import the required bits of bootstrap-pkgsrc from 20040311.

1 files changed, 1352 insertions, 0 deletions

diff --git a/bootstrap/bmake/cond.c b/bootstrap/bmake/cond.c
new file mode 100644
index 00000000000..8fdb30ca07b
--- /dev/null
+++ b/bootstrap/bmake/cond.c
@@ -0,0 +1,1352 @@
+/*	$NetBSD: cond.c,v 1.1.1.1 2004/03/11 13:04:01 grant Exp $	*/
+
+/*
+ * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
+ * Copyright (c) 1988, 1989 by Adam de Boor
+ * Copyright (c) 1989 by Berkeley Softworks
+ * 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.
+ */
+
+#ifdef MAKE_BOOTSTRAP
+static char rcsid[] = "$NetBSD: cond.c,v 1.1.1.1 2004/03/11 13:04:01 grant Exp $";
+#else
+#include <sys/cdefs.h>
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)cond.c	8.2 (Berkeley) 1/2/94";
+#else
+__RCSID("$NetBSD: cond.c,v 1.1.1.1 2004/03/11 13:04:01 grant Exp $");
+#endif
+#endif /* not lint */
+#endif
+
+/*-
+ * cond.c --
+ *	Functions to handle conditionals in a makefile.
+ *
+ * Interface:
+ *	Cond_Eval 	Evaluate the conditional in the passed line.
+ *
+ */
+
+#include    <ctype.h>
+#include    <math.h>
+#include    "make.h"
+#include    "hash.h"
+#include    "dir.h"
+#include    "buf.h"
+
+/*
+ * The parsing of conditional expressions is based on this grammar:
+ *	E -> F || E
+ *	E -> F
+ *	F -> T && F
+ *	F -> T
+ *	T -> defined(variable)
+ *	T -> make(target)
+ *	T -> exists(file)
+ *	T -> empty(varspec)
+ *	T -> target(name)
+ *	T -> commands(name)
+ *	T -> symbol
+ *	T -> $(varspec) op value
+ *	T -> $(varspec) == "string"
+ *	T -> $(varspec) != "string"
+ *	T -> ( E )
+ *	T -> ! T
+ *	op -> == | != | > | < | >= | <=
+ *
+ * 'symbol' is some other symbol to which the default function (condDefProc)
+ * is applied.
+ *
+ * Tokens are scanned from the 'condExpr' string. The scanner (CondToken)
+ * will return And for '&' and '&&', Or for '|' and '||', Not for '!',
+ * LParen for '(', RParen for ')' and will evaluate the other terminal
+ * symbols, using either the default function or the function given in the
+ * terminal, and return the result as either True or False.
+ *
+ * All Non-Terminal functions (CondE, CondF and CondT) return Err on error.
+ */
+typedef enum {
+    And, Or, Not, True, False, LParen, RParen, EndOfFile, None, Err
+} Token;
+
+/*-
+ * Structures to handle elegantly the different forms of #if's. The
+ * last two fields are stored in condInvert and condDefProc, respectively.
+ */
+static void CondPushBack __P((Token));
+static int CondGetArg __P((char **, char **, char *, Boolean));
+static Boolean CondDoDefined __P((int, char *));
+static int CondStrMatch __P((ClientData, ClientData));
+static Boolean CondDoMake __P((int, char *));
+static Boolean CondDoExists __P((int, char *));
+static Boolean CondDoTarget __P((int, char *));
+static Boolean CondDoCommands __P((int, char *));
+static Boolean CondCvtArg __P((char *, double *));
+static Token CondToken __P((Boolean));
+static Token CondT __P((Boolean));
+static Token CondF __P((Boolean));
+static Token CondE __P((Boolean));
+
+static struct If {
+    char	*form;	      /* Form of if */
+    int		formlen;      /* Length of form */
+    Boolean	doNot;	      /* TRUE if default function should be negated */
+    Boolean	(*defProc) __P((int, char *)); /* Default function to apply */
+} ifs[] = {
+    { "ifdef",	  5,	  FALSE,  CondDoDefined },
+    { "ifndef",	  6,	  TRUE,	  CondDoDefined },
+    { "ifmake",	  6,	  FALSE,  CondDoMake },
+    { "ifnmake",  7,	  TRUE,	  CondDoMake },
+    { "if",	  2,	  FALSE,  CondDoDefined },
+    { NULL,	  0,	  FALSE,  NULL }
+};
+
+static Boolean	  condInvert;	    	/* Invert the default function */
+static Boolean	  (*condDefProc)	/* Default function to apply */
+		    __P((int, char *));
+static char 	  *condExpr;	    	/* The expression to parse */
+static Token	  condPushBack=None;	/* Single push-back token used in
+					 * parsing */
+
+#define	MAXIF		30	  /* greatest depth of #if'ing */
+
+static Boolean	  condStack[MAXIF]; 	/* Stack of conditionals's values */
+static int  	  condTop = MAXIF;  	/* Top-most conditional */
+static int  	  skipIfLevel=0;    	/* Depth of skipped conditionals */
+static Boolean	  skipLine = FALSE; 	/* Whether the parse module is skipping
+					 * lines */
+
+/*-
+ *-----------------------------------------------------------------------
+ * CondPushBack --
+ *	Push back the most recent token read. We only need one level of
+ *	this, so the thing is just stored in 'condPushback'.
+ *
+ * Results:
+ *	None.
+ *
+ * Side Effects:
+ *	condPushback is overwritten.
+ *
+ *-----------------------------------------------------------------------
+ */
+static void
+CondPushBack (t)
+    Token   	  t;	/* Token to push back into the "stream" */
+{
+    condPushBack = t;
+}
+
+/*-
+ *-----------------------------------------------------------------------
+ * CondGetArg --
+ *	Find the argument of a built-in function.
+ *
+ * Results:
+ *	The length of the argument and the address of the argument.
+ *
+ * Side Effects:
+ *	The pointer is set to point to the closing parenthesis of the
+ *	function call.
+ *
+ *-----------------------------------------------------------------------
+ */
+static int
+CondGetArg (linePtr, argPtr, func, parens)
+    char    	  **linePtr;
+    char    	  **argPtr;
+    char    	  *func;
+    Boolean 	  parens;   	/* TRUE if arg should be bounded by parens */
+{
+    register char *cp;
+    int	    	  argLen;
+    register Buffer buf;
+
+    cp = *linePtr;
+    if (parens) {
+	while (*cp != '(' && *cp != '\0') {
+	    cp++;
+	}
+	if (*cp == '(') {
+	    cp++;
+	}
+    }
+
+    if (*cp == '\0') {
+	/*
+	 * No arguments whatsoever. Because 'make' and 'defined' aren't really
+	 * "reserved words", we don't print a message. I think this is better
+	 * than hitting the user with a warning message every time s/he uses
+	 * the word 'make' or 'defined' at the beginning of a symbol...
+	 */
+	*argPtr = cp;
+	return (0);
+    }
+
+    while (*cp == ' ' || *cp == '\t') {
+	cp++;
+    }
+
+    /*
+     * Create a buffer for the argument and start it out at 16 characters
+     * long. Why 16? Why not?
+     */
+    buf = Buf_Init(16);
+
+    while ((strchr(" \t)&|", *cp) == (char *)NULL) && (*cp != '\0')) {
+	if (*cp == '$') {
+	    /*
+	     * Parse the variable spec and install it as part of the argument
+	     * if it's valid. We tell Var_Parse to complain on an undefined
+	     * variable, so we don't do it too. Nor do we return an error,
+	     * though perhaps we should...
+	     */
+	    char  	*cp2;
+	    int		len;
+	    Boolean	doFree;
+
+	    cp2 = Var_Parse(cp, VAR_CMD, TRUE, &len, &doFree);
+
+	    Buf_AddBytes(buf, strlen(cp2), (Byte *)cp2);
+	    if (doFree) {
+		free(cp2);
+	    }
+	    cp += len;
+	} else {
+	    Buf_AddByte(buf, (Byte)*cp);
+	    cp++;
+	}
+    }
+
+    Buf_AddByte(buf, (Byte)'\0');
+    *argPtr = (char *)Buf_GetAll(buf, &argLen);
+    Buf_Destroy(buf, FALSE);
+
+    while (*cp == ' ' || *cp == '\t') {
+	cp++;
+    }
+    if (parens && *cp != ')') {
+	Parse_Error (PARSE_WARNING, "Missing closing parenthesis for %s()",
+		     func);
+	return (0);
+    } else if (parens) {
+	/*
+	 * Advance pointer past close parenthesis.
+	 */
+	cp++;
+    }
+
+    *linePtr = cp;
+    return (argLen);
+}
+
+/*-
+ *-----------------------------------------------------------------------
+ * CondDoDefined --
+ *	Handle the 'defined' function for conditionals.
+ *
+ * Results:
+ *	TRUE if the given variable is defined.
+ *
+ * Side Effects:
+ *	None.
+ *
+ *-----------------------------------------------------------------------
+ */
+static Boolean
+CondDoDefined (argLen, arg)
+    int	    argLen;
+    char    *arg;
+{
+    char    savec = arg[argLen];
+    char    *p1;
+    Boolean result;
+
+    arg[argLen] = '\0';
+    if (Var_Value (arg, VAR_CMD, &p1) != (char *)NULL) {
+	result = TRUE;
+    } else {
+	result = FALSE;
+    }
+    if (p1)
+	free(p1);
+    arg[argLen] = savec;
+    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(string, pattern)
+    ClientData    string;
+    ClientData    pattern;
+{
+    return(!Str_Match((char *) string,(char *) pattern));
+}
+
+/*-
+ *-----------------------------------------------------------------------
+ * CondDoMake --
+ *	Handle the 'make' function for conditionals.
+ *
+ * Results:
+ *	TRUE if the given target is being made.
+ *
+ * Side Effects:
+ *	None.
+ *
+ *-----------------------------------------------------------------------
+ */
+static Boolean
+CondDoMake (argLen, arg)
+    int	    argLen;
+    char    *arg;
+{
+    char    savec = arg[argLen];
+    Boolean result;
+
+    arg[argLen] = '\0';
+    if (Lst_Find (create, (ClientData)arg, CondStrMatch) == NILLNODE) {
+	result = FALSE;
+    } else {
+	result = TRUE;
+    }
+    arg[argLen] = savec;
+    return (result);
+}
+
+/*-
+ *-----------------------------------------------------------------------
+ * 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 (argLen, arg)
+    int	    argLen;
+    char    *arg;
+{
+    char    savec = arg[argLen];
+    Boolean result;
+    char    *path;
+
+    arg[argLen] = '\0';
+    path = Dir_FindFile(arg, dirSearchPath);
+    if (path != (char *)NULL) {
+	result = TRUE;
+	free(path);
+    } else {
+	result = FALSE;
+    }
+    arg[argLen] = savec;
+    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 (argLen, arg)
+    int	    argLen;
+    char    *arg;
+{
+    char    savec = arg[argLen];
+    Boolean result;
+    GNode   *gn;
+
+    arg[argLen] = '\0';
+    gn = Targ_FindNode(arg, TARG_NOCREATE);
+    if ((gn != NILGNODE) && !OP_NOP(gn->type)) {
+	result = TRUE;
+    } else {
+	result = FALSE;
+    }
+    arg[argLen] = savec;
+    return (result);
+}
+
+/*-
+ *-----------------------------------------------------------------------
+ * 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 (argLen, arg)
+    int	    argLen;
+    char    *arg;
+{
+    char    savec = arg[argLen];
+    Boolean result;
+    GNode   *gn;
+
+    arg[argLen] = '\0';
+    gn = Targ_FindNode(arg, TARG_NOCREATE);
+    if ((gn != NILGNODE) && !OP_NOP(gn->type) && !Lst_IsEmpty(gn->commands)) {
+	result = TRUE;
+    } else {
+	result = FALSE;
+    }
+    arg[argLen] = savec;
+    return (result);
+}
+
+/*-
+ *-----------------------------------------------------------------------
+ * CondCvtArg --
+ *	Convert the given number into a double. If the number begins
+ *	with 0x, it is interpreted as a hexadecimal integer
+ *	and converted to a double from there. All other strings just have
+ *	strtod called on them.
+ *
+ * Results:
+ *	Sets 'value' to double value of string.
+ *	Returns true if the string was a valid number, false o.w.
+ *
+ * Side Effects:
+ *	Can change 'value' even if string is not a valid number.
+ *
+ *
+ *-----------------------------------------------------------------------
+ */
+static Boolean
+CondCvtArg(str, value)
+    register char    	*str;
+    double		*value;
+{
+    if ((*str == '0') && (str[1] == 'x')) {
+	register long i;
+
+	for (str += 2, i = 0; *str; str++) {
+	    int x;
+	    if (isdigit((unsigned char) *str))
+		x  = *str - '0';
+	    else if (isxdigit((unsigned char) *str))
+		x = 10 + *str - isupper((unsigned char) *str) ? 'A' : 'a';
+	    else
+		return FALSE;
+	    i = (i << 4) + x;
+	}
+	*value = (double) i;
+	return TRUE;
+    }
+    else {
+	char *eptr;
+	*value = strtod(str, &eptr);
+	return *eptr == '\0';
+    }
+}
+
+/*-
+ *-----------------------------------------------------------------------
+ * 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 None if it is used.
+ *
+ *-----------------------------------------------------------------------
+ */
+static Token
+CondToken(doEval)
+    Boolean doEval;
+{
+    Token	  t;
+
+    if (condPushBack == None) {
+	while (*condExpr == ' ' || *condExpr == '\t') {
+	    condExpr++;
+	}
+	switch (*condExpr) {
+	    case '(':
+		t = LParen;
+		condExpr++;
+		break;
+	    case ')':
+		t = RParen;
+		condExpr++;
+		break;
+	    case '|':
+		if (condExpr[1] == '|') {
+		    condExpr++;
+		}
+		condExpr++;
+		t = Or;
+		break;
+	    case '&':
+		if (condExpr[1] == '&') {
+		    condExpr++;
+		}
+		condExpr++;
+		t = And;
+		break;
+	    case '!':
+		t = Not;
+		condExpr++;
+		break;
+	    case '\n':
+	    case '\0':
+		t = EndOfFile;
+		break;
+	    case '$': {
+		char	*lhs;
+		char	*rhs;
+		char	*op;
+		int	varSpecLen;
+		Boolean	doFree;
+
+		/*
+		 * Parse the variable spec and skip over it, saving its
+		 * value in lhs.
+		 */
+		t = Err;
+		lhs = Var_Parse(condExpr, VAR_CMD, doEval,&varSpecLen,&doFree);
+		if (lhs == var_Error) {
+		    /*
+		     * Even if !doEval, we still report syntax errors, which
+		     * is what getting var_Error back with !doEval means.
+		     */
+		    return(Err);
+		}
+		condExpr += varSpecLen;
+
+		if (!isspace((unsigned char) *condExpr) &&
+		    strchr("!=><", *condExpr) == NULL) {
+		    Buffer buf;
+		    char *cp;
+
+		    buf = Buf_Init(0);
+
+		    for (cp = lhs; *cp; cp++)
+			Buf_AddByte(buf, (Byte)*cp);
+
+		    if (doFree)
+			free(lhs);
+
+		    for (;*condExpr && !isspace((unsigned char) *condExpr);
+			 condExpr++)
+			Buf_AddByte(buf, (Byte)*condExpr);
+
+		    Buf_AddByte(buf, (Byte)'\0');
+		    lhs = (char *)Buf_GetAll(buf, &varSpecLen);
+		    Buf_Destroy(buf, FALSE);
+
+		    doFree = TRUE;
+		}
+
+		/*
+		 * 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:
+			op = "!=";
+			rhs = "0";
+
+			goto do_compare;
+		}
+		while (isspace((unsigned char) *condExpr)) {
+		    condExpr++;
+		}
+		if (*condExpr == '\0') {
+		    Parse_Error(PARSE_WARNING,
+				"Missing right-hand-side of operator");
+		    goto error;
+		}
+		rhs = condExpr;
+do_compare:
+		if (*rhs == '"') {
+		    /*
+		     * Doing a string comparison. Only allow == and != for
+		     * operators.
+		     */
+		    char    *string;
+		    char    *cp, *cp2;
+		    int	    qt;
+		    Buffer  buf;
+
+do_string_compare:
+		    if (((*op != '!') && (*op != '=')) || (op[1] != '=')) {
+			Parse_Error(PARSE_WARNING,
+		"String comparison operator should be either == or !=");
+			goto error;
+		    }
+
+		    buf = Buf_Init(0);
+		    qt = *rhs == '"' ? 1 : 0;
+
+		    for (cp = &rhs[qt];
+			 ((qt && (*cp != '"')) ||
+			  (!qt && strchr(" \t)", *cp) == NULL)) &&
+			 (*cp != '\0'); cp++) {
+			if ((*cp == '\\') && (cp[1] != '\0')) {
+			    /*
+			     * Backslash escapes things -- skip over next
+			     * character, if it exists.
+			     */
+			    cp++;
+			    Buf_AddByte(buf, (Byte)*cp);
+			} else if (*cp == '$') {
+			    int	len;
+			    Boolean freeIt;
+
+			    cp2 = Var_Parse(cp, VAR_CMD, doEval,&len, &freeIt);
+			    if (cp2 != var_Error) {
+				Buf_AddBytes(buf, strlen(cp2), (Byte *)cp2);
+				if (freeIt) {
+				    free(cp2);
+				}
+				cp += len - 1;
+			    } else {
+				Buf_AddByte(buf, (Byte)*cp);
+			    }
+			} else {
+			    Buf_AddByte(buf, (Byte)*cp);
+			}
+		    }
+
+		    Buf_AddByte(buf, (Byte)0);
+
+		    string = (char *)Buf_GetAll(buf, (int *)0);
+		    Buf_Destroy(buf, FALSE);
+
+		    if (DEBUG(COND)) {
+			printf("lhs = \"%s\", rhs = \"%s\", op = %.2s\n",
+			       lhs, string, op);
+		    }
+		    /*
+		     * Null-terminate rhs and perform the comparison.
+		     * t is set to the result.
+		     */
+		    if (*op == '=') {
+			t = strcmp(lhs, string) ? False : True;
+		    } else {
+			t = strcmp(lhs, string) ? True : False;
+		    }
+		    free(string);
+		    if (rhs == condExpr) {
+		    	if (!qt && *cp == ')')
+			    condExpr = cp;
+			else
+			    condExpr = cp + 1;
+		    }
+		} else {
+		    /*
+		     * rhs is either a float or an integer. Convert both the
+		     * lhs and the rhs to a double and compare the two.
+		     */
+		    double  	left, right;
+		    char    	*string;
+
+		    if (!CondCvtArg(lhs, &left))
+			goto do_string_compare;
+		    if (*rhs == '$') {
+			int 	len;
+			Boolean	freeIt;
+
+			string = Var_Parse(rhs, VAR_CMD, doEval,&len,&freeIt);
+			if (string == var_Error) {
+			    right = 0.0;
+			} else {
+			    if (!CondCvtArg(string, &right)) {
+				if (freeIt)
+				    free(string);
+				goto do_string_compare;
+			    }
+			    if (freeIt)
+				free(string);
+			    if (rhs == condExpr)
+				condExpr += len;
+			}
+		    } else {
+			if (!CondCvtArg(rhs, &right))
+			    goto do_string_compare;
+			if (rhs == condExpr) {
+			    /*
+			     * Skip over the right-hand side
+			     */
+			    while(!isspace((unsigned char) *condExpr) &&
+				  (*condExpr != '\0')) {
+				condExpr++;
+			    }
+			}
+		    }
+
+		    if (DEBUG(COND)) {
+			printf("left = %f, right = %f, op = %.2s\n", left,
+			       right, op);
+		    }
+		    switch(op[0]) {
+		    case '!':
+			if (op[1] != '=') {
+			    Parse_Error(PARSE_WARNING,
+					"Unknown operator");
+			    goto error;
+			}
+			t = (left != right ? True : False);
+			break;
+		    case '=':
+			if (op[1] != '=') {
+			    Parse_Error(PARSE_WARNING,
+					"Unknown operator");
+			    goto error;
+			}
+			t = (left == right ? True : False);
+			break;
+		    case '<':
+			if (op[1] == '=') {
+			    t = (left <= right ? True : False);
+			} else {
+			    t = (left < right ? True : False);
+			}
+			break;
+		    case '>':
+			if (op[1] == '=') {
+			    t = (left >= right ? True : False);
+			} else {
+			    t = (left > right ? True : False);
+			}
+			break;
+		    }
+		}
+error:
+		if (doFree)
+		    free(lhs);
+		break;
+	    }
+	    default: {
+		Boolean (*evalProc) __P((int, char *));
+		Boolean invert = FALSE;
+		char	*arg;
+		int	arglen;
+
+		if (strncmp (condExpr, "defined", 7) == 0) {
+		    /*
+		     * Use CondDoDefined to evaluate the argument and
+		     * CondGetArg to extract the argument from the 'function
+		     * call'.
+		     */
+		    evalProc = CondDoDefined;
+		    condExpr += 7;
+		    arglen = CondGetArg (&condExpr, &arg, "defined", TRUE);
+		    if (arglen == 0) {
+			condExpr -= 7;
+			goto use_default;
+		    }
+		} else if (strncmp (condExpr, "make", 4) == 0) {
+		    /*
+		     * Use CondDoMake to evaluate the argument and
+		     * CondGetArg to extract the argument from the 'function
+		     * call'.
+		     */
+		    evalProc = CondDoMake;
+		    condExpr += 4;
+		    arglen = CondGetArg (&condExpr, &arg, "make", TRUE);
+		    if (arglen == 0) {
+			condExpr -= 4;
+			goto use_default;
+		    }
+		} else if (strncmp (condExpr, "exists", 6) == 0) {
+		    /*
+		     * Use CondDoExists to evaluate the argument and
+		     * CondGetArg to extract the argument from the
+		     * 'function call'.
+		     */
+		    evalProc = CondDoExists;
+		    condExpr += 6;
+		    arglen = CondGetArg(&condExpr, &arg, "exists", TRUE);
+		    if (arglen == 0) {
+			condExpr -= 6;
+			goto use_default;
+		    }
+		} else if (strncmp(condExpr, "empty", 5) == 0) {
+		    /*
+		     * Use Var_Parse to parse the spec in parens and return
+		     * True if the resulting string is empty.
+		     */
+		    int	    length;
+		    Boolean doFree;
+		    char    *val;
+
+		    condExpr += 5;
+
+		    for (arglen = 0;
+			 condExpr[arglen] != '(' && condExpr[arglen] != '\0';
+			 arglen += 1)
+			continue;
+
+		    if (condExpr[arglen] != '\0') {
+			val = Var_Parse(&condExpr[arglen - 1], VAR_CMD,
+					doEval, &length, &doFree);
+			if (val == var_Error) {
+			    t = Err;
+			} else {
+			    /*
+			     * A variable is empty when it just contains
+			     * spaces... 4/15/92, christos
+			     */
+			    char *p;
+			    for (p = val; *p && isspace((unsigned char)*p); p++)
+				continue;
+			    t = (*p == '\0') ? True : False;
+			}
+			if (doFree) {
+			    free(val);
+			}
+			/*
+			 * Advance condExpr to beyond the closing ). Note that
+			 * we subtract one from arglen + length b/c length
+			 * is calculated from condExpr[arglen - 1].
+			 */
+			condExpr += arglen + length - 1;
+		    } else {
+			condExpr -= 5;
+			goto use_default;
+		    }
+		    break;
+		} else if (strncmp (condExpr, "target", 6) == 0) {
+		    /*
+		     * Use CondDoTarget to evaluate the argument and
+		     * CondGetArg to extract the argument from the
+		     * 'function call'.
+		     */
+		    evalProc = CondDoTarget;
+		    condExpr += 6;
+		    arglen = CondGetArg(&condExpr, &arg, "target", TRUE);
+		    if (arglen == 0) {
+			condExpr -= 6;
+			goto use_default;
+		    }
+		} else if (strncmp (condExpr, "commands", 8) == 0) {
+		    /*
+		     * Use CondDoCommands to evaluate the argument and
+		     * CondGetArg to extract the argument from the
+		     * 'function call'.
+		     */
+		    evalProc = CondDoCommands;
+		    condExpr += 8;
+		    arglen = CondGetArg(&condExpr, &arg, "commands", TRUE);
+		    if (arglen == 0) {
+			condExpr -= 8;
+			goto use_default;
+		    }
+		} else {
+		    /*
+		     * The symbol is itself the argument to the default
+		     * function. We advance condExpr to the end of the symbol
+		     * by hand (the next whitespace, closing paren or
+		     * binary operator) and set to invert the evaluation
+		     * function if condInvert is TRUE.
+		     */
+		use_default:
+		    invert = condInvert;
+		    evalProc = condDefProc;
+		    arglen = CondGetArg(&condExpr, &arg, "", FALSE);
+		}
+
+		/*
+		 * Evaluate the argument using the set function. If invert
+		 * is TRUE, we invert the sense of the function.
+		 */
+		t = (!doEval || (* evalProc) (arglen, arg) ?
+		     (invert ? False : True) :
+		     (invert ? True : False));
+		free(arg);
+		break;
+	    }
+	}
+    } else {
+	t = condPushBack;
+	condPushBack = None;
+    }
+    return (t);
+}
+
+/*-
+ *-----------------------------------------------------------------------
+ * CondT --
+ *	Parse a single term in the expression. This consists of a terminal
+ *	symbol or Not and a terminal symbol (not including the binary
+ *	operators):
+ *	    T -> defined(variable) | make(target) | exists(file) | symbol
+ *	    T -> ! T | ( E )
+ *
+ * Results:
+ *	True, False or Err.
+ *
+ * Side Effects:
+ *	Tokens are consumed.
+ *
+ *-----------------------------------------------------------------------
+ */
+static Token
+CondT(doEval)
+    Boolean doEval;
+{
+    Token   t;
+
+    t = CondToken(doEval);
+
+    if (t == EndOfFile) {
+	/*
+	 * If we reached the end of the expression, the expression
+	 * is malformed...
+	 */
+	t = Err;
+    } else if (t == LParen) {
+	/*
+	 * T -> ( E )
+	 */
+	t = CondE(doEval);
+	if (t != Err) {
+	    if (CondToken(doEval) != RParen) {
+		t = Err;
+	    }
+	}
+    } else if (t == Not) {
+	t = CondT(doEval);
+	if (t == True) {
+	    t = False;
+	} else if (t == False) {
+	    t = True;
+	}
+    }
+    return (t);
+}
+
+/*-
+ *-----------------------------------------------------------------------
+ * CondF --
+ *	Parse a conjunctive factor (nice name, wot?)
+ *	    F -> T && F | T
+ *
+ * Results:
+ *	True, False or Err
+ *
+ * Side Effects:
+ *	Tokens are consumed.
+ *
+ *-----------------------------------------------------------------------
+ */
+static Token
+CondF(doEval)
+    Boolean doEval;
+{
+    Token   l, o;
+
+    l = CondT(doEval);
+    if (l != Err) {
+	o = CondToken(doEval);
+
+	if (o == And) {
+	    /*
+	     * F -> T && F
+	     *
+	     * If T is False, the whole thing will be False, but we have to
+	     * parse the r.h.s. anyway (to throw it away).
+	     * If T is True, the result is the r.h.s., be it an Err or no.
+	     */
+	    if (l == True) {
+		l = CondF(doEval);
+	    } else {
+		(void) CondF(FALSE);
+	    }
+	} else {
+	    /*
+	     * F -> T
+	     */
+	    CondPushBack (o);
+	}
+    }
+    return (l);
+}
+
+/*-
+ *-----------------------------------------------------------------------
+ * CondE --
+ *	Main expression production.
+ *	    E -> F || E | F
+ *
+ * Results:
+ *	True, False or Err.
+ *
+ * Side Effects:
+ *	Tokens are, of course, consumed.
+ *
+ *-----------------------------------------------------------------------
+ */
+static Token
+CondE(doEval)
+    Boolean doEval;
+{
+    Token   l, o;
+
+    l = CondF(doEval);
+    if (l != Err) {
+	o = CondToken(doEval);
+
+	if (o == Or) {
+	    /*
+	     * E -> F || E
+	     *
+	     * A similar thing occurs for ||, except that here we make sure
+	     * the l.h.s. is False before we bother to evaluate the r.h.s.
+	     * Once again, if l is False, the result is the r.h.s. and once
+	     * again if l is True, we parse the r.h.s. to throw it away.
+	     */
+	    if (l == 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(dosetup, line, value, eprint)
+    int dosetup;
+    char *line;
+    Boolean *value;
+    int eprint;
+{
+    if (dosetup) {
+	condDefProc = CondDoDefined;
+	condInvert = 0;
+    }
+
+    while (*line == ' ' || *line == '\t')
+	line++;
+
+    condExpr = line;
+    condPushBack = None;
+
+    switch (CondE(TRUE)) {
+    case True:
+	if (CondToken(TRUE) == EndOfFile) {
+	    *value = TRUE;
+	    break;
+	}
+	goto err;
+	/*FALLTHRU*/
+    case False:
+	if (CondToken(TRUE) == EndOfFile) {
+	    *value = FALSE;
+	    break;
+	}
+	/*FALLTHRU*/
+    case Err:
+err:
+	if (eprint)
+	    Parse_Error (PARSE_FATAL, "Malformed conditional (%s)",
+			 line);
+	return (COND_INVALID);
+    default:
+	break;
+    }
+
+    return COND_PARSE;
+}
+
+
+/*-
+ *-----------------------------------------------------------------------
+ * 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.
+ *
+ * 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.
+ *
+ *-----------------------------------------------------------------------
+ */
+int
+Cond_Eval (line)
+    char    	    *line;    /* Line to parse */
+{
+    struct If	    *ifp;
+    Boolean 	    isElse;
+    Boolean 	    value = FALSE;
+    int	    	    level;  	/* Level at which to report errors. */
+
+    level = PARSE_FATAL;
+
+    for (line++; *line == ' ' || *line == '\t'; line++) {
+	continue;
+    }
+
+    /*
+     * Find what type of if we're dealing with. The result is left
+     * in ifp and isElse is set TRUE if it's an elif line.
+     */
+    if (line[0] == 'e' && line[1] == 'l') {
+	line += 2;
+	isElse = TRUE;
+    } else if (strncmp (line, "endif", 5) == 0) {
+	/*
+	 * End of a conditional section. If skipIfLevel is non-zero, that
+	 * conditional was skipped, so lines following it should also be
+	 * skipped. Hence, we return COND_SKIP. Otherwise, the conditional
+	 * was read so succeeding lines should be parsed (think about it...)
+	 * so we return COND_PARSE, unless this endif isn't paired with
+	 * a decent if.
+	 */
+	if (skipIfLevel != 0) {
+	    skipIfLevel -= 1;
+	    return (COND_SKIP);
+	} else {
+	    if (condTop == MAXIF) {
+		Parse_Error (level, "if-less endif");
+		return (COND_INVALID);
+	    } else {
+		skipLine = FALSE;
+		condTop += 1;
+		return (COND_PARSE);
+	    }
+	}
+    } else {
+	isElse = FALSE;
+    }
+
+    /*
+     * Figure out what sort of conditional it is -- what its default
+     * function is, etc. -- by looking in the table of valid "ifs"
+     */
+    for (ifp = ifs; ifp->form != (char *)0; ifp++) {
+	if (strncmp (ifp->form, line, ifp->formlen) == 0) {
+	    break;
+	}
+    }
+
+    if (ifp->form == (char *) 0) {
+	/*
+	 * Nothing fit. If the first word on the line is actually
+	 * "else", it's a valid conditional whose value is the inverse
+	 * of the previous if we parsed.
+	 */
+	if (isElse && (line[0] == 's') && (line[1] == 'e')) {
+	    if (condTop == MAXIF) {
+		Parse_Error (level, "if-less else");
+		return (COND_INVALID);
+	    } else if (skipIfLevel == 0) {
+		value = !condStack[condTop];
+	    } else {
+		return (COND_SKIP);
+	    }
+	} else {
+	    /*
+	     * Not a valid conditional type. No error...
+	     */
+	    return (COND_INVALID);
+	}
+    } else {
+	if (isElse) {
+	    if (condTop == MAXIF) {
+		Parse_Error (level, "if-less elif");
+		return (COND_INVALID);
+	    } else if (skipIfLevel != 0) {
+		/*
+		 * If skipping this conditional, just ignore the whole thing.
+		 * If we don't, the user might be employing a variable that's
+		 * undefined, for which there's an enclosing ifdef that
+		 * we're skipping...
+		 */
+		return(COND_SKIP);
+	    }
+	} else if (skipLine) {
+	    /*
+	     * Don't even try to evaluate a conditional that's not an else if
+	     * we're skipping things...
+	     */
+	    skipIfLevel += 1;
+	    return(COND_SKIP);
+	}
+
+	/*
+	 * Initialize file-global variables for parsing
+	 */
+	condDefProc = ifp->defProc;
+	condInvert = ifp->doNot;
+
+	line += ifp->formlen;
+	if (Cond_EvalExpression(0, line, &value, 1) == COND_INVALID)
+		return COND_INVALID;
+    }
+    if (!isElse) {
+	condTop -= 1;
+    } else if ((skipIfLevel != 0) || condStack[condTop]) {
+	/*
+	 * If this is an else-type conditional, it should only take effect
+	 * if its corresponding if was evaluated and FALSE. If its if was
+	 * TRUE or skipped, we return COND_SKIP (and start skipping in case
+	 * we weren't already), leaving the stack unmolested so later elif's
+	 * don't screw up...
+	 */
+	skipLine = TRUE;
+	return (COND_SKIP);
+    }
+
+    if (condTop < 0) {
+	/*
+	 * This is the one case where we can definitely proclaim a fatal
+	 * error. If we don't, we're hosed.
+	 */
+	Parse_Error (PARSE_FATAL, "Too many nested if's. %d max.", MAXIF);
+	return (COND_INVALID);
+    } else {
+	condStack[condTop] = value;
+	skipLine = !value;
+	return (value ? COND_PARSE : COND_SKIP);
+    }
+}
+
+
+
+/*-
+ *-----------------------------------------------------------------------
+ * 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_End()
+{
+    if (condTop != MAXIF) {
+	Parse_Error(PARSE_FATAL, "%d open conditional%s", MAXIF-condTop,
+		    MAXIF-condTop == 1 ? "" : "s");
+    }
+    condTop = MAXIF;
+}