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LibC: Implement putpwent()

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It was previously impossible to (correctly) put an entry into the
password file via libc. This patch implements the functionality
to do so.
This commit is contained in:
Jesse Buhagiar 2020-01-12 19:03:21 +11:00 committed by Andreas Kling
parent dfaa5ecf81
commit 5f78e2ff3a
Notes: sideshowbarker 2024-07-19 09:42:21 +09:00 
Author: https://github.com/Quaker762
Commit: https://github.com/SerenityOS/serenity/commit/5f78e2ff3ab
Pull-request: https://github.com/SerenityOS/serenity/pull/1059
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/bugaevc
2 changed files with 27 additions and 0 deletions
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25
Libraries/LibC/pwd.cpp
View file

@ -151,4 +151,29 @@ next_entry:
strncpy(__pwdb_entry->shell_buffer, e_shell.characters(), PWDB_STR_MAX_LEN);
return __pwdb_entry;
}
int putpwent(const struct passwd* p, FILE* stream)
{
if (!p || !stream || !p->pw_name || !p->pw_dir || !p->pw_gecos || !p->pw_shell) {
errno = EINVAL;
return -1;
}
auto is_valid_field = [](const char* str) {
return str && !strpbrk(str, ":\n");
};
if (!is_valid_field(p->pw_name) || !is_valid_field(p->pw_dir) || !is_valid_field(p->pw_gecos) || !is_valid_field(p->pw_shell)) {
errno = EINVAL;
return -1;
}
int nwritten = fprintf(stream, "%s:x:%u:%u:%s,,,:%s:%s\n", p->pw_name, p->pw_uid, p->pw_gid, p->pw_gecos, p->pw_dir, p->pw_shell);
if (!nwritten || nwritten < 0) {
errno = ferror(stream);
return -1;
}
return 0;
}
}

2
Libraries/LibC/pwd.h
View file

@ -26,6 +26,7 @@
#pragma once
#include <bits/FILE.h>
#include <sys/cdefs.h>
#include <sys/types.h>
@ -46,5 +47,6 @@ void setpwent();
void endpwent();
struct passwd* getpwnam(const char* name);
struct passwd* getpwuid(uid_t);
int putpwent(const struct passwd* p, FILE* stream);
__END_DECLS