forked from Bananymous/banan-os
113 lines
2.7 KiB
C++
113 lines
2.7 KiB
C++
|
#include <BAN/String.h>
|
||
|
#include <BAN/StringView.h>
|
||
|
#include <BAN/Vector.h>
|
||
|
|
||
|
#include <ctype.h>
|
||
|
#include <errno.h>
|
||
|
#include <pwd.h>
|
||
|
#include <stdio.h>
|
||
|
#include <stdlib.h>
|
||
|
#include <string.h>
|
||
|
|
||
|
static FILE* s_pwent_fp = nullptr;
|
||
|
static passwd s_pwent_struct;
|
||
|
|
||
|
#define TRY_LIBC(expr, ret) ({ auto&& e = expr; if (e.is_error()) { errno = e.error().get_error_code(); return ret; } e.release_value(); })
|
||
|
|
||
|
static bool open_pwent()
|
||
|
{
|
||
|
if (s_pwent_fp)
|
||
|
return true;
|
||
|
s_pwent_fp = fopen("/etc/passwd", "r");
|
||
|
return s_pwent_fp;
|
||
|
}
|
||
|
|
||
|
static void clear_pwent(passwd& passwd)
|
||
|
{
|
||
|
if (passwd.pw_name)
|
||
|
free(passwd.pw_name);
|
||
|
passwd.pw_name = nullptr;
|
||
|
if (passwd.pw_dir)
|
||
|
free(passwd.pw_dir);
|
||
|
passwd.pw_dir = nullptr;
|
||
|
if (passwd.pw_shell)
|
||
|
free(passwd.pw_shell);
|
||
|
passwd.pw_shell = nullptr;
|
||
|
}
|
||
|
|
||
|
void endpwent(void)
|
||
|
{
|
||
|
if (!s_pwent_fp)
|
||
|
return;
|
||
|
fclose(s_pwent_fp);
|
||
|
s_pwent_fp = nullptr;
|
||
|
clear_pwent(s_pwent_struct);
|
||
|
}
|
||
|
|
||
|
struct passwd* getpwent(void)
|
||
|
{
|
||
|
if (!s_pwent_fp)
|
||
|
if (!open_pwent())
|
||
|
return nullptr;
|
||
|
clear_pwent(s_pwent_struct);
|
||
|
|
||
|
BAN::String line;
|
||
|
while (true)
|
||
|
{
|
||
|
char buffer[128];
|
||
|
if (!fgets(buffer, sizeof(buffer), s_pwent_fp))
|
||
|
return nullptr;
|
||
|
TRY_LIBC(line.append(buffer), nullptr);
|
||
|
|
||
|
if (line.back() == '\n')
|
||
|
{
|
||
|
line.pop_back();
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
auto parts = TRY_LIBC(line.sv().split(':', true), nullptr);
|
||
|
ASSERT(parts.size() == 7);
|
||
|
|
||
|
ASSERT(1 <= parts[2].size() && parts[2].size() <= 9);
|
||
|
for (char c : parts[2])
|
||
|
ASSERT(isdigit(c));
|
||
|
ASSERT(1 <= parts[3].size() && parts[3].size() <= 9);
|
||
|
for (char c : parts[3])
|
||
|
ASSERT(isdigit(c));
|
||
|
|
||
|
s_pwent_struct.pw_uid = atoi(parts[2].data());
|
||
|
s_pwent_struct.pw_gid = atoi(parts[3].data());
|
||
|
|
||
|
s_pwent_struct.pw_name = (char*)malloc(parts[0].size() + 1);
|
||
|
if (!s_pwent_struct.pw_name)
|
||
|
return nullptr;
|
||
|
memcpy(s_pwent_struct.pw_name, parts[0].data(), parts[0].size());
|
||
|
s_pwent_struct.pw_name[parts[0].size()] = '\0';
|
||
|
|
||
|
s_pwent_struct.pw_dir = (char*)malloc(parts[5].size() + 1);
|
||
|
if (!s_pwent_struct.pw_dir)
|
||
|
return nullptr;
|
||
|
memcpy(s_pwent_struct.pw_dir, parts[5].data(), parts[5].size());
|
||
|
s_pwent_struct.pw_dir[parts[5].size()] = '\0';
|
||
|
|
||
|
s_pwent_struct.pw_shell = (char*)malloc(parts[6].size() + 1);
|
||
|
if (!s_pwent_struct.pw_shell)
|
||
|
return nullptr;
|
||
|
memcpy(s_pwent_struct.pw_shell, parts[6].data(), parts[6].size());
|
||
|
s_pwent_struct.pw_shell[parts[6].size()] = '\0';
|
||
|
|
||
|
return &s_pwent_struct;
|
||
|
}
|
||
|
|
||
|
struct passwd* getpwnam(const char* name);
|
||
|
int getpwnam_r(const char* name, struct passwd* pwd, char* buffer, size_t bufsize, struct passwd** result);
|
||
|
struct passwd* getpwuid(uid_t uid);
|
||
|
int getpwuid_r(uid_t uid, struct passwd* pwd, char* buffer, size_t bufsize, struct passwd** result);
|
||
|
|
||
|
void setpwent(void)
|
||
|
{
|
||
|
if (!s_pwent_fp)
|
||
|
return;
|
||
|
fseek(s_pwent_fp, 0, SEEK_SET);
|
||
|
}
|