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 /* $Xorg: cppsetup.c,v 1.5 2001/02/09 02:03:16 xorgcvs Exp $ */

 /*

 Copyright (c) 1993, 1994, 1998  The Open Group

 Permission to use, copy, modify, distribute, and sell this software and its

 documentation for any purpose is hereby granted without fee, provided that

 the above copyright notice appear in all copies and that both that

 copyright notice and this permission notice appear in supporting

 documentation.

 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

 OPEN GROUP 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 Open Group 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 Open Group.

 */

 /* $XFree86: xc/config/makedepend/cppsetup.c,v 3.11 2001/12/17 20:52:22 dawes Exp $ */

 #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 defined(pdp11) || defined(vax) || defined(ns16000) || defined(mc68000) || defined(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;

 int

 cppsetup(char *line, struct filepointer *filep, struct inclist *inc)

 {

 	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;

     char *filename;

     const char *line;

 };

 static const char *

 my_if_errors (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->filename;

     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 (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 (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 long

 my_eval_variable (IfParser *ip, const char *var, int len)

 {

     long val;

     struct symtab **s;

     s = lookup_variable (ip, var, len);

     if (!s)

 	return 0;

     do {

 	var = (*s)->s_value;

 	if (!isvarfirstletter(*var) || !strcmp((*s)->s_name, var))

 	    break;

 	s = lookup_variable (ip, var, strlen(var));

     } while (s);

     var = ParseIfExpression(ip, var, &val);

     if (var && *var) debug(4, ("extraneous: '%s'\n", var));

     return val;

 }

 int

 cppsetup(char *filename,

 	 char *line,

 	 struct filepointer *filep,

 	 struct inclist *inc)

 {

     IfParser ip;

     struct _parse_data pd;

     long val = 0;

     pd.filep = filep;

     pd.inc = inc;

     pd.line = line;

     pd.filename = filename;

     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 */