fgetpos.gml

来自「开放源码的编译器open watcom 1.6.0版的源代码」· GML 代码 · 共 45 行

.func fgetpos
#include <stdio.h>
int fgetpos( FILE *fp, fpos_t *pos );
.ixfunc2 '&StrIo' &func
.funcend
.desc begin
The &func function stores the current position of the file
.arg fp
in the object pointed to by
.arg pos.
The value stored is usable by the
.kw fsetpos
function for repositioning the file to its position at the time of the
call to the &func function.
.desc end
.return begin
The &func function returns zero if successful, otherwise, the
&func function returns a non-zero value.
.im errnoref
.return end
.see begin
.seelist fgetpos fopen fseek fsetpos ftell
.see end
.exmp begin
#include <stdio.h>

void main()
  {
    FILE *fp;
    fpos_t position;
    auto char buffer[80];
.exmp break
    fp = fopen( "file", "r" );
    if( fp != NULL ) {
      fgetpos( fp, &position ); /* get position     */
      fgets( buffer, 80, fp );  /* read record      */
      fsetpos( fp, &position ); /* set position     */
      fgets( buffer, 80, fp );  /* read same record */
      fclose( fp );
    }
  }
.exmp end
.class ANSI
.system