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Synch with my current work.
Numerous changes:
- generate can build several tables
- style cleanup
- statistics code
- use variable names throughout (struct Name)
- recursive variables everywhere
- faster parser (pass buffer along instead of allocating multiple copies)
- correct parser. Handles comments everywhere, and ; correctly
- more string intervals
- simplified dir.c, less recursion.
- extended for loops
- sinclude()
- finished removing extra junk from Lst_*
- handles ${@D} and friends in a simpler way
- cleaned up and modular VarModifiers handling.
- recognizes some gnu Makefile usages and errors out about them.

Additionally, some extra functionality is defined by FEATURES. The set of
functionalities is currently hardcoded to OpenBSD defaults, but this may
include support for some NetBSD extensions, like ODE modifiers.

Backed by miod@ and millert@, who finally got sick of my endless patches...

/*	$OpenPackages$ */
/*	$OpenBSD: util.c,v 1.14 2001/05/03 13:41:12 espie Exp $	*/
/*	$NetBSD: util.c,v 1.10 1996/12/31 17:56:04 christos Exp $	*/

/*
 * Missing stuff from OS's
 */

#ifndef lint
static char rcsid[] = "$OpenBSD: util.c,v 1.14 2001/05/03 13:41:12 espie Exp $";
#endif

#include <stdio.h>
#include "make.h"
#include <sys/param.h>

#ifndef __STDC__
# ifndef const
#  define const
# endif
#endif

#ifdef sun



extern int errno, sys_nerr;
extern char *sys_errlist[];

char *
strerror(e)
    int e;
{
    static char buf[100];
    if (e < 0 || e >= sys_nerr) {
	sprintf(buf, "Unknown error %d", e);
	return buf;
    }
    else
	return sys_errlist[e];
}
#endif

#ifdef ultrix
#include <string.h>

/* strdup
 *
 * Make a duplicate of a string.
 * For systems which lack this function.
 */
char *
strdup(str)
    const char *str;
{
    size_t len;
    char *p;

    if (str == NULL)
	return NULL;
    len = strlen(str) + 1;
    if ((p = malloc(len)) == NULL)
	return NULL;

    return memcpy(p, str, len);
}

#endif

#if defined(sun) || defined(__hpux) || defined(__sgi)

int
setenv(name, value, dum)
    const char *name;
    const char *value;
    int dum;
{
    char *p;
    int len = strlen(name) + strlen(value) + 2; /* = \0 */
    char *ptr = (char*)malloc(len);

    if (ptr == NULL)
	return -1;

    p = ptr;

    while (*name)
	*p++ = *name++;

    *p++ = '=';

    while (*value)
	*p++ = *value++;

    *p = '\0';

    len = putenv(ptr);
/*    free(ptr); */
    return len;
}
#endif

#ifdef __hpux
#include <sys/types.h>
#include <sys/param.h>
#include <sys/syscall.h>
#include <sys/signal.h>
#include <sys/stat.h>
#include <stdio.h>
#include <dirent.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>


int
killpg(pid, sig)
    int pid, sig;
{
    return kill(-pid, sig);
}

void
srandom(seed)
    long seed;
{
    srand48(seed);
}

long
random()
{
    return lrand48();
}

/* turn into bsd signals */
void (*
signal(s, a))()
    int     s;
    void (*a)();
{
    struct sigvec osv, sv;

    (void)sigvector(s, (struct sigvec *)0, &osv);
    sv = osv;
    sv.sv_handler = a;
#ifdef SV_BSDSIG
    sv.sv_flags = SV_BSDSIG;
#endif

    if (sigvector(s, &sv, (struct sigvec *)0) == -1)
	return SIG_ERR;
    return osv.sv_handler;
}

#if !defined(BSD) && !defined(d_fileno)
# define d_fileno d_ino
#endif

#ifndef DEV_DEV_COMPARE
# define DEV_DEV_COMPARE(a, b) ((a) == (b))
#endif
#define ISDOT(c) ((c)[0] == '.' && ((c)[1] == '\0' || (c)[1] == '/'))
#define ISDOTDOT(c) ((c)[0] == '.' && ISDOT(&((c)[1])))


/* strrcpy():
 *	Like strcpy, going backwards and returning the new pointer
 */
static char *
strrcpy(ptr, str)
    char *ptr, *str;
{
    size_t len = strlen(str);

    while (len)
	*--ptr = str[--len];

    return ptr;
} /* end strrcpy */


char   *
getwd(pathname)
    char   *pathname;
{
    DIR    *dp;
    struct dirent *d;
    extern int errno;

    struct stat st_root, st_cur, st_next, st_dotdot;
    char    pathbuf[MAXPATHLEN], nextpathbuf[MAXPATHLEN * 2];
    char   *pathptr, *nextpathptr, *cur_name_add;

    /* find the inode of root */
    if (stat("/", &st_root) == -1) {
	(void)sprintf(pathname,
			"getwd: Cannot stat \"/\" (%s)", strerror(errno));
	return NULL;
    }
    pathbuf[MAXPATHLEN - 1] = '\0';
    pathptr = &pathbuf[MAXPATHLEN - 1];
    nextpathbuf[MAXPATHLEN - 1] = '\0';
    cur_name_add = nextpathptr = &nextpathbuf[MAXPATHLEN - 1];

    /* find the inode of the current directory */
    if (lstat(".", &st_cur) == -1) {
	(void)sprintf(pathname,
			"getwd: Cannot stat \".\" (%s)", strerror(errno));
	return NULL;
    }
    nextpathptr = strrcpy(nextpathptr, "../");

    /* Descend to root */
    for (;;) {

	/* look if we found root yet */
	if (st_cur.st_ino == st_root.st_ino &&
	    DEV_DEV_COMPARE(st_cur.st_dev, st_root.st_dev)) {
	    (void)strcpy(pathname, *pathptr != '/' ? "/" : pathptr);
	    return pathname;
	}

	/* open the parent directory */
	if (stat(nextpathptr, &st_dotdot) == -1) {
	    (void)sprintf(pathname,
			    "getwd: Cannot stat directory \"%s\" (%s)",
			    nextpathptr, strerror(errno));
	    return NULL;
	}
	if ((dp = opendir(nextpathptr)) == NULL) {
	    (void)sprintf(pathname,
			    "getwd: Cannot open directory \"%s\" (%s)",
			    nextpathptr, strerror(errno));
	    return NULL;
	}

	/* look in the parent for the entry with the same inode */
	if (DEV_DEV_COMPARE(st_dotdot.st_dev, st_cur.st_dev)) {
	    /* Parent has same device. No need to stat every member */
	    for (d = readdir(dp); d != NULL; d = readdir(dp))
		if (d->d_fileno == st_cur.st_ino)
		    break;
	}
	else {
	    /*
	     * Parent has a different device. This is a mount point so we
	     * need to stat every member
	     */
	    for (d = readdir(dp); d != NULL; d = readdir(dp)) {
		if (ISDOT(d->d_name) || ISDOTDOT(d->d_name))
		    continue;
		(void)strcpy(cur_name_add, d->d_name);
		if (lstat(nextpathptr, &st_next) == -1) {
		    (void)sprintf(pathname, "getwd: Cannot stat \"%s\" (%s)",
				    d->d_name, strerror(errno));
		    (void)closedir(dp);
		    return NULL;
		}
		/* check if we found it yet */
		if (st_next.st_ino == st_cur.st_ino &&
		    DEV_DEV_COMPARE(st_next.st_dev, st_cur.st_dev))
		    break;
	    }
	}
	if (d == NULL) {
	    (void)sprintf(pathname, "getwd: Cannot find \".\" in \"..\"");
	    (void)closedir(dp);
	    return NULL;
	}
	st_cur = st_dotdot;
	pathptr = strrcpy(pathptr, d->d_name);
	pathptr = strrcpy(pathptr, "/");
	nextpathptr = strrcpy(nextpathptr, "../");
	(void)closedir(dp);
	*cur_name_add = '\0';
    }
} /* end getwd */


char	*sys_siglist[] = {
	"Signal 0",
	"Hangup",			/* SIGHUP    */
	"Interrupt",			/* SIGINT    */
	"Quit", 			/* SIGQUIT   */
	"Illegal instruction",		/* SIGILL    */
	"Trace/BPT trap",		/* SIGTRAP   */
	"IOT trap",			/* SIGIOT    */
	"EMT trap",			/* SIGEMT    */
	"Floating point exception",	/* SIGFPE    */
	"Killed",			/* SIGKILL   */
	"Bus error",			/* SIGBUS    */
	"Segmentation fault",		/* SIGSEGV   */
	"Bad system call",		/* SIGSYS    */
	"Broken pipe",			/* SIGPIPE   */
	"Alarm clock",			/* SIGALRM   */
	"Terminated",			/* SIGTERM   */
	"User defined signal 1",	/* SIGUSR1   */
	"User defined signal 2",	/* SIGUSR2   */
	"Child exited", 		/* SIGCLD    */
	"Power-fail restart",		/* SIGPWR    */
	"Virtual timer expired",	/* SIGVTALRM */
	"Profiling timer expired",	/* SIGPROF   */
	"I/O possible", 		/* SIGIO     */
	"Window size changes",		/* SIGWINDOW */
	"Stopped (signal)",		/* SIGSTOP   */
	"Stopped",			/* SIGTSTP   */
	"Continued",			/* SIGCONT   */
	"Stopped (tty input)",		/* SIGTTIN   */
	"Stopped (tty output)", 	/* SIGTTOU   */
	"Urgent I/O condition", 	/* SIGURG    */
	"Remote lock lost (NFS)",	/* SIGLOST   */
	"Signal 31",			/* reserved  */
	"DIL signal"			/* SIGDIL    */
};

int
utimes(file, tvp)
    char *file;
    struct timeval tvp[2];
{
    struct utimbuf t;

    t.actime  = tvp[0].tv_sec;
    t.modtime = tvp[1].tv_sec;
    return utime(file, &t);
}


#endif /* __hpux */

#if defined(sun) && defined(__svr4__)
#include <signal.h>

/* turn into bsd signals */
void (*
signal(s, a))()
    int     s;
    void (*a)();
{
    struct sigaction sa, osa;

    memset(&sa, 0, sizeof sa);
    sa.sa_handler = a;
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = SA_RESTART;

    if (sigaction(s, &sa, &osa) == -1)
	return SIG_ERR;
    else
	return osa.sa_handler;
}

#endif

#ifndef BSD4_4
#ifdef __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#ifdef _IOSTRG
#define STRFLAG (_IOSTRG|_IOWRT)	/* no _IOWRT: avoid stdio bug */
#else
#define STRFLAG (_IOREAD)		/* XXX: Assume svr4 stdio */
#endif

int
vsnprintf(s, n, fmt, args)
	char *s;
	size_t n;
	const char *fmt;
	va_list args;
{
	FILE fakebuf;

	fakebuf._flag = STRFLAG;
	/*
	 * Some os's are char * _ptr, others are unsigned char *_ptr...
	 * We cast to void * to make everyone happy.
	 */
	fakebuf._ptr = (void *)s;
	fakebuf._cnt = n-1;
	fakebuf._file = -1;
	_doprnt(fmt, args, &fakebuf);
	fakebuf._cnt++;
	putc('\0', &fakebuf);
	if (fakebuf._cnt<0)
	    fakebuf._cnt = 0;
	return n-fakebuf._cnt-1;
}

int
#ifdef __STDC__
snprintf(char *s, size_t n, const char *fmt, ...)
#else
snprintf(va_alist)
	va_dcl
#endif
{
	va_list ap;
	int rv;
#ifdef __STDC__
	va_start(ap, fmt);
#else
	char *s;
	size_t n;
	const char *fmt;

	va_start(ap);

	s = va_arg(ap, char *);
	n = va_arg(ap, size_t);
	fmt = va_arg(ap, const char *);
#endif
	rv = vsnprintf(s, n, fmt, ap);
	va_end(ap);
	return rv;
}
#endif
#ifdef NEED_STRSTR
char *
strstr(string, substring)
	const char *string;		/* String to search. */
	const char *substring;		/* Substring to find in string */
{
	const char *a, *b;

	/*
	 * First scan quickly through the two strings looking for a single-
	 * character match.  When it's found, then compare the rest of the
	 * substring.
	 */

	for (b = substring; *string != 0; string += 1) {
		if (*string != *b)
			continue;
		a = string;
		for (;;) {
			if (*b == 0)
				return (char *)string;
			if (*a++ != *b++)
				break;
		}
		b = substring;
	}
	return NULL;
}
#endif

#ifdef NEED_FGETLN
char *
fgetln(stream, len)
    FILE *stream;
    size_t *len;
{
    static char *buffer = NULL;
    static size_t buflen = 0;

    if (buflen == 0) {
	buflen = 512;
	buffer = emalloc(buflen+1);
    }
    if (fgets(buffer, buflen+1, stream) == NULL)
	return NULL;
    *len = strlen(buffer);
    while (*len == buflen && buffer[*len-1] != '\n') {
	buffer = erealloc(buffer, 2*buflen + 1);
	if (fgets(buffer + buflen, buflen + 1, stream) == NULL)
	    return NULL;
	*len += strlen(buffer + buflen);
	buflen *= 2;
    }
    return buffer;
}
#endif