Email parser in C (not c++ plz)

[datasunny]

HI all,

Is there any good MIME email message parser wrote in C?
Thanks a lot.

[elitecore]

u can try gmime, msgsdk ...........

[slakr]

HI all,

Is there any good email parser wrote in C?
Thanks a lot.

I wrote the below about a year and it works great. Give it a whirl.

#ifndef TRUE
# define TRUE 1
#endif

#ifndef FALSE
# define FALSE 0
#endif

typedef int bool;

/*
 * Please refer to http://en.wikipedia.org/wiki/Email_address for a
 * description of acceptable characters in an email.  The information
 * there is extracted from rfc2821 and is much easier to understand.
 *
 * Please refer to rfc2821: section 4.5.3.1 "Size limits and minimums" for
 * the defined local-part and domain size limits.
 *
 * This does not support quoted local-parts: "foo"@bar.com will be FALSE.
 */
bool strisemail(const char *email)
{
  int domain_count = 0;
  bool have_atsign = FALSE;
  const char *e = email;

  if(!e || !*e || *e=='.')
    return FALSE;

  /* LOCAL-PART limited to 64 characters */
  for(; *e; ++e)
  {
    if(e-email >= 64)
      return FALSE;

    switch(*e)
    {
      case '@':
        if(*(e-1) == '.')
          return FALSE;
        ++e;
        have_atsign = TRUE;
        goto LOCAL_PART_END;

      /* local-part acceptable characters */
      case '.':
      case '-':
      case '_':
      case '!':
      case '#':
      case '$':
      case '%':
      case '&':
      case '\'':
      case '*':
      case '+':
      case '/':
      case '=':
      case '?':
      case '^':
      case '`':
      case '{':
      case '|':
      case '}':
      case '~':
        break;

      default:
        if(!isalnum(*e))
          return FALSE;
     }
  }
  LOCAL_PART_END:

  if(e-email < 2 || !have_atsign || *e=='.') /* no @. */
    return FALSE;

  /* DOMAIN: A max of 4 sub-domains limited to 255. */
  for(; *e; ++e)
  {
    if(e-email >= 255)
      return FALSE;

    switch(*e)
    {
      /* found subdomain */
      case '.':
        if(++domain_count > 4)
          return FALSE;
        /* fall-thru */
      case '-':
      case '_':
        break;

      default:
        if(!isalnum(*e))
          return FALSE;
    }
  }

  /* I think [.-_] can be in the extension, just not last char?
     I also make sure there is at least a 2 char extension. */
  return domain_count &&
         e-email >= 6 &&
         e-email < (255 + 64) &&
         *(e-1) != '.' &&
         *(e-2) != '.';
}