BSD 4_3_Net_2 development

Work on file usr/src/lib/libg++/libg++/Regex.cc

Synthesized-from: CSRG/cd2/net.2

diff --git a/usr/src/lib/libg++/libg++/Regex.cc b/usr/src/lib/libg++/libg++/Regex.cc
new file mode 100644 (file)
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+++ b/usr/src/lib/libg++/libg++/Regex.cc
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+/* 
+Copyright (C) 1988 Free Software Foundation
+    written by Doug Lea (dl@rocky.oswego.edu)
+
+This file is part of GNU CC.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY.  No author or distributor
+accepts responsibility to anyone for the consequences of using it
+or for whether it serves any particular purpose or works at all,
+unless he says so in writing.  Refer to the GNU CC General Public
+License for full details.
+
+Everyone is granted permission to copy, modify and redistribute
+GNU CC, but only under the conditions described in the
+GNU CC General Public License.   A copy of this license is
+supposed to have been given to you along with GNU CC so you
+can know your rights and responsibilities.  It should be in a
+file named COPYING.  Among other things, the copyright notice
+and this notice must be preserved on all copies.  
+*/
+
+/* 
+  Regex class implementation
+ */
+
+#ifdef __GNUG__
+#pragma implementation
+#endif
+#include <std.h>
+#include <ctype.h>
+#include <values.h>
+#include <new.h>
+#include <builtin.h>
+
+// extern "C" {
+#include <regex.h>
+// }
+
+#include <Regex.h>
+
+Regex::~Regex()
+{
+  delete(buf->buffer);
+  delete(buf->fastmap);
+  delete(buf);
+  delete(reg);
+}
+
+Regex::Regex(const char* t, int fast, int bufsize, 
+               const char* transtable)
+{
+  int tlen = (t == 0)? 0 : strlen(t);
+  buf = new re_pattern_buffer;
+  reg = new re_registers;
+  if (fast)
+    buf->fastmap = new char[256];
+  else
+    buf->fastmap = 0;
+  buf->translate = (char*)transtable;
+  if (tlen > bufsize)
+    bufsize = tlen;
+  buf->allocated = bufsize;
+  buf->buffer = new char [buf->allocated];
+  char* msg = re_compile_pattern((char*)t, tlen, buf);
+  if (msg != 0)
+    (*lib_error_handler)("Regex", msg);
+  else if (fast)
+    re_compile_fastmap(buf);
+}
+
+int Regex::match_info(int& start, int& length, int nth) const
+{
+  if ((unsigned)(nth) >= RE_NREGS)
+    return 0;
+  else
+  {
+    start = reg->start[nth];
+    length = reg->end[nth] - start;
+    return start >= 0 && length >= 0;
+  }
+}
+
+int Regex::search(const char* s, int len, int& matchlen, int startpos) const
+{
+  int matchpos, pos, range;
+  if (startpos >= 0)
+  {
+    pos = startpos;
+    range = len - startpos;
+  }
+  else
+  {
+    pos = len + startpos;
+    range = -pos;
+  }
+  matchpos = re_search_2(buf, 0, 0, (char*)s, len, pos, range, reg, len);
+  if (matchpos >= 0)
+    matchlen = reg->end[0] - reg->start[0];
+  else
+    matchlen = 0;
+  return matchpos;
+}
+
+int Regex::match(const char*s, int len, int p) const
+{
+  if (p < 0)
+  {
+    p += len;
+    if (p > len)
+      return -1;
+    return re_match_2(buf, 0, 0, (unsigned char*)s, p, 0, reg, p);
+  }
+  else if (p > len)
+    return -1;
+  else
+    return re_match_2(buf, 0, 0, (unsigned char*)s, len, p, reg, len);
+}
+
+int Regex::OK() const
+{
+// can't verify much, since we've lost the original string
+  int v = buf != 0;             // have a regex buf
+  v &= buf->buffer != 0;        // with a pat
+  if (!v) (*lib_error_handler)("Regex", "invariant failure");
+  return v;
+}
+
+/*
+ some built-in Regular expressions
+*/
+
+const Regex RXwhite("[ \n\t\r\v\f]+", 1);
+const Regex RXint("-?[0-9]+", 1);
+const Regex RXdouble("-?\\(\\([0-9]+\\.[0-9]*\\)\\|\\([0-9]+\\)\\|\\(\\.[0-9]+\\)\\)\\([eE][---+]?[0-9]+\\)?", 1, 200);
+const Regex RXalpha("[A-Za-z]+", 1);
+const Regex RXlowercase("[a-z]+", 1);
+const Regex RXuppercase("[A-Z]+", 1);
+const Regex RXalphanum("[0-9A-Za-z]+", 1);
+const Regex RXidentifier("[A-Za-z_][A-Za-z0-9_]*", 1);
+