FSEEK(3F)FSEEK(3F)NAME
fseek, ftell - reposition a file on a logical unit
SYNOPSIS
integer function fseek (lunit, offset, from)
integer offset, from
integer function ftell (lunit)
DESCRIPTION
lunit must refer to an open logical unit. offset is an offset in bytes relative to the position specified by from. Valid values for from
are:
0 meaning `beginning of the file'
1 meaning `the current position'
2 meaning `the end of the file'
The value returned by fseek will be 0 if successful, a system error code otherwise. (See perror(3F))
Ftell returns the current position of the file associated with the specified logical unit. The value is an offset, in bytes, from the
beginning of the file. If the value returned is negative, it indicates an error and will be the negation of the system error code. (See
perror(3F))
FILES
/usr/lib/libU77.a
SEE ALSO fseek(3S), perror(3F)4.2 Berkeley Distribution May 27, 1986 FSEEK(3F)
Check Out this Related Man Page
FSEEK(3) Linux Programmer's Manual FSEEK(3)NAME
fgetpos, fseek, fsetpos, ftell, rewind - reposition a stream
SYNOPSIS
#include <stdio.h>
int fseek(FILE *stream, long offset, int whence);
long ftell(FILE *stream);
void rewind(FILE *stream);
int fgetpos(FILE *stream, fpos_t *pos);
int fsetpos(FILE *stream, fpos_t *pos);
DESCRIPTION
The 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_SET, SEEK_CUR, or 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.
The ftell function obtains the current value of the file position indicator for the stream pointed to by stream.
The 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)).
The fgetpos and fsetpos functions are alternate interfaces equivalent to ftell and fseek (with whence set to SEEK_SET), setting and storing
the current value of the file offset into or from the object referenced by pos. On some non-UNIX systems an fpos_t object may be a complex
object and these routines may be the only way to portably reposition a text stream.
RETURN VALUE
The rewind function returns no value. Upon successful completion, fgetpos, fseek, fsetpos return 0, and ftell returns the current offset.
Otherwise, -1 is returned and the global variable errno is set to indicate the error.
ERRORS
EBADF The stream specified is not a seekable stream.
EINVAL The whence argument to fseek was not SEEK_SET, SEEK_END, or SEEK_CUR.
The function fgetpos, fseek, fsetpos, and ftell may also fail and set errno for any of the errors specified for the routines fflush(3),
fstat(2), lseek(2), and malloc(3).
CONFORMING TO
The fgetpos, fsetpos, fseek, ftell, and rewind functions conform to ANSI X3.159-1989 (``ANSI C'').
SEE ALSO lseek(2), fseeko(3)BSD MANPAGE 1993-11-29 FSEEK(3)
The errors EBADF & ESPIPE occur at this fseek call. Does anybody know how to solve this problem? Thanks in advance.
toFileStream=fdopen(localFileDes,"ra+");
if(fseek(toFileStream, 0, SEEK_END)!=0){
if(errno==EBADF)
printf("errno==EBADF\n");
if(errno==EINVAL)... (3 Replies)
In determining the true file size of a .tga file is the
fseek(fptr,0,SEEK_END);
file_size = ftell(fptr);
combination reliable ? The reason Im asking is because the value of file_size is in agreement with doing a
wc -c mytga.tga
however when I get the value of the extension... (2 Replies)
Hi,
I working a c project in IBM AIX. I have a requirement like this.
I have some contents in *temp. I am writing the contents of *temp to a file pointer ftemp (*ftemp for an tmp file tmpfile.txt)
Now I want to read the contents of *ftemp in the reverse order an dneed to print it in the... (2 Replies)
this is my code and no matter what record number the user enters i cant get any of the records fields to read into the structure acct. What am i doing wrong?
#include <stdio.h>
typedef struct
{
char name;
int number;
float balance;
} acct_info_t;
int main (int... (0 Replies)