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cc65/libsrc/common/_fopen.c

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/*
* _fopen.c
*
* Ullrich von bassewitz, 17.06.1997
*/
#include <fcntl.h>
#include <errno.h>
#include "_file.h"
static unsigned char amode_to_bmode (const char* mode)
/* Convert ASCII mode (like for fopen) to binary mode (for open) */
{
char c;
char flag = 0;
unsigned char binmode = 0;
while (c = *mode++) {
switch(c) {
case 'w':
binmode = O_WRONLY;
break;
case 'r':
binmode = O_RDONLY;
break;
case '+':
binmode = O_RDWR;
break;
/* a,b missing */
}
}
if (binmode == 0) {
_errno = EINVAL;
}
return binmode;
}
FILE* _fopen (const char* name, const char* mode, FILE* f)
/* Open the specified file and fill the descriptor values into f */
{
int fd;
unsigned char binmode;
/* Convert ASCII mode to binary mode */
if ((binmode = amode_to_bmode (mode)) == 0) {
/* Invalid mode, _errno already set */
return 0;
}
/* Open the file */
fd = open (name, binmode);
if (fd == -1) {
/* Error - _oserror is set */
return 0;
}
/* Remember fd, mark the file as opened */
f->f_fd = fd;
f->f_flags = _FOPEN;
/* Return the file descriptor */
return f;
}