* data/bison.c++: Merge the two generated headers. Insert a copyright

[bison.git] / src / lex.c

diff --git a/src/lex.c b/src/lex.c
index e2a94ad7f8292f47c725c65721cc0cef8220fa47..489fdf9c3b62cdec7b11f41f46c441f85f6d06ff 100644 (file)
--- a/src/lex.c
+++ b/src/lex.c
@@ -1,5 +1,5 @@
 /* Token-reader for Bison's input parser,
 /* Token-reader for Bison's input parser,

-   Copyright (C) 1984, 1986, 1989, 1992, 2000 Free Software Foundation, Inc.
+   Copyright 1984, 1986, 1989, 1992, 2000, 2001 Free Software Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 


@@ -21,45 +21,37 @@
 #include "system.h"
 #include "getargs.h"
 #include "files.h"
 #include "system.h"
 #include "getargs.h"
 #include "files.h"

-#include "getopt.h"            /* for optarg */

 #include "symtab.h"
 #include "symtab.h"

+#include "options.h"

 #include "lex.h"
 #include "lex.h"

-#include "alloc.h"

 #include "complain.h"
 #include "gram.h"
 #include "complain.h"
 #include "gram.h"

-
-/* functions from main.c */
-extern char *printable_version PARAMS ((int));
+#include "quote.h"

 
 /* Buffer for storing the current token.  */
 
 /* Buffer for storing the current token.  */

-char *token_buffer;
-
-/* Allocated size of token_buffer, not including space for terminator.  */
-int maxtoken;
+static struct obstack token_obstack;
+const char *token_buffer = NULL;

 
 

-bucket *symval;
+bucket *symval = NULL;

 int numval;
 
 int numval;
 

-static int unlexed;            /* these two describe a token to be reread */
-static bucket *unlexed_symval; /* by the next call to lex */
-
+/* A token to be reread, see unlex and lex. */
+static token_t unlexed = tok_undef;
+static bucket *unlexed_symval = NULL;
+static const char *unlexed_token_buffer = NULL;

 
 void
 
 void

-init_lex (void)
+lex_init (void)

 {
 {

-  maxtoken = 100;
-  token_buffer = NEW2 (maxtoken + 1, char);
-  unlexed = -1;
+  obstack_init (&token_obstack);
+  unlexed = tok_undef;

 }
 
 
 }
 
 

-char *
-grow_token_buffer (char *p)
+void
+lex_free (void)

 {
 {

-  int offset = p - token_buffer;
-  maxtoken *= 2;
-  token_buffer = (char *) xrealloc (token_buffer, maxtoken + 1);
-  return token_buffer + offset;
+  obstack_free (&token_obstack, NULL);

 }
 
 
 }
 
 


@@ -78,6 +70,7 @@ skip_white_space (void)
       switch (c)
        {
        case '/':
       switch (c)
        {
        case '/':

+         /* FIXME: Should probably be merged with copy_comment.  */

          c = getc (finput);
          if (c != '*' && c != '/')
            {
          c = getc (finput);
          if (c != '*' && c != '/')
            {


@@ -132,8 +125,12 @@ skip_white_space (void)
     }
 }
 
     }
 }
 

-/* do a getc, but give error message if EOF encountered */
-static int
+
+/*-----------------------------------------------------.
+| Do a getc, but give error message if EOF encountered |
+`-----------------------------------------------------*/
+
+int

 xgetc (FILE *f)
 {
   int c = getc (f);
 xgetc (FILE *f)
 {
   int c = getc (f);


@@ -143,69 +140,62 @@ xgetc (FILE *f)
 }
 
 
 }
 
 

-/*------------------------------------------------------------------.
-| Read one literal character from finput.  Process \ escapes.       |
-| Append the normalized string version of the char to *PP.  Assign  |
-| the character code to *PCODE. Return 1 unless the character is an |
-| unescaped `term' or \n report error for \n                        |
-`------------------------------------------------------------------*/
+/*---------------------------------------------------------------.
+| Read one literal character from FINPUT, process \-escapes, and |
+| return the character.                                          |
+`---------------------------------------------------------------*/

 
 

-static int
-literalchar (char **pp, int *pcode, char term)
+char
+literalchar (void)

 {
   int c;
 {
   int c;

-  char *p;
-  int code;
-  int wasquote = 0;
+  int res;

 
   c = xgetc (finput);
   if (c == '\n')
     {
       complain (_("unescaped newline in constant"));
       ungetc (c, finput);
 
   c = xgetc (finput);
   if (c == '\n')
     {
       complain (_("unescaped newline in constant"));
       ungetc (c, finput);

-      code = '?';
-      wasquote = 1;
+      res = '?';

     }
   else if (c != '\\')
     {
     }
   else if (c != '\\')
     {

-      code = c;
-      if (c == term)
-       wasquote = 1;
+      res = c;

     }
   else
     {
       c = xgetc (finput);
       if (c == 't')
     }
   else
     {
       c = xgetc (finput);
       if (c == 't')

-       code = '\t';
+       res = '\t';

       else if (c == 'n')
       else if (c == 'n')

-       code = '\n';
+       res = '\n';

       else if (c == 'a')
       else if (c == 'a')

-       code = '\007';
+       res = '\007';

       else if (c == 'r')
       else if (c == 'r')

-       code = '\r';
+       res = '\r';

       else if (c == 'f')
       else if (c == 'f')

-       code = '\f';
+       res = '\f';

       else if (c == 'b')
       else if (c == 'b')

-       code = '\b';
+       res = '\b';

       else if (c == 'v')
       else if (c == 'v')

-       code = '\013';
+       res = '\013';

       else if (c == '\\')
       else if (c == '\\')

-       code = '\\';
+       res = '\\';

       else if (c == '\'')
       else if (c == '\'')

-       code = '\'';
+       res = '\'';

       else if (c == '\"')
       else if (c == '\"')

-       code = '\"';
+       res = '\"';

       else if (c <= '7' && c >= '0')
        {
       else if (c <= '7' && c >= '0')
        {

-         code = 0;
+         res = 0;

          while (c <= '7' && c >= '0')
            {
          while (c <= '7' && c >= '0')
            {

-             code = (code * 8) + (c - '0');
-             if (code >= 256 || code < 0)
+             res = (res * 8) + (c - '0');
+             if (res >= 256 || res < 0)

                {
                  complain (_("octal value outside range 0...255: `\\%o'"),
                {
                  complain (_("octal value outside range 0...255: `\\%o'"),

-                           code);
-                 code &= 0xFF;
+                           res);
+                 res &= 0xFF;

                  break;
                }
              c = xgetc (finput);
                  break;
                }
              c = xgetc (finput);


@@ -215,21 +205,21 @@ literalchar (char **pp, int *pcode, char term)
       else if (c == 'x')
        {
          c = xgetc (finput);
       else if (c == 'x')
        {
          c = xgetc (finput);

-         code = 0;
+         res = 0;

          while (1)
            {
              if (c >= '0' && c <= '9')
          while (1)
            {
              if (c >= '0' && c <= '9')

-               code *= 16, code += c - '0';
+               res *= 16, res += c - '0';

              else if (c >= 'a' && c <= 'f')
              else if (c >= 'a' && c <= 'f')

-               code *= 16, code += c - 'a' + 10;
+               res *= 16, res += c - 'a' + 10;

              else if (c >= 'A' && c <= 'F')
              else if (c >= 'A' && c <= 'F')

-               code *= 16, code += c - 'A' + 10;
+               res *= 16, res += c - 'A' + 10;

              else
                break;
              else
                break;

-             if (code >= 256 || code < 0)
+             if (res >= 256 || res < 0)

                {
                {

-                 complain (_("hexadecimal value above 255: `\\x%x'"), code);
-                 code &= 0xFF;
+                 complain (_("hexadecimal value above 255: `\\x%x'"), res);
+                 res &= 0xFF;

                  break;
                }
              c = xgetc (finput);
                  break;
                }
              c = xgetc (finput);


@@ -238,110 +228,79 @@ literalchar (char **pp, int *pcode, char term)
        }
       else
        {
        }
       else
        {

+         char badchar [] = "c";
+         badchar[0] = c;

          complain (_("unknown escape sequence: `\\' followed by `%s'"),
          complain (_("unknown escape sequence: `\\' followed by `%s'"),

-                   printable_version (c));
-         code = '?';
+                   quote (badchar));
+         res = '?';

        }
     }                          /* has \ */
 
        }
     }                          /* has \ */
 

-  /* now fill token_buffer with the canonical name for this character
-     as a literal token.  Do not use what the user typed,
-     so that `\012' and `\n' can be interchangeable.  */
-
-  p = *pp;
-  if (code == term && wasquote)
-    *p++ = code;
-  else if (code == '\\')
-    {
-      *p++ = '\\';
-      *p++ = '\\';
-    }
-  else if (code == '\'')
-    {
-      *p++ = '\\';
-      *p++ = '\'';
-    }
-  else if (code == '\"')
-    {
-      *p++ = '\\';
-      *p++ = '\"';
-    }
-  else if (code >= 040 && code < 0177)
-    *p++ = code;
-  else if (code == '\t')
-    {
-      *p++ = '\\';
-      *p++ = 't';
-    }
-  else if (code == '\n')
-    {
-      *p++ = '\\';
-      *p++ = 'n';
-    }
-  else if (code == '\r')
-    {
-      *p++ = '\\';
-      *p++ = 'r';
-    }
-  else if (code == '\v')
-    {
-      *p++ = '\\';
-      *p++ = 'v';
-    }
-  else if (code == '\b')
-    {
-      *p++ = '\\';
-      *p++ = 'b';
-    }
-  else if (code == '\f')
-    {
-      *p++ = '\\';
-      *p++ = 'f';
-    }
-  else
-    {
-      *p++ = '\\';
-      *p++ = code / 0100 + '0';
-      *p++ = ((code / 010) & 07) + '0';
-      *p++ = (code & 07) + '0';
-    }
-  *pp = p;
-  *pcode = code;
-  return !wasquote;
+  return res;

 }
 
 
 void
 }
 
 
 void

-unlex (int token)
+unlex (token_t token)

 {
   unlexed = token;
 {
   unlexed = token;

+  unlexed_token_buffer = token_buffer;

   unlexed_symval = symval;
 }
 
   unlexed_symval = symval;
 }
 

+/*-----------------------------------------------------------------.
+| We just read `<' from FIN.  Store in TOKEN_BUFFER, the type name |
+| specified between the `<...>'.                                   |
+`-----------------------------------------------------------------*/

 
 

-int
+void
+read_type_name (FILE *fin)
+{
+  int c = getc (fin);
+
+  while (c != '>')
+    {
+      if (c == EOF)
+       fatal (_("unterminated type name at end of file"));
+      if (c == '\n')
+       {
+         complain (_("unterminated type name"));
+         ungetc (c, fin);
+         break;
+       }
+
+      obstack_1grow (&token_obstack, c);
+      c = getc (fin);
+    }
+  obstack_1grow (&token_obstack, '\0');
+  token_buffer = obstack_finish (&token_obstack);
+}
+
+
+token_t

 lex (void)
 {
   int c;
 lex (void)
 {
   int c;

-  char *p;

 
 

-  if (unlexed >= 0)
+  /* Just to make sure. */
+  token_buffer = NULL;
+
+  if (unlexed != tok_undef)

     {
     {

+      token_t res = unlexed;

       symval = unlexed_symval;
       symval = unlexed_symval;

-      c = unlexed;
-      unlexed = -1;
-      return c;
+      token_buffer = unlexed_token_buffer;
+      unlexed = tok_undef;
+      return res;

     }
 
   c = skip_white_space ();
     }
 
   c = skip_white_space ();

-  *token_buffer = c;           /* for error messages (token buffer always valid) */
-  token_buffer[1] = 0;

 
   switch (c)
     {
     case EOF:
 
   switch (c)
     {
     case EOF:

-      strcpy (token_buffer, "EOF");
-      return ENDFILE;
+      token_buffer = "EOF";
+      return tok_eof;

 
     case 'A':    case 'B':    case 'C':    case 'D':    case 'E':
     case 'F':    case 'G':    case 'H':    case 'I':    case 'J':
 
     case 'A':    case 'B':    case 'C':    case 'D':    case 'E':
     case 'F':    case 'G':    case 'H':    case 'I':    case 'J':


@@ -357,285 +316,293 @@ lex (void)
     case 'z':
     case '.':    case '_':
 
     case 'z':
     case '.':    case '_':
 

-      p = token_buffer;

       while (isalnum (c) || c == '_' || c == '.')
        {
       while (isalnum (c) || c == '_' || c == '.')
        {

-         if (p == token_buffer + maxtoken)
-           p = grow_token_buffer (p);
-
-         *p++ = c;
+         obstack_1grow (&token_obstack, c);

          c = getc (finput);
        }
          c = getc (finput);
        }

-
-      *p = 0;
+      obstack_1grow (&token_obstack, '\0');
+      token_buffer = obstack_finish (&token_obstack);

       ungetc (c, finput);
       symval = getsym (token_buffer);
       ungetc (c, finput);
       symval = getsym (token_buffer);

-      return IDENTIFIER;
+      return tok_identifier;

 
     case '0':    case '1':    case '2':    case '3':    case '4':
     case '5':    case '6':    case '7':    case '8':    case '9':
       {
        numval = 0;
 
 
     case '0':    case '1':    case '2':    case '3':    case '4':
     case '5':    case '6':    case '7':    case '8':    case '9':
       {
        numval = 0;
 

-       p = token_buffer;

        while (isdigit (c))
          {
        while (isdigit (c))
          {

-           if (p == token_buffer + maxtoken)
-             p = grow_token_buffer (p);
-
-           *p++ = c;
+           obstack_1grow (&token_obstack, c);

            numval = numval * 10 + c - '0';
            c = getc (finput);
          }
            numval = numval * 10 + c - '0';
            c = getc (finput);
          }

-       *p = 0;
+       obstack_1grow (&token_obstack, '\0');
+       token_buffer = obstack_finish (&token_obstack);

        ungetc (c, finput);
        ungetc (c, finput);

-       return NUMBER;
+       return tok_number;

       }
 
     case '\'':
       /* parse the literal token and compute character code in  code  */
 
       }
 
     case '\'':
       /* parse the literal token and compute character code in  code  */
 

-      translations = -1;

       {
       {

-       int code, discode;
-       char discard[10], *dp;
+       int code = literalchar ();

 
 

-       p = token_buffer;
-       *p++ = '\'';
-       literalchar (&p, &code, '\'');
+       obstack_1grow (&token_obstack, '\'');
+       obstack_1grow (&token_obstack, code);

 
        c = getc (finput);
        if (c != '\'')
          {
            complain (_("use \"...\" for multi-character literal tokens"));
 
        c = getc (finput);
        if (c != '\'')
          {
            complain (_("use \"...\" for multi-character literal tokens"));

-           while (1)
-             {
-               dp = discard;
-               if (!literalchar (&dp, &discode, '\''))
-                 break;
-             }
+           while (literalchar () != '\'')
+             /* Skip. */;

          }
          }

-       *p++ = '\'';
-       *p = 0;
+       obstack_1grow (&token_obstack, '\'');
+       obstack_1grow (&token_obstack, '\0');
+       token_buffer = obstack_finish (&token_obstack);

        symval = getsym (token_buffer);
        symval = getsym (token_buffer);

-       symval->class = STOKEN;
-       if (!symval->user_token_number)
+       symval->class = token_sym;
+       if (symval->user_token_number == SUNDEF)

          symval->user_token_number = code;
          symval->user_token_number = code;

-       return IDENTIFIER;
+       return tok_identifier;

       }
 
     case '\"':
       /* parse the literal string token and treat as an identifier */
 
       }
 
     case '\"':
       /* parse the literal string token and treat as an identifier */
 

-      translations = -1;

       {
        int code;               /* ignored here */
       {
        int code;               /* ignored here */

-       p = token_buffer;
-       *p++ = '\"';
-       while (literalchar (&p, &code, '\"'))   /* read up to and including " */
+
+       obstack_1grow (&token_obstack, '\"');
+       /* Read up to and including ".  */
+       do

          {
          {

-           if (p >= token_buffer + maxtoken - 4)
-             p = grow_token_buffer (p);
+           code = literalchar ();
+           obstack_1grow (&token_obstack, code);

          }
          }

-       *p = 0;
+       while (code != '\"');
+       obstack_1grow (&token_obstack, '\0');
+       token_buffer = obstack_finish (&token_obstack);

 
        symval = getsym (token_buffer);
 
        symval = getsym (token_buffer);

-       symval->class = STOKEN;
+       symval->class = token_sym;

 
 

-       return IDENTIFIER;
+       return tok_identifier;

       }
 
     case ',':
       }
 
     case ',':

-      return COMMA;
+      token_buffer = ",";
+      return tok_comma;

 
     case ':':
 
     case ':':

-      return COLON;
+      token_buffer = ":";
+      return tok_colon;

 
     case ';':
 
     case ';':

-      return SEMICOLON;
+      token_buffer = ";";
+      return tok_semicolon;

 
     case '|':
 
     case '|':

-      return BAR;
+      token_buffer = "|";
+      return tok_bar;

 
     case '{':
 
     case '{':

-      return LEFT_CURLY;
+      token_buffer = "{";
+      return tok_left_curly;

 
     case '=':
 
     case '=':

+      obstack_1grow (&token_obstack, c);

       do
        {
          c = getc (finput);
       do
        {
          c = getc (finput);

+         obstack_1grow (&token_obstack, c);

          if (c == '\n')
            lineno++;
        }
       while (c == ' ' || c == '\n' || c == '\t');
          if (c == '\n')
            lineno++;
        }
       while (c == ' ' || c == '\n' || c == '\t');

+      obstack_1grow (&token_obstack, '\0');
+      token_buffer = obstack_finish (&token_obstack);

 
       if (c == '{')
        {
 
       if (c == '{')
        {

-         strcpy (token_buffer, "={");
-         return LEFT_CURLY;
+         return tok_left_curly;

        }
       else
        {
          ungetc (c, finput);
        }
       else
        {
          ungetc (c, finput);

-         return ILLEGAL;
+         return tok_illegal;

        }
 
     case '<':
        }
 
     case '<':

-      p = token_buffer;
-      c = getc (finput);
-      while (c != '>')
-       {
-         if (c == EOF)
-           fatal (_("unterminated type name at end of file"));
-         if (c == '\n')
-           {
-             complain (_("unterminated type name"));
-             ungetc (c, finput);
-             break;
-           }
-
-         if (p == token_buffer + maxtoken)
-           p = grow_token_buffer (p);
-
-         *p++ = c;
-         c = getc (finput);
-       }
-      *p = 0;
-      return TYPENAME;
-
+      read_type_name (finput);
+      return tok_typename;

 
     case '%':
       return parse_percent_token ();
 
     default:
 
     case '%':
       return parse_percent_token ();
 
     default:

-      return ILLEGAL;
+      obstack_1grow (&token_obstack, c);
+      obstack_1grow (&token_obstack, '\0');
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_illegal;

     }
 }
 
     }
 }
 

-/* the following table dictates the action taken for the various %
-   directives.  A setflag value causes the named flag to be set.  A
-   retval action returns the code.  */
-struct percent_table_struct
+/* This function is a strcmp, which doesn't differentiate `-' and `_'
+   chars.  */
+
+static int
+option_strcmp (const char *left, const char *right)

 {
 {

-  const char *name;
-  void *setflag;
-  int retval;
+  const unsigned char *l, *r;
+  int c;
+
+  assert (left);
+  assert (right);
+  l = (const unsigned char *)left;
+  r = (const unsigned char *)right;
+  while (((c = *l - *r++) == 0 && *l != '\0')
+        || ((*l == '-' || *l == '_') && (*r == '_' || *r == '-')))
+    l++;
+  return c;

 }
 }

-percent_table[] =
-{
-  { "token", NULL, TOKEN },
-  { "term", NULL, TOKEN },
-  { "nterm", NULL, NTERM },
-  { "type", NULL, TYPE },
-  { "guard", NULL, GUARD },
-  { "union", NULL, UNION },
-  { "expect", NULL, EXPECT },
-  { "thong", NULL, THONG },
-  { "start", NULL, START },
-  { "left", NULL, LEFT },
-  { "right", NULL, RIGHT },
-  { "nonassoc", NULL, NONASSOC },
-  { "binary", NULL, NONASSOC },
-  { "semantic_parser", NULL, SEMANTIC_PARSER },
-  { "pure_parser", NULL, PURE_PARSER },
-  { "prec", NULL, PREC },
-  { "no_lines", &nolinesflag, NOOP},   /* -l */
-  { "raw", &rawtoknumflag, NOOP },     /* -r */
-  { "token_table", &toknumflag, NOOP}, /* -k */
-#if 0
-    /* These can be utilized after main is reoganized so
-       open_files() is deferred 'til after read_declarations().
-       But %{ and %union both put information into files
-       that have to be opened before read_declarations().
-     */
-  { "yacc", &fixed_outfiles, NOOP},                    /* -y */
-  { "fixed_output_files", &fixed_outfiles, NOOP},      /* -y */
-  { "defines", &definesflag, NOOP},                    /* -d */
-  { "no_parser", &noparserflag, NOOP},                 /* -n */
-  { "output_file", &spec_outfile, SETOPT},             /* -o */
-  { "file_prefix", &spec_file_prefix, SETOPT},         /* -b */
-  { "name_prefix", &spec_name_prefix, SETOPT},         /* -p */
-    /* These would be acceptable, but they do not affect processing */
-  { "verbose", &verboseflag, NOOP},                    /* -v */
-  { "debug", &debugflag, NOOP},                                /* -t */
-/*    {"help", <print usage stmt>, NOOP}, *//* -h */
-/*    {"version", <print version number> ,  NOOP}, *//* -V */
-#endif
-  { NULL, NULL, ILLEGAL}
-};

 
 /* Parse a token which starts with %.
    Assumes the % has already been read and discarded.  */
 
 
 /* Parse a token which starts with %.
    Assumes the % has already been read and discarded.  */
 

-int
+token_t

 parse_percent_token (void)
 {
 parse_percent_token (void)
 {

-  int c;
-  char *p;
-  struct percent_table_struct *tx;
+  const struct option_table_struct *tx = NULL;
+  const char *arg = NULL;
+  /* Where the ARG was found in token_buffer. */
+  size_t arg_offset = 0;

 
 

-  p = token_buffer;
-  c = getc (finput);
-  *p++ = '%';
-  *p++ = c;                    /* for error msg */
-  *p = 0;
+  int c = getc (finput);
+  obstack_1grow (&token_obstack, '%');
+  obstack_1grow (&token_obstack, c);

 
   switch (c)
     {
     case '%':
 
   switch (c)
     {
     case '%':

-      return TWO_PERCENTS;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_two_percents;

 
     case '{':
 
     case '{':

-      return PERCENT_LEFT_CURLY;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_percent_left_curly;

 
 

+      /* The following guys are here for backward compatibility with
+        very ancient Yacc versions.  The paper of Johnson mentions
+        them (as ancient :).  */

     case '<':
     case '<':

-      return LEFT;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_left;

 
     case '>':
 
     case '>':

-      return RIGHT;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_right;

 
     case '2':
 
     case '2':

-      return NONASSOC;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_nonassoc;

 
     case '0':
 
     case '0':

-      return TOKEN;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_token;

 
     case '=':
 
     case '=':

-      return PREC;
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_prec;

     }
     }

+

   if (!isalpha (c))
   if (!isalpha (c))

-    return ILLEGAL;
+    {
+      token_buffer = obstack_finish (&token_obstack);
+      return tok_illegal;
+    }

 
 

-  p = token_buffer;
-  *p++ = '%';
-  while (isalpha (c) || c == '_' || c == '-')
+  while (c = getc (finput), isalpha (c) || c == '_' || c == '-')

     {
     {

-      if (p == token_buffer + maxtoken)
-       p = grow_token_buffer (p);
+      if (c == '_')
+       c = '-';
+      obstack_1grow (&token_obstack, c);
+    }

 
 

-      if (c == '-')
-       c = '_';
-      *p++ = c;
+  /* %DIRECTIVE="ARG".  Separate into
+     TOKEN_BUFFER = `%DIRECTIVE\0ARG\0'.
+     This is a bit hackish, but once we move to a Bison parser,
+     things will be cleaned up.  */
+  if (c == '=')
+    {
+      /* End of the directive.  We skip the `='. */
+      obstack_1grow (&token_obstack, '\0');
+      /* Fetch the ARG if present. */

       c = getc (finput);
       c = getc (finput);

+      if (c == '"')
+       {
+         int code;
+         arg_offset = obstack_object_size (&token_obstack);
+         /* Read up to and including `"'.  Do not append the closing
+            `"' in the output: it's not part of the ARG.  */
+         while ((code = literalchar ()) != '"')
+           obstack_1grow (&token_obstack, code);
+       }
+      /* else: should be an error. */

     }
     }

+  else
+    ungetc (c, finput);

 
 

-  ungetc (c, finput);
-
-  *p = 0;
+  obstack_1grow (&token_obstack, '\0');
+  token_buffer = obstack_finish (&token_obstack);
+  if (arg_offset)
+    arg = token_buffer + arg_offset;

 
   /* table lookup % directive */
 
   /* table lookup % directive */

-  for (tx = percent_table; tx->name; tx++)
-    if (strcmp (token_buffer + 1, tx->name) == 0)
+  for (tx = option_table; tx->name; tx++)
+    if ((tx->access == opt_percent || tx->access == opt_both)
+       && option_strcmp (token_buffer + 1, tx->name) == 0)

       break;
       break;

-  if (tx->retval == SETOPT)
-    {
-      *((char **) (tx->setflag)) = optarg;
-      return NOOP;
-    }
-  if (tx->setflag)
+
+  if (arg && tx->ret_val != tok_stropt)
+    fatal (_("`%s' supports no argument: %s"), token_buffer, quote (arg));
+
+
+  switch (tx->ret_val)

     {
     {

-      *((int *) (tx->setflag)) = 1;
-      return NOOP;
+    case tok_stropt:
+      assert (tx->set_flag);
+      if (arg)
+       {
+         /* Keep only the first assignment: command line options have
+            already been processed, and we want them to have
+            precedence.  Side effect: if this %-option is used
+            several times, only the first is honored.  Bah.  */
+         if (!*((char **) (tx->set_flag)))
+           *((char **) (tx->set_flag)) = xstrdup (arg);
+       }
+      else
+       fatal (_("`%s' requires an argument"), token_buffer);
+      return tok_noop;
+      break;
+
+    case tok_intopt:
+      assert (tx->set_flag);
+      *((int *) (tx->set_flag)) = 1;
+      return tok_noop;
+      break;
+
+    case tok_obsolete:
+      fatal (_("`%s' is no longer supported"), token_buffer);
+      return tok_noop;
+      break;
+
+    default:
+      return tx->ret_val;
+      break;

     }
     }

-  return tx->retval;
+  abort ();

 }
 }