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#include <stdio.h>
#include <sys/types.h>
#include <pwd.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
static struct passwd pw_passwd; /* password structure */
static FILE *passwd_fp;
static char logname[8];
static char password[1024];
static char comment[1024];
static char gecos[1024];
static char dir[1024];
static char shell[1024];
int getpwnam_r(
const char *name,
struct passwd *pwd,
char *buffer,
size_t bufsize,
struct passwd **result
)
{
FILE *fp;
if ((fp = fopen ("/etc/passwd", "r")) == NULL) {
errno = EINVAL;
return -1;
}
while (fgets (buffer, bufsize, fp)) {
sscanf (buffer, "%[^:]:%[^:]:%d:%d:%[^:]:%[^:]:%s\n",
logname, password, &pwd->pw_uid,
&pwd->pw_gid, comment, gecos,
dir, shell);
pwd->pw_name = logname;
pwd->pw_passwd = password;
pwd->pw_comment = comment;
pwd->pw_gecos = gecos;
pwd->pw_dir = dir;
pwd->pw_shell = shell;
if (!strcmp (logname, name)) {
fclose (fp);
*result = pwd;
return 0;
}
}
fclose (fp);
errno = EINVAL;
return -1;
}
struct passwd *getpwnam(
const char *name
)
{
char buf[1024];
struct passwd *p;
if ( getpwnam_r( name, &pw_passwd, buf, 1024, &p ) )
return NULL;
return p;
}
int getpwuid_r(
uid_t uid,
struct passwd *pwd,
char *buffer,
size_t bufsize,
struct passwd **result
)
{
FILE *fp;
if ((fp = fopen ("/etc/passwd", "r")) == NULL) {
errno = EINVAL;
return -1;
}
while (fgets (buffer, bufsize, fp)) {
sscanf (buffer, "%[^:]:%[^:]:%d:%d:%[^:]:%[^:]:%s\n",
logname, password, &pw_passwd.pw_uid,
&pw_passwd.pw_gid, comment, gecos,
dir, shell);
pwd->pw_name = logname;
pwd->pw_passwd = password;
pwd->pw_comment = comment;
pwd->pw_gecos = gecos;
pwd->pw_dir = dir;
pwd->pw_shell = shell;
if (uid == pwd->pw_uid) {
fclose (fp);
*result = pwd;
return 0;
}
}
fclose (fp);
errno = EINVAL;
return -1;
}
struct passwd *getpwuid(
uid_t uid
)
{
char buf[1024];
struct passwd *p;
if ( getpwuid_r( uid, &pw_passwd, buf, 1024, &p ) )
return NULL;
return p;
}
struct passwd *getpwent()
{
char buf[1024];
if (passwd_fp == NULL)
return NULL;
if (fgets (buf, sizeof (buf), passwd_fp) == NULL)
return NULL;
sscanf (buf, "%[^:]:%[^:]:%d:%d:%[^:]:%[^:]:%s\n",
logname, password, &pw_passwd.pw_uid,
&pw_passwd.pw_gid, comment, gecos,
dir, shell);
pw_passwd.pw_name = logname;
pw_passwd.pw_passwd = password;
pw_passwd.pw_comment = comment;
pw_passwd.pw_gecos = gecos;
pw_passwd.pw_dir = dir;
pw_passwd.pw_shell = shell;
return &pw_passwd;
}
void setpwent( void )
{
if (passwd_fp != NULL)
fclose (passwd_fp);
passwd_fp = fopen ("/etc/passwd", "r");
}
void endpwent( void )
{
if (passwd_fp != NULL)
fclose (passwd_fp);
}
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