Import "getconf" as a UNIX utility
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2368fa4e02
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209
src/getconf.c
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209
src/getconf.c
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/* $Id$ */
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/* Copyright (c) 2020 Pierre Pronchery <khorben@defora.org> */
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/* This file is part of DeforaOS Unix utils */
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/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <limits.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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/* constants */
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#ifndef PROGNAME
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# define PROGNAME "getconf"
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#endif
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/* getconf */
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/* private */
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/* types */
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typedef struct _getconf_catalog
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{
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int name;
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char const * string;
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} getconf_catalog;
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/* constants */
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static const getconf_catalog _getconf_catalog_confstr[] =
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{
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#ifdef _CS_PATH
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{ _CS_PATH, "_CS_PATH" },
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#endif
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};
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static const getconf_catalog _getconf_catalog_limits[] =
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{
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#ifdef NGROUPS_MAX
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{ NGROUPS_MAX, "NGROUPS_MAX" },
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#endif
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};
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static const getconf_catalog _getconf_catalog_pathconf[] =
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{
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#ifdef _PC_FILESIZEBITS
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{ _PC_FILESIZEBITS, "FILESIZEBITS" },
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#endif
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#ifdef _PC_LINK_MAX
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{ _PC_LINK_MAX, "LINK_MAX" },
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#endif
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#ifdef _PC_MAX_CANON
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{ _PC_MAX_CANON, "MAX_CANON" },
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#endif
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#ifdef _PC_MAX_INPUT
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{ _PC_MAX_INPUT, "MAX_INPUT" },
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#endif
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#ifdef _PC_NAME_MAX
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{ _PC_NAME_MAX, "NAME_MAX" },
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#endif
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#ifdef _PC_PATH_MAX
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{ _PC_PATH_MAX, "PATH_MAX" },
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#endif
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#ifdef _PC_PIPE_BUF
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{ _PC_PIPE_BUF, "PIPE_BUF" },
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#endif
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};
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/* prototypes */
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static int _getconf(char const * specification, char const * var,
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char const * path);
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static int _getconf_error(char const * message, int ret);
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static int _usage(void);
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/* functions */
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/* getconf */
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static int _getconf_confstr(char const * var);
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static int _getconf_limits(char const * var);
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static int _getconf_pathconf(char const * var, char const * path);
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static int _getconf(char const * specification, char const * var,
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char const * path)
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{
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if(path != NULL)
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return _getconf_pathconf(var, path);
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if(strncmp(var, "_SC_", 4) == 0)
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return _getconf_confstr(var);
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return _getconf_limits(var);
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}
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static int _getconf_confstr(char const * var)
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{
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size_t i;
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size_t cnt = sizeof(_getconf_catalog_confstr)
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/ sizeof(*_getconf_catalog_confstr);
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char * buf;
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for(i = 0; i < cnt; i++)
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if(strcmp(_getconf_catalog_confstr[i].string, var) == 0)
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break;
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if(i == cnt)
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return _getconf_error(var, -ENOENT);
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/* obtain the required size */
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if((cnt = confstr(_getconf_catalog_confstr[i].name, NULL, 0)) == 0)
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return _getconf_error(var, 2);
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if((buf = malloc(cnt)) == NULL)
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return _getconf_error(var, 2);
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if((cnt = confstr(_getconf_catalog_confstr[i].name, buf, cnt)) == 0)
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{
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free(buf);
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return _getconf_error(var, 2);
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}
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printf("%s\n", buf);
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free(buf);
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return 0;
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}
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static int _getconf_limits(char const * var)
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{
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size_t i;
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size_t cnt = sizeof(_getconf_catalog_limits)
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/ sizeof(*_getconf_catalog_limits);
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for(i = 0; i < cnt; i++)
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if(strcmp(_getconf_catalog_limits[i].string, var) == 0)
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break;
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if(i == cnt)
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return _getconf_error(var, -ENOENT);
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printf("%d\n", _getconf_catalog_limits[i].name);
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return 0;
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}
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static int _getconf_pathconf(char const * var, char const * path)
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{
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size_t i;
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size_t cnt = sizeof(_getconf_catalog_pathconf)
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/ sizeof(*_getconf_catalog_pathconf);
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long value;
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for(i = 0; i < cnt; i++)
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if(strcmp(_getconf_catalog_pathconf[i].string, var) == 0)
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break;
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if(i == cnt)
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return _getconf_error(var, -ENOENT);
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if((value = pathconf(path, _getconf_catalog_pathconf[i].name)) < 0)
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return _getconf_error(var, 2);
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printf("%ld\n", value);
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return 0;
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}
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/* error */
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static int _getconf_error(char const * message, int ret)
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{
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fputs(PROGNAME ": ", stderr);
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if(ret < 0)
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{
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fprintf(stderr, "%s%s%s\n", (message != NULL) ? message : "",
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(message != NULL) ? ": " : "", strerror(-ret));
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return -ret;
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}
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perror(message);
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return ret;
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}
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/* usage */
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static int _usage(void)
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{
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fputs("Usage: " PROGNAME " [-v specification] system_var\n"
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" " PROGNAME " [-v specification] path_var pathname\n", stderr);
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return 1;
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}
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/* main */
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int main(int argc, char * argv[])
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{
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int o;
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char const * specification = NULL;
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while((o = getopt(argc, argv, "v:")) != -1)
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switch(o)
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{
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case 'v':
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specification = optarg;
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break;
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default:
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return _usage();
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}
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if(optind + 1 != argc && optind + 2 != argc)
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return _usage();
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return (_getconf(specification, argv[optind], argv[optind + 1]) == 0)
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? 0 : 2;
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}
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@ -1,4 +1,4 @@
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targets=basename,cat,chgrp,chmod,chown,cksum,cmp,cp,date,df,dirname,du,echo,false,file,find,grep,head,id,kill,link,ln,locale,logname,ls,mkdir,mkfifo,more,mv,nice,pr,printf,ps,pwd,renice,rm,rmdir,sleep,strings,tail,test,time,touch,true,tty,uname,uniq,unlink,wc,who
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targets=basename,cat,chgrp,chmod,chown,cksum,cmp,cp,date,df,dirname,du,echo,false,file,find,getconf,grep,head,id,kill,link,ln,locale,logname,ls,mkdir,mkfifo,more,mv,nice,pr,printf,ps,pwd,renice,rm,rmdir,sleep,strings,tail,test,time,touch,true,tty,uname,uniq,unlink,wc,who
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cflags=-W -Wall -g -O2 -fPIE -D_FORTIFY_SOURCE=2 -fstack-protector
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ldflags=-pie -Wl,-z,relro -Wl,-z,now
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dist=Makefile,common.c
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@ -87,6 +87,11 @@ type=binary
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sources=find.c
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install=$(BINDIR)
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[getconf]
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type=binary
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sources=getconf.c
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install=$(BINDIR)
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[grep]
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type=binary
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sources=grep.c
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