cppsetup.c   [plain text]

/* $XConsortium: cppsetup.c,v 1.13 94/04/17 20:10:32 gildea Exp $ */

/*
 * Copyright (c) 1998-2003 Carnegie Mellon University.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The name "Carnegie Mellon University" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For permission or any other legal
 *    details, please contact  
 *      Office of Technology Transfer
 *      Carnegie Mellon University
 *      5000 Forbes Avenue
 *      Pittsburgh, PA  15213-3890
 *      (412) 268-4387, fax: (412) 268-7395
 *      tech-transfer@andrew.cmu.edu
 *
 * 4. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Computing Services
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */
/*

Copyright (c) 1993, 1994  X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.

*/

#include "def.h"

#ifdef	CPP
/*
 * This file is strictly for the sake of cpy.y and yylex.c (if
 * you indeed have the source for cpp).
 */
#define IB 1
#define SB 2
#define NB 4
#define CB 8
#define QB 16
#define WB 32
#define SALT '#'
#if pdp11 | vax | ns16000 | mc68000 | ibm032
#define COFF 128
#else
#define COFF 0
#endif
/*
 * These variables used by cpy.y and yylex.c
 */
extern char	*outp, *inp, *newp, *pend;
extern char	*ptrtab;
extern char	fastab[];
extern char	slotab[];

/*
 * cppsetup
 */
struct filepointer	*currentfile;
struct inclist		*currentinc;

cppsetup(line, filep, inc)
	register char	*line;
	register struct filepointer	*filep;
	register struct inclist		*inc;
{
	register char *p, savec;
	static boolean setupdone = FALSE;
	boolean	value;

	if (!setupdone) {
		cpp_varsetup();
		setupdone = TRUE;
	}

	currentfile = filep;
	currentinc = inc;
	inp = newp = line;
	for (p=newp; *p; p++)
		;

	/*
	 * put a newline back on the end, and set up pend, etc.
	 */
	*p++ = '\n';
	savec = *p;
	*p = '\0';
	pend = p;

	ptrtab = slotab+COFF;
	*--inp = SALT; 
	outp=inp; 
	value = yyparse();
	*p = savec;
	return(value);
}

struct symtab *lookup(symbol)
	char	*symbol;
{
	static struct symtab    undefined;
	struct symtab   *sp;

	sp = isdefined(symbol, currentinc, NULL);
	if (sp == NULL) {
		sp = &undefined;
		sp->s_value = NULL;
	}
	return (sp);
}

pperror(tag, x0,x1,x2,x3,x4)
	int	tag,x0,x1,x2,x3,x4;
{
	warning("\"%s\", line %d: ", currentinc->i_file, currentfile->f_line);
	warning(x0,x1,x2,x3,x4);
}


yyerror(s)
	register char	*s;
{
	fatalerr("Fatal error: %s\n", s);
}
#else /* not CPP */

#include "ifparser.h"
struct _parse_data {
    struct filepointer *filep;
    struct inclist *inc;
    const char *line;
};

static const char *
_my_if_errors (ip, cp, expecting)
    IfParser *ip;
    const char *cp;
    const char *expecting;
{
    struct _parse_data *pd = (struct _parse_data *) ip->data;
    int lineno = pd->filep->f_line;
    char *filename = pd->inc->i_file;
    char prefix[300];
    int prefixlen;
    int i;

    sprintf (prefix, "\"%s\":%d", filename, lineno);
    prefixlen = strlen(prefix);
    fprintf (stderr, "%s:  %s", prefix, pd->line);
    i = cp - pd->line;
    if (i > 0 && pd->line[i-1] != '\n') {
	putc ('\n', stderr);
    }
    for (i += prefixlen + 3; i > 0; i--) {
	putc (' ', stderr);
    }
    fprintf (stderr, "^--- expecting %s\n", expecting);
    return NULL;
}


#define MAXNAMELEN 256

static struct symtab *
_lookup_variable (ip, var, len)
    IfParser *ip;
    const char *var;
    int len;
{
    char tmpbuf[MAXNAMELEN + 1];
    struct _parse_data *pd = (struct _parse_data *) ip->data;

    if (len > MAXNAMELEN)
	return 0;

    strncpy (tmpbuf, var, len);
    tmpbuf[len] = '\0';
    return isdefined (tmpbuf, pd->inc, NULL);
}


static int
_my_eval_defined (ip, var, len)
    IfParser *ip;
    const char *var;
    int len;
{
    if (_lookup_variable (ip, var, len))
	return 1;
    else
	return 0;
}

#define isvarfirstletter(ccc) (isalpha(ccc) || (ccc) == '_')

static int
_my_eval_variable (ip, var, len)
    IfParser *ip;
    const char *var;
    int len;
{
    struct symtab *s;

    s = _lookup_variable (ip, var, len);
    if (!s)
	return 0;
    do {
	var = s->s_value;
	if (!isvarfirstletter(*var))
	    break;
	s = _lookup_variable (ip, var, strlen(var));
    } while (s);

    return atoi(var);
}


cppsetup(line, filep, inc)
	register char	*line;
	register struct filepointer	*filep;
	register struct inclist		*inc;
{
    IfParser ip;
    struct _parse_data pd;
    int val = 0;

    pd.filep = filep;
    pd.inc = inc;
    pd.line = line;
    ip.funcs.handle_error = _my_if_errors;
    ip.funcs.eval_defined = _my_eval_defined;
    ip.funcs.eval_variable = _my_eval_variable;
    ip.data = (char *) &pd;

    (void) ParseIfExpression (&ip, line, &val);
    if (val)
	return IF;
    else
	return IFFALSE;
}
#endif /* CPP */