utils/wvregex.cc

   1 /*
   2  * Worldvisions Weaver Software:
   3  *   Copyright (C) 1997-2004 Net Integration Technologies, Inc.
   4  *
   5  * Implementation of regular expression support though libc
   6  */
   7 #include "wvregex.h"
   8
   9 WvString WvRegex::__wvre_null_reg;
  10
  11 const int WvRegex::default_cflags = WvRegex::EXTENDED;
  12 const int WvRegex::default_eflags = 0;
  13
  14 void WvRegex::seterr(int errcode)
  15 {
  16     int error_desc_len = ::regerror(errcode, &preg, NULL, 0);
  17     if (error_desc_len > 0)
  18     {
  19         WvString error_desc;
  20         error_desc.setsize(error_desc_len);
  21         ::regerror(errcode, &preg, error_desc.edit(), error_desc_len);
  22         WvErrorBase::seterr_both(errcode, error_desc);
  23     }
  24     else WvErrorBase::seterr(errcode);
  25 }
  26
  27 bool WvRegex::set(WvStringParm regex, int cflags)
  28 {
  29     if (have_preg) ::regfree(&preg);
  30
  31     int errcode = ::regcomp(&preg, regex, cflags);
  32     if (errcode)
  33     {
  34         seterr(errcode);
  35         have_preg = false;
  36     }
  37     else have_preg = true;
  38
  39     return have_preg;
  40 }
  41
  42 WvRegex::~WvRegex()
  43 {
  44     if (have_preg) ::regfree(&preg);
  45 }
  46
  47 bool WvRegex::match(WvStringParm string, int eflags,
  48         size_t nmatch, regmatch_t pmatch[]) const
  49 {
  50     if (!have_preg) return false;
  51
  52     return ::regexec(&preg, string, nmatch, pmatch, eflags) == 0;
  53 }