160 lines
2.9 KiB
C
160 lines
2.9 KiB
C
/* Reentrant versions of lseek system call. */
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#include <reent.h>
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#include <unistd.h>
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#include <_syslist.h>
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#include <errno.h>
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/* Some targets provides their own versions of this functions. Those
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targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS. */
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#ifdef _REENT_ONLY
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#ifndef REENTRANT_SYSCALLS_PROVIDED
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#define REENTRANT_SYSCALLS_PROVIDED
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#endif
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#endif
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#ifndef REENTRANT_SYSCALLS_PROVIDED
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#pragma pack(push, 1)
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typedef struct
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{
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char sec;
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char min;
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char hour;
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char rsv;
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}detime_t;
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typedef struct
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{
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char day;
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char month;
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short year;
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}dedate_t;
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typedef struct
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{
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unsigned attr;
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unsigned flags;
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union
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{
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detime_t ctime;
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unsigned cr_time;
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};
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union
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{
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dedate_t cdate;
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unsigned cr_date;
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};
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union
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{
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detime_t atime;
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unsigned acc_time;
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};
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union
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{
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dedate_t adate;
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unsigned acc_date;
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};
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union
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{
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detime_t mtime;
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unsigned mod_time;
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};
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union
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{
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dedate_t mdate;
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unsigned mod_date;
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};
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unsigned size;
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unsigned size_high;
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} FILEINFO;
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#pragma pack(pop)
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extern unsigned __NFiles;
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#define __handle_check( __h, __r ) \
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if( (__h) < 0 || (__h) > __NFiles ) { \
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ptr->_errno = EBADF ; \
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return( __r ); \
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}
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/*
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FUNCTION
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<<_lseek_r>>---Reentrant version of lseek
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INDEX
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_lseek_r
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ANSI_SYNOPSIS
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#include <reent.h>
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off_t _lseek_r(struct _reent *<[ptr]>,
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int <[fd]>, off_t <[pos]>, int <[whence]>);
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TRAD_SYNOPSIS
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#include <reent.h>
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off_t _lseek_r(<[ptr]>, <[fd]>, <[pos]>, <[whence]>)
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struct _reent *<[ptr]>;
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int <[fd]>;
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off_t <[pos]>;
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int <[whence]>;
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DESCRIPTION
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This is a reentrant version of <<lseek>>. It
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takes a pointer to the global data block, which holds
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<<errno>>.
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*/
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_off_t
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_DEFUN (_lseek_r, (ptr, fd, pos, whence),
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struct _reent *ptr _AND
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int fd _AND
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_off_t pos _AND
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int whence)
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{
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_off_t ret;
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__file_handle *fh;
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__handle_check( fd, -1 );
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fh = (__file_handle*) __getOSHandle( fd );
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switch(whence)
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{
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case SEEK_SET:
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ret = pos;
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break;
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case SEEK_CUR:
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ret = fh->offset + pos;
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break;
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case SEEK_END:
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{
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FILEINFO info;
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get_fileinfo(fh->name, &info);
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ret = pos + info.size;
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break;
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}
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default:
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ptr->_errno = EINVAL;
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return -1;
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};
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fh->offset = ret;
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return( ret );
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}
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_off_t
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_DEFUN (lseek, (fd, pos, whence),
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int fd _AND
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_off_t pos _AND
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int whence)
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{
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return _lseek_r(_REENT, fd, pos, whence);
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};
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#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */
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