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