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Implement getpwuid_r

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Clément Fréville
2023-06-05 11:22:36 +02:00
parent 94c1a3ed9f
commit 0aa3349aa3
1 changed files with 28 additions and 0 deletions
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28
fakeid.c
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@@ -38,6 +38,9 @@ struct passwd *getpwuid(uid_t uid) {
return NULL;
}
struct passwd *pass = getpwuid(uid);
if (pass == NULL) {
return NULL;
}
char *name = getenv("USER");
if (name == NULL) {
fprintf(stderr, "Could not find the USER environment variable. Using the real username.\n");
@@ -46,3 +49,28 @@ struct passwd *getpwuid(uid_t uid) {
pass->pw_name = name;
return pass;
}
int getpwuid_r(uid_t uid, struct passwd *pw, char *buf, size_t size, struct passwd **res) {
int prev_err = errno;
*res = NULL;
struct passwd *pass = getpwuid(uid);
if (pass == NULL || errno != prev_err) {
return errno;
}
memcpy(pw, pass, sizeof(struct passwd));
size_t name_len = strlen(pass->pw_name) + 1;
size_t passwd_len = strlen(pass->pw_passwd) + 1;
size_t gecos_len = strlen(pass->pw_gecos) + 1;
size_t dir_len = strlen(pass->pw_dir) + 1;
size_t shell_len = strlen(pass->pw_shell) + 1;
if ((name_len + passwd_len + gecos_len + dir_len + shell_len) > size) {
return ERANGE;
}
pw->pw_name = memcpy(buf, pass->pw_name, name_len);
pw->pw_passwd = memcpy(buf + name_len, pass->pw_passwd, passwd_len);
pw->pw_gecos = memcpy(buf + name_len + passwd_len, pass->pw_gecos, gecos_len);
pw->pw_dir = memcpy(buf + name_len + passwd_len + gecos_len, pass->pw_dir, dir_len);
pw->pw_shell = memcpy(buf + name_len + passwd_len + gecos_len + dir_len, pass->pw_shell, shell_len);
*res = pw;
return 0;
}