1c464d9a2d
- Set errno = 0 before the call. Otherwise, it may contain anything. - ERANGE is not the only possible errno value of these functions. They can also set it to EINVAL. - Any errno value after these calls is bad; just compare against 0. - Don't check for the return value; just errno. This function is guaranteed to not modify errno on success (POSIX). - Check endptr == str, which may or may not set EINVAL. Suggested-by: Iker Pedrosa <ipedrosa@redhat.com> Signed-off-by: Alejandro Colomar <alx@kernel.org>
44 lines
1019 B
C
44 lines
1019 B
C
/*
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* SPDX-FileCopyrightText: 1991 - 1994, Julianne Frances Haugh
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* SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
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* SPDX-FileCopyrightText: 2000 - 2006, Tomasz Kłoczko
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* SPDX-FileCopyrightText: 2007 - 2009, Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#ident "$Id$"
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#include <stdlib.h>
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#include <errno.h>
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#include <grp.h>
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#include "prototypes.h"
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/*
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* getgr_nam_gid - Return a pointer to the group specified by a string.
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* The string may be a valid GID or a valid groupname.
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* If the group does not exist on the system, NULL is returned.
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*/
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extern /*@only@*//*@null@*/struct group *getgr_nam_gid (/*@null@*/const char *grname)
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{
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long long gid;
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char *endptr;
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if (NULL == grname) {
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return NULL;
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}
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errno = 0;
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gid = strtoll(grname, &endptr, 10);
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if ( ('\0' != *grname)
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&& ('\0' == *endptr)
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&& (0 == errno)
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&& (/*@+longintegral@*/gid == (gid_t)gid)/*@=longintegral@*/) {
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return xgetgrgid (gid);
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}
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return xgetgrnam (grname);
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}
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