/* passwd.c
 *
 * $Id$
 *
 * Copyright 1990, 1991, 1992, 1993, 1994, 1995, Oliver Laumann, Berlin
 * Copyright 2002, 2003 Sam Hocevar <sam@hocevar.net>, Paris
 *
 * This software was derived from Elk 1.2, which was Copyright 1987, 1988,
 * 1989, Nixdorf Computer AG and TELES GmbH, Berlin (Elk 1.2 has been written
 * by Oliver Laumann for TELES Telematic Services, Berlin, in a joint project
 * between TELES and Nixdorf Microprocessor Engineering, Berlin).
 *
 * Oliver Laumann, TELES GmbH, Nixdorf Computer AG and Sam Hocevar, as co-
 * owners or individual owners of copyright in this software, grant to any
 * person or company a worldwide, royalty free, license to
 *
 *    i) copy this software,
 *   ii) prepare derivative works based on this software,
 *  iii) distribute copies of this software or derivative works,
 *   iv) perform this software, or
 *    v) display this software,
 *
 * provided that this notice is not removed and that neither Oliver Laumann
 * nor Teles nor Nixdorf are deemed to have made any representations as to
 * the suitability of this software for any purpose nor are held responsible
 * for any defects of this software.
 *
 * THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
 */

#include "unix.h"

#include <string.h>
#ifdef HAVE_PWD_H
#   include <pwd.h>
#endif
#ifdef HAVE_GRP_H
#   include <grp.h>
#endif

static Object P_Get_Passwd(int argc, Object *argv) {
#ifndef WIN32
    struct passwd *p;
    Object arg, x;

    Check_Result_Vector(argv[0], 7);
    Disable_Interrupts;
    if (argc == 1) {
        if ((p = getpwent()) == 0) {
            Enable_Interrupts;
            Raise_Error("no more passwd entries");
        }
    } else {
        arg = argv[1];
        switch (TYPE(arg)) {
        case T_Fixnum: case T_Bignum:
            p = getpwuid(Get_Integer(arg));
            break;
        case T_String: case T_Symbol:
            p = getpwnam(Get_String(arg));
            break;
        default:
            Wrong_Type_Combination(arg, "integer, string, or symbol");
        }
        if (p == 0) {
            Enable_Interrupts;
            Raise_Error1("no passwd entry for ~s", arg);
        }
    }
    Enable_Interrupts;
    x = Make_String(p->pw_name, strlen(p->pw_name));
    VECTOR(argv[0])->data[0] = x;
    x = Make_String(p->pw_passwd, strlen(p->pw_passwd));
    VECTOR(argv[0])->data[1] = x;
    x = Make_Integer(p->pw_uid);
    VECTOR(argv[0])->data[2] = x;
    x = Make_Integer(p->pw_gid);
    VECTOR(argv[0])->data[3] = x;
    x = Make_String(p->pw_gecos, strlen(p->pw_gecos));
    VECTOR(argv[0])->data[4] = x;
    x = Make_String(p->pw_dir, strlen(p->pw_dir));
    VECTOR(argv[0])->data[5] = x;
    x = Make_String(p->pw_shell, strlen(p->pw_shell));
    VECTOR(argv[0])->data[6] = x;
#endif
    return Void;
}

static Object P_Rewind_Passwd() {
#ifndef WIN32
    Disable_Interrupts;
    setpwent();
    Enable_Interrupts;
#endif
    return Void;
}

static Object P_End_Passwd() {
#ifndef WIN32
    Disable_Interrupts;
    endpwent();
    Enable_Interrupts;
#endif
    return Void;
}

static Object P_Get_Group(int argc, Object *argv) {
#ifndef WIN32
    char **pp;
    struct group *p;
    Object arg, member, x;
    GC_Node;

    Check_Result_Vector(argv[0], 4);
    Disable_Interrupts;
    if (argc == 1) {
        if ((p = getgrent()) == 0) {
            Enable_Interrupts;
            Raise_Error("no more group entries");
        }
    } else {
        arg = argv[1];
        switch (TYPE(arg)) {
        case T_Fixnum: case T_Bignum:
            p = getgrgid(Get_Integer(arg));
            break;
        case T_String: case T_Symbol:
            p = getgrnam(Get_String(arg));
            break;
        default:
            Wrong_Type_Combination(arg, "integer, string, or symbol");
        }
        if (p == 0) {
            Enable_Interrupts;
            Raise_Error1("no group entry for ~s", arg);
        }
    }
    Enable_Interrupts;
    x = Make_String(p->gr_name, strlen(p->gr_name));
    VECTOR(argv[0])->data[0] = x;
    x = Make_String(p->gr_passwd, strlen(p->gr_passwd));
    VECTOR(argv[0])->data[1] = x;
    x = Make_Integer(p->gr_gid);
    VECTOR(argv[0])->data[2] = x;
    x = Null;
    GC_Link(x);
    for (pp = p->gr_mem; *pp; pp++) {
        member = Intern(*pp);
        x = Cons(member, x);
    }
    x = P_Reverse(x);
    GC_Unlink;
    VECTOR(argv[0])->data[3] = x;
#endif
    return Void;
}

static Object P_Rewind_Group() {
#ifndef WIN32
    Disable_Interrupts;
    setgrent();
    Enable_Interrupts;
#endif
    return Void;
}

static Object P_End_Group() {
#ifndef WIN32
    Disable_Interrupts;
    endgrent();
    Enable_Interrupts;
#endif
    return Void;
}

void elk_init_unix_passwd() {
    Def_Prim(P_Get_Passwd,    "unix-get-passwd-vector-fill!",   1, 2, VARARGS);
    Def_Prim(P_Rewind_Passwd, "unix-rewind-passwd",             0, 0, EVAL);
    Def_Prim(P_End_Passwd,    "unix-end-passwd",                0, 0, EVAL);
    Def_Prim(P_Get_Group,     "unix-get-group-vector-fill!",    1, 2, VARARGS);
    Def_Prim(P_Rewind_Group,  "unix-rewind-group",              0, 0, EVAL);
    Def_Prim(P_End_Group,     "unix-end-group",                 0, 0, EVAL);
}