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sh.misc.c

/* $Header: /src/pub/tcsh/sh.misc.c,v 3.34 2005/01/18 20:24:50 christos Exp $ */
/*
 * sh.misc.c: Miscelaneous functions
 */
/*-
 * Copyright (c) 1980, 1991 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.
 */
#include "sh.h"

RCSID("$Id: sh.misc.c,v 3.34 2005/01/18 20:24:50 christos Exp $")

static      int   renum __P((int, int));
static  Char  **blkend  __P((Char **));
static  Char  **blkcat  __P((Char **, Char **));

/*
 * C Shell
 */

int
any(s, c)
    const char *s;
    Char c;
{
    if (!s)
      return (0);       /* Check for nil pointer */
    while (*s)
      if ((Char)*s++ == c)
          return (1);
    return (0);
}

void
setzero(cp, i)
    char   *cp;
    int     i;
{
    if (i != 0)
      do
          *cp++ = 0;
      while (--i);
}

char   *
strsave(s)
    const char *s;
{
    char   *n, *r;
    const char *p;

    if (s == NULL)
      s = "";
    for (p = s; *p++ != '\0';)
      continue;
    r = n = (char *) xmalloc((size_t)((((const char *) p) - s) * sizeof(char)));
    while ((*n++ = *s++) != '\0')
      continue;
    return (r);
}

static Char  **
blkend(up)
    Char **up;
{

    while (*up)
      up++;
    return (up);
}


void
blkpr(av)
    Char **av;
{

    for (; *av; av++) {
      xprintf("%S", *av);
      if (av[1])
          xprintf(" ");
    }
}

void
blkexpand(av, str)
    Char **av;
    Char *str;
{
    *str = '\0';
    for (; *av; av++) {
      (void) Strcat(str, *av);
      if (av[1])
          (void) Strcat(str, STRspace);
    }
}

int
blklen(av)
    Char **av;
{
    int i = 0;

    while (*av++)
      i++;
    return (i);
}

Char  **
blkcpy(oav, bv)
    Char  **oav;
    Char **bv;
{
    Char **av = oav;

    while ((*av++ = *bv++) != NULL)
      continue;
    return (oav);
}

static Char  **
blkcat(up, vp)
    Char  **up, **vp;
{

    (void) blkcpy(blkend(up), vp);
    return (up);
}

void
blkfree(av0)
    Char  **av0;
{
    Char **av = av0;

    if (!av0)
      return;
    for (; *av; av++)
      xfree((ptr_t) * av);
    xfree((ptr_t) av0);
}

Char  **
saveblk(v)
    Char **v;
{
    Char **newv =
    (Char **) xcalloc((size_t) (blklen(v) + 1), sizeof(Char **));
    Char  **onewv = newv;

    while (*v)
      *newv++ = Strsave(*v++);
    return (onewv);
}

#ifndef HAVE_STRSTR
char   *
strstr(s, t)
    const char *s, *t;
{
    do {
      const char *ss = s;
      const char *tt = t;

      do
          if (*tt == '\0')
            return ((char *) s);
      while (*ss++ == *tt++);
    } while (*s++ != '\0');
    return (NULL);
}
#endif /* !HAVE_STRSTR */

#ifndef SHORT_STRINGS
char   *
strspl(cp, dp)
    const char *cp, *dp;
{
    char   *ep;
    size_t cl, dl;

    if (!cp)
      cp = "";
    if (!dp)
      dp = "";
    cl = strlen(cp);
    dl = strlen(dp);
    ep = (char *) xmalloc((cl + dl + 1) * sizeof(char));
    memcpy(ep, cp, cl);
    memcpy(ep + cl, dp, dl + 1);
    return (ep);
}

#endif /* !SHORT_STRINGS */

Char  **
blkspl(up, vp)
    Char **up, **vp;
{
    Char **wp =
    (Char **) xcalloc((size_t) (blklen(up) + blklen(vp) + 1),
                  sizeof(Char **));

    (void) blkcpy(wp, up);
    return (blkcat(wp, vp));
}

Char
lastchr(cp)
    Char *cp;
{

    if (!cp)
      return (0);
    if (!*cp)
      return (0);
    while (cp[1])
      cp++;
    return (*cp);
}

/*
 * This routine is called after an error to close up
 * any units which may have been left open accidentally.
 */
void
closem()
{
    int f;

#ifdef NLS_BUGS
#ifdef NLS_CATALOGS
    nlsclose();
#endif /* NLS_CATALOGS */
#endif /* NLS_BUGS */
#ifdef YPBUGS
    /* suggested by Justin Bur; thanks to Karl Kleinpaste */
    fix_yp_bugs();
#endif /* YPBUGS */
    for (f = 0; f < NOFILE; f++)
      if (f != SHIN && f != SHOUT && f != SHDIAG && f != OLDSTD &&
          f != FSHTTY 
#ifdef MALLOC_TRACE
          && f != 25
#endif /* MALLOC_TRACE */
          )
        {
          (void) close(f);
#ifdef NISPLUS
          if(f < 3)
            (void) open(_PATH_DEVNULL, O_RDONLY|O_LARGEFILE);
#endif /* NISPLUS */
        }
#ifdef NLS_BUGS
#ifdef NLS_CATALOGS
    nlsinit();
#endif /* NLS_CATALOGS */
#endif /* NLS_BUGS */
}

#ifndef CLOSE_ON_EXEC
/*
 * Close files before executing a file.
 * We could be MUCH more intelligent, since (on a version 7 system)
 * we need only close files here during a source, the other
 * shell fd's being in units 16-19 which are closed automatically!
 */
void
closech()
{
    int f;

    if (didcch)
      return;
    didcch = 1;
    SHIN = 0;
    SHOUT = 1;
    SHDIAG = 2;
    OLDSTD = 0;
    isoutatty = isatty(SHOUT);
    isdiagatty = isatty(SHDIAG);
    for (f = 3; f < NOFILE; f++)
      (void) close(f);
}

#endif /* CLOSE_ON_EXEC */

void
donefds()
{

    (void) close(0);
    (void) close(1);
    (void) close(2);
    didfds = 0;
#ifdef NISPLUS
    {
      int fd = open(_PATH_DEVNULL, O_RDONLY|O_LARGEFILE);
      (void)dcopy(fd, 1);
      (void)dcopy(fd, 2);
      (void)dmove(fd, 0);
    }
#endif /*NISPLUS*/    
}

/*
 * Move descriptor i to j.
 * If j is -1 then we just want to get i to a safe place,
 * i.e. to a unit > FSAFE.  This also happens in dcopy.
 */
int
dmove(i, j)
    int i, j;
{

    if (i == j || i < 0)
      return (i);
#ifdef HAVE_DUP2
    if (j >= 0) {
      (void) dup2(i, j);
      if (j != i)
          (void) close(i);
      return (j);
    }
#endif
    j = dcopy(i, j);
    if (j != i)
      (void) close(i);
    return (j);
}

int
dcopy(i, j)
    int i, j;
{

    if (i == j || i < 0 || (j < 0 && i > FSAFE))
      return (i);
    if (j >= 0) {
#ifdef HAVE_DUP2
      (void) dup2(i, j);
      return (j);
#else
      (void) close(j);
#endif
    }
    return (renum(i, j));
}

static int
renum(i, j)
    int i, j;
{
    int k = dup(i);

    if (k < 0)
      return (-1);
    if (j == -1 && k > FSAFE)
      return (k);
    if (k != j) {
      j = renum(k, j);
      (void) close(k);
      return (j);
    }
    return (k);
}

/*
 * Left shift a command argument list, discarding
 * the first c arguments.  Used in "shift" commands
 * as well as by commands like "repeat".
 */
void
lshift(v, c)
    Char **v;
    int c;
{
    Char **u;

    for (u = v; *u && --c >= 0; u++)
      xfree((ptr_t) *u);
    (void) blkcpy(v, u);
}

int
number(cp)
    Char   *cp;
{
    if (!cp)
      return (0);
    if (*cp == '-') {
      cp++;
      if (!Isdigit(*cp))
          return (0);
      cp++;
    }
    while (*cp && Isdigit(*cp))
      cp++;
    return (*cp == 0);
}

Char  **
copyblk(v)
    Char **v;
{
    Char **nv =
    (Char **) xcalloc((size_t) (blklen(v) + 1), sizeof(Char **));

    return (blkcpy(nv, v));
}

#ifndef SHORT_STRINGS
char   *
strend(cp)
    char *cp;
{
    if (!cp)
      return (cp);
    while (*cp)
      cp++;
    return (cp);
}

#endif /* SHORT_STRINGS */

Char   *
strip(cp)
    Char   *cp;
{
    Char *dp = cp;

    if (!cp)
      return (cp);
    while ((*dp++ &= TRIM) != '\0')
      continue;
    return (cp);
}

Char   *
quote(cp)
    Char   *cp;
{
    Char *dp = cp;

    if (!cp)
      return (cp);
    while (*dp != '\0')
      *dp++ |= QUOTE;
    return (cp);
}

Char   *
quote_meta(d, s)
    Char   *d;
    const Char   *s;
{
    Char *r = d;
    while (*s != '\0') {
      if (cmap(*s, _META | _DOL | _QF | _QB | _ESC | _GLOB))
            *d++ = '\\';
      *d++ = *s++;
    }
    *d = '\0';
    return r;
}

void
udvar(name)
    Char   *name;
{

    setname(short2str(name));
    stderror(ERR_NAME | ERR_UNDVAR);
}

int
prefix(sub, str)
    const Char *sub, *str;
{

    for (;;) {
      if (*sub == 0)
          return (1);
      if (*str == 0)
          return (0);
      if ((*sub++ & TRIM) != (*str++ & TRIM))
          return (0);
    }
}

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