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/*
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 * compat.c - compatibility routines for the deprived
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 *
 * This file is part of zsh, the Z shell.
 *
 * Copyright (c) 1992-1997 Paul Falstad
 * All rights reserved.
 *
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and to distribute modified versions of this software for any
 * purpose, provided that the above copyright notice and the following
 * two paragraphs appear in all copies of this software.
 *
 * In no event shall Paul Falstad or the Zsh Development Group be liable
 * to any party for direct, indirect, special, incidental, or consequential
 * damages arising out of the use of this software and its documentation,
 * even if Paul Falstad and the Zsh Development Group have been advised of
 * the possibility of such damage.
 *
 * Paul Falstad and the Zsh Development Group specifically disclaim any
 * warranties, including, but not limited to, the implied warranties of
 * merchantability and fitness for a particular purpose.  The software
 * provided hereunder is on an "as is" basis, and Paul Falstad and the
 * Zsh Development Group have no obligation to provide maintenance,
 * support, updates, enhancements, or modifications.
 *
 */

#include "zsh.mdh"
#include "compat.pro"

/* Return pointer to first occurence of string t *
 * in string s.  Return NULL if not present.     */

#ifndef HAVE_STRSTR
char *
strstr(const char *s, const char *t)
{
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    const char *p1, *p2;
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    for (; *s; s++) {
        for (p1 = s, p2 = t; *p2; p1++, p2++)
            if (*p1 != *p2)
                break;
        if (!*p2)
            return (char *)s;
    }
    return NULL;
}
#endif


#ifndef HAVE_GETHOSTNAME
int
gethostname(char *name, size_t namelen)
{
    struct utsname uts;

    uname(&uts);
    if(strlen(uts.nodename) >= namelen) {
	errno = EINVAL;
	return -1;
    }
    strcpy(name, uts.nodename);
    return 0;
}
#endif


#ifndef HAVE_GETTIMEOFDAY
int
gettimeofday(struct timeval *tv, struct timezone *tz)
{
    tv->tv_usec = 0;
    tv->tv_sec = (long)time((time_t) 0);
    return 0;
}
#endif


/* compute the difference between two calendar times */

#ifndef HAVE_DIFFTIME
double
difftime(time_t t2, time_t t1)
{
    return ((double)t2 - (double)t1);
}
#endif


#ifndef HAVE_STRERROR
extern char *sys_errlist[];

/* Get error message string associated with a particular  *
 * error number, and returns a pointer to that string.    *
 * This is not a particularly robust version of strerror. */

char *
strerror(int errnum)
{
    return (sys_errlist[errnum]);
}
#endif


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#if 0
/* pathconf(_PC_PATH_MAX) is not currently useful to zsh.  The value *
 * returned varies depending on a number of factors, e.g. the amount *
 * of memory available to the operating system at a given time; thus *
 * it can't be used for buffer allocation, or even as an indication  *
 * of whether an attempt to use or create a given pathname may fail  *
 * at any future time.                                               *
 *                                                                   *
 * The call is also permitted to fail if the argument path is not an *
 * existing directory, so even to make sense of that one must search *
 * for a valid directory somewhere in the path and adjust.  Even if  *
 * it succeeds, the return value is relative to the input directory, *
 * and therefore potentially relative to the length of the shortest  *
 * path either to that directory or to our working directory.        *
 *                                                                   *
 * Finally, see the note below for glibc; detection of pathconf() is *
 * not by itself an indication that it works reliably.               */
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/* The documentation for pathconf() says something like:             *
 *     The limit is returned, if one exists.  If the system  does    *
 *     not  have  a  limit  for  the  requested  resource,  -1 is    *
 *     returned, and errno is unchanged.  If there is  an  error,    *
 *     -1  is returned, and errno is set to reflect the nature of    *
 *     the error.                                                    *
 *                                                                   *
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 * System calls are not permitted to set errno to 0; but we must (or *
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 * some other flag value) in order to determine that the resource is *
 * unlimited.  What use is leaving errno unchanged?  Instead, define *
 * a wrapper that resets errno to 0 and returns 0 for "the system    *
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 * does not have a limit," so that -1 always means a real error.     */
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/**/
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mod_export long
zpathmax(char *dir)
{
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#ifdef HAVE_PATHCONF
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    long pathmax;
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    errno = 0;
    if ((pathmax = pathconf(dir, _PC_PATH_MAX)) >= 0) {
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	/* Some versions of glibc pathconf return a hardwired value! */
	return pathmax;
    } else if (errno == EINVAL || errno == ENOENT || errno == ENOTDIR) {
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	/* Work backward to find a directory, until we run out of path. */
	char *tail = strrchr(dir, '/');
	while (tail > dir && tail[-1] == '/')
	    --tail;
	if (tail > dir) {
	    *tail = 0;
	    pathmax = zpathmax(dir);
	    *tail = '/';
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	} else {
	    errno = 0;
	    if (tail)
		pathmax = pathconf("/", _PC_PATH_MAX);
	    else
		pathmax = pathconf(".", _PC_PATH_MAX);
	}
	if (pathmax > 0) {
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	    long taillen = (tail ? strlen(tail) : (strlen(dir) + 1));
	    if (taillen < pathmax)
		return pathmax - taillen;
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	    else
		errno = ENAMETOOLONG;
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	}
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    }
    if (errno)
	return -1;
    else
	return 0; /* pathmax should be considered unlimited */
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#else
    long dirlen = strlen(dir);

    /* The following is wrong if dir is not an absolute path. */
    return ((long) ((dirlen >= PATH_MAX) ?
		    ((errno = ENAMETOOLONG), -1) :
		    ((errno = 0), PATH_MAX - dirlen)));
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#endif
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}
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#endif /* 0 */
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#ifdef HAVE_SYSCONF
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/*
 * This is replaced by a macro from system.h if not HAVE_SYSCONF.
 * 0 is returned by sysconf if _SC_OPEN_MAX is unavailable;
 * -1 is returned on error
 *
 * Neither of these should happen, but resort to OPEN_MAX rather
 * than return 0 or -1 just in case.
 *
 * We'll limit the open maximum to ZSH_INITIAL_OPEN_MAX to
 * avoid probing ridiculous numbers of file descriptors.
 */
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/**/
mod_export long
zopenmax(void)
{
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    long openmax;

    if ((openmax = sysconf(_SC_OPEN_MAX)) < 1) {
	openmax = OPEN_MAX;
    } else if (openmax > OPEN_MAX) {
	/* On some systems, "limit descriptors unlimited" or the  *
	 * equivalent will set openmax to a huge number.  Unless  *
	 * there actually is a file descriptor > OPEN_MAX already *
	 * open, nothing in zsh requires the true maximum, and in *
	 * fact it causes inefficiency elsewhere if we report it. *
	 * So, report the maximum of OPEN_MAX or the largest open *
	 * descriptor (is there a better way to find that?).      */
	long i, j = OPEN_MAX;
	if (openmax > ZSH_INITIAL_OPEN_MAX)
	    openmax = ZSH_INITIAL_OPEN_MAX;
	for (i = j; i < openmax; i += (errno != EINTR)) {
	    errno = 0;
	    if (fcntl(i, F_GETFL, 0) < 0 &&
		(errno == EBADF || errno == EINTR))
		continue;
	    j = i;
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	}
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	openmax = j;
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    }

    return (max_zsh_fd > openmax) ? max_zsh_fd : openmax;
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}
#endif
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/*
 * Rationalise the current directory, returning the string.
 *
 * If "d" is not NULL, it is used to store information about the
 * directory.  The returned name is also present in d->dirname and is in
 * permanently allocated memory.  The handling of this case depends on
 * whether the fchdir() system call is available; if it is, it is assumed
 * the caller is able to restore the current directory.  On successfully
 * identifying the directory the function returns immediately rather
 * than ascending the hierarchy.
 *
 * If "d" is NULL, no assumption about the caller's behaviour is
 * made.  The returned string is in heap memory.  This case is
 * always handled by changing directory up the hierarchy.
 *
 * On Cygwin or other systems where USE_GETCWD is defined (at the
 * time of writing only QNX), we skip all the above and use the
 * getcwd() system call.
 */

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/**/
mod_export char *
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zgetdir(struct dirsav *d)
{
    char nbuf[PATH_MAX+3];
    char *buf;
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    int bufsiz, pos;
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    struct stat sbuf;
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    ino_t pino;
    dev_t pdev;
#if !defined(__CYGWIN__) && !defined(USE_GETCWD)
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    struct dirent *de;
    DIR *dir;
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    dev_t dev;
    ino_t ino;
    int len;
#endif
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    buf = zhalloc(bufsiz = PATH_MAX);
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    pos = bufsiz - 1;
    buf[pos] = '\0';
    strcpy(nbuf, "../");
    if (stat(".", &sbuf) < 0) {
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	return NULL;
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    }

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    /* Record the initial inode and device */
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    pino = sbuf.st_ino;
    pdev = sbuf.st_dev;
    if (d)
	d->ino = pino, d->dev = pdev;
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#if !defined(__CYGWIN__) && !defined(USE_GETCWD)
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#ifdef HAVE_FCHDIR
    else
#endif
	holdintr();

    for (;;) {
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	/* Examine the parent of the current directory. */
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	if (stat("..", &sbuf) < 0)
	    break;

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	/* Inode and device of curtent directory */
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	ino = pino;
	dev = pdev;
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	/* Inode and device of current directory's parent */
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	pino = sbuf.st_ino;
	pdev = sbuf.st_dev;

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	/* If they're the same, we've reached the root directory. */
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	if (ino == pino && dev == pdev) {
	    if (!buf[pos])
		buf[--pos] = '/';
	    if (d) {
#ifndef HAVE_FCHDIR
		zchdir(buf + pos);
		noholdintr();
#endif
		return d->dirname = ztrdup(buf + pos);
	    }
	    zchdir(buf + pos);
	    noholdintr();
	    return buf + pos;
	}

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	/* Search the parent for the current directory. */
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	if (!(dir = opendir("..")))
	    break;

	while ((de = readdir(dir))) {
	    char *fn = de->d_name;
	    /* Ignore `.' and `..'. */
	    if (fn[0] == '.' &&
		(fn[1] == '\0' ||
		 (fn[1] == '.' && fn[2] == '\0')))
		continue;
#ifdef HAVE_STRUCT_DIRENT_D_STAT
	    if(de->d_stat.st_dev == dev && de->d_stat.st_ino == ino) {
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		/* Found the directory we're currently in */
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		strncpy(nbuf + 3, fn, PATH_MAX);
		break;
	    }
#else /* !HAVE_STRUCT_DIRENT_D_STAT */
# ifdef HAVE_STRUCT_DIRENT_D_INO
	    if (dev != pdev || (ino_t) de->d_ino == ino)
# endif /* HAVE_STRUCT_DIRENT_D_INO */
	    {
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		/* Maybe found directory, need to check device & inode */
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		strncpy(nbuf + 3, fn, PATH_MAX);
		lstat(nbuf, &sbuf);
		if (sbuf.st_dev == dev && sbuf.st_ino == ino)
		    break;
	    }
#endif /* !HAVE_STRUCT_DIRENT_D_STAT */
	}
	closedir(dir);
	if (!de)
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	    break;		/* Not found */
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	/*
	 * We get the "/" free just by copying from nbuf+2 instead
	 * of nbuf+3, which is where we copied the path component.
	 * This means buf[pos] is always a "/".
	 */
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	len = strlen(nbuf + 2);
	pos -= len;
	while (pos <= 1) {
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	    char *newbuf = zhalloc(2*bufsiz);
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	    memcpy(newbuf + bufsiz, buf, bufsiz);
	    buf = newbuf;
	    pos += bufsiz;
	    bufsiz *= 2;
	}
	memcpy(buf + pos, nbuf + 2, len);
#ifdef HAVE_FCHDIR
	if (d)
	    return d->dirname = ztrdup(buf + pos + 1);
#endif
	if (chdir(".."))
	    break;
    }
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    /*
     * Fix up the directory, if necessary.
     * We're changing back down the hierarchy, ignore the
     * "/" at buf[pos].
     */
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    if (d) {
#ifndef HAVE_FCHDIR
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	if (buf[pos])
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	    zchdir(buf + pos + 1);
	noholdintr();
#endif
	return NULL;
    }
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    if (buf[pos])
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	zchdir(buf + pos + 1);
    noholdintr();
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#else  /* __CYGWIN__, USE_GETCWD cases */

    if (!getcwd(buf, bufsiz)) {
	if (d) {
	    return NULL;
	}
    } else {
	if (d) {
	    return d->dirname = ztrdup(buf);
	}
	return buf;
    }
#endif

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    /*
     * Something bad happened.
     * This has been seen when inside a special directory,
     * such as the Netapp .snapshot directory, that doesn't
     * appear as a directory entry in the parent directory.
     * We'll just need our best guess.
     *
     * We only get here from zgetcwd(); let that fall back to pwd.
     */

    return NULL;
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}

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/*
 * Try to find the current directory.
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 * If we couldn't work it out internally, fall back to getcwd().
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 * If it fails, fall back to pwd; if zgetcwd() is being used
 * to set pwd, pwd should be NULL and we just return ".".
 */

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/**/
char *
zgetcwd(void)
{
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    char *ret = zgetdir(NULL);
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#ifdef HAVE_GETCWD
    if (!ret) {
#ifdef GETCWD_CALLS_MALLOC
	char *cwd = getcwd(NULL, 0);
	if (cwd) {
	    ret = dupstring(cwd);
	    free(cwd);
	}
#else
	char *cwdbuf = zalloc(PATH_MAX);
	ret = getcwd(cwdbuf, PATH_MAX);
	if (ret)
	    ret = dupstring(ret);
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	zfree(cwdbuf, PATH_MAX);
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#endif /* GETCWD_CALLS_MALLOC */
    }
#endif /* HAVE_GETCWD */
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    if (!ret)
	ret = pwd;
    if (!ret)
	ret = dupstring(".");
    return ret;
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}

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/*
 * chdir with arbitrary long pathname.  Returns 0 on success, -1 on normal *
 * failure and -2 when chdir failed and the current directory is lost.
 *
 * This is to be treated as if at system level, so dir is unmetafied but
 * terminated by a NULL.
 */
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/**/
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mod_export int
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zchdir(char *dir)
{
    char *s;
    int currdir = -2;

    for (;;) {
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	if (!*dir || chdir(dir) == 0) {
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#ifdef HAVE_FCHDIR
           if (currdir >= 0)
               close(currdir);
#endif
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	    return 0;
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	}
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	if ((errno != ENAMETOOLONG && errno != ENOMEM) ||
	    strlen(dir) < PATH_MAX)
	    break;
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	for (s = dir + PATH_MAX - 1; s > dir && *s != '/'; s--)
	    ;
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	if (s == dir)
	    break;
#ifdef HAVE_FCHDIR
	if (currdir == -2)
	    currdir = open(".", O_RDONLY|O_NOCTTY);
#endif
	*s = '\0';
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	if (chdir(dir) < 0) {
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	    *s = '/';
	    break;
	}
#ifndef HAVE_FCHDIR
	currdir = -1;
#endif
	*s = '/';
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	while (*++s == '/')
	    ;
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	dir = s;
    }
#ifdef HAVE_FCHDIR
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    if (currdir >= 0) {
	if (fchdir(currdir) < 0) {
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	    close(currdir);
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	    return -2;
	}
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	close(currdir);
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	return -1;
    }
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#endif
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    return currdir == -2 ? -1 : -2;
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}
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/*
 * How to print out a 64 bit integer.  This isn't needed (1) if longs
 * are 64 bit, since ordinary %ld will work (2) if we couldn't find a
 * 64 bit type anyway.
 */
/**/
#ifdef ZSH_64_BIT_TYPE
/**/
mod_export char *
output64(zlong val)
{
    static char llbuf[DIGBUFSIZE];
    convbase(llbuf, val, 0);
    return llbuf;
}
/**/
#endif /* ZSH_64_BIT_TYPE */
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#ifndef HAVE_STRTOUL

/*
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. 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.
 */

/*
 * Convert a string to an unsigned long integer.
 *
 * Ignores `locale' stuff.  Assumes that the upper and lower case
 * alphabets and digits are each contiguous.
 */
unsigned long
strtoul(nptr, endptr, base)
	const char *nptr;
	char **endptr;
	int base;
{
	const char *s;
	unsigned long acc, cutoff;
	int c;
	int neg, any, cutlim;

	/* endptr may be NULL */

	s = nptr;
	do {
		c = (unsigned char) *s++;
	} while (isspace(c));
	if (c == '-') {
		neg = 1;
		c = *s++;
	} else {
		neg = 0;
		if (c == '+')
			c = *s++;
	}
	if ((base == 0 || base == 16) &&
	    c == '0' && (*s == 'x' || *s == 'X')) {
		c = s[1];
		s += 2;
		base = 16;
	}
	if (base == 0)
		base = c == '0' ? 8 : 10;

	cutoff = ULONG_MAX / (unsigned long)base;
	cutlim = (int)(ULONG_MAX % (unsigned long)base);
	for (acc = 0, any = 0;; c = (unsigned char) *s++) {
		if (isdigit(c))
			c -= '0';
		else if (isalpha(c)) {
			c -= isupper(c) ? 'A' - 10 : 'a' - 10;
		} else
			break;
		if (c >= base)
			break;
		if (any < 0)
			continue;
		if (acc > cutoff || (acc == cutoff && c > cutlim)) {
			any = -1;
			acc = ULONG_MAX;
			errno = ERANGE;
		} else {
			any = 1;
			acc *= (unsigned long)base;
			acc += c;
		}
	}
	if (neg && any > 0)
		acc = -acc;
	if (endptr != NULL)
		*endptr = any ? s - 1 : nptr;
	return (acc);
}
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#endif /* HAVE_STRTOUL */

/**/
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#if defined(BROKEN_WCWIDTH) && (defined(__STDC_ISO_10646__) || defined(__APPLE__))
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/*
 * This is an implementation of wcwidth() and wcswidth() (defined in
 * IEEE Std 1002.1-2001) for Unicode.
 *
 * http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
 * http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
 *
 * In fixed-width output devices, Latin characters all occupy a single
 * "cell" position of equal width, whereas ideographic CJK characters
 * occupy two such cells. Interoperability between terminal-line
 * applications and (teletype-style) character terminals using the
 * UTF-8 encoding requires agreement on which character should advance
 * the cursor by how many cell positions. No established formal
 * standards exist at present on which Unicode character shall occupy
 * how many cell positions on character terminals. These routines are
 * a first attempt of defining such behavior based on simple rules
 * applied to data provided by the Unicode Consortium.
 *
 * For some graphical characters, the Unicode standard explicitly
 * defines a character-cell width via the definition of the East Asian
 * FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
 * In all these cases, there is no ambiguity about which width a
 * terminal shall use. For characters in the East Asian Ambiguous (A)
 * class, the width choice depends purely on a preference of backward
 * compatibility with either historic CJK or Western practice.
 * Choosing single-width for these characters is easy to justify as
 * the appropriate long-term solution, as the CJK practice of
 * displaying these characters as double-width comes from historic
 * implementation simplicity (8-bit encoded characters were displayed
 * single-width and 16-bit ones double-width, even for Greek,
 * Cyrillic, etc.) and not any typographic considerations.
 *
 * Much less clear is the choice of width for the Not East Asian
 * (Neutral) class. Existing practice does not dictate a width for any
 * of these characters. It would nevertheless make sense
 * typographically to allocate two character cells to characters such
 * as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
 * represented adequately with a single-width glyph. The following
 * routines at present merely assign a single-cell width to all
 * neutral characters, in the interest of simplicity. This is not
 * entirely satisfactory and should be reconsidered before
 * establishing a formal standard in this area. At the moment, the
 * decision which Not East Asian (Neutral) characters should be
 * represented by double-width glyphs cannot yet be answered by
 * applying a simple rule from the Unicode database content. Setting
 * up a proper standard for the behavior of UTF-8 character terminals
 * will require a careful analysis not only of each Unicode character,
 * but also of each presentation form, something the author of these
 * routines has avoided to do so far.
 *
 * http://www.unicode.org/unicode/reports/tr11/
 *
 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
 *
 * Permission to use, copy, modify, and distribute this software
 * for any purpose and without fee is hereby granted. The author
 * disclaims all warranties with regard to this software.
 *
 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
 */

struct interval {
  int first;
  int last;
};

/* auxiliary function for binary search in interval table */
static int bisearch(wchar_t ucs, const struct interval *table, int max) {
  int min = 0;
  int mid;

  if (ucs < table[0].first || ucs > table[max].last)
    return 0;
  while (max >= min) {
    mid = (min + max) / 2;
    if (ucs > table[mid].last)
      min = mid + 1;
    else if (ucs < table[mid].first)
      max = mid - 1;
    else
      return 1;
  }

  return 0;
}


/* The following two functions define the column width of an ISO 10646
 * character as follows:
 *
 *    - The null character (U+0000) has a column width of 0.
 *
 *    - Other C0/C1 control characters and DEL will lead to a return
 *      value of -1.
 *
 *    - Non-spacing and enclosing combining characters (general
 *      category code Mn or Me in the Unicode database) have a
 *      column width of 0.
 *
 *    - SOFT HYPHEN (U+00AD) has a column width of 1.
 *
 *    - Other format characters (general category code Cf in the Unicode
 *      database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
 *
 *    - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
 *      have a column width of 0.
 *
 *    - Spacing characters in the East Asian Wide (W) or East Asian
 *      Full-width (F) category as defined in Unicode Technical
 *      Report #11 have a column width of 2.
 *
 *    - All remaining characters (including all printable
 *      ISO 8859-1 and WGL4 characters, Unicode control characters,
 *      etc.) have a column width of 1.
 *
 * This implementation assumes that wchar_t characters are encoded
 * in ISO 10646.
 */

/**/
int
mk_wcwidth(wchar_t ucs)
{
  /* sorted list of non-overlapping intervals of non-spacing characters */
  /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
  static const struct interval combining[] = {
    { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
    { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
    { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
    { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
    { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
    { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
    { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
    { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
    { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
    { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
    { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
    { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
    { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
    { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
    { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
    { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
    { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
    { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
    { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
    { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
    { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
    { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
    { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
    { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
    { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
    { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
    { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
    { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
    { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
    { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
    { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
    { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
    { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
    { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
    { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
    { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
    { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
    { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
    { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
    { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
    { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
    { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
    { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
    { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
    { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
    { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
    { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
    { 0xE0100, 0xE01EF }
  };

  /* test for 8-bit control characters */
  if (ucs == 0)
    return 0;
  if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
    return -1;

  /* binary search in table of non-spacing characters */
  if (bisearch(ucs, combining,
	       sizeof(combining) / sizeof(struct interval) - 1))
    return 0;

  /* if we arrive here, ucs is not a combining or C0/C1 control character */

829
  return 1 +
830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956
    (ucs >= 0x1100 &&
     (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
      ucs == 0x2329 || ucs == 0x232a ||
      (ucs >= 0x2e80 && ucs <= 0xa4cf &&
       ucs != 0x303f) ||                  /* CJK ... Yi */
      (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
      (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
      (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
      (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
      (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
      (ucs >= 0xffe0 && ucs <= 0xffe6) ||
      (ucs >= 0x20000 && ucs <= 0x2fffd) ||
      (ucs >= 0x30000 && ucs <= 0x3fffd)));
}


/*
 * The following functions are part of the original wcwidth.c:
 * we don't use them but I've kept them in case - pws.
 */
#if 0
int mk_wcswidth(const wchar_t *pwcs, size_t n)
{
  int w, width = 0;

  for (;*pwcs && n-- > 0; pwcs++)
    if ((w = mk_wcwidth(*pwcs)) < 0)
      return -1;
    else
      width += w;

  return width;
}


/*
 * The following functions are the same as mk_wcwidth() and
 * mk_wcswidth(), except that spacing characters in the East Asian
 * Ambiguous (A) category as defined in Unicode Technical Report #11
 * have a column width of 2. This variant might be useful for users of
 * CJK legacy encodings who want to migrate to UCS without changing
 * the traditional terminal character-width behaviour. It is not
 * otherwise recommended for general use.
 */
int mk_wcwidth_cjk(wchar_t ucs)
{
  /* sorted list of non-overlapping intervals of East Asian Ambiguous
   * characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */
  static const struct interval ambiguous[] = {
    { 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 },
    { 0x00AA, 0x00AA }, { 0x00AE, 0x00AE }, { 0x00B0, 0x00B4 },
    { 0x00B6, 0x00BA }, { 0x00BC, 0x00BF }, { 0x00C6, 0x00C6 },
    { 0x00D0, 0x00D0 }, { 0x00D7, 0x00D8 }, { 0x00DE, 0x00E1 },
    { 0x00E6, 0x00E6 }, { 0x00E8, 0x00EA }, { 0x00EC, 0x00ED },
    { 0x00F0, 0x00F0 }, { 0x00F2, 0x00F3 }, { 0x00F7, 0x00FA },
    { 0x00FC, 0x00FC }, { 0x00FE, 0x00FE }, { 0x0101, 0x0101 },
    { 0x0111, 0x0111 }, { 0x0113, 0x0113 }, { 0x011B, 0x011B },
    { 0x0126, 0x0127 }, { 0x012B, 0x012B }, { 0x0131, 0x0133 },
    { 0x0138, 0x0138 }, { 0x013F, 0x0142 }, { 0x0144, 0x0144 },
    { 0x0148, 0x014B }, { 0x014D, 0x014D }, { 0x0152, 0x0153 },
    { 0x0166, 0x0167 }, { 0x016B, 0x016B }, { 0x01CE, 0x01CE },
    { 0x01D0, 0x01D0 }, { 0x01D2, 0x01D2 }, { 0x01D4, 0x01D4 },
    { 0x01D6, 0x01D6 }, { 0x01D8, 0x01D8 }, { 0x01DA, 0x01DA },
    { 0x01DC, 0x01DC }, { 0x0251, 0x0251 }, { 0x0261, 0x0261 },
    { 0x02C4, 0x02C4 }, { 0x02C7, 0x02C7 }, { 0x02C9, 0x02CB },
    { 0x02CD, 0x02CD }, { 0x02D0, 0x02D0 }, { 0x02D8, 0x02DB },
    { 0x02DD, 0x02DD }, { 0x02DF, 0x02DF }, { 0x0391, 0x03A1 },
    { 0x03A3, 0x03A9 }, { 0x03B1, 0x03C1 }, { 0x03C3, 0x03C9 },
    { 0x0401, 0x0401 }, { 0x0410, 0x044F }, { 0x0451, 0x0451 },
    { 0x2010, 0x2010 }, { 0x2013, 0x2016 }, { 0x2018, 0x2019 },
    { 0x201C, 0x201D }, { 0x2020, 0x2022 }, { 0x2024, 0x2027 },
    { 0x2030, 0x2030 }, { 0x2032, 0x2033 }, { 0x2035, 0x2035 },
    { 0x203B, 0x203B }, { 0x203E, 0x203E }, { 0x2074, 0x2074 },
    { 0x207F, 0x207F }, { 0x2081, 0x2084 }, { 0x20AC, 0x20AC },
    { 0x2103, 0x2103 }, { 0x2105, 0x2105 }, { 0x2109, 0x2109 },
    { 0x2113, 0x2113 }, { 0x2116, 0x2116 }, { 0x2121, 0x2122 },
    { 0x2126, 0x2126 }, { 0x212B, 0x212B }, { 0x2153, 0x2154 },
    { 0x215B, 0x215E }, { 0x2160, 0x216B }, { 0x2170, 0x2179 },
    { 0x2190, 0x2199 }, { 0x21B8, 0x21B9 }, { 0x21D2, 0x21D2 },
    { 0x21D4, 0x21D4 }, { 0x21E7, 0x21E7 }, { 0x2200, 0x2200 },
    { 0x2202, 0x2203 }, { 0x2207, 0x2208 }, { 0x220B, 0x220B },
    { 0x220F, 0x220F }, { 0x2211, 0x2211 }, { 0x2215, 0x2215 },
    { 0x221A, 0x221A }, { 0x221D, 0x2220 }, { 0x2223, 0x2223 },
    { 0x2225, 0x2225 }, { 0x2227, 0x222C }, { 0x222E, 0x222E },
    { 0x2234, 0x2237 }, { 0x223C, 0x223D }, { 0x2248, 0x2248 },
    { 0x224C, 0x224C }, { 0x2252, 0x2252 }, { 0x2260, 0x2261 },
    { 0x2264, 0x2267 }, { 0x226A, 0x226B }, { 0x226E, 0x226F },
    { 0x2282, 0x2283 }, { 0x2286, 0x2287 }, { 0x2295, 0x2295 },
    { 0x2299, 0x2299 }, { 0x22A5, 0x22A5 }, { 0x22BF, 0x22BF },
    { 0x2312, 0x2312 }, { 0x2460, 0x24E9 }, { 0x24EB, 0x254B },
    { 0x2550, 0x2573 }, { 0x2580, 0x258F }, { 0x2592, 0x2595 },
    { 0x25A0, 0x25A1 }, { 0x25A3, 0x25A9 }, { 0x25B2, 0x25B3 },
    { 0x25B6, 0x25B7 }, { 0x25BC, 0x25BD }, { 0x25C0, 0x25C1 },
    { 0x25C6, 0x25C8 }, { 0x25CB, 0x25CB }, { 0x25CE, 0x25D1 },
    { 0x25E2, 0x25E5 }, { 0x25EF, 0x25EF }, { 0x2605, 0x2606 },
    { 0x2609, 0x2609 }, { 0x260E, 0x260F }, { 0x2614, 0x2615 },
    { 0x261C, 0x261C }, { 0x261E, 0x261E }, { 0x2640, 0x2640 },
    { 0x2642, 0x2642 }, { 0x2660, 0x2661 }, { 0x2663, 0x2665 },
    { 0x2667, 0x266A }, { 0x266C, 0x266D }, { 0x266F, 0x266F },
    { 0x273D, 0x273D }, { 0x2776, 0x277F }, { 0xE000, 0xF8FF },
    { 0xFFFD, 0xFFFD }, { 0xF0000, 0xFFFFD }, { 0x100000, 0x10FFFD }
  };

  /* binary search in table of non-spacing characters */
  if (bisearch(ucs, ambiguous,
	       sizeof(ambiguous) / sizeof(struct interval) - 1))
    return 2;

  return mk_wcwidth(ucs);
}


int mk_wcswidth_cjk(const wchar_t *pwcs, size_t n)
{
  int w, width = 0;

  for (;*pwcs && n-- > 0; pwcs++)
    if ((w = mk_wcwidth_cjk(*pwcs)) < 0)
      return -1;
    else
      width += w;

  return width;
}
#endif /* 0 */

/**/
957
#endif /* BROKEN_WCWIDTH && (__STDC_ISO_10646__ || __APPLE__) */
958

959 960 961 962 963 964 965 966 967 968 969 970 971 972 973
/**/
#if defined(__APPLE__) && defined(BROKEN_ISPRINT)

/**/
int
isprint_ascii(int c)
{
    if (!strcmp(nl_langinfo(CODESET), "UTF-8"))
	return (c >= 0x20 && c <= 0x7e);
    else
	return isprint(c);
}

/**/
#endif /* __APPLE__ && BROKEN_ISPRINT */