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checkTag.c - Version validation tool for LZ4
Copyright (C) Yann Collet 2018 - present
GPL v2 License
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
You can contact the author at :
- LZ4 homepage :
- LZ4 source repo :
/* checkTag command :
* $ ./checkTag tag
* checkTag validates tags of following format : v[0-9].[0-9].[0-9]{any}
* The tag is then compared to LZ4 version number.
* They are compatible if first 3 digits are identical.
* Anything beyond that is free, and doesn't impact validation.
* Example : tag v1.8.1.2 is compatible with version 1.8.1
* When tag and version are not compatible, program exits with error code 1.
* When they are compatible, it exists with a code 0.
* checkTag is intended to be used in automated testing environment.
#include <stdio.h> /* printf */
#include <string.h> /* strlen, strncmp */
#include "lz4.h" /* LZ4_VERSION_STRING */
/* validate() :
* @return 1 if tag is compatible, 0 if not.
static int validate(const char* const tag)
size_t const tagLength = strlen(tag);
size_t const verLength = strlen(LZ4_VERSION_STRING);
if (tagLength < 2) return 0;
if (tag[0] != 'v') return 0;
if (tagLength <= verLength) return 0;
if (strncmp(LZ4_VERSION_STRING, tag+1, verLength)) return 0;
return 1;
int main(int argc, const char** argv)
const char* const exeName = argv[0];
const char* const tag = argv[1];
if (argc!=2) {
printf("incorrect usage : %s tag \n", exeName);
return 2;
printf("Version : %s \n", LZ4_VERSION_STRING);
printf("Tag : %s \n", tag);
if (validate(tag)) {
printf("OK : tag is compatible with lz4 version \n");
return 0;
printf("!! error : tag and versions are not compatible !! \n");
return 1;