|Linux Standard Base Core Specification 4.0|
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The gzgetc() function shall read the next single character from the compressed file stream referenced by file, which shall have been opened in a read mode (see gzopen() and gzdopen()).
On success, gzgetc() shall return the uncompressed character read, otherwise, on end of file or error, gzgetc() shall return -1.
On end of file or error, gzgetc() shall return -1. Further information can be found by calling gzerror() with a pointer to the compressed file stream.
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