mdw@git.distorted.org.uk Git - tripe/blob - common/util.h

   1 /* -*-c-*-
   2  *
   3  * Utilities for the client and the server
   4  *
   5  * (c) 2001 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Trivial IP Encryption (TrIPE).
  11  *
  12  * TrIPE is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * TrIPE is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with TrIPE; if not, write to the Free Software Foundation,
  24  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 #ifndef UTIL_H
  28 #define UTIL_H
  29
  30 #ifndef CONFIG_H
  31 #  include "config.h"
  32 #endif
  33
  34 #include <sys/types.h>
  35
  36 #ifdef __cplusplus
  37   extern "C" {
  38 #endif
  39
  40 /*----- Macros ------------------------------------------------------------*/
  41
  42 /* --- @IGNORE@ --- *
  43  *
  44  * Arguments:   @expr@ = an expression whose value is to be ignored
  45  *
  46  * Use:         Ignores the value of an expression, even if compilers want
  47  *              us not to.
  48  */
  49
  50 #define IGNORE(expr) do { if (expr) ; } while (0)
  51
  52 /*----- Functions provided ------------------------------------------------*/
  53
  54 /* --- @u_quotify@ --- *
  55  *
  56  * Arguments:   @dstr *d@ = where to write the answer
  57  *              @const char *p@ = string to quotify
  58  *
  59  * Returns:     ---
  60  *
  61  * Use:         Quotes the given string if necessary, according to our
  62  *              quoting rules.
  63  */
  64
  65 extern void u_quotify(dstr */*d*/, const char */*p*/);
  66
  67 /* --- @u_getuser@ --- *
  68  *
  69  * Arguments:   @const char *name@ = user name or id requested
  70  *              @gid_t *gg@ = where to store corresponding gid
  71  *
  72  * Returns:     Corresponding uid.
  73  *
  74  * Use:         Resolves a user name into a uid.  Dies on failure; suitable
  75  *              for use in argument parsing.
  76  */
  77
  78 extern uid_t u_getuser(const char */*name*/, gid_t */*gg*/);
  79
  80 /* --- @u_getgroup@ --- *
  81  *
  82  * Arguments:   @const char *name@ = user name or id requested
  83  *
  84  * Returns:     Corresponding gid.
  85  *
  86  * Use:         Resolves a group name into a gid.  Dies on failure; suitable
  87  *              for use in argument parsing.
  88  */
  89
  90 extern gid_t u_getgroup(const char */*name*/);
  91
  92 /* --- @u_setugid@ --- *
  93  *
  94  * Arguments:   @uid_t u@ = user to set
  95  *              @gid_t g@ = group to set
  96  *
  97  * Returns:     ---
  98  *
  99  * Use:         Sets user and group to the given values; aborts on failure.
 100  */
 101
 102 extern void u_setugid(uid_t /*u*/, gid_t /*g*/);
 103
 104 /*----- That's all, folks -------------------------------------------------*/
 105
 106 #ifdef __cplusplus
 107   }
 108 #endif
 109
 110 #endif