C89 and POSIX.1-2001 define signal(2) as returning a pointer to a
function returning 'void'. K&R C signal(2) signature is obsolete.
Use 'void' directly.
Also, instead of writing the function pointer type explicitly, use
POSIX's 'sighandler_t'.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Systems on which <sys/time.h> conflicted with <time.h> are obsolete.
This macro has been marked as obsolete by autoconf documentation.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
All current compilers support C89's 'const' keyword.
Autoconf declares this macro as obsolescent.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
As autoconf documentation says, this macro is obsolescent, as no
current systems have the bug in S_ISDIR, S_ISREG, etc..
The affected systems were Tektronix UTekV, Amdahl UTS, and
Motorola System V/88.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
INTERACTIVE Systems Corporation Unix is no longer sold, and Sun
said (long ago) that it would drop support for it on 2006-07-23.
So this macro has been obsolete for more than a decade.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
'mode_t' is defined by POSIX.1-2001 in <sys/types.h>.
It's unlikely to be missing.
See mode_t(3).
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
'pid_t' is defined by POSIX.1-2001 in <sys/types.h>.
It's unlikely to be missing.
See pid_t(3).
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
'off_t' is defined by POSIX.1-2001 in <sys/types.h>.
It's unlikely to be missing.
See off_t(3).
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
'uid_t' is defined by POSIX.1-2001 in <sys/types.h>.
It's unlikely to be missing.
See uid_t(3).
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
The macro HAVE_RUSEROK is not being used anywhere.
As the Linux manual page says, ruserok(3) is present on the BDSs, Solaris, and many other systems. This function appeared in 4.2BSD. So we probably can rely on its existence.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
The macro HAVE_GETADDRINFO is not being used anywhere.
BTW, the function is defined by POSIX.1-2001 and RFC 2553, so it's likely that it is always available.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
The macro HAVE_SIGACTION is not being used anywhere.
BTW, the function is defined by SVr4 and POSIX.1-2001, so it's likely that it is always available.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
The macro HAVE_GETTIMEOFDAY is not being used anywhere.
BTW, the function is defined by SVr4, 4.3BSD, and POSIX.1-2001, so
it's likely that it is always available.
POSIX.1-2008 marks it as obsolete, but only because
clock_gettime(2) provides more precission. Since gettimeofday(3)
is in use by many big projects, and it has no obvious dangers,
it's likely that it will continue to exist even if it's outside of
the POSIX standard.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
The macro HAVE_GETHOSTNAME is not being used anywhere.
BTW, the function is defined by SVr4, 4.4BSD, and POSIX.1-2001, so
it's likely that it is always available.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
The only place where the check was used was removed in 4e1afcd66.
BTW, it was unnecessary, since strchr(3) is defined by:
POSIX.1-2001, C89, SVr4, and 4.3BSD. Enough to rely on it.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
GNU autoconf documentation marks this macro as obsolescent, as
current systems are compatible with POSIX.
Simplify code to unconditionally include <sys/wait.h>, and don't
redefine WIFEXITSTATUS() and WIFEXITED(), since they are mandated
by POSIX.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
POSIX.1-2001 defines 'struct dirent' in <dirent.h>. It replaces
the old 'struct direct' found in BSDs. All of the systems that I
checked (including FreeBSD, NetBSD, and OpenBSD), now provide
<dirent.h> with 'struct dirent', as mandated by POSIX.
Since autoconf first checks <dirent.h> and only if it's missing it
checks other header files, it's clear that it will always find
<dirent.h>, so let's simplify.
GNU autoconf documentation declares this macro as obsolescent, and
acknowledges that all current systems with directory libraries
have <dirent.h>:
<https://www.gnu.org/software/autoconf/manual/autoconf-2.70/html_node/Particular-Headers.html>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Compilers are allowed to and do optimize memset(3) calls away for
pointers not accessed in the future. Since the memzero wrappers purpose
is exactly to unconditionally override memory (e.g. for stored
passwords) do not implement via regular memset(3), but via either
memset_s(3), explicit_bzero(3) or a hand written implementation using
volatile pointers.
See https://wiki.sei.cmu.edu/confluence/display/c/MSC06-C.+Beware+of+compiler+optimizations
run_part() and run_parts() do not modify their directory, name and
action arguments.
Also include the header in the implementation to provide the prototypes.
useradd.c:2495:59: warning: cast discards ‘const’ qualifier from pointer target type [-Wcast-qual]
2495 | if (run_parts ("/etc/shadow-maint/useradd-pre.d", (char*)user_name,
| ^
useradd.c:2495:24: warning: passing argument 1 of ‘run_parts’ discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
2495 | if (run_parts ("/etc/shadow-maint/useradd-pre.d", (char*)user_name,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from useradd.c:45:
../lib/run_part.h:2:22: note: expected ‘char *’ but argument is of type ‘const char *’
2 | int run_parts (char *directory, char *name, char *action);
| ~~~~~~^~~~~~~~~
useradd.c:2496:25: warning: passing argument 3 of ‘run_parts’ discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
2496 | "useradd")) {
| ^~~~~~~~~
nss_init() does not modify its path argument, thus declare it const.
Also drop superfluous prototype.
nss.c:54:31: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
54 | nsswitch_path = NSSWITCH;
| ^
Function declarations with no argument declare functions taking an
arbitrary number of arguments. Use the special type void to declare
functions taking no argument.
C89 defined isdigit as a function that tests for any decimal-digit
character, defining the decimal digits as 0 1 2 3 4 5 6 7 8 9.
I don't own a copy of C89 to check, but check in C17:
7.4.1.5
5.2.1
More specifically:
> In both the source and execution basic character sets, the value
> of each character after 0 in the above list of decimal digits
> shall be one greater than the value of the previous.
And since in ascii(7), the character after '9' is ':', it's highly
unlikely that any implementation will ever accept any
_decimal digit_ other than 0..9.
POSIX simply defers to the ISO C standard.
This is exactly what we wanted from ISDIGIT(c), so just use it.
Non-standard implementations might have been slower or considered
other characters as digits in the past, but let's assume
implementations available today conform to ISO C89.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
It wasn't being used at all. Let's remove it.
Use isdigit(3) directly in comments that referenced it.
Also, in those comments, remove an outdated reference to the fact
that ISDIGIT_LOCALE(c) might evaluate its argument more than once,
which could be true a few commits ago, until
IN_CTYPE_DEFINITION(c) was removed. Previously, the definition
for ISDIGIT_LOCALE(c) was:
#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
# define IN_CTYPE_DOMAIN(c) 1
#else
# define IN_CTYPE_DOMAIN(c) isascii(c)
#endif
#define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
Which could evaluate 'c' twice on pre-C89 systems (which I hope
don't exist nowadays).
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Due to the recent removal of IN_CTYPE_DOMAIN(), the uppercase
macros that wrapped these standard calls are now defined to be
equivalent. Therefore, there's no need for the wrappers, and it
is much more readable to use the standard calls directly.
However, hold on with ISDIGIT*(), since it's not so obvious what
to do with it.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
The recent removal of STDC_HEADERS made IN_CTYPE_DOMAIN be defined
to 1 unconditionally. Remove the now unnecessary definition, and
propagate its truthness to expressions where it was used.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
We're in 2021. C89 is everywhere; in fact, there are many other
assumptions in the code that wouldn't probably hold on
pre-standard C environments. Let's simplify and assume that C89
is available.
The specific assumptions are that:
- <string.h>, and <stdlib.h> are available
- strchr(3), strrchr(3), and strtok(3) are available
- isalpha(3), isspace(3), isdigit(3), and isupper(3) are available
I think we can safely assume we have all of those.
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
