1410 lines
35 KiB
C
1410 lines
35 KiB
C
/* $NetBSD: cond.c,v 1.60 2009/11/06 19:44:06 dsl Exp $ */
|
||
|
||
/*
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||
* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
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* All rights reserved.
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*
|
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* This code is derived from software contributed to Berkeley by
|
||
* Adam de Boor.
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||
*
|
||
* 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. Neither the name of the University nor the names of its contributors
|
||
* may be used to endorse or promote products derived from this software
|
||
* without specific prior written permission.
|
||
*
|
||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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*/
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/*
|
||
* Copyright (c) 1988, 1989 by Adam de Boor
|
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* Copyright (c) 1989 by Berkeley Softworks
|
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* All rights reserved.
|
||
*
|
||
* This code is derived from software contributed to Berkeley by
|
||
* Adam de Boor.
|
||
*
|
||
* 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. All advertising materials mentioning features or use of this software
|
||
* must display the following acknowledgement:
|
||
* This product includes software developed by the University of
|
||
* California, Berkeley and its contributors.
|
||
* 4. Neither the name of the University nor the names of its contributors
|
||
* may be used to endorse or promote products derived from this software
|
||
* without specific prior written permission.
|
||
*
|
||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
* SUCH DAMAGE.
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*/
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#ifndef MAKE_NATIVE
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static char rcsid[] = "$NetBSD: cond.c,v 1.60 2009/11/06 19:44:06 dsl Exp $";
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#else
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)cond.c 8.2 (Berkeley) 1/2/94";
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#else
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__RCSID("$NetBSD: cond.c,v 1.60 2009/11/06 19:44:06 dsl Exp $");
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#endif
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#endif /* not lint */
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#endif
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/*-
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* cond.c --
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* Functions to handle conditionals in a makefile.
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*
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* Interface:
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* Cond_Eval Evaluate the conditional in the passed line.
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*
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*/
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#include <ctype.h>
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#include <errno.h> /* For strtoul() error checking */
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#include "make.h"
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#include "hash.h"
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#include "dir.h"
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#include "buf.h"
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/*
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* The parsing of conditional expressions is based on this grammar:
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* E -> F || E
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* E -> F
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* F -> T && F
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* F -> T
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* T -> defined(variable)
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* T -> make(target)
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* T -> exists(file)
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* T -> empty(varspec)
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* T -> target(name)
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* T -> commands(name)
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* T -> symbol
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* T -> $(varspec) op value
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* T -> $(varspec) == "string"
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* T -> $(varspec) != "string"
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* T -> "string"
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* T -> ( E )
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* T -> ! T
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* op -> == | != | > | < | >= | <=
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*
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* 'symbol' is some other symbol to which the default function (condDefProc)
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* is applied.
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*
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* Tokens are scanned from the 'condExpr' string. The scanner (CondToken)
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* will return TOK_AND for '&' and '&&', TOK_OR for '|' and '||',
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* TOK_NOT for '!', TOK_LPAREN for '(', TOK_RPAREN for ')' and will evaluate
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* the other terminal symbols, using either the default function or the
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||
* function given in the terminal, and return the result as either TOK_TRUE
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* or TOK_FALSE.
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*
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* TOK_FALSE is 0 and TOK_TRUE 1 so we can directly assign C comparisons.
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*
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* All Non-Terminal functions (CondE, CondF and CondT) return TOK_ERROR on
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* error.
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||
*/
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typedef enum {
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TOK_FALSE = 0, TOK_TRUE = 1, TOK_AND, TOK_OR, TOK_NOT,
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TOK_LPAREN, TOK_RPAREN, TOK_EOF, TOK_NONE, TOK_ERROR
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} Token;
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/*-
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* Structures to handle elegantly the different forms of #if's. The
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* last two fields are stored in condInvert and condDefProc, respectively.
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*/
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static void CondPushBack(Token);
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static int CondGetArg(char **, char **, const char *);
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static Boolean CondDoDefined(int, const char *);
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static int CondStrMatch(const void *, const void *);
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static Boolean CondDoMake(int, const char *);
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static Boolean CondDoExists(int, const char *);
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static Boolean CondDoTarget(int, const char *);
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static Boolean CondDoCommands(int, const char *);
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static Boolean CondCvtArg(char *, double *);
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static Token CondToken(Boolean);
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static Token CondT(Boolean);
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static Token CondF(Boolean);
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static Token CondE(Boolean);
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static int do_Cond_EvalExpression(Boolean *);
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static const struct If {
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const char *form; /* Form of if */
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int formlen; /* Length of form */
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Boolean doNot; /* TRUE if default function should be negated */
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Boolean (*defProc)(int, const char *); /* Default function to apply */
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} ifs[] = {
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{ "def", 3, FALSE, CondDoDefined },
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{ "ndef", 4, TRUE, CondDoDefined },
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{ "make", 4, FALSE, CondDoMake },
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{ "nmake", 5, TRUE, CondDoMake },
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{ "", 0, FALSE, CondDoDefined },
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{ NULL, 0, FALSE, NULL }
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};
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static const struct If *if_info; /* Info for current statement */
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static char *condExpr; /* The expression to parse */
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static Token condPushBack=TOK_NONE; /* Single push-back token used in
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* parsing */
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static unsigned int cond_depth = 0; /* current .if nesting level */
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static unsigned int cond_min_depth = 0; /* depth at makefile open */
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static int
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istoken(const char *str, const char *tok, size_t len)
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{
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return strncmp(str, tok, len) == 0 && !isalpha((unsigned char)str[len]);
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}
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/*-
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*-----------------------------------------------------------------------
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* CondPushBack --
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* Push back the most recent token read. We only need one level of
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* this, so the thing is just stored in 'condPushback'.
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*
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* Input:
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* t Token to push back into the "stream"
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*
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* Results:
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* None.
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||
*
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* Side Effects:
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||
* condPushback is overwritten.
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*
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*-----------------------------------------------------------------------
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*/
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static void
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CondPushBack(Token t)
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{
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condPushBack = t;
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}
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/*-
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||
*-----------------------------------------------------------------------
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||
* CondGetArg --
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* Find the argument of a built-in function.
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*
|
||
* Input:
|
||
* parens TRUE if arg should be bounded by parens
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*
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* Results:
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* The length of the argument and the address of the argument.
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*
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* Side Effects:
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||
* The pointer is set to point to the closing parenthesis of the
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* function call.
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*
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*-----------------------------------------------------------------------
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*/
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static int
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CondGetArg(char **linePtr, char **argPtr, const char *func)
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||
{
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||
char *cp;
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||
int argLen;
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||
Buffer buf;
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||
int paren_depth;
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||
char ch;
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||
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cp = *linePtr;
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if (func != NULL)
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/* Skip opening '(' - verfied by caller */
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cp++;
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if (*cp == '\0') {
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/*
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||
* No arguments whatsoever. Because 'make' and 'defined' aren't really
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* "reserved words", we don't print a message. I think this is better
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* than hitting the user with a warning message every time s/he uses
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* the word 'make' or 'defined' at the beginning of a symbol...
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||
*/
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*argPtr = NULL;
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||
return (0);
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||
}
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while (*cp == ' ' || *cp == '\t') {
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||
cp++;
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||
}
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/*
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* Create a buffer for the argument and start it out at 16 characters
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* long. Why 16? Why not?
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*/
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||
Buf_Init(&buf, 16);
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paren_depth = 0;
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for (;;) {
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ch = *cp;
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if (ch == 0 || ch == ' ' || ch == '\t')
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break;
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||
if ((ch == '&' || ch == '|') && paren_depth == 0)
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||
break;
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||
if (*cp == '$') {
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||
/*
|
||
* Parse the variable spec and install it as part of the argument
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* if it's valid. We tell Var_Parse to complain on an undefined
|
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* variable, so we don't do it too. Nor do we return an error,
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* though perhaps we should...
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||
*/
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||
char *cp2;
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int len;
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||
void *freeIt;
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||
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cp2 = Var_Parse(cp, VAR_CMD, TRUE, &len, &freeIt);
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Buf_AddBytes(&buf, strlen(cp2), cp2);
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if (freeIt)
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free(freeIt);
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||
cp += len;
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||
continue;
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||
}
|
||
if (ch == '(')
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||
paren_depth++;
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||
else
|
||
if (ch == ')' && --paren_depth < 0)
|
||
break;
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||
Buf_AddByte(&buf, *cp);
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cp++;
|
||
}
|
||
|
||
*argPtr = Buf_GetAll(&buf, &argLen);
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||
Buf_Destroy(&buf, FALSE);
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||
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||
while (*cp == ' ' || *cp == '\t') {
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||
cp++;
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||
}
|
||
|
||
if (func != NULL && *cp++ != ')') {
|
||
Parse_Error(PARSE_WARNING, "Missing closing parenthesis for %s()",
|
||
func);
|
||
return (0);
|
||
}
|
||
|
||
*linePtr = cp;
|
||
return (argLen);
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* CondDoDefined --
|
||
* Handle the 'defined' function for conditionals.
|
||
*
|
||
* Results:
|
||
* TRUE if the given variable is defined.
|
||
*
|
||
* Side Effects:
|
||
* None.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
static Boolean
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||
CondDoDefined(int argLen, const char *arg)
|
||
{
|
||
char *p1;
|
||
Boolean result;
|
||
|
||
if (Var_Value(arg, VAR_CMD, &p1) != NULL) {
|
||
result = TRUE;
|
||
} else {
|
||
result = FALSE;
|
||
}
|
||
if (p1)
|
||
free(p1);
|
||
return (result);
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* CondStrMatch --
|
||
* Front-end for Str_Match so it returns 0 on match and non-zero
|
||
* on mismatch. Callback function for CondDoMake via Lst_Find
|
||
*
|
||
* Results:
|
||
* 0 if string matches pattern
|
||
*
|
||
* Side Effects:
|
||
* None
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
static int
|
||
CondStrMatch(const void *string, const void *pattern)
|
||
{
|
||
return(!Str_Match(string, pattern));
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* CondDoMake --
|
||
* Handle the 'make' function for conditionals.
|
||
*
|
||
* Results:
|
||
* TRUE if the given target is being made.
|
||
*
|
||
* Side Effects:
|
||
* None.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
static Boolean
|
||
CondDoMake(int argLen, const char *arg)
|
||
{
|
||
return Lst_Find(create, arg, CondStrMatch) != NULL;
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* CondDoExists --
|
||
* See if the given file exists.
|
||
*
|
||
* Results:
|
||
* TRUE if the file exists and FALSE if it does not.
|
||
*
|
||
* Side Effects:
|
||
* None.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
static Boolean
|
||
CondDoExists(int argLen, const char *arg)
|
||
{
|
||
Boolean result;
|
||
char *path;
|
||
|
||
path = Dir_FindFile(arg, dirSearchPath);
|
||
if (path != NULL) {
|
||
result = TRUE;
|
||
free(path);
|
||
} else {
|
||
result = FALSE;
|
||
}
|
||
if (DEBUG(COND)) {
|
||
fprintf(debug_file, "exists(%s) result is \"%s\"\n",
|
||
arg, path ? path : "");
|
||
}
|
||
return (result);
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* CondDoTarget --
|
||
* See if the given node exists and is an actual target.
|
||
*
|
||
* Results:
|
||
* TRUE if the node exists as a target and FALSE if it does not.
|
||
*
|
||
* Side Effects:
|
||
* None.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
static Boolean
|
||
CondDoTarget(int argLen, const char *arg)
|
||
{
|
||
GNode *gn;
|
||
|
||
gn = Targ_FindNode(arg, TARG_NOCREATE);
|
||
return (gn != NULL) && !OP_NOP(gn->type);
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* CondDoCommands --
|
||
* See if the given node exists and is an actual target with commands
|
||
* associated with it.
|
||
*
|
||
* Results:
|
||
* TRUE if the node exists as a target and has commands associated with
|
||
* it and FALSE if it does not.
|
||
*
|
||
* Side Effects:
|
||
* None.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
static Boolean
|
||
CondDoCommands(int argLen, const char *arg)
|
||
{
|
||
GNode *gn;
|
||
|
||
gn = Targ_FindNode(arg, TARG_NOCREATE);
|
||
return (gn != NULL) && !OP_NOP(gn->type) && !Lst_IsEmpty(gn->commands);
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* CondCvtArg --
|
||
* Convert the given number into a double.
|
||
* We try a base 10 or 16 integer conversion first, if that fails
|
||
* then we try a floating point conversion instead.
|
||
*
|
||
* Results:
|
||
* Sets 'value' to double value of string.
|
||
* Returns 'true' if the convertion suceeded
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
static Boolean
|
||
CondCvtArg(char *str, double *value)
|
||
{
|
||
char *eptr, ech;
|
||
unsigned long l_val;
|
||
double d_val;
|
||
|
||
errno = 0;
|
||
l_val = strtoul(str, &eptr, str[1] == 'x' ? 16 : 10);
|
||
ech = *eptr;
|
||
if (ech == 0 && errno != ERANGE) {
|
||
d_val = str[0] == '-' ? -(double)-l_val : (double)l_val;
|
||
} else {
|
||
if (ech != 0 && ech != '.' && ech != 'e' && ech != 'E')
|
||
return FALSE;
|
||
d_val = strtod(str, &eptr);
|
||
if (*eptr)
|
||
return FALSE;
|
||
}
|
||
|
||
*value = d_val;
|
||
return TRUE;
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* CondGetString --
|
||
* Get a string from a variable reference or an optionally quoted
|
||
* string. This is called for the lhs and rhs of string compares.
|
||
*
|
||
* Results:
|
||
* Sets freeIt if needed,
|
||
* Sets quoted if string was quoted,
|
||
* Returns NULL on error,
|
||
* else returns string - absent any quotes.
|
||
*
|
||
* Side Effects:
|
||
* Moves condExpr to end of this token.
|
||
*
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
/* coverity:[+alloc : arg-*2] */
|
||
static char *
|
||
CondGetString(Boolean doEval, Boolean *quoted, void **freeIt)
|
||
{
|
||
Buffer buf;
|
||
char *cp;
|
||
char *str;
|
||
int len;
|
||
int qt;
|
||
char *start;
|
||
|
||
Buf_Init(&buf, 0);
|
||
str = NULL;
|
||
*freeIt = NULL;
|
||
*quoted = qt = *condExpr == '"' ? 1 : 0;
|
||
if (qt)
|
||
condExpr++;
|
||
for (start = condExpr; *condExpr && str == NULL; condExpr++) {
|
||
switch (*condExpr) {
|
||
case '\\':
|
||
if (condExpr[1] != '\0') {
|
||
condExpr++;
|
||
Buf_AddByte(&buf, *condExpr);
|
||
}
|
||
break;
|
||
case '"':
|
||
if (qt) {
|
||
condExpr++; /* we don't want the quotes */
|
||
goto got_str;
|
||
} else
|
||
Buf_AddByte(&buf, *condExpr); /* likely? */
|
||
break;
|
||
case ')':
|
||
case '!':
|
||
case '=':
|
||
case '>':
|
||
case '<':
|
||
case ' ':
|
||
case '\t':
|
||
if (!qt)
|
||
goto got_str;
|
||
else
|
||
Buf_AddByte(&buf, *condExpr);
|
||
break;
|
||
case '$':
|
||
/* if we are in quotes, then an undefined variable is ok */
|
||
str = Var_Parse(condExpr, VAR_CMD, (qt ? 0 : doEval),
|
||
&len, freeIt);
|
||
if (str == var_Error) {
|
||
if (*freeIt) {
|
||
free(*freeIt);
|
||
*freeIt = NULL;
|
||
}
|
||
/*
|
||
* Even if !doEval, we still report syntax errors, which
|
||
* is what getting var_Error back with !doEval means.
|
||
*/
|
||
str = NULL;
|
||
goto cleanup;
|
||
}
|
||
condExpr += len;
|
||
/*
|
||
* If the '$' was first char (no quotes), and we are
|
||
* followed by space, the operator or end of expression,
|
||
* we are done.
|
||
*/
|
||
if ((condExpr == start + len) &&
|
||
(*condExpr == '\0' ||
|
||
isspace((unsigned char) *condExpr) ||
|
||
strchr("!=><)", *condExpr))) {
|
||
goto cleanup;
|
||
}
|
||
/*
|
||
* Nope, we better copy str to buf
|
||
*/
|
||
for (cp = str; *cp; cp++) {
|
||
Buf_AddByte(&buf, *cp);
|
||
}
|
||
if (*freeIt) {
|
||
free(*freeIt);
|
||
*freeIt = NULL;
|
||
}
|
||
str = NULL; /* not finished yet */
|
||
condExpr--; /* don't skip over next char */
|
||
break;
|
||
default:
|
||
Buf_AddByte(&buf, *condExpr);
|
||
break;
|
||
}
|
||
}
|
||
got_str:
|
||
str = Buf_GetAll(&buf, NULL);
|
||
*freeIt = str;
|
||
cleanup:
|
||
Buf_Destroy(&buf, FALSE);
|
||
return str;
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* CondToken --
|
||
* Return the next token from the input.
|
||
*
|
||
* Results:
|
||
* A Token for the next lexical token in the stream.
|
||
*
|
||
* Side Effects:
|
||
* condPushback will be set back to TOK_NONE if it is used.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
static Token
|
||
compare_expression(Boolean doEval)
|
||
{
|
||
Token t;
|
||
char *lhs;
|
||
char *rhs;
|
||
char *op;
|
||
void *lhsFree;
|
||
void *rhsFree;
|
||
Boolean lhsQuoted;
|
||
Boolean rhsQuoted;
|
||
double left, right;
|
||
|
||
t = TOK_ERROR;
|
||
rhs = NULL;
|
||
lhsFree = rhsFree = FALSE;
|
||
lhsQuoted = rhsQuoted = FALSE;
|
||
|
||
/*
|
||
* Parse the variable spec and skip over it, saving its
|
||
* value in lhs.
|
||
*/
|
||
lhs = CondGetString(doEval, &lhsQuoted, &lhsFree);
|
||
if (!lhs)
|
||
goto done;
|
||
|
||
/*
|
||
* Skip whitespace to get to the operator
|
||
*/
|
||
while (isspace((unsigned char) *condExpr))
|
||
condExpr++;
|
||
|
||
/*
|
||
* Make sure the operator is a valid one. If it isn't a
|
||
* known relational operator, pretend we got a
|
||
* != 0 comparison.
|
||
*/
|
||
op = condExpr;
|
||
switch (*condExpr) {
|
||
case '!':
|
||
case '=':
|
||
case '<':
|
||
case '>':
|
||
if (condExpr[1] == '=') {
|
||
condExpr += 2;
|
||
} else {
|
||
condExpr += 1;
|
||
}
|
||
break;
|
||
default:
|
||
if (!doEval) {
|
||
t = TOK_FALSE;
|
||
goto done;
|
||
}
|
||
/* For .ifxxx "..." check for non-empty string. */
|
||
if (lhsQuoted) {
|
||
t = lhs[0] != 0;
|
||
goto done;
|
||
}
|
||
/* For .ifxxx <number> compare against zero */
|
||
if (CondCvtArg(lhs, &left)) {
|
||
t = left != 0.0;
|
||
goto done;
|
||
}
|
||
/* For .if ${...} check for non-empty string (defProc is ifdef). */
|
||
if (if_info->form[0] == 0) {
|
||
t = lhs[0] != 0;
|
||
goto done;
|
||
}
|
||
/* Otherwise action default test ... */
|
||
t = if_info->defProc(strlen(lhs), lhs) != if_info->doNot;
|
||
goto done;
|
||
}
|
||
|
||
while (isspace((unsigned char)*condExpr))
|
||
condExpr++;
|
||
|
||
if (*condExpr == '\0') {
|
||
Parse_Error(PARSE_WARNING,
|
||
"Missing right-hand-side of operator");
|
||
goto done;
|
||
}
|
||
|
||
rhs = CondGetString(doEval, &rhsQuoted, &rhsFree);
|
||
if (!rhs)
|
||
goto done;
|
||
|
||
if (rhsQuoted || lhsQuoted) {
|
||
do_string_compare:
|
||
if (((*op != '!') && (*op != '=')) || (op[1] != '=')) {
|
||
Parse_Error(PARSE_WARNING,
|
||
"String comparison operator should be either == or !=");
|
||
goto done;
|
||
}
|
||
|
||
if (DEBUG(COND)) {
|
||
fprintf(debug_file, "lhs = \"%s\", rhs = \"%s\", op = %.2s\n",
|
||
lhs, rhs, op);
|
||
}
|
||
/*
|
||
* Null-terminate rhs and perform the comparison.
|
||
* t is set to the result.
|
||
*/
|
||
if (*op == '=') {
|
||
t = strcmp(lhs, rhs) == 0;
|
||
} else {
|
||
t = strcmp(lhs, rhs) != 0;
|
||
}
|
||
} else {
|
||
/*
|
||
* rhs is either a float or an integer. Convert both the
|
||
* lhs and the rhs to a double and compare the two.
|
||
*/
|
||
|
||
if (!CondCvtArg(lhs, &left) || !CondCvtArg(rhs, &right))
|
||
goto do_string_compare;
|
||
|
||
if (DEBUG(COND)) {
|
||
fprintf(debug_file, "left = %f, right = %f, op = %.2s\n", left,
|
||
right, op);
|
||
}
|
||
switch(op[0]) {
|
||
case '!':
|
||
if (op[1] != '=') {
|
||
Parse_Error(PARSE_WARNING,
|
||
"Unknown operator");
|
||
goto done;
|
||
}
|
||
t = (left != right);
|
||
break;
|
||
case '=':
|
||
if (op[1] != '=') {
|
||
Parse_Error(PARSE_WARNING,
|
||
"Unknown operator");
|
||
goto done;
|
||
}
|
||
t = (left == right);
|
||
break;
|
||
case '<':
|
||
if (op[1] == '=') {
|
||
t = (left <= right);
|
||
} else {
|
||
t = (left < right);
|
||
}
|
||
break;
|
||
case '>':
|
||
if (op[1] == '=') {
|
||
t = (left >= right);
|
||
} else {
|
||
t = (left > right);
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
done:
|
||
if (lhsFree)
|
||
free(lhsFree);
|
||
if (rhsFree)
|
||
free(rhsFree);
|
||
return t;
|
||
}
|
||
|
||
static int
|
||
get_mpt_arg(char **linePtr, char **argPtr, const char *func)
|
||
{
|
||
/*
|
||
* Use Var_Parse to parse the spec in parens and return
|
||
* TOK_TRUE if the resulting string is empty.
|
||
*/
|
||
int length;
|
||
void *freeIt;
|
||
char *val;
|
||
char *cp = *linePtr;
|
||
|
||
/* We do all the work here and return the result as the length */
|
||
*argPtr = NULL;
|
||
|
||
val = Var_Parse(cp - 1, VAR_CMD, FALSE, &length, &freeIt);
|
||
/*
|
||
* Advance *linePtr to beyond the closing ). Note that
|
||
* we subtract one because 'length' is calculated from 'cp - 1'.
|
||
*/
|
||
*linePtr = cp - 1 + length;
|
||
|
||
if (val == var_Error) {
|
||
free(freeIt);
|
||
return -1;
|
||
}
|
||
|
||
/* A variable is empty when it just contains spaces... 4/15/92, christos */
|
||
while (isspace(*(unsigned char *)val))
|
||
val++;
|
||
|
||
/*
|
||
* For consistency with the other functions we can't generate the
|
||
* true/false here.
|
||
*/
|
||
length = *val ? 2 : 1;
|
||
if (freeIt)
|
||
free(freeIt);
|
||
return length;
|
||
}
|
||
|
||
static Boolean
|
||
CondDoEmpty(int arglen, const char *arg)
|
||
{
|
||
return arglen == 1;
|
||
}
|
||
|
||
static Token
|
||
compare_function(Boolean doEval)
|
||
{
|
||
static const struct fn_def {
|
||
const char *fn_name;
|
||
int fn_name_len;
|
||
int (*fn_getarg)(char **, char **, const char *);
|
||
Boolean (*fn_proc)(int, const char *);
|
||
} fn_defs[] = {
|
||
{ "defined", 7, CondGetArg, CondDoDefined },
|
||
{ "make", 4, CondGetArg, CondDoMake },
|
||
{ "exists", 6, CondGetArg, CondDoExists },
|
||
{ "empty", 5, get_mpt_arg, CondDoEmpty },
|
||
{ "target", 6, CondGetArg, CondDoTarget },
|
||
{ "commands", 8, CondGetArg, CondDoCommands },
|
||
{ NULL, 0, NULL, NULL },
|
||
};
|
||
const struct fn_def *fn_def;
|
||
Token t;
|
||
char *arg = NULL;
|
||
int arglen;
|
||
char *cp = condExpr;
|
||
char *cp1;
|
||
|
||
for (fn_def = fn_defs; fn_def->fn_name != NULL; fn_def++) {
|
||
if (!istoken(cp, fn_def->fn_name, fn_def->fn_name_len))
|
||
continue;
|
||
cp += fn_def->fn_name_len;
|
||
/* There can only be whitespace before the '(' */
|
||
while (isspace(*(unsigned char *)cp))
|
||
cp++;
|
||
if (*cp != '(')
|
||
break;
|
||
|
||
arglen = fn_def->fn_getarg(&cp, &arg, fn_def->fn_name);
|
||
if (arglen <= 0) {
|
||
condExpr = cp;
|
||
return arglen < 0 ? TOK_ERROR : TOK_FALSE;
|
||
}
|
||
/* Evaluate the argument using the required function. */
|
||
t = !doEval || fn_def->fn_proc(arglen, arg);
|
||
if (arg)
|
||
free(arg);
|
||
condExpr = cp;
|
||
return t;
|
||
}
|
||
|
||
/* Push anything numeric through the compare expression */
|
||
cp = condExpr;
|
||
if (isdigit((unsigned char)cp[0]) || strchr("+-", cp[0]))
|
||
return compare_expression(doEval);
|
||
|
||
/*
|
||
* Most likely we have a naked token to apply the default function to.
|
||
* However ".if a == b" gets here when the "a" is unquoted and doesn't
|
||
* start with a '$'. This surprises people.
|
||
* If what follows the function argument is a '=' or '!' then the syntax
|
||
* would be invalid if we did "defined(a)" - so instead treat as an
|
||
* expression.
|
||
*/
|
||
arglen = CondGetArg(&cp, &arg, NULL);
|
||
for (cp1 = cp; isspace(*(unsigned char *)cp1); cp1++)
|
||
continue;
|
||
if (*cp1 == '=' || *cp1 == '!')
|
||
return compare_expression(doEval);
|
||
condExpr = cp;
|
||
|
||
/*
|
||
* Evaluate the argument using the default function.
|
||
* This path always treats .if as .ifdef. To get here the character
|
||
* after .if must have been taken literally, so the argument cannot
|
||
* be empty - even if it contained a variable expansion.
|
||
*/
|
||
t = !doEval || if_info->defProc(arglen, arg) != if_info->doNot;
|
||
if (arg)
|
||
free(arg);
|
||
return t;
|
||
}
|
||
|
||
static Token
|
||
CondToken(Boolean doEval)
|
||
{
|
||
Token t;
|
||
|
||
t = condPushBack;
|
||
if (t != TOK_NONE) {
|
||
condPushBack = TOK_NONE;
|
||
return t;
|
||
}
|
||
|
||
while (*condExpr == ' ' || *condExpr == '\t') {
|
||
condExpr++;
|
||
}
|
||
|
||
switch (*condExpr) {
|
||
|
||
case '(':
|
||
condExpr++;
|
||
return TOK_LPAREN;
|
||
|
||
case ')':
|
||
condExpr++;
|
||
return TOK_RPAREN;
|
||
|
||
case '|':
|
||
if (condExpr[1] == '|') {
|
||
condExpr++;
|
||
}
|
||
condExpr++;
|
||
return TOK_OR;
|
||
|
||
case '&':
|
||
if (condExpr[1] == '&') {
|
||
condExpr++;
|
||
}
|
||
condExpr++;
|
||
return TOK_AND;
|
||
|
||
case '!':
|
||
condExpr++;
|
||
return TOK_NOT;
|
||
|
||
case '#':
|
||
case '\n':
|
||
case '\0':
|
||
return TOK_EOF;
|
||
|
||
case '"':
|
||
case '$':
|
||
return compare_expression(doEval);
|
||
|
||
default:
|
||
return compare_function(doEval);
|
||
}
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* CondT --
|
||
* Parse a single term in the expression. This consists of a terminal
|
||
* symbol or TOK_NOT and a terminal symbol (not including the binary
|
||
* operators):
|
||
* T -> defined(variable) | make(target) | exists(file) | symbol
|
||
* T -> ! T | ( E )
|
||
*
|
||
* Results:
|
||
* TOK_TRUE, TOK_FALSE or TOK_ERROR.
|
||
*
|
||
* Side Effects:
|
||
* Tokens are consumed.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
static Token
|
||
CondT(Boolean doEval)
|
||
{
|
||
Token t;
|
||
|
||
t = CondToken(doEval);
|
||
|
||
if (t == TOK_EOF) {
|
||
/*
|
||
* If we reached the end of the expression, the expression
|
||
* is malformed...
|
||
*/
|
||
t = TOK_ERROR;
|
||
} else if (t == TOK_LPAREN) {
|
||
/*
|
||
* T -> ( E )
|
||
*/
|
||
t = CondE(doEval);
|
||
if (t != TOK_ERROR) {
|
||
if (CondToken(doEval) != TOK_RPAREN) {
|
||
t = TOK_ERROR;
|
||
}
|
||
}
|
||
} else if (t == TOK_NOT) {
|
||
t = CondT(doEval);
|
||
if (t == TOK_TRUE) {
|
||
t = TOK_FALSE;
|
||
} else if (t == TOK_FALSE) {
|
||
t = TOK_TRUE;
|
||
}
|
||
}
|
||
return (t);
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* CondF --
|
||
* Parse a conjunctive factor (nice name, wot?)
|
||
* F -> T && F | T
|
||
*
|
||
* Results:
|
||
* TOK_TRUE, TOK_FALSE or TOK_ERROR
|
||
*
|
||
* Side Effects:
|
||
* Tokens are consumed.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
static Token
|
||
CondF(Boolean doEval)
|
||
{
|
||
Token l, o;
|
||
|
||
l = CondT(doEval);
|
||
if (l != TOK_ERROR) {
|
||
o = CondToken(doEval);
|
||
|
||
if (o == TOK_AND) {
|
||
/*
|
||
* F -> T && F
|
||
*
|
||
* If T is TOK_FALSE, the whole thing will be TOK_FALSE, but we have to
|
||
* parse the r.h.s. anyway (to throw it away).
|
||
* If T is TOK_TRUE, the result is the r.h.s., be it an TOK_ERROR or no.
|
||
*/
|
||
if (l == TOK_TRUE) {
|
||
l = CondF(doEval);
|
||
} else {
|
||
(void)CondF(FALSE);
|
||
}
|
||
} else {
|
||
/*
|
||
* F -> T
|
||
*/
|
||
CondPushBack(o);
|
||
}
|
||
}
|
||
return (l);
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* CondE --
|
||
* Main expression production.
|
||
* E -> F || E | F
|
||
*
|
||
* Results:
|
||
* TOK_TRUE, TOK_FALSE or TOK_ERROR.
|
||
*
|
||
* Side Effects:
|
||
* Tokens are, of course, consumed.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
static Token
|
||
CondE(Boolean doEval)
|
||
{
|
||
Token l, o;
|
||
|
||
l = CondF(doEval);
|
||
if (l != TOK_ERROR) {
|
||
o = CondToken(doEval);
|
||
|
||
if (o == TOK_OR) {
|
||
/*
|
||
* E -> F || E
|
||
*
|
||
* A similar thing occurs for ||, except that here we make sure
|
||
* the l.h.s. is TOK_FALSE before we bother to evaluate the r.h.s.
|
||
* Once again, if l is TOK_FALSE, the result is the r.h.s. and once
|
||
* again if l is TOK_TRUE, we parse the r.h.s. to throw it away.
|
||
*/
|
||
if (l == TOK_FALSE) {
|
||
l = CondE(doEval);
|
||
} else {
|
||
(void)CondE(FALSE);
|
||
}
|
||
} else {
|
||
/*
|
||
* E -> F
|
||
*/
|
||
CondPushBack(o);
|
||
}
|
||
}
|
||
return (l);
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* Cond_EvalExpression --
|
||
* Evaluate an expression in the passed line. The expression
|
||
* consists of &&, ||, !, make(target), defined(variable)
|
||
* and parenthetical groupings thereof.
|
||
*
|
||
* Results:
|
||
* COND_PARSE if the condition was valid grammatically
|
||
* COND_INVALID if not a valid conditional.
|
||
*
|
||
* (*value) is set to the boolean value of the condition
|
||
*
|
||
* Side Effects:
|
||
* None.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
int
|
||
Cond_EvalExpression(const struct If *info, char *line, Boolean *value, int eprint)
|
||
{
|
||
static const struct If *dflt_info;
|
||
const struct If *sv_if_info = if_info;
|
||
char *sv_condExpr = condExpr;
|
||
Token sv_condPushBack = condPushBack;
|
||
int rval;
|
||
|
||
while (*line == ' ' || *line == '\t')
|
||
line++;
|
||
|
||
if (info == NULL && (info = dflt_info) == NULL) {
|
||
/* Scan for the entry for .if - it can't be first */
|
||
for (info = ifs; ; info++)
|
||
if (info->form[0] == 0)
|
||
break;
|
||
dflt_info = info;
|
||
}
|
||
|
||
if_info = info != NULL ? info : ifs + 4;
|
||
condExpr = line;
|
||
condPushBack = TOK_NONE;
|
||
|
||
rval = do_Cond_EvalExpression(value);
|
||
|
||
if (rval == COND_INVALID && eprint)
|
||
Parse_Error(PARSE_FATAL, "Malformed conditional (%s)", line);
|
||
|
||
if_info = sv_if_info;
|
||
condExpr = sv_condExpr;
|
||
condPushBack = sv_condPushBack;
|
||
|
||
return rval;
|
||
}
|
||
|
||
static int
|
||
do_Cond_EvalExpression(Boolean *value)
|
||
{
|
||
|
||
switch (CondE(TRUE)) {
|
||
case TOK_TRUE:
|
||
if (CondToken(TRUE) == TOK_EOF) {
|
||
*value = TRUE;
|
||
return COND_PARSE;
|
||
}
|
||
break;
|
||
case TOK_FALSE:
|
||
if (CondToken(TRUE) == TOK_EOF) {
|
||
*value = FALSE;
|
||
return COND_PARSE;
|
||
}
|
||
break;
|
||
default:
|
||
case TOK_ERROR:
|
||
break;
|
||
}
|
||
|
||
return COND_INVALID;
|
||
}
|
||
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* Cond_Eval --
|
||
* Evaluate the conditional in the passed line. The line
|
||
* looks like this:
|
||
* .<cond-type> <expr>
|
||
* where <cond-type> is any of if, ifmake, ifnmake, ifdef,
|
||
* ifndef, elif, elifmake, elifnmake, elifdef, elifndef
|
||
* and <expr> consists of &&, ||, !, make(target), defined(variable)
|
||
* and parenthetical groupings thereof.
|
||
*
|
||
* Input:
|
||
* line Line to parse
|
||
*
|
||
* Results:
|
||
* COND_PARSE if should parse lines after the conditional
|
||
* COND_SKIP if should skip lines after the conditional
|
||
* COND_INVALID if not a valid conditional.
|
||
*
|
||
* Side Effects:
|
||
* None.
|
||
*
|
||
* Note that the states IF_ACTIVE and ELSE_ACTIVE are only different in order
|
||
* to detect splurious .else lines (as are SKIP_TO_ELSE and SKIP_TO_ENDIF)
|
||
* otherwise .else could be treated as '.elif 1'.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
int
|
||
Cond_Eval(char *line)
|
||
{
|
||
#define MAXIF 64 /* maximum depth of .if'ing */
|
||
enum if_states {
|
||
IF_ACTIVE, /* .if or .elif part active */
|
||
ELSE_ACTIVE, /* .else part active */
|
||
SEARCH_FOR_ELIF, /* searching for .elif/else to execute */
|
||
SKIP_TO_ELSE, /* has been true, but not seen '.else' */
|
||
SKIP_TO_ENDIF /* nothing else to execute */
|
||
};
|
||
static enum if_states cond_state[MAXIF + 1] = { IF_ACTIVE };
|
||
|
||
const struct If *ifp;
|
||
Boolean isElif;
|
||
Boolean value;
|
||
int level; /* Level at which to report errors. */
|
||
enum if_states state;
|
||
|
||
level = PARSE_FATAL;
|
||
|
||
/* skip leading character (the '.') and any whitespace */
|
||
for (line++; *line == ' ' || *line == '\t'; line++)
|
||
continue;
|
||
|
||
/* Find what type of if we're dealing with. */
|
||
if (line[0] == 'e') {
|
||
if (line[1] != 'l') {
|
||
if (!istoken(line + 1, "ndif", 4))
|
||
return COND_INVALID;
|
||
/* End of conditional section */
|
||
if (cond_depth == cond_min_depth) {
|
||
Parse_Error(level, "if-less endif");
|
||
return COND_PARSE;
|
||
}
|
||
/* Return state for previous conditional */
|
||
cond_depth--;
|
||
if (cond_depth > MAXIF)
|
||
return COND_SKIP;
|
||
return cond_state[cond_depth] <= ELSE_ACTIVE ? COND_PARSE : COND_SKIP;
|
||
}
|
||
|
||
/* Quite likely this is 'else' or 'elif' */
|
||
line += 2;
|
||
if (istoken(line, "se", 2)) {
|
||
/* It is else... */
|
||
if (cond_depth == cond_min_depth) {
|
||
Parse_Error(level, "if-less else");
|
||
return COND_PARSE;
|
||
}
|
||
|
||
if (cond_depth > MAXIF)
|
||
return COND_SKIP;
|
||
state = cond_state[cond_depth];
|
||
switch (state) {
|
||
case SEARCH_FOR_ELIF:
|
||
state = ELSE_ACTIVE;
|
||
break;
|
||
case ELSE_ACTIVE:
|
||
case SKIP_TO_ENDIF:
|
||
Parse_Error(PARSE_WARNING, "extra else");
|
||
/* FALLTHROUGH */
|
||
default:
|
||
case IF_ACTIVE:
|
||
case SKIP_TO_ELSE:
|
||
state = SKIP_TO_ENDIF;
|
||
break;
|
||
}
|
||
cond_state[cond_depth] = state;
|
||
return state <= ELSE_ACTIVE ? COND_PARSE : COND_SKIP;
|
||
}
|
||
/* Assume for now it is an elif */
|
||
isElif = TRUE;
|
||
} else
|
||
isElif = FALSE;
|
||
|
||
if (line[0] != 'i' || line[1] != 'f')
|
||
/* Not an ifxxx or elifxxx line */
|
||
return COND_INVALID;
|
||
|
||
/*
|
||
* Figure out what sort of conditional it is -- what its default
|
||
* function is, etc. -- by looking in the table of valid "ifs"
|
||
*/
|
||
line += 2;
|
||
for (ifp = ifs; ; ifp++) {
|
||
if (ifp->form == NULL)
|
||
return COND_INVALID;
|
||
if (istoken(ifp->form, line, ifp->formlen)) {
|
||
line += ifp->formlen;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Now we know what sort of 'if' it is... */
|
||
|
||
if (isElif) {
|
||
if (cond_depth == cond_min_depth) {
|
||
Parse_Error(level, "if-less elif");
|
||
return COND_PARSE;
|
||
}
|
||
if (cond_depth > MAXIF)
|
||
/* Error reported when we saw the .if ... */
|
||
return COND_SKIP;
|
||
state = cond_state[cond_depth];
|
||
if (state == SKIP_TO_ENDIF || state == ELSE_ACTIVE) {
|
||
Parse_Error(PARSE_WARNING, "extra elif");
|
||
cond_state[cond_depth] = SKIP_TO_ENDIF;
|
||
return COND_SKIP;
|
||
}
|
||
if (state != SEARCH_FOR_ELIF) {
|
||
/* Either just finished the 'true' block, or already SKIP_TO_ELSE */
|
||
cond_state[cond_depth] = SKIP_TO_ELSE;
|
||
return COND_SKIP;
|
||
}
|
||
} else {
|
||
/* Normal .if */
|
||
if (cond_depth >= MAXIF) {
|
||
cond_depth++;
|
||
Parse_Error(PARSE_FATAL, "Too many nested if's. %d max.", MAXIF);
|
||
return COND_SKIP;
|
||
}
|
||
state = cond_state[cond_depth];
|
||
cond_depth++;
|
||
if (state > ELSE_ACTIVE) {
|
||
/* If we aren't parsing the data, treat as always false */
|
||
cond_state[cond_depth] = SKIP_TO_ELSE;
|
||
return COND_SKIP;
|
||
}
|
||
}
|
||
|
||
/* And evaluate the conditional expresssion */
|
||
if (Cond_EvalExpression(ifp, line, &value, 1) == COND_INVALID) {
|
||
/* Syntax error in conditional, error message already output. */
|
||
/* Skip everything to matching .endif */
|
||
cond_state[cond_depth] = SKIP_TO_ELSE;
|
||
return COND_SKIP;
|
||
}
|
||
|
||
if (!value) {
|
||
cond_state[cond_depth] = SEARCH_FOR_ELIF;
|
||
return COND_SKIP;
|
||
}
|
||
cond_state[cond_depth] = IF_ACTIVE;
|
||
return COND_PARSE;
|
||
}
|
||
|
||
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* Cond_End --
|
||
* Make sure everything's clean at the end of a makefile.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side Effects:
|
||
* Parse_Error will be called if open conditionals are around.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
void
|
||
Cond_restore_depth(unsigned int saved_depth)
|
||
{
|
||
int open_conds = cond_depth - cond_min_depth;
|
||
|
||
if (open_conds != 0 || saved_depth > cond_depth) {
|
||
Parse_Error(PARSE_FATAL, "%d open conditional%s", open_conds,
|
||
open_conds == 1 ? "" : "s");
|
||
cond_depth = cond_min_depth;
|
||
}
|
||
|
||
cond_min_depth = saved_depth;
|
||
}
|
||
|
||
unsigned int
|
||
Cond_save_depth(void)
|
||
{
|
||
int depth = cond_min_depth;
|
||
|
||
cond_min_depth = cond_depth;
|
||
return depth;
|
||
}
|