diplodocus.org Git - nmh/blob - sbr/unquote.c

   1 /* unquote.c -- Handle quote removal and quoted-pair strings on
   2  * RFC 2822-5322 atoms.
   3  *
   4  * This code is Copyright (c) 2013, by the authors of nmh.  See the
   5  * COPYRIGHT file in the root directory of the nmh distribution for
   6  * complete copyright information.
   7  */
   8
   9 #include <h/mh.h>
  10 #include "unquote.h"
  11
  12 /*
  13  * Remove quotes (and handle escape strings) from RFC 5322 quoted-strings.
  14  *
  15  * Since we never add characters to the string, the output buffer is assumed
  16  * to have at least as many characters as the input string.
  17  *
  18  */
  19
  20 void
  21 unquote_string(const char *input, char *output)
  22 {
  23     int n = 0;  /* n is the position in the input buffer */
  24     int m = 0;  /* m is the position in the output buffer */
  25
  26     while ( input[n] != '\0') {
  27         switch ( input[n] ) {
  28         case '\\':
  29             n++;
  30             if ( input[n] != '\0')
  31                 output[m++] = input[n++];
  32             break;
  33         case '"':
  34             n++;
  35             break;
  36         default:
  37             output[m++] = input[n++];
  38             break;
  39         }
  40     }
  41
  42     output[m] = '\0';
  43 }