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Get the current position of a stream
#include <stdio.h>
int fgetpos( FILE* fp,
fpos_t* pos );
- fp
- The stream whose position you want to determine.
- pos
- A pointer to a fpos_t object where the function can
store the position.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The fgetpos() function stores the current position of the stream
fp in the fpos_t object specified by pos.
You can use the value stored in pos in a call to
fsetpos()
if you want to reposition the file to the position at the time of the
fgetpos() call.
0 for success, or nonzero if an error occurs
(errno is set).
#include <stdio.h>
#include <stdlib.h>
int main( void )
{
FILE *fp;
fpos_t position;
char buffer[80];
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 );
return EXIT_SUCCESS;
}
return EXIT_FAILURE;
}
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
errno,
fopen(),
fseek(),
fsetpos(),
ftell()
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