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Declaration:
long int ftell(FILE *stream);
Returns the current file position of the given stream. If it is
a binary stream, then the value is the number of bytes from the
beginning of the file. If it is a text stream, then the value is
a value useable by the fseek function to return the file
position to the current position.
On success the current file position is returned. On error a
value of -1L is returned and errno
is set.
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