Intermediate changes

commit_hash:d5b1af16dbe9030537a04c27eb410c88c2f496cd

1 files changed, 2198 insertions, 0 deletions

diff --git a/contrib/tools/swig/Source/Preprocessor/cpp.c b/contrib/tools/swig/Source/Preprocessor/cpp.c
new file mode 100644
index 00000000000..407ccd51546
--- /dev/null
+++ b/contrib/tools/swig/Source/Preprocessor/cpp.c
@@ -0,0 +1,2198 @@
+/* -----------------------------------------------------------------------------
+ * This file is part of SWIG, which is licensed as a whole under version 3 
+ * (or any later version) of the GNU General Public License. Some additional
+ * terms also apply to certain portions of SWIG. The full details of the SWIG
+ * license and copyrights can be found in the LICENSE and COPYRIGHT files
+ * included with the SWIG source code as distributed by the SWIG developers
+ * and at https://www.swig.org/legal.html.
+ *
+ * cpp.c
+ *
+ * An implementation of a C preprocessor plus some support for additional
+ * SWIG directives.
+ *
+ * - SWIG directives such as %include and %import are handled
+ * - A new macro %define ... %enddef can be used for multiline macros
+ * - No preprocessing is performed in %{ ... %} blocks
+ * - Lines beginning with %# are stripped down to #... and passed through.
+ * ----------------------------------------------------------------------------- */
+
+#include "swig.h"
+#include "preprocessor.h"
+#include <ctype.h>
+
+static Hash *cpp = 0;		/* C preprocessor data */
+static int include_all = 0;	/* Follow all includes */
+static int ignore_missing = 0;
+static int import_all = 0;	/* Follow all includes, but as %import statements */
+static int imported_depth = 0;	/* Depth of %imported files */
+static int single_include = 1;	/* Only include each file once */
+static Hash *included_files = 0;
+static List *dependencies = 0;
+static Scanner *id_scan = 0;
+static int error_as_warning = 0;	/* Understand the cpp #error directive as a special #warning */
+static int expand_defined_operator = 0;
+static int macro_level = 0;
+static int macro_start_line = 0;
+static const String * macro_start_file = 0;
+
+/* Test a character to see if it starts an identifier */
+#define isidentifier(c) ((isalpha(c)) || (c == '_') || (c == '$'))
+
+/* Test a character to see if it valid in an identifier (after the first letter) */
+#define isidchar(c) ((isalnum(c)) || (c == '_') || (c == '$'))
+
+static DOH *Preprocessor_replace(DOH *, DOH *);
+
+/* Skip whitespace */
+static void skip_whitespace(String *s, String *out) {
+  int c;
+  while ((c = Getc(s)) != EOF) {
+    if (!isspace(c)) {
+      Ungetc(c, s);
+      break;
+    } else if (out)
+      Putc(c, out);
+  }
+}
+
+/* Skip to a specified character taking line breaks into account */
+static int skip_tochar(String *s, int ch, String *out) {
+  int c;
+  while ((c = Getc(s)) != EOF) {
+    if (out)
+      Putc(c, out);
+    if (c == ch)
+      break;
+    if (c == '\\') {
+      c = Getc(s);
+      if ((c != EOF) && (out))
+	Putc(c, out);
+    }
+  }
+  if (c == EOF)
+    return -1;
+  return 0;
+}
+
+/* Skip to a specified character or the end of the line */
+static int skip_tochar_or_eol(String *s, int ch, String *out) {
+  int c;
+  while ((c = Getc(s)) != EOF) {
+    if (c == '\n') {
+	Ungetc(c, s);
+	break;
+    }
+    if (out)
+      Putc(c, out);
+    if (c == ch)
+      break;
+    if (c == '\\') {
+      c = Getc(s);
+      if ((c != EOF) && (out))
+	Putc(c, out);
+    }
+  }
+  if (c == EOF)
+    return -1;
+  return 0;
+}
+
+static void copy_location(const DOH *s1, DOH *s2) {
+  Setfile(s2, Getfile((DOH *) s1));
+  Setline(s2, Getline((DOH *) s1));
+}
+
+static String *cpp_include(const_String_or_char_ptr fn, int sysfile) {
+  String *s = sysfile ? Swig_include_sys(fn) : Swig_include(fn);
+  if (s && single_include) {
+    String *file = Getfile(s);
+    if (Getattr(included_files, file)) {
+      Delete(s);
+      return 0;
+    }
+    Setattr(included_files, file, file);
+  }
+  if (!s) {
+    if (ignore_missing) {
+      Swig_warning(WARN_PP_MISSING_FILE, Getfile(fn), Getline(fn), "Unable to find '%s'\n", fn);
+    } else {
+      Swig_error(Getfile(fn), Getline(fn), "Unable to find '%s'\n", fn);
+    }
+  } else {
+    String *lf;
+    Seek(s, 0, SEEK_SET);
+    if (!dependencies) {
+      dependencies = NewList();
+    }
+    lf = Copy(Swig_last_file());
+    Append(dependencies, lf);
+    Delete(lf);
+  }
+  return s;
+}
+
+static int is_digits(const String *str) {
+  const char *s = Char(str);
+  int isdigits = (*s != 0);
+  while (*s) {
+    if (!isdigit((int)*s)) {
+      isdigits = 0;
+      break;
+    }
+    s++;
+  }
+  return isdigits;
+}
+
+List *Preprocessor_depend(void) {
+  return dependencies;
+}
+
+/* -----------------------------------------------------------------------------
+ * void Preprocessor_cpp_init() - Initialize the preprocessor
+ * ----------------------------------------------------------------------------- */
+static String *kpp_args = 0;
+static String *kpp_define = 0;
+static String *kpp_defined = 0;
+static String *kpp_elif = 0;
+static String *kpp_else = 0;
+static String *kpp_endif = 0;
+static String *kpp_expanded = 0;
+static String *kpp_if = 0;
+static String *kpp_ifdef = 0;
+static String *kpp_ifndef = 0;
+static String *kpp_name = 0;
+static String *kpp_swigmacro = 0;
+static String *kpp_symbols = 0;
+static String *kpp_undef = 0;
+static String *kpp_value = 0;
+static String *kpp_varargs = 0;
+static String *kpp_error = 0;
+static String *kpp_warning = 0;
+static String *kpp_line = 0;
+static String *kpp_include = 0;
+static String *kpp_pragma = 0;
+static String *kpp_level = 0;
+
+static String *kpp_dline = 0;
+static String *kpp_ddefine = 0;
+static String *kpp_dinclude = 0;
+static String *kpp_dimport = 0;
+static String *kpp_dbeginfile = 0;
+
+static String *kpp_LINE = 0;
+static String *kpp_FILE = 0;
+
+static String *kpp_hash_if = 0;
+static String *kpp_hash_elif = 0;
+
+void Preprocessor_init(void) {
+  Hash *s;
+
+  kpp_args = NewString("args");
+  kpp_define = NewString("define");
+  kpp_defined = NewString("defined");
+  kpp_else = NewString("else");
+  kpp_elif = NewString("elif");
+  kpp_endif = NewString("endif");
+  kpp_expanded = NewString("*expanded*");
+  kpp_if = NewString("if");
+  kpp_ifdef = NewString("ifdef");
+  kpp_ifndef = NewString("ifndef");
+  kpp_name = NewString("name");
+  kpp_swigmacro = NewString("swigmacro");
+  kpp_symbols = NewString("symbols");
+  kpp_undef = NewString("undef");
+  kpp_value = NewString("value");
+  kpp_error = NewString("error");
+  kpp_warning = NewString("warning");
+  kpp_pragma = NewString("pragma");
+  kpp_level = NewString("level");
+  kpp_line = NewString("line");
+  kpp_include = NewString("include");
+  kpp_varargs = NewString("varargs");
+
+  kpp_dinclude = NewString("%include");
+  kpp_dimport = NewString("%import");
+  kpp_dbeginfile = NewString("%beginfile");
+  kpp_ddefine = NewString("%define");
+  kpp_dline = NewString("%line");
+
+
+  kpp_LINE = NewString("__LINE__");
+  kpp_FILE = NewString("__FILE__");
+
+  kpp_hash_if = NewString("#if");
+  kpp_hash_elif = NewString("#elif");
+
+  cpp = NewHash();
+  s = NewHash();
+  Setattr(cpp, kpp_symbols, s);
+  Delete(s);
+  Preprocessor_expr_init();	/* Initialize the expression evaluator */
+  included_files = NewHash();
+
+  id_scan = NewScanner();
+
+}
+
+void Preprocessor_delete(void) {
+  Delete(kpp_args);
+  Delete(kpp_define);
+  Delete(kpp_defined);
+  Delete(kpp_else);
+  Delete(kpp_elif);
+  Delete(kpp_endif);
+  Delete(kpp_expanded);
+  Delete(kpp_if);
+  Delete(kpp_ifdef);
+  Delete(kpp_ifndef);
+  Delete(kpp_name);
+  Delete(kpp_swigmacro);
+  Delete(kpp_symbols);
+  Delete(kpp_undef);
+  Delete(kpp_value);
+  Delete(kpp_error);
+  Delete(kpp_warning);
+  Delete(kpp_pragma);
+  Delete(kpp_level);
+  Delete(kpp_line);
+  Delete(kpp_include);
+  Delete(kpp_varargs);
+
+  Delete(kpp_dinclude);
+  Delete(kpp_dimport);
+  Delete(kpp_dbeginfile);
+  Delete(kpp_ddefine);
+  Delete(kpp_dline);
+
+  Delete(kpp_LINE);
+  Delete(kpp_FILE);
+
+  Delete(kpp_hash_if);
+  Delete(kpp_hash_elif);
+
+  Delete(cpp);
+  Delete(included_files);
+  Preprocessor_expr_delete();
+  DelScanner(id_scan);
+
+  Delete(dependencies);
+
+  Delete(Swig_add_directory(0));
+}
+
+/* -----------------------------------------------------------------------------
+ * void Preprocessor_include_all() - Instruct preprocessor to include all files
+ * ----------------------------------------------------------------------------- */
+void Preprocessor_include_all(int a) {
+  include_all = a;
+}
+
+void Preprocessor_import_all(int a) {
+  import_all = a;
+}
+
+void Preprocessor_ignore_missing(int a) {
+  ignore_missing = a;
+}
+
+void Preprocessor_error_as_warning(int a) {
+  error_as_warning = a;
+}
+
+
+/* -----------------------------------------------------------------------------
+ * Preprocessor_define()
+ *
+ * Defines a new C preprocessor symbol.   swigmacro specifies whether or not the macro has
+ * SWIG macro semantics.
+ * ----------------------------------------------------------------------------- */
+
+
+static String *Macro_vararg_name(const_String_or_char_ptr str, const_String_or_char_ptr line) {
+  String *varargname;
+  char *s, *dots;
+
+  s = Char(str);
+  dots = strchr(s, '.');
+  if (!dots) {
+    return NULL;
+  }
+
+  if (strcmp(dots, "...") != 0) {
+    Swig_error(Getfile(line), Getline(line), "Illegal macro argument name '%s'\n", str);
+    return NULL;
+  }
+  if (dots == s) {
+    varargname = NewString("__VA_ARGS__");
+  } else {
+    varargname = NewStringWithSize(s, (int)(dots - s));
+  }
+  return varargname;
+}
+
+Hash *Preprocessor_define(const_String_or_char_ptr _str, int swigmacro) {
+  String *macroname = 0, *argstr = 0, *macrovalue = 0, *file = 0, *s = 0;
+  Hash *macro = 0, *symbols = 0, *m1;
+  List *arglist = 0;
+  int c, line;
+  int varargs = 0;
+  String *str;
+
+  assert(cpp);
+  assert(_str);
+
+  /* First make sure that string is actually a string */
+  if (DohCheck(_str)) {
+    s = Copy(_str);
+    copy_location(_str, s);
+    str = s;
+  } else {
+    str = NewString((char *) _str);
+  }
+  Seek(str, 0, SEEK_SET);
+  line = Getline(str);
+  file = Getfile(str);
+
+  /* Skip over any leading whitespace */
+  skip_whitespace(str, 0);
+
+  /* Now look for a macro name */
+  macroname = NewStringEmpty();
+  copy_location(str, macroname);
+  while ((c = Getc(str)) != EOF) {
+    if (c == '(') {
+      argstr = NewStringEmpty();
+      copy_location(str, argstr);
+      /* It is a macro.  Go extract its argument string */
+      while ((c = Getc(str)) != EOF) {
+	if (c == ')')
+	  break;
+	else
+	  Putc(c, argstr);
+      }
+      if (c != ')') {
+	Swig_error(Getfile(argstr), Getline(argstr), "Missing \')\' in macro parameters\n");
+	goto macro_error;
+      }
+      break;
+    } else if (isidchar(c) || (c == '%')) {
+      Putc(c, macroname);
+    } else if (isspace(c)) {
+      break;
+    } else if (c == '\\') {
+      c = Getc(str);
+      if (c != '\n') {
+	Ungetc(c, str);
+	Ungetc('\\', str);
+	break;
+      }
+    } else {
+      Ungetc(c, str);
+      break;
+    }
+  }
+  if (!swigmacro)
+    skip_whitespace(str, 0);
+  macrovalue = NewStringEmpty();
+  copy_location(str, macrovalue);
+  while ((c = Getc(str)) != EOF) {
+    Putc(c, macrovalue);
+  }
+
+  /* If there are any macro arguments, convert into a list */
+  if (argstr) {
+    String *argname, *varargname;
+    arglist = NewList();
+    Seek(argstr, 0, SEEK_SET);
+    argname = NewStringEmpty();
+    while ((c = Getc(argstr)) != EOF) {
+      if (c == ',') {
+	varargname = Macro_vararg_name(argname, argstr);
+	if (varargname) {
+	  Delete(varargname);
+	  Swig_error(Getfile(argstr), Getline(argstr), "Variable length macro argument must be last parameter\n");
+	} else {
+	  Append(arglist, argname);
+	}
+	Delete(argname);
+	argname = NewStringEmpty();
+      } else if (isidchar(c) || (c == '.')) {
+	Putc(c, argname);
+      } else if (!(isspace(c) || (c == '\\'))) {
+	Delete(argname);
+	Swig_error(Getfile(argstr), Getline(argstr), "Illegal character in macro argument name\n");
+	goto macro_error;
+      }
+    }
+    if (Len(argname)) {
+      /* Check for varargs */
+      varargname = Macro_vararg_name(argname, argstr);
+      if (varargname) {
+	Append(arglist, varargname);
+	Delete(varargname);
+	varargs = 1;
+      } else {
+	Append(arglist, argname);
+      }
+    }
+    Delete(argname);
+  }
+
+  if (!swigmacro) {
+    Replace(macrovalue, "\\\n", " ", DOH_REPLACE_NOQUOTE);
+  }
+
+  /* Look for special # substitutions.   We only consider # that appears
+     outside of quotes and comments */
+
+  {
+    int state = 0;
+    char *cc = Char(macrovalue);
+    while (*cc) {
+      switch (state) {
+      case 0:
+	if (*cc == '#')
+	  *cc = '\001';
+	else if (*cc == '/')
+	  state = 10;
+	else if (*cc == '\'')
+	  state = 20;
+	else if (*cc == '\"')
+	  state = 30;
+	break;
+      case 10:
+	if (*cc == '*')
+	  state = 11;
+	else if (*cc == '/')
+	  state = 15;
+	else {
+	  state = 0;
+	  cc--;
+	}
+	break;
+      case 11:
+	if (*cc == '*')
+	  state = 12;
+	break;
+      case 12:
+	if (*cc == '/')
+	  state = 0;
+	else if (*cc != '*')
+	  state = 11;
+	break;
+      case 15:
+	if (*cc == '\n')
+	  state = 0;
+	break;
+      case 20:
+	if (*cc == '\'')
+	  state = 0;
+	if (*cc == '\\')
+	  state = 21;
+	break;
+      case 21:
+	state = 20;
+	break;
+      case 30:
+	if (*cc == '\"')
+	  state = 0;
+	if (*cc == '\\')
+	  state = 31;
+	break;
+      case 31:
+	state = 30;
+	break;
+      default:
+	break;
+      }
+      cc++;
+    }
+  }
+
+  /* Get rid of whitespace surrounding # */
+  /*  Replace(macrovalue,"#","\001",DOH_REPLACE_NOQUOTE); */
+  while (Replace(macrovalue, "\001 ", "\001", DOH_REPLACE_ANY) > 0) { }
+  while (Replace(macrovalue, " \001", "\001", DOH_REPLACE_ANY) > 0) { }
+  /* Replace '##' with a special token */
+  Replace(macrovalue, "\001\001", "\002", DOH_REPLACE_ANY);
+  /* Replace '#@' with a special token */
+  Replace(macrovalue, "\001@", "\004", DOH_REPLACE_ANY);
+  /* Replace '##@' with a special token */
+  Replace(macrovalue, "\002@", "\005", DOH_REPLACE_ANY);
+  if (varargs) {
+    /* Replace '__VA_OPT__' with a special token */
+    Replace(macrovalue, "__VA_OPT__", "\006", DOH_REPLACE_ID|DOH_REPLACE_ANY);
+  }
+
+  /* Go create the macro */
+  macro = NewHash();
+  Setattr(macro, kpp_name, macroname);
+
+  if (arglist) {
+    Setattr(macro, kpp_args, arglist);
+    Delete(arglist);
+    if (varargs) {
+      Setattr(macro, kpp_varargs, "1");
+    }
+  }
+  Setattr(macro, kpp_value, macrovalue);
+  Setline(macro, line);
+  Setfile(macro, file);
+  if (swigmacro) {
+    Setattr(macro, kpp_swigmacro, "1");
+  }
+  symbols = Getattr(cpp, kpp_symbols);
+  if ((m1 = Getattr(symbols, macroname))) {
+    if (!Checkattr(m1, kpp_value, macrovalue)) {
+      Swig_error(Getfile(macroname), Getline(macroname), "Macro '%s' redefined,\n", macroname);
+      Swig_error(Getfile(m1), Getline(m1), "previous definition of '%s'.\n", macroname);
+      goto macro_error;
+    }
+  } else {
+    Setattr(symbols, macroname, macro);
+    Delete(macro);
+  }
+
+  Delete(macroname);
+  Delete(macrovalue);
+
+  Delete(str);
+  Delete(argstr);
+  return macro;
+
+macro_error:
+  Delete(str);
+  Delete(argstr);
+  Delete(arglist);
+  Delete(macroname);
+  Delete(macrovalue);
+  return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * Preprocessor_undef()
+ *
+ * Undefines a macro.
+ * ----------------------------------------------------------------------------- */
+void Preprocessor_undef(const_String_or_char_ptr str) {
+  Hash *symbols;
+  assert(cpp);
+  symbols = Getattr(cpp, kpp_symbols);
+  Delattr(symbols, str);
+}
+
+/* -----------------------------------------------------------------------------
+ * Preprocessor_defined()
+ *
+ * Check if a macro is defined.
+ * ----------------------------------------------------------------------------- */
+int Preprocessor_defined(const_String_or_char_ptr str) {
+  Hash *symbols;
+  assert(cpp);
+  symbols = Getattr(cpp, kpp_symbols);
+  return Getattr(symbols, str) != NULL;
+}
+
+/* -----------------------------------------------------------------------------
+ * find_args()
+ *
+ * Isolates macro arguments and returns them in a list.   For each argument,
+ * leading and trailing whitespace is stripped (ala K&R, pg. 230).
+ * ----------------------------------------------------------------------------- */
+static List *find_args(String *s, int ismacro, String *macro_name) {
+  List *args;
+  String *str;
+  int c, level;
+  long pos;
+
+  /* Create a new list */
+  args = NewList();
+  copy_location(s, args);
+
+  /* First look for a '(' */
+  pos = Tell(s);
+  skip_whitespace(s, 0);
+
+  /* Now see if the next character is a '(' */
+  c = Getc(s);
+  if (c != '(') {
+    /* Not a macro, bail out now! */
+    assert(pos != -1);
+    (void)Seek(s, pos, SEEK_SET);
+    Delete(args);
+    return 0;
+  }
+  c = Getc(s);
+  /* Okay.  This appears to be a macro so we will start isolating arguments */
+  while (c != EOF) {
+    if (isspace(c)) {
+      skip_whitespace(s, 0);	/* Skip leading whitespace */
+      c = Getc(s);
+    }
+    str = NewStringEmpty();
+    copy_location(s, str);
+    level = 0;
+    while (c != EOF) {
+      if (c == '\"') {
+	Putc(c, str);
+	skip_tochar(s, '\"', str);
+	c = Getc(s);
+	continue;
+      } else if (c == '\'') {
+	Putc(c, str);
+	skip_tochar(s, '\'', str);
+	c = Getc(s);
+	continue;
+      } else if (c == '/') {
+        /* Ensure comments are ignored by eating up the characters */
+        c = Getc(s);
+        /* Handle / * ... * / type comments (multi-line) */
+        if (c == '*') {
+          while ((c = Getc(s)) != EOF) {
+            if (c == '*') {
+another_star:
+              c = Getc(s);
+              if (c == '/' || c == EOF)
+                break;
+	      if (c == '*') goto another_star;
+            }
+          }
+          c = Getc(s);
+          continue;
+        }
+        /* Handle // ... type comments (single-line) */
+        if (c == '/') {
+          while ((c = Getc(s)) != EOF) {
+            if (c == '\n') {
+                break;
+            }
+          }
+          c = Getc(s);
+          continue;
+        }
+        /* ensure char is available in the stream as this was not a comment*/
+        Ungetc(c, s);
+        c = '/';
+      }
+      if ((c == ',') && (level == 0))
+	break;
+      if ((c == ')') && (level == 0))
+	break;
+      Putc(c, str);
+      if (c == '(')
+	level++;
+      if (c == ')')
+	level--;
+      c = Getc(s);
+    }
+    if (level > 0) {
+      goto unterm;
+    }
+    Chop(str);
+    Append(args, str);
+    Delete(str);
+    if (c == ')')
+      return args;
+    c = Getc(s);
+  }
+unterm:
+  if (ismacro)
+    Swig_error(Getfile(args), Getline(args), "Unterminated call invoking macro '%s'\n", macro_name);
+  else
+    Swig_error(Getfile(args), Getline(args), "Unterminated call to '%s'\n", macro_name);
+  return args;
+}
+
+/* -----------------------------------------------------------------------------
+ * DOH *get_filename()
+ *
+ * Read a filename from str.   A filename can be enclosed in quotes, angle brackets,
+ * or bare.
+ * ----------------------------------------------------------------------------- */
+
+static String *get_filename(String *str, int *sysfile) {
+  String *fn;
+  int c;
+
+  fn = NewStringEmpty();
+  copy_location(str, fn);
+  c = Getc(str);
+  *sysfile = 0;
+  if (c == '\"') {
+    while (((c = Getc(str)) != EOF) && (c != '\"'))
+      Putc(c, fn);
+  } else if (c == '<') {
+    *sysfile = 1;
+    while (((c = Getc(str)) != EOF) && (c != '>'))
+      Putc(c, fn);
+  } else {
+    String *preprocessed_str;
+    Putc(c, fn);
+    while (((c = Getc(str)) != EOF) && (!isspace(c)))
+      Putc(c, fn);
+    if (isspace(c))
+      Ungetc(c, str);
+    preprocessed_str = Preprocessor_replace(fn, NULL);
+    Seek(preprocessed_str, 0, SEEK_SET);
+    Delete(fn);
+
+    fn = NewStringEmpty();
+    copy_location(preprocessed_str, fn);
+    c = Getc(preprocessed_str);
+    if (c == '\"') {
+      while (((c = Getc(preprocessed_str)) != EOF) && (c != '\"'))
+	Putc(c, fn);
+    } else if (c == '<') {
+      *sysfile = 1;
+      while (((c = Getc(preprocessed_str)) != EOF) && (c != '>'))
+	Putc(c, fn);
+    } else {
+      fn = Copy(preprocessed_str);
+    }
+    Delete(preprocessed_str);
+  }
+  Swig_filename_unescape(fn);
+  Swig_filename_correct(fn);
+  Seek(fn, 0, SEEK_SET);
+  return fn;
+}
+
+static String *get_options(String *str) {
+  int c;
+  c = Getc(str);
+  if (c == '(') {
+    String *opt;
+    int level = 1;
+    opt = NewString("(");
+    while (((c = Getc(str)) != EOF)) {
+      Putc(c, opt);
+      switch (c) {
+	case ')':
+	  level--;
+	  if (!level)
+	    return opt;
+	  break;
+	case '(':
+	  level++;
+	  break;
+	case '"':
+	  /* Skip over quoted strings */
+	  while (1) {
+	    c = Getc(str);
+	    if (c == EOF)
+	      goto bad;
+	    Putc(c, opt);
+	    if (c == '"')
+	      break;
+	    if (c == '\\') {
+	      c = Getc(str);
+	      if (c == EOF)
+		goto bad;
+	      Putc(c, opt);
+	    }
+	  }
+	  break;
+      }
+    }
+bad:
+    Delete(opt);
+    return 0;
+  } else {
+    Ungetc(c, str);
+    return 0;
+  }
+}
+
+/* -----------------------------------------------------------------------------
+ * expand_macro()
+ *
+ * Perform macro expansion and return a new string.  Returns NULL if some sort
+ * of error occurred.
+ * name - name of the macro
+ * args - arguments passed to the macro
+ * line_file - global context, used for line/file name when reporting errors
+ * ----------------------------------------------------------------------------- */
+
+static String *expand_macro(String *name, List *args, String *line_file) {
+  String *ns;
+  DOH *symbols, *macro, *margs, *mvalue, *temp, *tempa, *e;
+  int i, l;
+  int isvarargs = 0;
+
+  symbols = Getattr(cpp, kpp_symbols);
+  if (!symbols)
+    return 0;
+
+  /* See if the name is actually defined */
+  macro = Getattr(symbols, name);
+  if (!macro)
+    return 0;
+
+  if (macro_level == 0) {
+    /* Store the start of the macro should the macro contain __LINE__ and __FILE__ for expansion */
+    macro_start_line = Getline(args ? args : line_file);
+    macro_start_file = Getfile(args ? args : line_file);
+  }
+  macro_level++;
+
+  if (Getattr(macro, kpp_expanded)) {
+    ns = NewStringEmpty();
+    Append(ns, name);
+    if (args) {
+      int lenargs = Len(args);
+      if (lenargs)
+	Putc('(', ns);
+      for (i = 0; i < lenargs; i++) {
+	Append(ns, Getitem(args, i));
+	if (i < (lenargs - 1))
+	  Putc(',', ns);
+      }
+      if (i)
+	Putc(')', ns);
+    }
+    macro_level--;
+    return ns;
+  }
+
+  /* Get macro arguments and value */
+  mvalue = Getattr(macro, kpp_value);
+  assert(mvalue);
+  margs = Getattr(macro, kpp_args);
+
+  if (args && Getattr(macro, kpp_varargs)) {
+    isvarargs = 1;
+    /* Variable length argument macro.  We need to collect all of the extra arguments into a single argument */
+    if (Len(args) >= (Len(margs) - 1)) {
+      int i;
+      int vi, na;
+      String *vararg = NewStringEmpty();
+      vi = Len(margs) - 1;
+      na = Len(args);
+      for (i = vi; i < na; i++) {
+	Append(vararg, Getitem(args, i));
+	if ((i + 1) < na) {
+	  Append(vararg, ",");
+	}
+      }
+      /* Remove arguments */
+      for (i = vi; i < na; i++) {
+	Delitem(args, vi);
+      }
+      Append(args, vararg);
+      Delete(vararg);
+    }
+  }
+
+  if (args && margs && Len(margs) == 0 && Len(args) == 1 && Len(Getitem(args, 0)) == 0) {
+    /* FOO() can invoke a macro defined as FOO(X) as well as one defined FOO().
+     *
+     * Handle this by removing the only argument if it's empty and the macro
+     * expects no arguments.
+     *
+     * We don't need to worry about varargs here - a varargs macro will always have
+     * Len(margs) >= 1, since the varargs are put in the final macro argument.
+     */
+    Delitem(args, 0);
+  }
+
+  /* If there are arguments, see if they match what we were given */
+  if (args && (!margs || Len(margs) != Len(args))) {
+    if (margs && Len(margs) > (1 + isvarargs))
+      Swig_error(macro_start_file, macro_start_line, "Macro '%s' expects %d arguments\n", name, Len(margs) - isvarargs);
+    else if (margs && Len(margs) == (1 + isvarargs))
+      Swig_error(macro_start_file, macro_start_line, "Macro '%s' expects 1 argument\n", name);
+    else
+      Swig_error(macro_start_file, macro_start_line, "Macro '%s' expects no arguments\n", name);
+    macro_level--;
+    return 0;
+  }
+
+  /* If the macro expects arguments, but none were supplied, we leave it in place */
+  if (!args && margs) {
+    macro_level--;
+    return NewString(name);
+  }
+
+  /* Copy the macro value */
+  ns = Copy(mvalue);
+  copy_location(mvalue, ns);
+
+  /* Tag the macro as being expanded.   This is to avoid recursion in
+     macro expansion */
+
+  temp = NewStringEmpty();
+  tempa = NewStringEmpty();
+  if (args && margs) {
+    l = Len(margs);
+    for (i = 0; i < l; i++) {
+      DOH *arg, *aname;
+      String *reparg;
+      arg = Getitem(args, i);	/* Get an argument value */
+      reparg = Preprocessor_replace(arg, NULL);
+      aname = Getitem(margs, i);	/* Get macro argument name */
+      if (strchr(Char(ns), '\001')) {
+	/* Try to replace a quoted version of the argument */
+	Clear(temp);
+	Clear(tempa);
+	Printf(temp, "\001%s", aname);
+	Printf(tempa, "\"%s\"", arg);
+	Replace(ns, temp, tempa, DOH_REPLACE_ID_END);
+      }
+      if (isvarargs && i == l - 1) {
+	char *s = Char(ns);
+	char *a = s;
+	while ((a = strchr(a, '\006')) != NULL) {
+	  *a = ' ';
+	  while (isspace((unsigned char)*++a)) { }
+	  if (*a == '(') {
+	    char *e = a;
+	    int depth = 1;
+	    while (*++e) {
+	      if (*e == ')') {
+		if (--depth == 0) break;
+	      } else if (*e == '(') {
+		++depth;
+	      }
+	    }
+	    if (*e) {
+	      if (Len(arg) == 0) {
+		// Empty varargs so replace ( and ) and everything between with
+		// spaces.
+		memset(a, ' ', e - a + 1);
+	      } else {
+		// Non-empty varargs so replace ( and ) with spaces.
+		*a = ' ';
+		*e = ' ';
+	      }
+	    }
+	    a = e + 1;
+	  }
+	}
+      }
+
+      if (strchr(Char(ns), '\002')) {
+	/* Look for concatenation tokens */
+	Clear(temp);
+	Clear(tempa);
+	Printf(temp, "\002%s", aname);
+	Append(tempa, "\002\003");
+	Replace(ns, temp, tempa, DOH_REPLACE_ID_END);
+	if (isvarargs && i == l - 1 && Len(arg) == 0) {
+	  // ## followed by a zero length varargs macro argument - if preceded
+	  // by a comma (possibly with whitespace in between) we nuke the
+	  // comma.
+	  char *s = Char(ns);
+	  char *a = s + 1;
+	  while ((a = strstr(a, "\002\003")) != NULL) {
+	    char *t = a;
+	    while (--t >= s) {
+	      if (!isspace((unsigned char)*t)) {
+		if (*t == ',') *t = ' ';
+		break;
+	      }
+	    }
+	    // Advance 3 since we're only interested in \002\003 when it could
+	    // be preceded by a comma.
+	    a += 3;
+	  }
+	}
+
+	Clear(temp);
+	Clear(tempa);
+	Printf(temp, "%s\002", aname);
+	Append(tempa, "\003\002");
+	Replace(ns, temp, tempa, DOH_REPLACE_ID_BEGIN);
+      }
+
+      /* Non-standard macro expansion.   The value `x` is replaced by a quoted
+         version of the argument except that if the argument is already quoted
+         nothing happens */
+
+      if (strchr(Char(ns), '`')) {
+	String *rep;
+	char *c;
+	Clear(temp);
+	Printf(temp, "`%s`", aname);
+	c = Char(arg);
+	if (*c == '"') {
+	  rep = arg;
+	} else {
+	  Clear(tempa);
+	  Printf(tempa, "\"%s\"", arg);
+	  rep = tempa;
+	}
+	Replace(ns, temp, rep, DOH_REPLACE_ANY);
+      }
+
+      /* Non-standard mangle expansions.  
+         The #@Name is replaced by mangle_arg(Name). */
+      if (strchr(Char(ns), '\004')) {
+	String *marg = Swig_name_mangle_string(arg);
+	Clear(temp);
+	Printf(temp, "\004%s", aname);
+	Replace(ns, temp, marg, DOH_REPLACE_ID_END);
+	Delete(marg);
+      }
+      if (strchr(Char(ns), '\005')) {
+	String *marg = Swig_name_mangle_string(arg);
+	Clear(temp);
+	Clear(tempa);
+	Printf(temp, "\005%s", aname);
+	Printf(tempa, "\"%s\"", marg);
+	Replace(ns, temp, tempa, DOH_REPLACE_ID_END);
+	Delete(marg);
+      }
+
+      /*      Replace(ns, aname, arg, DOH_REPLACE_ID); */
+      Replace(ns, aname, reparg, DOH_REPLACE_ID);	/* Replace expanded args */
+      Replace(ns, "\003", arg, DOH_REPLACE_ANY);	/* Replace unexpanded arg */
+      Delete(reparg);
+    }
+  }
+  Replace(ns, "\002", "", DOH_REPLACE_ANY);	/* Get rid of concatenation tokens */
+  Replace(ns, "\001", "#", DOH_REPLACE_ANY);	/* Put # back (non-standard C) */
+  Replace(ns, "\004", "#@", DOH_REPLACE_ANY);	/* Put # back (non-standard C) */
+
+  /* Expand this macro even further */
+  Setattr(macro, kpp_expanded, "1");
+
+  e = Preprocessor_replace(ns, line_file);
+
+  Delattr(macro, kpp_expanded);
+  Delete(ns);
+
+  if (Getattr(macro, kpp_swigmacro)) {
+    String *g;
+    String *f = NewStringEmpty();
+    Seek(e, 0, SEEK_SET);
+    copy_location(macro, e);
+    g = Preprocessor_parse(e);
+
+#if 0
+    /* Drop the macro in place, but with a marker around it */
+    Printf(f, "/*@%s,%d,%s@*/%s/*@@*/", Getfile(macro), Getline(macro), name, g);
+#else
+    /* Use simplified around markers to properly count lines in cscanner.c */
+    if (strchr(Char(g), '\n')) {
+      Printf(f, "/*@SWIG:%s,%d,%s@*/%s/*@SWIG@*/", Getfile(macro), Getline(macro), name, g);
+#if 0
+      Printf(f, "/*@SWIG:%s@*/%s/*@SWIG@*/", name, g);
+#endif
+    } else {
+      Append(f, g);
+    }
+#endif
+
+    Delete(g);
+    Delete(e);
+    e = f;
+  }
+  macro_level--;
+  Delete(temp);
+  Delete(tempa);
+  return e;
+}
+
+/* -----------------------------------------------------------------------------
+ * DOH *Preprocessor_replace(DOH *s, DOH *line_file)
+ *
+ * Performs a macro substitution on a string s.  Returns a new string with
+ * substitutions applied.   This function works by walking down s and looking
+ * for identifiers.   When found, a check is made to see if they are macros
+ * which are then expanded.
+ * ----------------------------------------------------------------------------- */
+
+/* #define SWIG_PUT_BUFF  */
+
+static DOH *Preprocessor_replace(DOH *s, DOH *line_file) {
+  DOH *ns, *symbols, *m;
+  int c, i, state = 0;
+  String *id = NewStringEmpty();
+
+  assert(cpp);
+  symbols = Getattr(cpp, kpp_symbols);
+
+  ns = NewStringEmpty();
+  copy_location(s, ns);
+  Seek(s, 0, SEEK_SET);
+
+  /* Try to locate identifiers in s and replace them with macro replacements */
+  while ((c = Getc(s)) != EOF) {
+    switch (state) {
+    case 0:
+      if (isidentifier(c)) {
+	Clear(id);
+	Putc(c, id);
+	state = 4;
+      } else if (c == '%') {
+	Clear(id);
+	Putc(c, id);
+	state = 2;
+      } else if (c == '#') {
+	Clear(id);
+	Putc(c, id);
+	state = 4;
+      } else if (c == '\"') {
+	Putc(c, ns);
+	skip_tochar(s, '\"', ns);
+      } else if (c == '\'') {
+	Putc(c, ns);
+	skip_tochar(s, '\'', ns);
+      } else if (c == '/') {
+	Putc(c, ns);
+	state = 10;
+      } else if (c == '\\') {
+	Putc(c, ns);
+	c = Getc(s);
+	if (c == '\n') {
+	  Putc(c, ns);
+	} else {
+	  Ungetc(c, s);
+	}
+      } else if (c == '\n') {
+	Putc(c, ns);
+	expand_defined_operator = 0;
+      } else {
+	Putc(c, ns);
+      }
+      break;
+    case 2:
+      /* Found '%#' */
+      if (c == '#') {
+	Putc(c, id);
+	state = 4;
+      } else {
+	Ungetc(c, s);
+	state = 4;
+      }
+      break;
+    case 4:			/* An identifier */
+      if (isidchar(c)) {
+	Putc(c, id);
+	state = 4;
+      } else {
+	/* We found the end of a valid identifier */
+	Ungetc(c, s);
+	/* See if this is the special "defined" operator */
+       	if (Equal(kpp_defined, id)) {
+	  if (expand_defined_operator) {
+	    int lenargs = 0;
+	    DOH *args = 0;
+	    /* See whether or not a parenthesis has been used */
+	    skip_whitespace(s, 0);
+	    c = Getc(s);
+	    if (c == '(') {
+	      Ungetc(c, s);
+	      args = find_args(s, 0, kpp_defined);
+	    } else if (isidchar(c)) {
+	      DOH *arg = NewStringEmpty();
+	      args = NewList();
+	      Putc(c, arg);
+	      while (((c = Getc(s)) != EOF)) {
+		if (!isidchar(c)) {
+		  Ungetc(c, s);
+		  break;
+		}
+		Putc(c, arg);
+	      }
+	      if (Len(arg))
+		Append(args, arg);
+	      Delete(arg);
+	    } else {
+	      Seek(s, -1, SEEK_CUR);
+	    }
+	    lenargs = Len(args);
+	    if ((!args) || (!lenargs)) {
+	      /* This is not a defined() operator. */
+	      Append(ns, id);
+	      state = 0;
+	      break;
+	    }
+	    for (i = 0; i < lenargs; i++) {
+	      DOH *o = Getitem(args, i);
+	      if (!Getattr(symbols, o)) {
+		break;
+	      }
+	    }
+	    if (i < lenargs)
+	      Putc('0', ns);
+	    else
+	      Putc('1', ns);
+	    Delete(args);
+	  } else {
+	    Append(ns, id);
+	  }
+	  state = 0;
+	  break;
+	} else if (Equal(kpp_LINE, id)) {
+	  Printf(ns, "%d", macro_level > 0 ? macro_start_line : Getline(s));
+	  state = 0;
+	  break;
+	} else if (Equal(kpp_FILE, id)) {
+	  String *fn = Copy(macro_level > 0 ? macro_start_file : Getfile(s));
+	  Replaceall(fn, "\\", "\\\\");
+	  Printf(ns, "\"%s\"", fn);
+	  Delete(fn);
+	  state = 0;
+	  break;
+	} else if (Equal(kpp_hash_if, id) || Equal(kpp_hash_elif, id)) {
+	  expand_defined_operator = 1;
+	  Append(ns, id);
+	} else if (Equal("#ifdef", id) || Equal("#ifndef", id)) {
+	  /* Evaluate the defined-ness check and substitute `#if 0` or `#if 1`. */
+	  int allow = 0;
+	  skip_whitespace(s, 0);
+	  c = Getc(s);
+	  if (isidchar(c)) {
+	    DOH *arg = NewStringEmpty();
+	    Putc(c, arg);
+	    while (((c = Getc(s)) != EOF)) {
+	      if (!isidchar(c)) {
+		Ungetc(c, s);
+		break;
+	      }
+	      Putc(c, arg);
+	    }
+	    if (Equal("#ifdef", id)) {
+	      if (Getattr(symbols, arg)) allow = 1;
+	    } else {
+	      if (!Getattr(symbols, arg)) allow = 1;
+	    }
+	    Delete(arg);
+	  } else {
+	    Ungetc(c, s);
+	    Swig_error(Getfile(s), Getline(s), "Missing identifier for %s.\n", id);
+	  }
+	  if (allow) {
+	    Append(ns, "#if 1");
+	  } else {
+	    Append(ns, "#if 0");
+	  }
+	} else if ((m = Getattr(symbols, id))) {
+	  /* See if the macro is defined in the preprocessor symbol table */
+	  DOH *args = 0;
+	  DOH *e;
+	  int macro_additional_lines = 0;
+	  /* See if the macro expects arguments */
+	  if (Getattr(m, kpp_args)) {
+	    /* Yep.  We need to go find the arguments and do a substitution */
+	    int line = Getline(s);
+	    args = find_args(s, 1, id);
+	    macro_additional_lines = Getline(s) - line;
+	    assert(macro_additional_lines >= 0);
+	  } else {
+	    args = 0;
+	  }
+	  e = expand_macro(id, args, s);
+	  if (e) {
+	    Append(ns, e);
+	  }
+	  while (macro_additional_lines--) {
+	    Putc('\n', ns);
+	  }
+	  Delete(e);
+	  Delete(args);
+	} else {
+	  Append(ns, id);
+	}
+	state = 0;
+      }
+      break;
+    case 10:
+      if (c == '/')
+	state = 11;
+      else if (c == '*')
+	state = 12;
+      else {
+	Ungetc(c, s);
+	state = 0;
+	break;
+      }
+      Putc(c, ns);
+      break;
+    case 11:
+      /* in C++ comment */
+      Putc(c, ns);
+      if (c == '\n') {
+	expand_defined_operator = 0;
+	state = 0;
+      }
+      break;
+    case 12:
+      /* in C comment */
+      Putc(c, ns);
+      if (c == '*')
+	state = 13;
+      break;
+    case 13:
+      Putc(c, ns);
+      if (c == '/')
+	state = 0;
+      else if (c != '*')
+	state = 12;
+      break;
+    default:
+      state = 0;
+      break;
+    }
+  }
+
+  /* Identifier at the end */
+  if (state == 2 || state == 4) {
+    /* See if this is the special "defined" operator */
+    if (Equal(kpp_defined, id)) {
+      Swig_error(Getfile(s), Getline(s), "No arguments given to defined()\n");
+    } else if (Equal(kpp_LINE, id)) {
+      Printf(ns, "%d", macro_level > 0 ? macro_start_line : Getline(s));
+    } else if (Equal(kpp_FILE, id)) {
+      String *fn = Copy(macro_level > 0 ? macro_start_file : Getfile(s));
+      Replaceall(fn, "\\", "\\\\");
+      Printf(ns, "\"%s\"", fn);
+      Delete(fn);
+    } else if ((m = Getattr(symbols, id))) {
+      /* Yes.  There is a macro here */
+      /* If it expects arguments, they must come from `line_file` */
+      DOH *args = 0;
+      DOH *e;
+      int macro_additional_lines = 0;
+      /* See if the macro expects arguments */
+      if (Getattr(m, kpp_args) && line_file) {
+        /* Yep.  We need to go find the arguments and do a substitution */
+        int line = Getline(line_file);
+        args = find_args(line_file, 1, id);
+        macro_additional_lines = Getline(line_file) - line;
+        assert(macro_additional_lines >= 0);
+      } else {
+        args = 0;
+      }
+      e = expand_macro(id, args, s);
+      if (e) {
+	Append(ns, e);
+      }
+      while (macro_additional_lines--) {
+	Putc('\n', ns);
+      }
+      Delete(e);
+      Delete(args);
+    } else {
+      Append(ns, id);
+    }
+  }
+  Delete(id);
+  return ns;
+}
+
+
+/* -----------------------------------------------------------------------------
+ * int checkpp_id(DOH *s)
+ *
+ * Checks the string s to see if it contains any unresolved identifiers.  This
+ * function contains the heuristic that determines whether or not a macro
+ * definition passes through the preprocessor as a constant declaration.
+ * ----------------------------------------------------------------------------- */
+static int checkpp_id(DOH *s) {
+  int c;
+  int hastok = 0;
+  Scanner *scan = id_scan;
+
+  Seek(s, 0, SEEK_SET);
+
+  Scanner_clear(scan);
+  s = Copy(s);
+  Seek(s, SEEK_SET, 0);
+  Scanner_push(scan, s);
+  while ((c = Scanner_token(scan))) {
+    hastok = 1;
+    if ((c == SWIG_TOKEN_ID) || (c == SWIG_TOKEN_LBRACE) || (c == SWIG_TOKEN_RBRACE))
+      return 1;
+  }
+  if (!hastok)
+    return 1;
+  return 0;
+}
+
+/* addline().  Utility function for adding lines to a chunk */
+static void addline(DOH *s1, DOH *s2, int allow) {
+  if (allow) {
+    Append(s1, s2);
+  } else {
+    int len = Len(s2);
+    for (int i = 0; i < len; ++i) {
+      if (Char(s2)[i] == '\n')
+	Putc('\n', s1);
+    }
+  }
+}
+
+static void add_chunk(DOH *ns, DOH *chunk, int allow) {
+  DOH *echunk;
+  Seek(chunk, 0, SEEK_SET);
+  if (allow) {
+    echunk = Preprocessor_replace(chunk, NULL);
+    addline(ns, echunk, allow);
+    Delete(echunk);
+  } else {
+    addline(ns, chunk, 0);
+  }
+  Clear(chunk);
+}
+
+/*
+  push/pop_imported(): helper functions for defining and undefining
+  SWIGIMPORTED (when %importing a file).
+ */
+static void push_imported(void) {
+  if (imported_depth == 0) {
+    Preprocessor_define("SWIGIMPORTED 1", 0);
+  }
+  ++imported_depth;
+}
+
+static void pop_imported(void) {
+  --imported_depth;
+  if (imported_depth == 0) {
+    Preprocessor_undef("SWIGIMPORTED");
+  }
+}
+
+
+/* -----------------------------------------------------------------------------
+ * Preprocessor_parse()
+ *
+ * Parses the string s.  Returns a new string containing the preprocessed version.
+ *
+ * Parsing rules :
+ *       1.  Lines starting with # are C preprocessor directives
+ *       2.  Macro expansion inside strings is not allowed
+ *       3.  All code inside false conditionals is changed to blank lines
+ *       4.  Code in %{, %} is not parsed because it may need to be
+ *           included inline (with all preprocessor directives included).
+ * ----------------------------------------------------------------------------- */
+
+String *Preprocessor_parse(String *s) {
+  String *ns;			/* New string containing the preprocessed text */
+  String *chunk, *decl;
+  Hash *symbols;
+  String *id = 0, *value = 0, *comment = 0;
+  int i, state, e, c;
+  int start_line = 0;
+  int allow = 1;
+  int level = 0;
+  int dlevel = 0;
+  int filelevel = 0;
+  int mask = 0;
+  int start_level = 0;
+  int cpp_lines = 0;
+  int cond_lines[256];
+
+  /* Blow away all carriage returns */
+  Replace(s, "\015", "", DOH_REPLACE_ANY);
+
+  ns = NewStringEmpty();	/* Return result */
+
+  decl = NewStringEmpty();
+  id = NewStringEmpty();
+  value = NewStringEmpty();
+  comment = NewStringEmpty();
+  chunk = NewStringEmpty();
+  copy_location(s, chunk);
+  copy_location(s, ns);
+  symbols = Getattr(cpp, kpp_symbols);
+
+  state = 0;
+  while ((c = Getc(s)) != EOF) {
+    switch (state) {
+    case 0:			/* Initial state - in first column */
+      /* Look for C preprocessor directives.   Otherwise, go directly to state 1 */
+      if (c == '#') {
+	copy_location(s, chunk);
+	add_chunk(ns, chunk, allow);
+	cpp_lines = 1;
+	state = 40;
+      } else if (isspace(c)) {
+	Putc(c, chunk);
+	skip_whitespace(s, chunk);
+      } else {
+	state = 1;
+	Ungetc(c, s);
+      }
+      break;
+    case 1: {			/* Non-preprocessor directive */
+      /* Look for SWIG directives */
+state1:
+      if (c == '%') {
+	state = 100;
+	break;
+      }
+      Putc(c, chunk);
+      if (c == '\n')
+	state = 0;
+      else if (c == '\"') {
+	start_line = Getline(s);
+	if (skip_tochar(s, '\"', chunk) < 0) {
+	  Swig_error(Getfile(s), start_line, "Unterminated string constant\n");
+	}
+      } else if (c == '\'') {
+	start_line = Getline(s);
+	if (skip_tochar(s, '\'', chunk) < 0) {
+	  Swig_error(Getfile(s), start_line, "Unterminated character constant\n");
+	}
+      } else if (c == '/')
+	state = 30;		/* Comment */
+      break;
+    }
+
+    case 30:			/* Possibly a comment string of some sort */
+      start_line = Getline(s);
+      if (c == '/')
+	state = 31;
+      else if (c == '*')
+	state = 32;
+      else {
+	state = 1;
+	goto state1; /* Process this character the same as if it wasn't preceded by a `/`. */
+      }
+      Putc(c, chunk);
+      break;
+    case 31:
+      Putc(c, chunk);
+      if (c == '\n')
+	state = 0;
+      break;
+    case 32:
+      Putc(c, chunk);
+      if (c == '*')
+	state = 33;
+      break;
+    case 33:
+      Putc(c, chunk);
+      if (c == '/')
+	state = 1;
+      else if (c != '*')
+	state = 32;
+      break;
+
+    case 40:			/* Start of a C preprocessor directive */
+      if (c == '\n') {
+	Putc('\n', chunk);
+	state = 0;
+      } else if (isspace(c)) {
+	state = 40;
+      } else {
+	/* Got the start of a preprocessor directive */
+	Ungetc(c, s);
+	Clear(id);
+	copy_location(s, id);
+	state = 41;
+      }
+      break;
+
+    case 41:			/* Build up the name of the preprocessor directive */
+      if ((isspace(c) || (!isidchar(c)))) {
+	Clear(value);
+	Clear(comment);
+	if (c == '\n') {
+	  Ungetc(c, s);
+	  state = 50;
+	} else {
+	  state = 42;
+	  if (!isspace(c)) {
+	    Ungetc(c, s);
+	  }
+	}
+
+	copy_location(s, value);
+	break;
+      }
+      Putc(c, id);
+      break;
+
+    case 42:			/* Strip any leading space after the preprocessor directive (before preprocessor value) */
+      if (isspace(c)) {
+	if (c == '\n') {
+	  Ungetc(c, s);
+	  state = 50;
+	}
+	break;
+      }
+      state = 43;
+      /* FALL THRU */
+
+    case 43:
+      /* Get preprocessor value */
+      if (c == '\n') {
+	Ungetc(c, s);
+	state = 50;
+      } else if (c == '/') {
+	state = 45;
+      } else if (c == '\"') {
+	Putc(c, value);
+	skip_tochar_or_eol(s, '\"', value);
+      } else if (c == '\'') {
+	Putc(c, value);
+	skip_tochar_or_eol(s, '\'', value);
+      } else {
+	Putc(c, value);
+	if (c == '\\')
+	  state = 44;
+      }
+      break;
+
+    case 44:
+      if (c == '\n') {
+	Putc(c, value);
+	cpp_lines++;
+      } else {
+	Ungetc(c, s);
+      }
+      state = 43;
+      break;
+
+      /* States 45-48 are used to remove, but retain comments from macro values.  The comments
+         will be placed in the output in an alternative form */
+
+    case 45:
+      if (c == '/')
+	state = 46;
+      else if (c == '*')
+	state = 47;
+      else if (c == '\n') {
+	Putc('/', value);
+	Ungetc(c, s);
+	state = 50;
+      } else {
+	Putc('/', value);
+	Putc(c, value);
+	state = 43;
+      }
+      break;
+    case 46: /* in C++ comment */
+      if (c == '\n') {
+	Ungetc(c, s);
+	state = 50;
+      } else
+	Putc(c, comment);
+      break;
+    case 47: /* in C comment */
+      if (c == '*')
+	state = 48;
+      else
+	Putc(c, comment);
+      break;
+    case 48:
+      if (c == '/')
+	state = 43;
+      else if (c == '*')
+	Putc(c, comment);
+      else {
+	Putc('*', comment);
+	Putc(c, comment);
+	state = 47;
+      }
+      break;
+    case 50:
+      /* Check for various preprocessor directives */
+      Chop(value);
+      if (Equal(id, kpp_define)) {
+	if (allow) {
+	  DOH *m, *v, *v1;
+	  Seek(value, 0, SEEK_SET);
+	  m = Preprocessor_define(value, 0);
+	  if ((m) && !(Getattr(m, kpp_args))) {
+	    v = Copy(Getattr(m, kpp_value));
+	    copy_location(m, v);
+	    if (Len(v)) {
+	      Swig_error_silent(1);
+	      v1 = Preprocessor_replace(v, NULL);
+	      Swig_error_silent(0);
+	      /*              Printf(stdout,"checking '%s'\n", v1); */
+	      if (!checkpp_id(v1)) {
+		if (Len(comment) == 0)
+		  Printf(ns, "%%constant %s = %s;\n", Getattr(m, kpp_name), v1);
+		else
+		  Printf(ns, "%%constant %s = %s; /*%s*/\n", Getattr(m, kpp_name), v1, comment);
+		cpp_lines--;
+	      }
+	      Delete(v1);
+	    }
+	    Delete(v);
+	  }
+	}
+      } else if (Equal(id, kpp_undef)) {
+	if (allow)
+	  Preprocessor_undef(value);
+      } else if (Equal(id, kpp_ifdef)) {
+	cond_lines[level] = Getline(id);
+	level++;
+	if (allow) {
+	  start_level = level;
+	  if (Len(value) > 0) {
+	    /* See if the identifier is in the hash table */
+	    if (!Getattr(symbols, value))
+	      allow = 0;
+	  } else {
+	    Swig_error(Getfile(s), Getline(id), "Missing identifier for #ifdef.\n");
+	    allow = 0;
+	  }
+	  mask = 1;
+	}
+      } else if (Equal(id, kpp_ifndef)) {
+	cond_lines[level] = Getline(id);
+	level++;
+	if (allow) {
+	  start_level = level;
+	  if (Len(value) > 0) {
+	    /* See if the identifier is in the hash table */
+	    if (Getattr(symbols, value))
+	      allow = 0;
+	  } else {
+	    Swig_error(Getfile(s), Getline(id), "Missing identifier for #ifndef.\n");
+	    allow = 0;
+	  }
+	  mask = 1;
+	}
+      } else if (Equal(id, kpp_else)) {
+	if (level <= 0) {
+	  Swig_error(Getfile(s), Getline(id), "Misplaced #else.\n");
+	} else {
+	  cond_lines[level - 1] = Getline(id);
+	  if (Len(value) != 0)
+	    Swig_warning(WARN_PP_UNEXPECTED_TOKENS, Getfile(s), Getline(id), "Unexpected tokens after #else directive.\n");
+	  if (allow) {
+	    allow = 0;
+	    mask = 0;
+	  } else if (level == start_level) {
+	    allow = 1 * mask;
+	  }
+	}
+      } else if (Equal(id, kpp_endif)) {
+	level--;
+	if (level < 0) {
+	  Swig_error(Getfile(id), Getline(id), "Extraneous #endif.\n");
+	  level = 0;
+	} else {
+	  if (level < start_level) {
+	    if (Len(value) != 0)
+	      Swig_warning(WARN_PP_UNEXPECTED_TOKENS, Getfile(s), Getline(id), "Unexpected tokens after #endif directive.\n");
+	    allow = 1;
+	    start_level--;
+	  }
+	}
+      } else if (Equal(id, kpp_if)) {
+	cond_lines[level] = Getline(id);
+	level++;
+	if (allow) {
+	  int val;
+	  String *sval;
+	  expand_defined_operator = 1;
+	  sval = Preprocessor_replace(value, NULL);
+	  start_level = level;
+	  Seek(sval, 0, SEEK_SET);
+	  /*      Printf(stdout,"Evaluating '%s'\n", sval); */
+	  if (Len(sval) > 0) {
+	    val = Preprocessor_expr(sval, &e);
+	    if (e) {
+	      const char *msg = Preprocessor_expr_error();
+	      Seek(value, 0, SEEK_SET);
+	      Swig_warning(WARN_PP_EVALUATION, Getfile(value), Getline(value), "Could not evaluate expression '%s'\n", value);
+	      if (msg)
+		Swig_warning(WARN_PP_EVALUATION, Getfile(value), Getline(value), "%s\n", msg);
+	      allow = 0;
+	    } else {
+	      if (val == 0)
+		allow = 0;
+	    }
+	  } else {
+	    Swig_error(Getfile(s), Getline(id), "Missing expression for #if.\n");
+	    allow = 0;
+	  }
+	  expand_defined_operator = 0;
+	  mask = 1;
+	}
+      } else if (Equal(id, kpp_elif)) {
+	if (level == 0) {
+	  Swig_error(Getfile(s), Getline(id), "Misplaced #elif.\n");
+	} else {
+	  cond_lines[level - 1] = Getline(id);
+	  if (allow) {
+	    allow = 0;
+	    mask = 0;
+	  } else if (level == start_level) {
+	    int val;
+	    String *sval;
+	    expand_defined_operator = 1;
+	    sval = Preprocessor_replace(value, NULL);
+	    Seek(sval, 0, SEEK_SET);
+	    if (Len(sval) > 0) {
+	      val = Preprocessor_expr(sval, &e);
+	      if (e) {
+		const char *msg = Preprocessor_expr_error();
+		Seek(value, 0, SEEK_SET);
+		Swig_warning(WARN_PP_EVALUATION, Getfile(value), Getline(value), "Could not evaluate expression '%s'\n", value);
+		if (msg)
+		  Swig_warning(WARN_PP_EVALUATION, Getfile(value), Getline(value), "%s\n", msg);
+		allow = 0;
+	      } else {
+		if (val)
+		  allow = 1 * mask;
+		else
+		  allow = 0;
+	      }
+	    } else {
+	      Swig_error(Getfile(s), Getline(id), "Missing expression for #elif.\n");
+	      allow = 0;
+	    }
+	    expand_defined_operator = 0;
+	  }
+	}
+      } else if (Equal(id, kpp_warning)) {
+	if (allow) {
+	  Swig_warning(WARN_PP_CPP_WARNING, Getfile(s), Getline(id), "CPP #warning, \"%s\".\n", value);
+	}
+      } else if (Equal(id, kpp_error)) {
+	if (allow) {
+	  if (error_as_warning) {
+	    Swig_warning(WARN_PP_CPP_ERROR, Getfile(s), Getline(id), "CPP #error \"%s\".\n", value);
+	  } else {
+	    Swig_error(Getfile(s), Getline(id), "CPP #error \"%s\". Use the -cpperraswarn option to continue swig processing.\n", value);
+	  }
+	}
+      } else if (Equal(id, kpp_line)) {
+      } else if (Equal(id, kpp_include)) {
+	if (((include_all) || (import_all)) && (allow)) {
+	  String *s1, *s2, *fn;
+	  String *dirname;
+	  int sysfile = 0;
+	  if (include_all && import_all) {
+	    Swig_warning(WARN_PP_INCLUDEALL_IMPORTALL, Getfile(s), Getline(id), "Both includeall and importall are defined: using includeall.\n");
+	    import_all = 0;
+	  }
+	  Seek(value, 0, SEEK_SET);
+	  fn = get_filename(value, &sysfile);
+	  s1 = cpp_include(fn, sysfile);
+	  if (s1) {
+	    if (include_all)
+	      Printf(ns, "%%includefile \"%s\" %%beginfile\n", Swig_filename_escape(Swig_last_file()));
+	    else if (import_all) {
+	      Printf(ns, "%%importfile \"%s\" %%beginfile\n", Swig_filename_escape(Swig_last_file()));
+	      push_imported();
+	    }
+
+	    /* See if the filename has a directory component */
+	    dirname = Swig_file_dirname(Swig_last_file());
+	    if (sysfile || !Len(dirname)) {
+	      Delete(dirname);
+	      dirname = 0;
+	    }
+	    if (dirname) {
+	      int len = Len(dirname);
+	      Delslice(dirname, len - 1, len); /* Kill trailing directory delimiter */
+	      Swig_push_directory(dirname);
+	    }
+	    s2 = Preprocessor_parse(s1);
+	    addline(ns, s2, allow);
+	    Append(ns, "%endoffile");
+	    if (dirname) {
+	      Swig_pop_directory();
+	    }
+	    if (import_all) {
+	      pop_imported();
+	    }
+	    Delete(s2);
+	    Delete(dirname);
+	    Delete(s1);
+	  }
+	  Delete(fn);
+	}
+      } else if (Equal(id, kpp_pragma)) {
+	if (Strncmp(value, "SWIG ", 5) == 0) {
+	  char *c = Char(value) + 5;
+	  while (*c && (isspace((int) *c)))
+	    c++;
+	  if (*c) {
+	    if (strncmp(c, "nowarn=", 7) == 0) {
+	      String *val = NewString(c + 7);
+	      String *nowarn = Preprocessor_replace(val, NULL);
+	      Swig_warnfilter(nowarn, 1);
+	      Delete(nowarn);
+	      Delete(val);
+	    } else if (strncmp(c, "cpperraswarn=", 13) == 0) {
+	      error_as_warning = atoi(c + 13);
+	    } else {
+              Swig_error(Getfile(s), Getline(id), "Unknown SWIG pragma: %s\n", c);
+            }
+	  }
+	}
+      } else if (Equal(id, kpp_level)) {
+	Swig_error(Getfile(s), Getline(id), "cpp debug: level = %d, startlevel = %d\n", level, start_level);
+      } else if (Equal(id, "")) {
+	/* Null directive */
+      } else if (is_digits(id)) {
+	/* A gcc linemarker of the form '# linenum filename flags' (resulting from running gcc -E) */
+      } else {
+	/* Ignore unknown preprocessor directives which are inside an inactive
+	 * conditional (github issue #394). */
+	if (allow)
+	  Swig_error(Getfile(s), Getline(id), "Unknown SWIG preprocessor directive: %s (if this is a block of target language code, delimit it with %%{ and %%})\n", id);
+      }
+      for (i = 0; i < cpp_lines; i++)
+	Putc('\n', ns);
+      state = 0;
+      break;
+
+      /* SWIG directives  */
+    case 100:
+      /* %{,%} block  */
+      if (c == '{') {
+	start_line = Getline(s);
+	copy_location(s, chunk);
+	add_chunk(ns, chunk, allow);
+	Putc('%', chunk);
+	Putc(c, chunk);
+	state = 105;
+      }
+      /* %#cpp -  an embedded C preprocessor directive (we strip off the %)  */
+      else if (c == '#') {
+	add_chunk(ns, chunk, allow);
+	Putc(c, chunk);
+	state = 107;
+      } else if (isidentifier(c)) {
+	Clear(decl);
+	Putc('%', decl);
+	Putc(c, decl);
+	state = 110;
+      } else {
+	Putc('%', chunk);
+	Putc(c, chunk);
+	state = 1;
+      }
+      break;
+
+    case 105:
+      Putc(c, chunk);
+      if (c == '%')
+	state = 106;
+      break;
+
+    case 106:
+      Putc(c, chunk);
+      if (c == '}') {
+	state = 1;
+	addline(ns, chunk, allow);
+	Clear(chunk);
+	copy_location(s, chunk);
+      } else {
+	state = 105;
+      }
+      break;
+
+    case 107:
+      Putc(c, chunk);
+      if (c == '\n') {
+	addline(ns, chunk, allow);
+	Clear(chunk);
+	state = 0;
+      } else if (c == '\\') {
+	state = 108;
+      }
+      break;
+
+    case 108:
+      Putc(c, chunk);
+      state = 107;
+      break;
+
+    case 110:
+      if (!isidchar(c)) {
+	Ungetc(c, s);
+	/* Look for common SWIG directives  */
+	if (Equal(decl, kpp_dinclude) || Equal(decl, kpp_dimport)) {
+	  /* Got some kind of file inclusion directive, eg: %import(option1="value1") "filename" */
+	  if (allow) {
+	    DOH *s1, *s2, *fn, *opt;
+	    String *options_whitespace = NewStringEmpty();
+	    String *filename_whitespace = NewStringEmpty();
+	    int sysfile = 0;
+
+	    skip_whitespace(s, options_whitespace);
+	    opt = get_options(s);
+
+	    skip_whitespace(s, filename_whitespace);
+	    fn = get_filename(s, &sysfile);
+	    s1 = cpp_include(fn, sysfile);
+	    if (s1) {
+	      String *dirname;
+	      copy_location(s, chunk);
+	      add_chunk(ns, chunk, allow);
+	      Printf(ns, "%sfile%s%s%s\"%s\" %%beginfile\n", decl, options_whitespace, opt, filename_whitespace, Swig_filename_escape(Swig_last_file()));
+	      if (Equal(decl, kpp_dimport)) {
+		push_imported();
+	      }
+	      dirname = Swig_file_dirname(Swig_last_file());
+	      if (sysfile || !Len(dirname)) {
+		Delete(dirname);
+		dirname = 0;
+	      }
+	      if (dirname) {
+		int len = Len(dirname);
+		Delslice(dirname, len - 1, len); /* Kill trailing directory delimiter */
+		Swig_push_directory(dirname);
+	      }
+	      s2 = Preprocessor_parse(s1);
+	      if (dirname) {
+		Swig_pop_directory();
+	      }
+	      if (Equal(decl, kpp_dimport)) {
+		pop_imported();
+	      }
+	      addline(ns, s2, allow);
+	      Append(ns, "%endoffile");
+	      Delete(s2);
+	      Delete(dirname);
+	      Delete(s1);
+	    }
+	    Delete(fn);
+	    Delete(filename_whitespace);
+	    Delete(options_whitespace);
+	  }
+	  state = 1;
+	} else if (Equal(decl, kpp_dbeginfile)) {
+          /* Got an internal directive marking the beginning of an included file: %beginfile ... %endoffile */
+          filelevel++;
+          start_line = Getline(s);
+          copy_location(s, chunk);
+          add_chunk(ns, chunk, allow);
+          Append(chunk, decl);
+          state = 120;
+	} else if (Equal(decl, kpp_dline)) {
+	  /* Got a line directive  */
+	  state = 1;
+	} else if (Equal(decl, kpp_ddefine)) {
+	  /* Got a define directive  */
+	  dlevel++;
+	  copy_location(s, chunk);
+	  add_chunk(ns, chunk, allow);
+	  Clear(value);
+	  copy_location(s, value);
+	  state = 150;
+	} else {
+	  Append(chunk, decl);
+	  state = 1;
+	}
+      } else {
+	Putc(c, decl);
+      }
+      break;
+
+      /* Searching for the end of a %beginfile block */
+    case 120:
+      Putc(c, chunk);
+      if (c == '%') {
+        const char *bf = "beginfile";
+        const char *ef = "endoffile";
+        char statement[10];
+        int i = 0;
+        for (i = 0; i < 9;) {
+          c = Getc(s);
+          Putc(c, chunk);
+          statement[i++] = (char)c;
+	  if (strncmp(statement, bf, i) && strncmp(statement, ef, i))
+	    break;
+	}
+	c = Getc(s);
+	Ungetc(c, s);
+        if ((i == 9) && (isspace(c))) {
+	  if (strncmp(statement, bf, i) == 0) {
+	    ++filelevel;
+	  } else if (strncmp(statement, ef, i) == 0) {
+            --filelevel;
+            if (!filelevel) {
+              /* Reached end of included file */
+              addline(ns, chunk, allow);
+              Clear(chunk);
+              copy_location(s, chunk);
+              state = 1;
+            }
+          }
+        }
+      }
+      break;
+
+      /* Searching for the end of a %define statement  */
+    case 150:
+      Putc(c, value);
+      if (c == '%') {
+	const char *ed = "enddef";
+	const char *df = "define";
+	char statement[7];
+	int i = 0;
+	for (i = 0; i < 6;) {
+	  c = Getc(s);
+	  Putc(c, value);
+	  statement[i++] = (char)c;
+	  if (strncmp(statement, ed, i) && strncmp(statement, df, i))
+	    break;
+	}
+	c = Getc(s);
+	Ungetc(c, s);
+	if ((i == 6) && (isspace(c))) {
+	  if (strncmp(statement, df, i) == 0) {
+	    ++dlevel;
+	  } else {
+	    if (strncmp(statement, ed, i) == 0) {
+	      --dlevel;
+	      if (!dlevel) {
+		/* Got the macro  */
+		for (i = 0; i < 7; i++) {
+		  Delitem(value, DOH_END);
+		}
+		if (allow) {
+		  Seek(value, 0, SEEK_SET);
+		  Preprocessor_define(value, 1);
+		}
+		addline(ns, value, 0);
+		state = 0;
+	      }
+	    }
+	  }
+	}
+      }
+      break;
+    default:
+      Printf(stderr, "cpp: Invalid parser state %d\n", state);
+      Exit(EXIT_FAILURE);
+    }
+  }
+  while (level > 0) {
+    Swig_error(Getfile(s), cond_lines[level - 1], "Missing #endif for conditional starting here\n");
+    level--;
+  }
+  if (state == 120) {
+    Swig_error(Getfile(s), start_line, "Missing %%endoffile for file inclusion block starting here\n");
+  }
+  if (state == 150) {
+    Seek(value, 0, SEEK_SET);
+    Swig_error(Getfile(s), Getline(value), "Missing %%enddef for macro starting here\n", Getline(value));
+  }
+  if ((state >= 105) && (state < 107)) {
+    Swig_error(Getfile(s), start_line, "Unterminated %%{ ... %%} block\n");
+  }
+  if ((state >= 30) && (state < 40)) {
+    Swig_error(Getfile(s), start_line, "Unterminated comment\n");
+  }
+
+  copy_location(s, chunk);
+  add_chunk(ns, chunk, allow);
+
+  /*  DelScope(scp); */
+  Delete(decl);
+  Delete(id);
+  Delete(value);
+  Delete(comment);
+  Delete(chunk);
+
+  return ns;
+}