ld/ldlex.l

   1 %{
   2
   3 /* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
   4
   5 This file is part of GLD, the Gnu Linker.
   6
   7 GLD is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GLD is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GLD; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /*
  22 This was written by steve chamberlain
  23                     [email protected]
  24 */
  25
  26
  27 #include <ansidecl.h>
  28 #include <stdio.h>
  29 /* start-sanitize-mpw */
  30 #ifdef MPW
  31 /* Prevent enum redefinition problems. */
  32 #define TRUE_FALSE_ALREADY_DEFINED
  33 #endif /* MPW */
  34 /* end-sanitize-mpw */
  35 #include "bfd.h"
  36 #include "sysdep.h"
  37 #include "ld.h"
  38 #include "ldgram.h"
  39 #include "ldmisc.h"
  40 #include "ldexp.h"
  41 #include "ldlang.h"
  42 #include "ldfile.h"
  43 #include "ldlex.h"
  44 #include "ldmain.h"
  45
  46 /* The type of top-level parser input.
  47    yylex and yyparse (indirectly) both check this.  */
  48 input_type parser_input;
  49
  50 /* Radix to use for bfd_scan_vma -- 0 (default to base 10) or 16.  */
  51 int hex_mode;
  52
  53 /* Line number in the current input file.
  54    (FIXME Actually, it doesn't appear to get reset for each file?)  */
  55 unsigned int lineno = 1;
  56
  57 /* Support for flex reading from more than one input file (stream).
  58    `include_stack' is flex's input state for each open file;
  59    `file_name_stack' is the file names.
  60
  61    If `include_stack_ptr' is 0, we haven't started reading anything yet.
  62    Otherwise, stack elements 0 through `include_stack_ptr - 1' are valid.  */
  63
  64 #undef YY_INPUT
  65 #define YY_INPUT(buf,result,max_size) yy_input(buf, &result, max_size)
  66
  67 #define MAX_INCLUDE_DEPTH 10
  68 static YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
  69 static char *file_name_stack[MAX_INCLUDE_DEPTH];
  70 static unsigned int include_stack_ptr = 0;
  71
  72 static YY_BUFFER_STATE yy_create_string_buffer PARAMS ((const char *string,
  73                                                         size_t size));
  74 static void yy_input PARAMS ((char *, int *result, int max_size));
  75
  76 static void comment PARAMS ((void));
  77 static void lex_warn_invalid PARAMS ((char *where, char *what));
  78
  79 /* STATES
  80         EXPRESSION      definitely in an expression
  81         SCRIPT          definitely in a script
  82         BOTH            either EXPRESSION or SCRIPT
  83         DEFSYMEXP       in an argument to -defsym
  84         MRI             in an MRI script
  85 */
  86 #define RTOKEN(x)  {  yylval.token = x; return x; }
  87
  88 /* Some versions of flex want this.  */
  89 #ifndef yywrap
  90 int yywrap () { return 1; }
  91 #endif
  92 %}
  93
  94 %a 4000
  95 %o 5000
  96
  97 CMDFILENAMECHAR   [_a-zA-Z0-9\/\.\\_\+\$\:\[\]\\\,\=\&\!\<\>\-\~]
  98 CMDFILENAMECHAR1  [_a-zA-Z0-9\/\.\\_\+\$\:\[\]\\\,\=\&\!\<\>\~]
  99 FILENAMECHAR1   [_a-zA-Z\/\.\\\$\_\~]
 100 SYMBOLCHARN     [_a-zA-Z\/\.\\0-9]
 101 FILENAMECHAR    [_a-zA-Z0-9\/\.\-\_\+\=\$\:\[\]\\\,\~]
 102 FILENAME        {FILENAMECHAR}+
 103 WHITE           [ \t\n]+
 104
 105 NOCFILENAMECHAR [_a-zA-Z0-9\/\.\-\_\+\$\:\[\]\\\~]
 106
 107
 108 %s SCRIPT
 109 %s EXPRESSION
 110 %s BOTH
 111 %s DEFSYMEXP
 112 %s MRI
 113 %%
 114
 115   if (parser_input != input_selected)
 116     {
 117       /* The first token of the input determines the initial parser state.  */
 118       input_type t = parser_input;
 119       parser_input = input_selected;
 120       return t;
 121     }
 122
 123 <BOTH,SCRIPT,EXPRESSION>"/*"    { comment(); }
 124
 125
 126 <DEFSYMEXP>"-"                  { RTOKEN('-');}
 127 <DEFSYMEXP>"+"                  { RTOKEN('+');}
 128 <DEFSYMEXP>{FILENAMECHAR1}{SYMBOLCHARN}*   { yylval.name = buystring(yytext); return NAME; }
 129 <DEFSYMEXP>"="                  { RTOKEN('='); }
 130
 131 <MRI,EXPRESSION>"$"([0-9A-Fa-f])+ {
 132                                 yylval.integer = bfd_scan_vma (yytext+1, 0,16);
 133                                 return INT;
 134                         }
 135
 136 <MRI,EXPRESSION>([0-9A-Fa-f])+(H|X|B|O|D) {
 137                                    int ibase ;
 138                                    switch (yytext[yyleng-1]) {
 139                                     case 'X':
 140                                     case 'H':
 141                                      ibase = 16;
 142                                      break;
 143                                     case 'O':
 144                                      ibase = 8;
 145                                      break;
 146                                     case 'B':
 147                                      ibase = 2;
 148                                      break;
 149                                     default:
 150                                      ibase = 10;
 151                                    }
 152                                    yylval.integer = bfd_scan_vma (yytext+1, 0,
 153                                                                   ibase);
 154                                    return INT;
 155                                  }
 156 <SCRIPT,DEFSYMEXP,MRI,BOTH,EXPRESSION>"$"?"0x"?([0-9A-Fa-f])+(M|K|m|k)? {
 157                                   yylval.integer = bfd_scan_vma (yytext, 0,
 158                                                                  hex_mode);
 159                                   if (yytext[yyleng-1]=='M'
 160                                         || yytext[yyleng-1] == 'm') {
 161                                       yylval.integer *= 1024*1024;
 162                                     }
 163                                   if (yytext[yyleng-1]=='K'
 164                                 || yytext[yyleng-1]=='k') {
 165                                       yylval.integer *= 1024;
 166                                     }
 167                                   return INT;
 168                                 }
 169 <BOTH,SCRIPT,EXPRESSION>"]"             { RTOKEN(']');}
 170 <BOTH,SCRIPT,EXPRESSION>"["             { RTOKEN('[');}
 171 <BOTH,SCRIPT,EXPRESSION>"<<="   { RTOKEN(LSHIFTEQ);}
 172 <BOTH,SCRIPT,EXPRESSION>">>="   { RTOKEN(RSHIFTEQ);}
 173 <BOTH,SCRIPT,EXPRESSION>"||"    { RTOKEN(OROR);}
 174 <BOTH,SCRIPT,EXPRESSION>"=="    { RTOKEN(EQ);}
 175 <BOTH,SCRIPT,EXPRESSION>"!="    { RTOKEN(NE);}
 176 <BOTH,SCRIPT,EXPRESSION>">="    { RTOKEN(GE);}
 177 <BOTH,SCRIPT,EXPRESSION>"<="    { RTOKEN(LE);}
 178 <BOTH,SCRIPT,EXPRESSION>"<<"    { RTOKEN(LSHIFT);}
 179 <BOTH,SCRIPT,EXPRESSION>">>"    { RTOKEN(RSHIFT);}
 180 <BOTH,SCRIPT,EXPRESSION>"+="    { RTOKEN(PLUSEQ);}
 181 <BOTH,SCRIPT,EXPRESSION>"-="    { RTOKEN(MINUSEQ);}
 182 <BOTH,SCRIPT,EXPRESSION>"*="    { RTOKEN(MULTEQ);}
 183 <BOTH,SCRIPT,EXPRESSION>"/="    { RTOKEN(DIVEQ);}
 184 <BOTH,SCRIPT,EXPRESSION>"&="    { RTOKEN(ANDEQ);}
 185 <BOTH,SCRIPT,EXPRESSION>"|="    { RTOKEN(OREQ);}
 186 <BOTH,SCRIPT,EXPRESSION>"&&"    { RTOKEN(ANDAND);}
 187 <BOTH,SCRIPT,EXPRESSION>">"             { RTOKEN('>');}
 188 <MRI,BOTH,SCRIPT,EXPRESSION>","         { RTOKEN(',');}
 189 <BOTH,SCRIPT,EXPRESSION>"&"             { RTOKEN('&');}
 190 <BOTH,SCRIPT,EXPRESSION>"|"             { RTOKEN('|');}
 191 <BOTH,SCRIPT,EXPRESSION>"~"             { RTOKEN('~');}
 192 <BOTH,SCRIPT,EXPRESSION>"!"             { RTOKEN('!');}
 193 <BOTH,SCRIPT,EXPRESSION>"?"             { RTOKEN('?');}
 194 <BOTH,SCRIPT,EXPRESSION>"*"             { RTOKEN('*');}
 195 <BOTH,SCRIPT,EXPRESSION>"+"             { RTOKEN('+');}
 196 <BOTH,SCRIPT,EXPRESSION>"-"             { RTOKEN('-');}
 197 <BOTH,SCRIPT,EXPRESSION>"/"             { RTOKEN('/');}
 198 <BOTH,SCRIPT,EXPRESSION>"%"             { RTOKEN('%');}
 199 <BOTH,SCRIPT,EXPRESSION>"<"             { RTOKEN('<');}
 200 <MRI,BOTH,SCRIPT,EXPRESSION>"="          { RTOKEN('=');}
 201 <BOTH,SCRIPT,EXPRESSION>"}"                     { RTOKEN('}') ; }
 202 <BOTH,SCRIPT,EXPRESSION>"{"                     { RTOKEN('{'); }
 203 <BOTH,SCRIPT,EXPRESSION>")"                     { RTOKEN(')');}
 204 <BOTH,SCRIPT,EXPRESSION>"("                     { RTOKEN('(');}
 205 <BOTH,SCRIPT,EXPRESSION>":"             { RTOKEN(':'); }
 206 <BOTH,SCRIPT,EXPRESSION>";"             { RTOKEN(';');}
 207 <BOTH,SCRIPT>"MEMORY"           { RTOKEN(MEMORY);}
 208 <BOTH,SCRIPT>"ORIGIN"           { RTOKEN(ORIGIN);}
 209 <BOTH,SCRIPT>"BLOCK"                    { RTOKEN(BLOCK);}
 210 <BOTH,SCRIPT>"LENGTH"           { RTOKEN(LENGTH);}
 211 <EXPRESSION,BOTH,SCRIPT>"ALIGN"                 { RTOKEN(ALIGN_K);}
 212 <EXPRESSION,BOTH,SCRIPT>"ADDR"                  { RTOKEN(ADDR);}
 213 <BOTH,SCRIPT>"ENTRY"                    { RTOKEN(ENTRY);}
 214 <EXPRESSION,BOTH,SCRIPT>"NEXT"                  { RTOKEN(NEXT);}
 215 <EXPRESSION,BOTH,SCRIPT>"sizeof_headers"        { RTOKEN(SIZEOF_HEADERS);}
 216 <EXPRESSION,BOTH,SCRIPT>"SIZEOF_HEADERS"        { RTOKEN(SIZEOF_HEADERS);}
 217 <BOTH,SCRIPT>"MAP"                      { RTOKEN(MAP);}
 218 <EXPRESSION,BOTH,SCRIPT>"SIZEOF"                { RTOKEN(SIZEOF);}
 219 <BOTH,SCRIPT>"TARGET"           { RTOKEN(TARGET_K);}
 220 <BOTH,SCRIPT>"SEARCH_DIR"               { RTOKEN(SEARCH_DIR);}
 221 <BOTH,SCRIPT>"OUTPUT"           { RTOKEN(OUTPUT);}
 222 <BOTH,SCRIPT>"INPUT"                    { RTOKEN(INPUT);}
 223 <EXPRESSION,BOTH,SCRIPT>"DEFINED"               { RTOKEN(DEFINED);}
 224 <BOTH,SCRIPT>"CREATE_OBJECT_SYMBOLS"    { RTOKEN(CREATE_OBJECT_SYMBOLS);}
 225 <BOTH,SCRIPT>"CONSTRUCTORS"             { RTOKEN( CONSTRUCTORS);}
 226 <BOTH,SCRIPT>"FORCE_COMMON_ALLOCATION" { RTOKEN(FORCE_COMMON_ALLOCATION);}
 227 <BOTH,SCRIPT>"SECTIONS"         { RTOKEN(SECTIONS);}
 228 <BOTH,SCRIPT>"FILL"                     { RTOKEN(FILL);}
 229 <BOTH,SCRIPT>"STARTUP"          { RTOKEN(STARTUP);}
 230 <BOTH,SCRIPT>"OUTPUT_FORMAT"            { RTOKEN(OUTPUT_FORMAT);}
 231 <BOTH,SCRIPT>"OUTPUT_ARCH"              { RTOKEN( OUTPUT_ARCH);}
 232 <BOTH,SCRIPT>"HLL"                      { RTOKEN(HLL);}
 233 <BOTH,SCRIPT>"SYSLIB"           { RTOKEN(SYSLIB);}
 234 <BOTH,SCRIPT>"FLOAT"                    { RTOKEN(FLOAT);}
 235 <BOTH,SCRIPT>"QUAD"                     { RTOKEN( QUAD);}
 236 <BOTH,SCRIPT>"LONG"                     { RTOKEN( LONG);}
 237 <BOTH,SCRIPT>"SHORT"                    { RTOKEN( SHORT);}
 238 <BOTH,SCRIPT>"BYTE"                     { RTOKEN( BYTE);}
 239 <BOTH,SCRIPT>"NOFLOAT"          { RTOKEN(NOFLOAT);}
 240 <EXPRESSION,BOTH,SCRIPT>"NOLOAD"                { RTOKEN(NOLOAD);}
 241 <BOTH,SCRIPT>"DSECT"                    { RTOKEN(DSECT);}
 242 <BOTH,SCRIPT>"COPY"                     { RTOKEN(COPY);}
 243 <BOTH,SCRIPT>"INFO"                     { RTOKEN(INFO);}
 244 <BOTH,SCRIPT>"OVERLAY"          { RTOKEN(OVERLAY);}
 245 <BOTH,SCRIPT>"o"                        { RTOKEN(ORIGIN);}
 246 <BOTH,SCRIPT>"org"                      { RTOKEN(ORIGIN);}
 247 <BOTH,SCRIPT>"l"                        { RTOKEN( LENGTH);}
 248 <BOTH,SCRIPT>"len"                      { RTOKEN( LENGTH);}
 249 <BOTH,SCRIPT>"INCLUDE"                  { RTOKEN(INCLUDE);}
 250 <EXPRESSION,BOTH,SCRIPT>"AT"                    { RTOKEN(AT);}
 251 <MRI>"\n"                       { ++ lineno;  RTOKEN(NEWLINE); }
 252 <MRI>"*".*                      { /* Mri comment line */ }
 253 <MRI>"END"                      { RTOKEN(ENDWORD); }
 254 <MRI>"ALIGNMOD"         { RTOKEN(ALIGNMOD);}
 255 <MRI>"ALIGN"            { RTOKEN(ALIGN_K);}
 256
 257 <MRI>"CHIP"                     { RTOKEN(CHIP); }
 258 <MRI>"BASE"                     { RTOKEN(BASE); }
 259 <MRI>"ALIAS"                     { RTOKEN(ALIAS); }
 260 <MRI>"TRUNCATE"                     { RTOKEN(TRUNCATE); }
 261 <MRI>"LOAD"                     { RTOKEN(LOAD); }
 262 <MRI>"PUBLIC"                   { RTOKEN(PUBLIC); }
 263 <MRI>"ORDER"                    { RTOKEN(ORDER); }
 264 <MRI>"NAME"                     { RTOKEN(NAMEWORD); }
 265 <MRI>"FORMAT"                   { RTOKEN(FORMAT); }
 266 <MRI>"LIST".*                   { RTOKEN(LIST); /* LIST and ignore to end of line */ }
 267 <MRI>"SECT"                     { RTOKEN(SECT); }
 268 <EXPRESSION,BOTH,SCRIPT,MRI>"ABSOLUTE"                  { RTOKEN(ABSOLUTE); }
 269 <MRI>"end"                      { RTOKEN(ENDWORD); }
 270 <MRI>"chip"                     { RTOKEN(CHIP); }
 271 <MRI>"load"                     { RTOKEN(LOAD); }
 272 <MRI>"order"                    { RTOKEN(ORDER); }
 273 <MRI>"name"                     { RTOKEN(NAMEWORD); }
 274 <MRI>"format"                   { RTOKEN(FORMAT); }
 275 <MRI>"list".*                   { RTOKEN(LIST); /* LIST and ignore to end of line */ }
 276 <MRI>"sect"                     { RTOKEN(SECT); }
 277 <EXPRESSION,BOTH,SCRIPT,MRI>"absolute"                  { RTOKEN(ABSOLUTE); }
 278
 279 <MRI>{FILENAMECHAR1}{NOCFILENAMECHAR}*  {
 280 /* Filename without commas, needed to parse mri stuff */
 281                                  yylval.name = buystring(yytext);
 282                                   return NAME;
 283                                 }
 284
 285
 286 <BOTH,EXPRESSION>{FILENAMECHAR1}{FILENAMECHAR}* {
 287                                  yylval.name = buystring(yytext);
 288                                   return NAME;
 289                                 }
 290 <SCRIPT>{FILENAMECHAR}* { yylval.name = buystring(yytext);
 291                                   return NAME;
 292                                 }
 293
 294 <EXPRESSION,BOTH,SCRIPT>"\""[^\"]*"\"" {
 295                                         /* No matter the state, quotes
 296                                            give what's inside */
 297                                         yylval.name = buystring(yytext+1);
 298                                         yylval.name[yyleng-2] = 0;
 299                                         return NAME;
 300                                 }
 301 <BOTH,SCRIPT,EXPRESSION>"\n"            { lineno++;}
 302 <MRI,BOTH,SCRIPT,EXPRESSION>[ \t]
 303
 304 <<EOF>> {
 305   include_stack_ptr--;
 306
 307   if (include_stack_ptr == 0)
 308   {
 309     yyterminate();
 310   }
 311   else
 312   {
 313     yy_switch_to_buffer(include_stack[include_stack_ptr]);
 314
 315   }
 316   BEGIN(SCRIPT);
 317   ldfile_input_filename = file_name_stack[include_stack_ptr-1];
 318
 319   return END;
 320 }
 321
 322 <SCRIPT,MRI>.           lex_warn_invalid(" in script", yytext);
 323 <EXPRESSION,DEFSYMEXP,BOTH>.    lex_warn_invalid(" in expression", yytext);
 324
 325 %%
 326 \f
 327
 328 /* Switch flex to reading script file NAME, open on FILE,
 329    saving the current input info on the include stack.  */
 330
 331 void
 332 lex_push_file (file, name)
 333      FILE *file;
 334      char *name;
 335 {
 336   if (include_stack_ptr >= MAX_INCLUDE_DEPTH)
 337     {
 338       einfo("%F:includes nested too deeply\n");
 339     }
 340   file_name_stack[include_stack_ptr] = name;
 341   include_stack[include_stack_ptr] = YY_CURRENT_BUFFER;
 342
 343   include_stack_ptr++;
 344   yyin = file;
 345   yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
 346   BEGIN (SCRIPT);
 347 }
 348
 349 /* Return a newly created flex input buffer containing STRING,
 350    which is SIZE bytes long.  */
 351
 352 static YY_BUFFER_STATE
 353 yy_create_string_buffer (string, size)
 354      CONST char *string;
 355      size_t size;
 356 {
 357   YY_BUFFER_STATE b;
 358
 359   /* Calls to m-alloc get turned by sed into xm-alloc.  */
 360   b = (YY_BUFFER_STATE) malloc (sizeof (struct yy_buffer_state));
 361   b->yy_input_file = 0;
 362   b->yy_buf_size = size;
 363
 364   /* yy_ch_buf has to be 2 characters longer than the size given because
 365      we need to put in 2 end-of-buffer characters.  */
 366   b->yy_ch_buf = (YY_CHAR *) malloc ((unsigned) (b->yy_buf_size + 3));
 367
 368   b->yy_ch_buf[0] = '\n';
 369   strcpy (b->yy_ch_buf+1, string);
 370   b->yy_ch_buf[size+1] = YY_END_OF_BUFFER_CHAR;
 371   b->yy_ch_buf[size+2] = YY_END_OF_BUFFER_CHAR;
 372   b->yy_n_chars = size+1;
 373   b->yy_buf_pos = &b->yy_ch_buf[1];
 374   b->yy_eof_status = EOF_NOT_SEEN;
 375
 376   return b;
 377 }
 378
 379 /* Switch flex to reading from STRING, saving the current input info
 380    on the include stack.  */
 381
 382 void
 383 lex_redirect (string)
 384      CONST char *string;
 385 {
 386   YY_BUFFER_STATE tmp;
 387
 388   yy_init = 0;
 389   if (include_stack_ptr >= MAX_INCLUDE_DEPTH)
 390     {
 391       einfo("%F: macros nested too deeply\n");
 392     }
 393   file_name_stack[include_stack_ptr] = "redirect";
 394   include_stack[include_stack_ptr] = YY_CURRENT_BUFFER;
 395   include_stack_ptr++;
 396   tmp = yy_create_string_buffer (string, strlen (string));
 397   yy_switch_to_buffer (tmp);
 398   BEGIN (SCRIPT);
 399 }
 400 \f
 401 /* Functions to switch to a different flex start condition,
 402    saving the current start condition on `state_stack'.  */
 403
 404 static int state_stack[MAX_INCLUDE_DEPTH * 2];
 405 static int *state_stack_p = state_stack;
 406
 407 void
 408 ldlex_script ()
 409 {
 410   *(state_stack_p)++ = yy_start;
 411   BEGIN (SCRIPT);
 412 }
 413
 414 void
 415 ldlex_mri_script ()
 416 {
 417   *(state_stack_p)++ = yy_start;
 418   BEGIN (MRI);
 419 }
 420
 421 void
 422 ldlex_defsym ()
 423 {
 424   *(state_stack_p)++ = yy_start;
 425   BEGIN (DEFSYMEXP);
 426 }
 427
 428 void
 429 ldlex_expression ()
 430 {
 431   *(state_stack_p)++ = yy_start;
 432   BEGIN (EXPRESSION);
 433 }
 434
 435 void
 436 ldlex_both ()
 437 {
 438   *(state_stack_p)++ = yy_start;
 439   BEGIN (BOTH);
 440 }
 441
 442 void
 443 ldlex_popstate ()
 444 {
 445   yy_start = *(--state_stack_p);
 446 }
 447 \f
 448
 449 /* Place up to MAX_SIZE characters in BUF and return in *RESULT
 450    either the number of characters read, or 0 to indicate EOF.  */
 451
 452 static void
 453 yy_input (buf, result, max_size)
 454      char *buf;
 455      int *result;
 456      int max_size;
 457 {
 458   *result = 0;
 459   if (yy_current_buffer->yy_input_file)
 460     {
 461       if (yyin)
 462         {
 463           *result = read (fileno (yyin), (char *) buf, max_size);
 464           if (*result < 0)
 465             einfo ("%F%P: read in flex scanner failed");
 466         }
 467     }
 468 }
 469
 470 /* Eat the rest of a C-style comment.  */
 471
 472 static void
 473 comment ()
 474 {
 475   int c;
 476
 477   while (1)
 478   {
 479     c = input();
 480     while (c != '*' && c != EOF)
 481     {
 482       if (c == '\n')
 483         lineno++;
 484       c = input();
 485     }
 486
 487     if (c == '*')
 488     {
 489       c = input();
 490       while (c == '*')
 491        c = input();
 492       if (c == '/')
 493        break;                   /* found the end */
 494     }
 495
 496     if (c == '\n')
 497       lineno++;
 498
 499     if (c == EOF)
 500     {
 501       einfo( "%F%P: EOF in comment\n");
 502       break;
 503     }
 504   }
 505 }
 506
 507 /* Warn the user about a garbage character WHAT in the input
 508    in context WHERE.  */
 509
 510 static void
 511 lex_warn_invalid (where, what)
 512      char *where, *what;
 513 {
 514   fprintf(stderr,
 515           "%s: ignoring invalid character `%s'%s\n",
 516           program_name, what, where);
 517 }