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rpc_scan.c

/* @(#)rpc_scan.c 2.1 88/08/01 4.0 RPCSRC */
/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 * 
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 * 
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 * 
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 * 
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 * 
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */
#ifndef lint
/*static char sccsid[] = "from: @(#)rpc_scan.c 1.6 87/06/24 (C) 1987 SMI";*/
static char rcsid[] = "$Id: rpc_scan.c,v 1.2 1998/05/12 03:58:46 riley Exp $";
#endif

/*
 * rpc_scan.c, Scanner for the RPC protocol compiler 
 * Copyright (C) 1987, Sun Microsystems, Inc. 
 */
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#else
#include <string.h>
#endif
#include "rpc_scan.h"
#include "rpc_util.h"

#define startcomment(where) (where[0] == '/' && where[1] == '*')
#define endcomment(where) (where[-1] == '*' && where[0] == '/')

static int pushed = 0;  /* is a token pushed */
static token lasttok;   /* last token, if pushed */

static void unget_token(), findstrconst(), findconst(), findkind(),
      printdirective(), docppline();
static int cppline(), directive();

/*
 * scan expecting 1 given token 
 */
void
scan(expect, tokp)
      tok_kind expect;
      token *tokp;
{
      get_token(tokp);
      if (tokp->kind != expect) {
            expected1(expect);
      }
}

/*
 * scan expecting 2 given tokens 
 */
void
scan2(expect1, expect2, tokp)
      tok_kind expect1;
      tok_kind expect2;
      token *tokp;
{
      get_token(tokp);
      if (tokp->kind != expect1 && tokp->kind != expect2) {
            expected2(expect1, expect2);
      }
}

/*
 * scan expecting 3 given token 
 */
void
scan3(expect1, expect2, expect3, tokp)
      tok_kind expect1;
      tok_kind expect2;
      tok_kind expect3;
      token *tokp;
{
      get_token(tokp);
      if (tokp->kind != expect1 && tokp->kind != expect2
          && tokp->kind != expect3) {
            expected3(expect1, expect2, expect3);
      }
}


/*
 * scan expecting a constant, possibly symbolic 
 */
void
scan_num(tokp)
      token *tokp;
{
      get_token(tokp);
      switch (tokp->kind) {
      case TOK_IDENT:
            break;
      default:
            error("constant or identifier expected");
      }
}


/*
 * Peek at the next token 
 */
void
peek(tokp)
      token *tokp;
{
      get_token(tokp);
      unget_token(tokp);
}


/*
 * Peek at the next token and scan it if it matches what you expect 
 */
int
peekscan(expect, tokp)
      tok_kind expect;
      token *tokp;
{
      peek(tokp);
      if (tokp->kind == expect) {
            get_token(tokp);
            return (1);
      }
      return (0);
}



/*
 * Get the next token, printing out any directive that are encountered. 
 */
void
get_token(tokp)
      token *tokp;
{
      int commenting;

      if (pushed) {
            pushed = 0;
            *tokp = lasttok;
            return;
      }
      commenting = 0;
      for (;;) {
            if (*where == 0) {
                  for (;;) {
                        if (!fgets(curline, MAXLINESIZE, fin)) {
                              tokp->kind = TOK_EOF;
                              *where = 0;
                              return;
                        }
                        linenum++;
                        if (commenting) {
                              break;
                        } else if (cppline(curline)) {
                              docppline(curline, &linenum, 
                                      &infilename);
                        } else if (directive(curline)) {
                              printdirective(curline);
                        } else {
                              break;
                        }
                  }
                  where = curline;
            } else if (isspace(*where)) {
                  while (isspace(*where)) {
                        where++;    /* eat */
                  }
            } else if (commenting) {
                  where++;
                  if (endcomment(where)) {
                        where++;
                        commenting--;
                  }
            } else if (startcomment(where)) {
                  where += 2;
                  commenting++;
            } else {
                  break;
            }
      }

      /*
       * 'where' is not whitespace, comment or directive Must be a token! 
       */
      switch (*where) {
      case ':':
            tokp->kind = TOK_COLON;
            where++;
            break;
      case ';':
            tokp->kind = TOK_SEMICOLON;
            where++;
            break;
      case ',':
            tokp->kind = TOK_COMMA;
            where++;
            break;
      case '=':
            tokp->kind = TOK_EQUAL;
            where++;
            break;
      case '*':
            tokp->kind = TOK_STAR;
            where++;
            break;
      case '[':
            tokp->kind = TOK_LBRACKET;
            where++;
            break;
      case ']':
            tokp->kind = TOK_RBRACKET;
            where++;
            break;
      case '{':
            tokp->kind = TOK_LBRACE;
            where++;
            break;
      case '}':
            tokp->kind = TOK_RBRACE;
            where++;
            break;
      case '(':
            tokp->kind = TOK_LPAREN;
            where++;
            break;
      case ')':
            tokp->kind = TOK_RPAREN;
            where++;
            break;
      case '<':
            tokp->kind = TOK_LANGLE;
            where++;
            break;
      case '>':
            tokp->kind = TOK_RANGLE;
            where++;
            break;

      case '"':
            tokp->kind = TOK_STRCONST;
            findstrconst(&where, &tokp->str);
            break;

      case '-':
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
            tokp->kind = TOK_IDENT;
            findconst(&where, &tokp->str);
            break;


      default:
            if (!(isalpha(*where) || *where == '_')) {
                  char buf[100];
                  char *p;

                  s_print(buf, "illegal character in file: ");
                  p = buf + strlen(buf);
                  if (isprint(*where)) {
                        s_print(p, "%c", *where);
                  } else {
                        s_print(p, "%d", *where);
                  }
                  error(buf);
            }
            findkind(&where, tokp);
            break;
      }
}



static void
unget_token(tokp)
      token *tokp;
{
      lasttok = *tokp;
      pushed = 1;
}


static void
findstrconst(str, val)
      char **str;
      char **val;
{
      char *p;
      int size;

      p = *str;
      do {
            *p++;
      } while (*p && *p != '"');
      if (*p == 0) {
            error("unterminated string constant");
      }
      p++;
      size = p - *str;
      *val = alloc(size + 1);
      (void) strncpy(*val, *str, size);
      (*val)[size] = 0;
      *str = p;
}

static void
findconst(str, val)
      char **str;
      char **val;
{
      char *p;
      int size;

      p = *str;
      if (*p == '0' && *(p + 1) == 'x') {
            p++;
            do {
                  p++;
            } while (isxdigit(*p));
      } else {
            do {
                  p++;
            } while (isdigit(*p));
      }
      size = p - *str;
      *val = alloc(size + 1);
      (void) strncpy(*val, *str, size);
      (*val)[size] = 0;
      *str = p;
}



static token symbols[] = {
                    {TOK_CONST, "const"},
                    {TOK_UNION, "union"},
                    {TOK_SWITCH, "switch"},
                    {TOK_CASE, "case"},
                    {TOK_DEFAULT, "default"},
                    {TOK_STRUCT, "struct"},
                    {TOK_TYPEDEF, "typedef"},
                    {TOK_ENUM, "enum"},
                    {TOK_OPAQUE, "opaque"},
                    {TOK_BOOL, "bool"},
                    {TOK_VOID, "void"},
                    {TOK_CHAR, "char"},
                    {TOK_INT, "int"},
                    {TOK_UNSIGNED, "unsigned"},
                    {TOK_SHORT, "short"},
                    {TOK_LONG, "long"},
                    {TOK_FLOAT, "float"},
                    {TOK_DOUBLE, "double"},
                    {TOK_STRING, "string"},
                    {TOK_PROGRAM, "program"},
                    {TOK_VERSION, "version"},
                    {TOK_EOF, "??????"},
};


static void
findkind(mark, tokp)
      char **mark;
      token *tokp;
{

      int len;
      token *s;
      char *str;

      str = *mark;
      for (s = symbols; s->kind != TOK_EOF; s++) {
            len = strlen(s->str);
            if (strncmp(str, s->str, len) == 0) {
                  if (!isalnum(str[len]) && str[len] != '_') {
                        tokp->kind = s->kind;
                        tokp->str = s->str;
                        *mark = str + len;
                        return;
                  }
            }
      }
      tokp->kind = TOK_IDENT;
      for (len = 0; isalnum(str[len]) || str[len] == '_'; len++);
      tokp->str = alloc(len + 1);
      (void) strncpy(tokp->str, str, len);
      tokp->str[len] = 0;
      *mark = str + len;
}

static int
cppline(line)
      char *line;
{
      return (line == curline && *line == '#');
}

static int
directive(line)
      char *line;
{
      return (line == curline && *line == '%');
}

static void
printdirective(line)
      char *line;
{
      f_print(fout, "%s", line + 1);
}

static void
docppline(line, lineno, fname)
      char *line;
      int *lineno;
      char **fname;
{
      char *file;
      int num;
      char *p;

      if (strncmp (line, "#line", 5) == 0) {
            line += 5;
      }

      line++;
      while (isspace(*line)) {
            line++;
      }
      num = atoi(line);
      while (isdigit(*line)) {
            line++;
      }
      while (isspace(*line)) {
            line++;
      }
      if (*line != '"') {
            error("preprocessor error");
      }
      line++;
      p = file = alloc(strlen(line) + 1);
      while (*line && *line != '"') {
            *p++ = *line++;
      }
      if (*line == 0) {
            error("preprocessor error");
      }
      *p = 0;
      if (*file == 0) {
            *fname = NULL;
      } else {
            *fname = file;
      }
      *lineno = num - 1;
}

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