mdw@git.distorted.org.uk Git - ezmlm/blob - author.c

   1 /*$Id: author.c,v 1.3 1999/09/29 03:11:44 lindberg Exp $*/
   2 /*$Name:*/
   3
   4 unsigned int author_name(char **sout,char *s,unsigned int l)
   5 /* s is a string that contains a from: line argument\n. We parse */
   6 /* s as follows: If there is an unquoted '<' we eliminate everything after */
   7 /* it else if there is a unquoted ';' we eliminate everything after it.    */
   8 /* Then, we eliminate LWSP and '"' from the beginning and end. Note that   */
   9 /* this is not strict rfc822, but all we need is a display handle that     */
  10 /* doesn't show the address. If in the remaining text there is a '@' we put*/
  11 /* in a '.' instead. Also, there are some non-rfc822 from lines out there  */
  12 /* and we still want to maximize the chance of getting a handle, even if it*/
  13 /* costs a little extra work.*/
  14 {
  15   int squote = 0;
  16   int dquote = 0;
  17   int level = 0;
  18   int flagdone;
  19   unsigned int len;
  20   char ch;
  21   char *cpfirst,*cp;
  22   char *cpcomlast = 0;
  23   char *cpquotlast = 0;
  24   char *cpquot = 0;
  25   char *cpcom = 0;
  26   char *cplt = 0;
  27
  28   if (!s || !l) {       /* Yuck - pass the buck */
  29     *sout = s;
  30     return 0;
  31   }
  32   cp = s; len = l;
  33
  34   while (len--) {
  35     ch = *(cp++);
  36     if (squote) {
  37       squote = 0;
  38       continue;
  39     }
  40     if (ch == '\\') {
  41       squote = 1;
  42       continue;
  43     }
  44     if (ch == '"') {            /* "name" <address@host> */
  45       if (dquote) {
  46         cpquotlast = cp - 2;
  47         break;
  48       } else {
  49         cpquot = cp;
  50         dquote = 1;
  51       }
  52       continue;
  53     } else if (dquote) continue;
  54     if (ch == '(') {
  55         if (!level) cpcom = cp;
  56         level++;
  57     } else if (ch == ')') {
  58         level--;
  59         if (!level)
  60           cpcomlast = cp - 2;   /* address@host (name) */
  61     } else if (!level) {
  62       if (ch == '<') {          /* name <address@host> */
  63         cplt = cp - 2;
  64         break;
  65       } else if (ch == ';') break;      /* address@host ;garbage */
  66     }
  67   }
  68   if (cplt) {                   /* non-comment '<' */
  69     cp = cplt;
  70     cpfirst = s;
  71   } else if (cpquot && cpquotlast >= cpquot) {
  72     cpfirst = cpquot;
  73     cp = cpquotlast;
  74   } else if (cpcom && cpcomlast >= cpcom) {
  75     cpfirst = cpcom;
  76     cp = cpcomlast;
  77   } else {
  78     cp = s + l - 1;
  79     cpfirst = s;
  80   }
  81   flagdone = 0;
  82   for (;;) {            /* e.g. LWSP <user@host> */
  83     while (cpfirst <= cp &&
  84         (*cpfirst == ' ' || *cpfirst == '\t' || *cpfirst == '<')) cpfirst++;
  85     while (cp >= cpfirst &&
  86         (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '>')) cp--;
  87     if (cp >= cpfirst || flagdone)
  88       break;
  89     cp = s + l - 1;
  90     cpfirst = s;
  91     flagdone = 1;
  92   }
  93
  94   *sout = cpfirst;
  95   len = cp - cpfirst + 1;
  96   while (cpfirst <= cp) {
  97     if (*cpfirst == '@')
  98       *cpfirst = '.';
  99     cpfirst++;
 100   }
 101   return len;
 102 }
 103