mdw@git.distorted.org.uk Git - qmail/blob - quote.c

   1 #include "stralloc.h"
   2 #include "str.h"
   3 #include "quote.h"
   4
   5 /*
   6 quote() encodes a box as per rfc 821 and rfc 822,
   7 while trying to do as little quoting as possible.
   8 no, 821 and 822 don't have the same encoding. they're not even close.
   9 no special encoding here for bytes above 127.
  10 */
  11
  12 static char ok[128] = {
  13  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
  14 ,0,7,0,7,7,7,7,7,0,0,7,7,0,7,7,7 ,7,7,7,7,7,7,7,7,7,7,0,0,0,7,0,7
  15 ,0,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 ,7,7,7,7,7,7,7,7,7,7,7,0,0,0,7,7
  16 ,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 ,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,0
  17 } ;
  18
  19 static int doit(saout,sain)
  20 stralloc *saout;
  21 stralloc *sain;
  22 {
  23  char ch;
  24  int i;
  25  int j;
  26
  27  if (!stralloc_ready(saout,sain->len * 2 + 2)) return 0;
  28  j = 0;
  29  saout->s[j++] = '"';
  30  for (i = 0;i < sain->len;++i)
  31   {
  32    ch = sain->s[i];
  33    if ((ch == '\r') || (ch == '\n') || (ch == '"') || (ch == '\\'))
  34      saout->s[j++] = '\\';
  35    saout->s[j++] = ch;
  36   }
  37  saout->s[j++] = '"';
  38  saout->len = j;
  39  return 1;
  40 }
  41
  42 int quote_need(s,n)
  43 char *s;
  44 unsigned int n;
  45 {
  46  unsigned char uch;
  47  int i;
  48  if (!n) return 1;
  49  for (i = 0;i < n;++i)
  50   {
  51    uch = s[i];
  52    if (uch >= 128) return 1;
  53    if (!ok[uch]) return 1;
  54   }
  55  if (s[0] == '.') return 1;
  56  if (s[n - 1] == '.') return 1;
  57  for (i = 0;i < n - 1;++i) if (s[i] == '.') if (s[i + 1] == '.') return 1;
  58  return 0;
  59 }
  60
  61 int quote(saout,sain)
  62 stralloc *saout;
  63 stralloc *sain;
  64 {
  65  if (quote_need(sain->s,sain->len)) return doit(saout,sain);
  66  return stralloc_copy(saout,sain);
  67 }
  68
  69 static stralloc foo = {0};
  70
  71 int quote2(sa,s)
  72 stralloc *sa;
  73 char *s;
  74 {
  75  int j;
  76  if (!*s) return stralloc_copys(sa,s);
  77  j = str_rchr(s,'@');
  78  if (!stralloc_copys(&foo,s)) return 0;
  79  if (!s[j]) return quote(sa,&foo);
  80  foo.len = j;
  81  if (!quote(sa,&foo)) return 0;
  82  return stralloc_cats(sa,s + j);
  83 }