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/***************************************************************
SYS-OPEN.C
This file contains Linux/i386/ILP32 implementation of
__cpu_sys_open().
PART OF : CPU - library .
USAGE : Internal only .
Copyright (C) 2026 by Andrew V.Kosteltsev.
All Rights Reserved.
***************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <libmcpu.h>
#include <cpu-sysdeps.h>
static int
__cpu_open_flags( __mpu_uint64_t flags, int *host_flags )
{
int f = 0;
if( !host_flags ) return( __MCPU_EINVAL );
if( flags & ~(__mpu_uint64_t)__CPU_O_SUPPORTED ) return( __MCPU_EINVAL );
switch( flags & __CPU_O_ACCMODE )
{
case __CPU_O_RDONLY: f |= O_RDONLY; break;
case __CPU_O_WRONLY: f |= O_WRONLY; break;
case __CPU_O_RDWR: f |= O_RDWR; break;
default: return( __MCPU_EINVAL );
}
if( flags & __CPU_O_CREAT ) f |= O_CREAT;
if( flags & __CPU_O_EXCL ) f |= O_EXCL;
if( flags & __CPU_O_NOCTTY ) f |= O_NOCTTY;
if( flags & __CPU_O_TRUNC ) f |= O_TRUNC;
if( flags & __CPU_O_APPEND ) f |= O_APPEND;
if( flags & __CPU_O_NONBLOCK ) f |= O_NONBLOCK;
*host_flags = f;
return( 0 );
} /* End of __cpu_open_flags() */
static int
__cpu_open_mode( __mpu_uint64_t mode, mode_t *host_mode )
{
mode_t m = 0;
if( !host_mode ) return( __MCPU_EINVAL );
if( mode & ~(__mpu_uint64_t)__CPU_S_SUPPORTED ) return( __MCPU_EINVAL );
if( mode & __CPU_S_ISUID ) m |= S_ISUID;
if( mode & __CPU_S_ISGID ) m |= S_ISGID;
#ifdef S_ISVTX
if( mode & __CPU_S_ISVTX ) m |= S_ISVTX;
#endif
if( mode & __CPU_S_IRUSR ) m |= S_IRUSR;
if( mode & __CPU_S_IWUSR ) m |= S_IWUSR;
if( mode & __CPU_S_IXUSR ) m |= S_IXUSR;
if( mode & __CPU_S_IRGRP ) m |= S_IRGRP;
if( mode & __CPU_S_IWGRP ) m |= S_IWGRP;
if( mode & __CPU_S_IXGRP ) m |= S_IXGRP;
if( mode & __CPU_S_IROTH ) m |= S_IROTH;
if( mode & __CPU_S_IWOTH ) m |= S_IWOTH;
if( mode & __CPU_S_IXOTH ) m |= S_IXOTH;
*host_mode = m;
return( 0 );
} /* End of __cpu_open_mode() */
__mpu_int64_t
__cpu_sys_open( int dirfd, const char *path, __mpu_uint64_t flags,
__mpu_uint64_t mode )
{
mode_t host_mode = 0;
int host_flags;
int error;
int fd;
if( !path ) return( -(__mpu_int64_t)__MCPU_EFAULT );
error = __cpu_open_flags( flags, &host_flags );
if( error ) return( -(__mpu_int64_t)error );
if( flags & __CPU_O_CREAT )
{
error = __cpu_open_mode( mode, &host_mode );
if( error ) return( -(__mpu_int64_t)error );
fd = openat( dirfd, path, host_flags, host_mode );
}
else
{
if( mode != 0 ) return( -(__mpu_int64_t)__MCPU_EINVAL );
fd = openat( dirfd, path, host_flags );
}
if( fd < 0 ) return( -(__mpu_int64_t)__cpu_errno_from_host( errno ) );
return( (__mpu_int64_t)fd );
} /* End of __cpu_sys_open() */
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