hush/libbb/die_if_bad_username.c
Denis Vlasenko defc1ea340 *: introduce and use FAST_FUNC: regparm on i386, otherwise no-on
text    data     bss     dec     hex filename
 808035     611    6868  815514   c719a busybox_old
 804472     611    6868  811951   c63af busybox_unstripped
2008-06-27 02:52:20 +00:00

37 lines
910 B
C

/* vi: set sw=4 ts=4: */
/*
* Ckeck user and group names for illegal characters
*
* Copyright (C) 2008 Tito Ragusa <farmatito@tiscali.it>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
/* To avoid problems, the username should consist only of
* letters, digits, underscores, periods, at signs and dashes,
* and not start with a dash (as defined by IEEE Std 1003.1-2001).
* For compatibility with Samba machine accounts $ is also supported
* at the end of the username.
*/
void FAST_FUNC die_if_bad_username(const char *name)
{
goto skip; /* 1st char being dash isn't valid */
do {
if (*name == '-')
continue;
skip:
if (isalnum(*name)
|| *name == '_'
|| *name == '.'
|| *name == '@'
|| (*name == '$' && !*(name + 1))
) {
continue;
}
bb_error_msg_and_die("illegal character '%c'", *name);
} while (*++name);
}