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.\" Copyright 2023, F5, Inc.
.\" Author: Alejandro Colomar <alx@nginx.com>
.
.TH zlibVersion 3 (date) "zlib (unreleased)"
.
.SH Name
zlibVersion
\-
get version of the zlib runtime library
.
.SH Library
zlib compression library
.RI ( zlib ", " \-lz )
.
.SH Synopsis
.nf
.B #include <zlib.h>
.PP
.B const char *zlibVersion(void);
.PP
.BR "#define ZLIB_VERSION" " /* ... */"
.fi
.
.SH Description
.MR zlibVersion 3
can be called by the application to
compare the version of the runtime library
with the version of the header file used at compilation
.RB \%( ZLIB_VERSION ).
If the major version (the first character) differs,
the runtime library is not compatible with the header file.
This check is performed automatically by
.MR deflateInit 3
and
.MR inflateInit 3 .
.
.SH Return value
A static string similar to
.IR \[dq]1.2.13.1-motley\[dq] .
.
.SH Errors
None.
.
.SH Examples
.EX
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
\&
#include <zlib.h>
\&
int
main(void)
{
printf("zlib header version: %s\en", ZLIB_VERSION);
printf("zlib runtime version: %s\en", zlibVersion());
\&
if (ZLIB_VERSION[0] != zlibVersion()[0])
errx(EXIT_FAILURE, "incompatible zlib runtime version");
\&
exit(EXIT_SUCCESS);
}
.EE
.
.SH See also
.MR zlib 3 .
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