Mercurial > hg > toybox
view toys/posix/id.c @ 818:264b9da809df
Simplify license text, as mentioned on the mailing list.
Reasoning: it was never my intent to require anybody to copy license
text into another project if they cut and pasted something out of
toybox. The "permission for any purpose" is as close to public domain
as you can get in our current screwed up legal system without making
people uncomfortable the _other_ way. (Besides, my initial reading of
that was "all copies of the source code" but that's not what it says,
and somebody pointed out that Android has "show license text" options
because paranoid lawyers think that sort of thing applies to the BINARY
version, which is nuts.)
author | Rob Landley <rob@landley.net> |
---|---|
date | Thu, 14 Mar 2013 09:02:37 -0500 |
parents | 50052f1368b9 |
children | 7b2e8f9db29b |
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/* id.c - print real and effective user and group IDs * * Copyright 2012 Sony Network Entertainment, Inc. * * by Tim Bird <tim.bird@am.sony.com> * * See http://opengroup.org/onlinepubs/9699919799/utilities/id.html USE_ID(NEWTOY(id, ">1nGgru[!Ggu]", TOYFLAG_BIN)) config ID bool "id" default y help usage: id [-nGgru] Print user and group ID. -n print names instead of numeric IDs (to be used with -Ggu) -G Show only the group IDs -g Show only the effective group ID -r Show real ID instead of effective ID -u Show only the effective user ID */ #define FOR_id #include "toys.h" static void s_or_u(char *s, unsigned u, int done) { if (toys.optflags & FLAG_n) printf("%s", s); else printf("%u", u); if (done) { xputc('\n'); exit(0); } } static void showid(char *header, unsigned u, char *s) { printf("%s%u(%s)", header, u, s); } struct passwd *xgetpwuid(uid_t uid) { struct passwd *pwd = getpwuid(uid); if (!pwd) error_exit(NULL); return pwd; } struct group *xgetgrgid(gid_t gid) { struct group *group = getgrgid(gid); if (!group) error_exit(NULL); return group; } void id_main(void) { int flags = toys.optflags, i, ngroups; struct passwd *pw; struct group *grp; uid_t uid = getuid(), euid = geteuid(); gid_t gid = getgid(), egid = getegid(), *groups; // check if a username is given if (*toys.optargs) { if (!(pw = getpwnam(*toys.optargs))) error_exit("no such user '%s'", *toys.optargs); uid = euid = pw->pw_uid; gid = egid = pw->pw_gid; } i = toys.optflags & FLAG_r; pw = xgetpwuid(i ? uid : euid); if (flags & FLAG_u) s_or_u(pw->pw_name, pw->pw_uid, 1); grp = xgetgrgid(i ? gid : egid); if (flags & FLAG_g) s_or_u(grp->gr_name, grp->gr_gid, 1); if (!(flags & FLAG_G)) { showid("uid=", pw->pw_uid, pw->pw_name); showid(" gid=", grp->gr_gid, grp->gr_name); if (!i) { if (uid != euid) { pw = xgetpwuid(euid); showid(" euid=", pw->pw_uid, pw->pw_name); } if (gid != egid) { grp = xgetgrgid(egid); showid(" egid=", grp->gr_gid, grp->gr_name); } } showid(" groups=", grp->gr_gid, grp->gr_name); } groups = (gid_t *)toybuf; i = sizeof(toybuf)/sizeof(gid_t); ngroups = *toys.optargs ? getgrouplist(*toys.optargs, gid, groups, &i) : getgroups(i, groups); if (0 >= ngroups) perror_exit(0); for (i = 0;;) { if (!(grp = getgrgid(groups[i]))) perror_msg(0); else if (flags & FLAG_G) s_or_u(grp->gr_name, grp->gr_gid, 0); else if (grp->gr_gid != egid) showid("", grp->gr_gid, grp->gr_name); if (++i >= ngroups) break; xputc(' '); } xputc('\n'); }