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# gztell

gztell -- tell gz-file pointer read/write position

## Description

`int gztell`(int zp);

Returns the position of the file pointer referenced by zp; i.e., its offset into the file stream.

If an error occurs, returns false.

The file pointer must be valid, and must point to a file successfully opened by gzopen().

See also gzopen(), gzseek() and gzrewind().

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