external/ibm-public/postfix/dist/src/util/dict_env.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      dict_env 3
   6 /* SUMMARY
   7 /*      dictionary manager interface to environment variables
   8 /* SYNOPSIS
   9 /*      #include <dict_env.h>
  10 /*
  11 /*      DICT    *dict_env_open(name, dummy, dict_flags)
  12 /*      const char *name;
  13 /*      int     dummy;
  14 /*      int     dict_flags;
  15 /* DESCRIPTION
  16 /*      dict_env_open() opens the environment variable array and
  17 /*      makes it accessible via the generic operations documented
  18 /*      in dict_open(3). The \fIname\fR and \fIdummy\fR arguments
  19 /*      are ignored.
  20 /* SEE ALSO
  21 /*      dict(3) generic dictionary manager
  22 /*      safe_getenv(3) safe getenv() interface
  23 /* LICENSE
  24 /* .ad
  25 /* .fi
  26 /*      The Secure Mailer license must be distributed with this software.
  27 /* AUTHOR(S)
  28 /*      Wietse Venema
  29 /*      IBM T.J. Watson Research
  30 /*      P.O. Box 704
  31 /*      Yorktown Heights, NY 10598, USA
  32 /*--*/
  33
  34 /* System library. */
  35
  36 #include "sys_defs.h"
  37 #include <stdio.h>                      /* sprintf() prototype */
  38 #include <stdlib.h>
  39 #include <unistd.h>
  40 #include <string.h>
  41
  42 /* Utility library. */
  43
  44 #include "mymalloc.h"
  45 #include "msg.h"
  46 #include "safe.h"
  47 #include "stringops.h"
  48 #include "dict.h"
  49 #include "dict_env.h"
  50
  51 /* dict_env_update - update environment array */
  52
  53 static void dict_env_update(DICT *dict, const char *name, const char *value)
  54 {
  55
  56     /*
  57      * Optionally fold the key.
  58      */
  59     if (dict->flags & DICT_FLAG_FOLD_FIX) {
  60         if (dict->fold_buf == 0)
  61             dict->fold_buf = vstring_alloc(10);
  62         vstring_strcpy(dict->fold_buf, name);
  63         name = lowercase(vstring_str(dict->fold_buf));
  64     }
  65     if (setenv(name, value, 1))
  66         msg_fatal("setenv: %m");
  67 }
  68
  69 /* dict_env_lookup - access environment array */
  70
  71 static const char *dict_env_lookup(DICT *dict, const char *name)
  72 {
  73     dict_errno = 0;
  74
  75     /*
  76      * Optionally fold the key.
  77      */
  78     if (dict->flags & DICT_FLAG_FOLD_FIX) {
  79         if (dict->fold_buf == 0)
  80             dict->fold_buf = vstring_alloc(10);
  81         vstring_strcpy(dict->fold_buf, name);
  82         name = lowercase(vstring_str(dict->fold_buf));
  83     }
  84     return (safe_getenv(name));
  85 }
  86
  87 /* dict_env_close - close environment dictionary */
  88
  89 static void dict_env_close(DICT *dict)
  90 {
  91     if (dict->fold_buf)
  92         vstring_free(dict->fold_buf);
  93     dict_free(dict);
  94 }
  95
  96 /* dict_env_open - make association with environment array */
  97
  98 DICT   *dict_env_open(const char *name, int unused_flags, int dict_flags)
  99 {
 100     DICT   *dict;
 101
 102     dict = dict_alloc(DICT_TYPE_ENVIRON, name, sizeof(*dict));
 103     dict->lookup = dict_env_lookup;
 104     dict->update = dict_env_update;
 105     dict->close = dict_env_close;
 106     dict->flags = dict_flags | DICT_FLAG_FIXED;
 107     if (dict_flags & DICT_FLAG_FOLD_FIX)
 108         dict->fold_buf = vstring_alloc(10);
 109     return (DICT_DEBUG (dict));
 110 }