contrib/sendmail-8.14/libsm/config.c

   1 /*
   2  * Copyright (c) 2000-2003, 2007 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  *
   5  * By using this file, you agree to the terms and conditions set
   6  * forth in the LICENSE file which can be found at the top level of
   7  * the sendmail distribution.
   8  *
   9  */
  10
  11 #include <sm/gen.h>
  12 SM_RCSID("@(#)$Id: config.c,v 1.31 2007/03/14 21:21:49 ca Exp $")
  13
  14 #include <stdlib.h>
  15 #include <sm/heap.h>
  16 #include <sm/string.h>
  17 #include <sm/conf.h>
  18
  19 /*
  20 **  PUTENV -- emulation of putenv() in terms of setenv()
  21 **
  22 **      Not needed on Posix-compliant systems.
  23 **      This doesn't have full Posix semantics, but it's good enough
  24 **              for sendmail.
  25 **
  26 **      Parameter:
  27 **              env -- the environment to put.
  28 **
  29 **      Returns:
  30 **              0 on success, < 0 on failure.
  31 */
  32
  33 #if NEEDPUTENV
  34
  35 # if NEEDPUTENV == 2            /* no setenv(3) call available */
  36
  37 int
  38 putenv(str)
  39         char *str;
  40 {
  41         char **current;
  42         int matchlen, envlen = 0;
  43         char *tmp;
  44         char **newenv;
  45         static bool first = true;
  46         extern char **environ;
  47
  48         /*
  49         **  find out how much of str to match when searching
  50         **  for a string to replace.
  51         */
  52
  53         if ((tmp = strchr(str, '=')) == NULL || tmp == str)
  54                 matchlen = strlen(str);
  55         else
  56                 matchlen = (int) (tmp - str);
  57         ++matchlen;
  58
  59         /*
  60         **  Search for an existing string in the environment and find the
  61         **  length of environ.  If found, replace and exit.
  62         */
  63
  64         for (current = environ; *current != NULL; current++)
  65         {
  66                 ++envlen;
  67
  68                 if (strncmp(str, *current, matchlen) == 0)
  69                 {
  70                         /* found it, now insert the new version */
  71                         *current = (char *) str;
  72                         return 0;
  73                 }
  74         }
  75
  76         /*
  77         **  There wasn't already a slot so add space for a new slot.
  78         **  If this is our first time through, use malloc(), else realloc().
  79         */
  80
  81         if (first)
  82         {
  83                 newenv = (char **) sm_malloc(sizeof(char *) * (envlen + 2));
  84                 if (newenv == NULL)
  85                         return -1;
  86
  87                 first = false;
  88                 (void) memcpy(newenv, environ, sizeof(char *) * envlen);
  89         }
  90         else
  91         {
  92                 newenv = (char **) sm_realloc((char *) environ,
  93                                               sizeof(char *) * (envlen + 2));
  94                 if (newenv == NULL)
  95                         return -1;
  96         }
  97
  98         /* actually add in the new entry */
  99         environ = newenv;
 100         environ[envlen] = (char *) str;
 101         environ[envlen + 1] = NULL;
 102
 103         return 0;
 104 }
 105
 106 # else /* NEEDPUTENV == 2 */
 107
 108 int
 109 putenv(env)
 110         char *env;
 111 {
 112         char *p;
 113         int l;
 114         char nbuf[100];
 115
 116         p = strchr(env, '=');
 117         if (p == NULL)
 118                 return 0;
 119         l = p - env;
 120         if (l > sizeof nbuf - 1)
 121                 l = sizeof nbuf - 1;
 122         memmove(nbuf, env, l);
 123         nbuf[l] = '\0';
 124         return setenv(nbuf, ++p, 1);
 125 }
 126
 127 # endif /* NEEDPUTENV == 2 */
 128 #endif /* NEEDPUTENV */
 129 /*
 130 **  UNSETENV -- remove a variable from the environment
 131 **
 132 **      Not needed on newer systems.
 133 **
 134 **      Parameters:
 135 **              name -- the string name of the environment variable to be
 136 **                      deleted from the current environment.
 137 **
 138 **      Returns:
 139 **              none.
 140 **
 141 **      Globals:
 142 **              environ -- a pointer to the current environment.
 143 **
 144 **      Side Effects:
 145 **              Modifies environ.
 146 */
 147
 148 #if !HASUNSETENV
 149
 150 void
 151 unsetenv(name)
 152         char *name;
 153 {
 154         extern char **environ;
 155         register char **pp;
 156         int len = strlen(name);
 157
 158         for (pp = environ; *pp != NULL; pp++)
 159         {
 160                 if (strncmp(name, *pp, len) == 0 &&
 161                     ((*pp)[len] == '=' || (*pp)[len] == '\0'))
 162                         break;
 163         }
 164
 165         for (; *pp != NULL; pp++)
 166                 *pp = pp[1];
 167 }
 168
 169 #endif /* !HASUNSETENV */
 170
 171 char *SmCompileOptions[] =
 172 {
 173 #if SM_CONF_BROKEN_STRTOD
 174         "SM_CONF_BROKEN_STRTOD",
 175 #endif /* SM_CONF_BROKEN_STRTOD */
 176 #if SM_CONF_GETOPT
 177         "SM_CONF_GETOPT",
 178 #endif /* SM_CONF_GETOPT */
 179 #if SM_CONF_LDAP_INITIALIZE
 180         "SM_CONF_LDAP_INITIALIZE",
 181 #endif /* SM_CONF_LDAP_INITIALIZE */
 182 #if SM_CONF_LDAP_MEMFREE
 183         "SM_CONF_LDAP_MEMFREE",
 184 #endif /* SM_CONF_LDAP_MEMFREE */
 185 #if SM_CONF_LONGLONG
 186         "SM_CONF_LONGLONG",
 187 #endif /* SM_CONF_LONGLONG */
 188 #if SM_CONF_MEMCHR
 189         "SM_CONF_MEMCHR",
 190 #endif /* SM_CONF_MEMCHR */
 191 #if SM_CONF_MSG
 192         "SM_CONF_MSG",
 193 #endif /* SM_CONF_MSG */
 194 #if SM_CONF_QUAD_T
 195         "SM_CONF_QUAD_T",
 196 #endif /* SM_CONF_QUAD_T */
 197 #if SM_CONF_SEM
 198         "SM_CONF_SEM",
 199 #endif /* SM_CONF_SEM */
 200 #if SM_CONF_SETITIMER
 201         "SM_CONF_SETITIMER",
 202 #endif /* SM_CONF_SETITIMER */
 203 #if SM_CONF_SIGSETJMP
 204         "SM_CONF_SIGSETJMP",
 205 #endif /* SM_CONF_SIGSETJMP */
 206 #if SM_CONF_SHM
 207         "SM_CONF_SHM",
 208 #endif /* SM_CONF_SHM */
 209 #if SM_CONF_SHM_DELAY
 210         "SM_CONF_SHM_DELAY",
 211 #endif /* SM_CONF_SHM_DELAY */
 212 #if SM_CONF_SSIZE_T
 213         "SM_CONF_SSIZE_T",
 214 #endif /* SM_CONF_SSIZE_T */
 215 #if SM_CONF_STDBOOL_H
 216         "SM_CONF_STDBOOL_H",
 217 #endif /* SM_CONF_STDBOOL_H */
 218 #if SM_CONF_STDDEF_H
 219         "SM_CONF_STDDEF_H",
 220 #endif /* SM_CONF_STDDEF_H */
 221
 222 #if 0
 223 /* XXX this is always enabled (for now) */
 224 #if SM_CONF_STRL
 225         "SM_CONF_STRL",
 226 #endif /* SM_CONF_STRL */
 227 #endif /* 0 */
 228
 229 #if SM_CONF_SYS_CDEFS_H
 230         "SM_CONF_SYS_CDEFS_H",
 231 #endif /* SM_CONF_SYS_CDEFS_H */
 232 #if SM_CONF_SYSEXITS_H
 233         "SM_CONF_SYSEXITS_H",
 234 #endif /* SM_CONF_SYSEXITS_H */
 235 #if SM_CONF_UID_GID
 236         "SM_CONF_UID_GID",
 237 #endif /* SM_CONF_UID_GID */
 238 #if DO_NOT_USE_STRCPY
 239         "DO_NOT_USE_STRCPY",
 240 #endif /* DO_NOT_USE_STRCPY */
 241 #if SM_HEAP_CHECK
 242         "SM_HEAP_CHECK",
 243 #endif /* SM_HEAP_CHECK */
 244 #if defined(SM_OS_NAME) && defined(__STDC__)
 245         "SM_OS=sm_os_" SM_OS_NAME,
 246 #endif /* defined(SM_OS_NAME) && defined(__STDC__) */
 247 #if SM_VA_STD
 248         "SM_VA_STD",
 249 #endif /* SM_VA_STD */
 250 #if USEKSTAT
 251         "USEKSTAT",
 252 #endif /* USEKSTAT */
 253 #if USEPROCMEMINFO
 254         "USEPROCMEMINFO",
 255 #endif /* USEPROCMEMINFO */
 256 #if USESWAPCTL
 257         "USESWAPCTL",
 258 #endif /* USESWAPCTL */
 259         NULL
 260 };