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Add ftello function

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This commit is contained in:
Erik van der Kouwe 2010-08-16 17:07:40 +00:00
parent a3e4dcafe0
commit 551374c228
3 changed files with 13 additions and 2 deletions
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1
include/stdio.h
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@ -120,6 +120,7 @@ _PROTOTYPE( int fseek, (FILE *_stream, long _offset, int _whence) );
_PROTOTYPE( int fseeko, (FILE *_stream, off_t _offset, int _whence) );
_PROTOTYPE( int fsetpos, (FILE *_stream, fpos_t *_pos) );
_PROTOTYPE( long ftell, (FILE *_stream) );
_PROTOTYPE( off_t ftello, (FILE *_stream) );
_PROTOTYPE( void rewind, (FILE *_stream) );
_PROTOTYPE( void clearerr, (FILE *_stream) );
_PROTOTYPE( int feof, (FILE *_stream) );

7
lib/libc/stdio/ftell.c
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@ -3,6 +3,7 @@
*/
/* $Header$ */
#include <assert.h>
#include <stdio.h>
#if (SEEK_CUR != 1) || (SEEK_SET != 0) || (SEEK_END != 2)
@ -16,6 +17,12 @@
off_t _lseek(int fildes, off_t offset, int whence);
long ftell(FILE *stream)
{
assert(sizeof(long) == sizeof(off_t));
return (long) ftello(stream);
}
off_t ftello(FILE *stream)
{
long result;
int adjust = 0;

7
man/man3/fseek.3
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@ -3,7 +3,7 @@
.TH FSEEK 3 "February 24, 1986"
.AT 3
.SH NAME
fseek, fseeko, ftell, rewind \- reposition a stream
fseek, fseeko, ftell, ftello, rewind \- reposition a stream
.SH SYNOPSIS
.nf
.ft B
@ -12,6 +12,7 @@ fseek, fseeko, ftell, rewind \- reposition a stream
int fseek(FILE *\fIstream\fP, long \fIoffset\fP, int \fIptrname\fP)
int fseeko(FILE *\fIstream\fP, off_t \fIoffset\fP, int \fIptrname\fP)
long ftell(FILE *\fIstream\fP)
off_t ftello(FILE *\fIstream\fP)
void rewind(FILE *\fIstream\fP)
.ft R
.fi
@ -37,7 +38,9 @@ undo any effects of
.BR ungetc (3).
.PP
.B Ftell
returns the current value of the offset relative to the beginning
and
.B ftello
return the current value of the offset relative to the beginning
of the file associated with the named
.IR stream .
It is measured in bytes on UNIX;