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Full Discussion: [c] How to calculate size of the file from size of the buffer?
Top Forums Programming [c] How to calculate size of the file from size of the buffer? Post 302656147 by jim mcnamara on Thursday 14th of June 2012 09:55:10 AM
Old 06-14-2012
It is not guaranteed to work. Use stat() to get a file size.
Code:
#include <sys/stat.h>
size_t filesize(int fd)
{
     struct stat st;
     if(fstat(fd, &st) == -1 )
     {
          perror("cannot stat file");
          exit(1);
      }
     return st.st_size;
}

void myfoo(void)
{
    size_t bytes;
    //.......... your code here
     bytes=filesize(fileno(fic_sortie));
    //.......  more code here
}

try something like that.
 

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LEARN ABOUT BSD

stat

STAT(3F)																  STAT(3F)

NAME

       stat, lstat, fstat - get file status

SYNOPSIS

       integer function stat (name, statb)
       character*(*) name
       integer statb(12)

       integer function lstat (name, statb)
       character*(*) name
       integer statb(12)

       integer function fstat (lunit, statb)
       integer statb(12)

DESCRIPTION

       These  routines	return	detailed  information  about a file.  Stat and lstat return information about file name; fstat returns information
       about the file associated with fortran logical unit lunit.  The order and meaning  of  the  information	returned  in  array  statb  is	as
       described for the structure stat under stat(2).	The ``spare'' values are not included.

       The value of either function will be zero if successful; an error code otherwise.

FILES

       /usr/lib/libU77.a

SEE ALSO

       stat(2), access(3F), perror(3F), time(3F)

BUGS

       Pathnames can be no longer than MAXPATHLEN as defined in <sys/param.h>.

4.2 Berkeley Distribution					   May 15, 1985 							  STAT(3F)
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