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/*
* fopen.c
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
/* This depends on O_RDONLY == 0, O_WRONLY == 1, O_RDWR == 2 */
FILE *fopen(const char *file, const char *mode)
{
int flags = O_RDONLY;
int plus = 0;
int fd;
while ( *mode ) {
switch ( *mode ) {
case 'r':
flags = O_RDONLY;
break;
case 'w':
flags = O_WRONLY|O_CREAT|O_TRUNC;
break;
case 'a':
flags = O_WRONLY|O_CREAT|O_APPEND;
break;
case '+':
plus = 1;
break;
}
mode++;
}
if ( plus ) {
flags = (flags & ~(O_RDONLY|O_WRONLY)) | O_RDWR;
}
fd = open(file, flags, 0666);
if ( fd < 0 )
return NULL;
else
return fdopen(fd, mode);
}
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