HelenOS sources

ext4_version_parse   47 uspace/app/mkext4/mkext4.c static errno_t ext4_version_parse(const char *, ext4_cfg_ver_t *);
ext4_version_parse  123 uspace/app/mkext4/mkext4.c 			rc = ext4_version_parse(*argv, &cfg.version);
HelenOS homepage, sources at GitHub