external/ibm-public/postfix/dist/src/global/fold_addr.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      fold_addr 3
   6 /* SUMMARY
   7 /*      address case folding
   8 /* SYNOPSIS
   9 /*      #include <fold_addr.h>
  10 /*
  11 /*      char    *fold_addr(addr, flags)
  12 /*      char    *addr;
  13 /*      int     flags;
  14 /* DESCRIPTION
  15 /*      fold_addr() case folds an address according to the options
  16 /*      specified with \fIflags\fR. The result value is the address
  17 /*      argument.
  18 /*
  19 /*      Arguments
  20 /* .IP addr
  21 /*      Null-terminated writable string with the address.
  22 /* .IP flags
  23 /*      Zero or the bit-wise OR of:
  24 /* .RS
  25 /* .IP FOLD_ADDR_USER
  26 /*      Case fold the address local part.
  27 /* .IP FOLD_ADDR_HOST
  28 /*      Case fold the address domain part.
  29 /* .IP FOLD_ADDR_ALL
  30 /*      Alias for (FOLD_ADDR_USER | FOLD_ADDR_HOST).
  31 /* .RE
  32 /* SEE ALSO
  33 /*      msg(3) diagnostics interface
  34 /* DIAGNOSTICS
  35 /*      Fatal errors: memory allocation problem.
  36 /* LICENSE
  37 /* .ad
  38 /* .fi
  39 /*      The Secure Mailer license must be distributed with this software.
  40 /* AUTHOR(S)
  41 /*      Wietse Venema
  42 /*      IBM T.J. Watson Research
  43 /*      P.O. Box 704
  44 /*      Yorktown Heights, NY 10598, USA
  45 /*--*/
  46
  47 /* System library. */
  48
  49 #include <sys_defs.h>
  50 #include <string.h>
  51
  52 /* Utility library. */
  53
  54 #include <stringops.h>
  55
  56 /* Global library. */
  57
  58 #include <fold_addr.h>
  59
  60 /* fold_addr - case fold mail address */
  61
  62 char   *fold_addr(char *addr, int flags)
  63 {
  64     char   *cp;
  65
  66     /*
  67      * Fold the address as appropriate.
  68      */
  69     switch (flags & FOLD_ADDR_ALL) {
  70     case FOLD_ADDR_HOST:
  71         if ((cp = strrchr(addr, '@')) != 0)
  72             lowercase(cp + 1);
  73         break;
  74     case FOLD_ADDR_USER:
  75         if ((cp = strrchr(addr, '@')) != 0) {
  76             *cp = 0;
  77             lowercase(addr);
  78             *cp = '@';
  79             break;
  80         }
  81         /* FALLTHROUGH */
  82     case FOLD_ADDR_USER | FOLD_ADDR_HOST:
  83         lowercase(addr);
  84         break;
  85     }
  86     return (addr);
  87 }