}
if( new->fd < 0 )
{
free(new->bufstart);
free(new);
return 0;
}
return new;
}
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