|FSEEK(3)||Library Functions Manual||FSEEK(3)|
*stream, long int
* restrict stream, fpos_t
* restrict pos);
* restrict stream, const
fpos_t * restrict pos);
fseek() function sets the file position indicator for the stream pointed to by stream. The new position, measured in bytes, is obtained by adding offset bytes to the position specified by whence. If whence is set to
SEEK_END, the offset is relative to the start of the file, the current position indicator, or end-of-file, respectively. A successful call to the
fseek() function clears the end-of-file indicator for the stream and undoes any effects of the ungetc(3) function on the same stream.
fseeko() function is identical to the
fseek() function except that the
offset argument is of type
ftell() function obtains the current
value of the file position indicator for the stream pointed to by
ftello() function is identical to the
ftell() function except that the return value is of
rewind() function sets the file
position indicator for the stream pointed to by stream
to the beginning of the file. It is equivalent to:
(void)fseek(stream, 0L, SEEK_SET)
except that the error indicator for the stream is also cleared (see clearerr(3)).
In this implementations, an
“fpos_t” object is a complex object that
represents both the position and the parse state of the stream making these
routines are the only way to portably reposition a text stream. The
pos argument of
always be initialized by a call to
rewind() function returns no value. Upon successful completion,
fsetpos() return 0. The functions
ftello() return the current offset. Otherwise,
ftello() return -1 while
fsetpos() return a nonzero value. On error all functions the global variable errno is set to indicate the error. Since the
rewind() function does not return an error code, applications need to clear errno before calling it in order to detect errors.
fseek() was not
ftell(), the current file offset cannot be represented correctly in an object of type long.
also fail and set errno for any of the errors
specified for the routines
rewind() functions conform to ANSI X3.159-1989 (“ANSI C89”). The
ftello() functions conform to X/Open System Interfaces and Headers Issue 5 (“XSH5”).
fsetpos() functions don't store/set shift states of the stream in this implementation.
|January 21, 2012||NetBSD-7.0.1|