diff options
Diffstat (limited to 'posix/id.c')
| -rw-r--r-- | posix/id.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/posix/id.c b/posix/id.c new file mode 100644 index 0000000..d886e68 --- /dev/null +++ b/posix/id.c @@ -0,0 +1,173 @@ +/* Copyright (C) 1991 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <ansidecl.h> +#include <stdio.h> +#include <unistd.h> +#include <stdlib.h> +#include <grp.h> +#include <pwd.h> +#include <limits.h> +#include <sys/types.h> + + +static void +DEFUN(print_grpname, (id, parens), + gid_t id AND int parens) +{ + CONST struct group *CONST g = getgrgid(id); + if (g == NULL) + { + if (parens) + return; + else + { + fprintf(stderr, "Couldn't find name for group %d\n", id); + exit(EXIT_FAILURE); + } + } + + if (parens) + printf("(%s)", g->gr_name); + else + puts(g->gr_name); +} + +static void +DEFUN(print_pwdname, (id, parens), + uid_t id AND int parens) +{ + CONST struct passwd *CONST p = getpwuid(id); + if (p == NULL) + { + if (parens) + return; + else + { + fprintf(stderr, "Couldn't find name for user %d\n", (int) id); + exit(EXIT_FAILURE); + } + } + + if (parens) + printf("(%s)", p->pw_name); + else + puts(p->pw_name); +} + +int +DEFUN(main, (argc, argv), int argc AND char **argv) +{ + int print_gid = 1, print_uid = 1; + int real = 0, name = 0; + int error = 0; + register int c; + + uid_t ruid = getuid(), euid = geteuid(); + gid_t rgid = getgid(), egid = getegid(); + + while ((c = getopt(argc, argv, "gurn")) != -1) + switch (c) + { + default: + error = 1; + break; + + case 'g': + print_gid = 1; + print_uid = 0; + break; + + case 'u': + print_uid = 1; + print_gid = 0; + break; + + case 'r': + real = 1; + break; + + case 'n': + name = 1; + break; + } + + if (error || argc != optind) + { + fputs("Usage: id [-gurn]\n", stderr); + exit(EXIT_FAILURE); + } + + if (print_uid && !print_gid) + { + CONST uid_t uid = real ? ruid : euid; + if (name) + print_pwdname(uid, 0); + else + printf("%d\n", (int) uid); + } + else if (print_gid && !print_uid) + { + CONST gid_t gid = real ? rgid : egid; + if (name) + print_grpname(gid, 0); + else + printf("%d\n", (int) gid); + } + else + { +#if NGROUPS_MAX > 0 + gid_t groups[NGROUPS_MAX]; + int ngroups; + ngroups = getgroups(NGROUPS_MAX, groups); +#endif + + printf("uid=%d", (int) ruid); + print_pwdname(ruid, 1); + printf(" gid=%d", (int) rgid); + print_grpname(rgid, 1); + if (euid != ruid) + { + printf(" euid=%d", (int) euid); + print_pwdname(euid, 1); + } + if (egid != rgid) + { + printf(" egid=%d", (int) egid); + print_grpname(egid, 1); + } + +#if NGROUPS > 0 + if (ngroups > 0) + { + register size_t i; + printf(" groups=%d", (int) groups[0]); + print_grpname(groups[0], 1); + for (i = 1; i < ngroups; ++i) + { + printf(", %d", (int) groups[i]); + print_grpname(groups[i], 1); + } + } +#endif + + putchar('\n'); + } + + exit(EXIT_SUCCESS); +} |