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LibC: Add putgrent

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This commit is contained in:
M4x1m3 2021-07-09 14:32:12 +02:00 • committed by Gunnar Beutner
parent 2eb93f2628
commit 927f6ea221
2 changed files with 45 additions and 0 deletions
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43
Userland/Libraries/LibC/grp.cpp
View file

@ -1,11 +1,13 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Maxime Friess <M4x1me@pm.me>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/String.h>
#include <AK/Vector.h>
#include <errno.h>
#include <errno_numbers.h>
#include <grp.h>
#include <stdio.h>
@ -159,4 +161,45 @@ int initgroups(const char* user, gid_t extra_gid)
gids[count++] = extra_gid;
return setgroups(count, gids);
}
int putgrent(const struct group* group, FILE* stream)
{
if (!group || !stream || !group->gr_name || !group->gr_passwd) {
errno = EINVAL;
return -1;
}
auto is_valid_field = [](const char* str) {
return str && !strpbrk(str, ":\n");
};
if (!is_valid_field(group->gr_name) || !is_valid_field(group->gr_passwd)) {
errno = EINVAL;
return -1;
}
int nwritten = fprintf(stream, "%s:%s:%u:", group->gr_name, group->gr_passwd, group->gr_gid);
if (!nwritten || nwritten < 0) {
errno = ferror(stream);
return -1;
}
if (group->gr_mem) {
for (size_t i = 0; group->gr_mem[i] != nullptr; i++) {
nwritten = fprintf(stream, i == 0 ? "%s" : ",%s", group->gr_mem[i]);
if (!nwritten || nwritten < 0) {
errno = ferror(stream);
return -1;
}
}
}
nwritten = fprintf(stream, "\n");
if (!nwritten || nwritten < 0) {
errno = ferror(stream);
return -1;
}
return 0;
}
}

2
Userland/Libraries/LibC/grp.h
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Maxime Friess <M4x1me@pm.me>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -23,6 +24,7 @@ void setgrent();
void endgrent();
struct group* getgrnam(const char* name);
struct group* getgrgid(gid_t);
int putgrent(const struct group*, FILE*);
int initgroups(const char* user, gid_t);