home *** CD-ROM | disk | FTP | other *** search
- /* $Header: /home/hyperion/mu/christos/src/sys/tcsh-6.00/RCS/sh.misc.c,v 3.4 1991/07/15 19:37:24 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. 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.
- */
- #include "config.h"
- RCSID("$Id: sh.misc.c,v 3.4 1991/07/15 19:37:24 christos Exp $")
-
- #include "sh.h"
-
- #ifdef __MINT__
- extern int __mint; /* kernel version */
- #endif
-
- static int renum __P((int, int));
-
- /*
- * C Shell
- */
-
- int
- any(s, c)
- register char *s;
- register int c;
- {
- if (!s)
- return (0); /* Check for nil pointer */
- while (*s)
- if (*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)
- register const char *s;
- {
- char *n;
- register char *p;
-
- if (s == NULL)
- s = (const char *) "";
- for (p = (char *) s; *p++;);
- n = p = (char *) xmalloc((size_t) ((p - s) * sizeof(char)));
- while (*p++ = *s++);
- return (n);
- }
-
- Char **
- blkend(up)
- register Char **up;
- {
-
- while (*up)
- up++;
- return (up);
- }
-
-
- void
- blkpr(av)
- register Char **av;
- {
-
- for (; *av; av++) {
- xprintf("%s", short2str(*av));
- if (av[1])
- xprintf(" ");
- }
- }
-
- int
- blklen(av)
- register Char **av;
- {
- register int i = 0;
-
- while (*av++)
- i++;
- return (i);
- }
-
- Char **
- blkcpy(oav, bv)
- Char **oav;
- register Char **bv;
- {
- register Char **av = oav;
-
- while (*av++ = *bv++)
- continue;
- return (oav);
- }
-
- Char **
- blkcat(up, vp)
- Char **up, **vp;
- {
-
- (void) blkcpy(blkend(up), vp);
- return (up);
- }
-
- void
- blkfree(av0)
- Char **av0;
- {
- register Char **av = av0;
-
- if (!av0)
- return;
- for (; *av; av++)
- xfree((ptr_t) * av);
- xfree((ptr_t) av0);
- }
-
- Char **
- saveblk(v)
- register Char **v;
- {
- register Char **newv =
- (Char **) xcalloc((size_t) (blklen(v) + 1), sizeof(Char **));
- Char **onewv = newv;
-
- while (*v)
- *newv++ = Strsave(*v++);
- return (onewv);
- }
-
- #ifndef POSIX
- char *
- strstr(s, t)
- register const char *s, *t;
- {
- do {
- register const char *ss = s;
- register const char *tt = t;
-
- do
- if (*tt == '\0')
- return ((char *) s);
- while (*ss++ == *tt++);
- } while (*s++ != '\0');
- return (NULL);
- }
-
- #endif /* POSIX */
-
- #ifndef SHORT_STRINGS
- char *
- strspl(cp, dp)
- char *cp, *dp;
- {
- char *ep;
- register char *p, *q;
-
- if (!cp)
- cp = "";
- if (!dp)
- dp = "";
- for (p = cp; *p++;);
- for (q = dp; *q++;);
- ep = (char *) xmalloc((size_t) (((p - cp) + (q - dp) - 1) * sizeof(char)));
- for (p = ep, q = cp; *p++ = *q++;);
- for (p--, q = dp; *p++ = *q++;);
- return (ep);
- }
-
- #endif
-
- Char **
- blkspl(up, vp)
- register Char **up, **vp;
- {
- register Char **wp =
- (Char **) xcalloc((size_t) (blklen(up) + blklen(vp) + 1),
- sizeof(Char **));
-
- (void) blkcpy(wp, up);
- return (blkcat(wp, vp));
- }
-
- Char
- lastchr(cp)
- register 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()
- {
- register int f;
-
- #ifdef YPBUGS
- /* suggested by Justin Bur; thanks to Karl Kleinpaste */
- fix_yp_bugs();
- #endif
- for (f = 0; f < NOFILE; f++)
- if (f != SHIN && f != SHOUT && f != SHDIAG && f != OLDSTD &&
- f != FSHTTY)
- (void) close(f);
- }
-
- #ifndef FIOCLEX
- /*
- * 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()
- {
- register int f;
-
- #ifdef __MINT__
- /* in TOS, all handles are shared by all processes! (ack!) */
- if (__mint == 0)
- return;
- #endif
- 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
-
- void
- donefds()
- {
-
- (void) close(0);
- (void) close(1);
- (void) close(2);
- didfds = 0;
- }
-
- /*
- * 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 > 2. This also happens in dcopy.
- */
- int
- dmove(i, j)
- register int i, j;
- {
-
- if (i == j || i < 0)
- return (i);
- #ifdef HAVEDUP2
- # ifdef __MINT__
- if (__mint != 0) /* TOS screws up dup2 */
- # endif
- 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)
- register int i, j;
- {
-
- if (i == j || i < 0 || j < 0 && i > 2)
- return (i);
- #ifdef __MINT__
- if (__mint == 0 && j > 5) {
- return (i <= 5) ? dup(i) : j;
- }
- #endif
- #ifdef HAVEDUP2
- if (j >= 0) {
- (void) dup2(i, j);
- return (j);
- }
- #endif
- (void) close(j);
- return (renum(i, j));
- }
-
- static int
- renum(i, j)
- register int i, j;
- {
- register int k = dup(i);
-
- if (k < 0)
- return (-1);
- if (j == -1 && k > 2)
- return (k);
- if (k != j) {
- j = renum(k, j);
- (void) close(k);
- return (j);
- }
- return (k);
- }
-
- void
- copy(to, from, size)
- register char *to, *from;
- register int size;
- {
-
- if (size && from && to)
- do
- *to++ = *from++;
- while (--size != 0);
- }
-
- /*
- * 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)
- register Char **v;
- register int c;
- {
- register Char **u = v;
-
- while (*u && --c >= 0)
- 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)
- register Char **v;
- {
- register Char **nv =
- (Char **) xcalloc((size_t) (blklen(v) + 1), sizeof(Char **));
-
- return (blkcpy(nv, v));
- }
-
- #ifndef SHORT_STRINGS
- char *
- strend(cp)
- register char *cp;
- {
- if (!cp)
- return (cp);
- while (*cp)
- cp++;
- return (cp);
- }
-
- #endif /* SHORT_STRINGS */
-
- Char *
- strip(cp)
- Char *cp;
- {
- register Char *dp = cp;
-
- if (!cp)
- return (cp);
- while (*dp++ &= TRIM)
- continue;
- return (cp);
- }
-
- void
- udvar(name)
- Char *name;
- {
-
- setname(short2str(name));
- stderror(ERR_NAME | ERR_UNDVAR);
- }
-
- int
- prefix(sub, str)
- register Char *sub, *str;
- {
-
- for (;;) {
- if (*sub == 0)
- return (1);
- if (*str == 0)
- return (0);
- if (*sub++ != *str++)
- return (0);
- }
- }
-
- #ifdef __MINT__
- Char *
- Lastslash(pth)
- Char *pth;
- {
- Char *slash = 0, c;
-
- while ( (c = *pth++) != 0) {
- if (is_dirsep(c))
- slash = pth - 1;
- }
- return slash;
- }
- #endif /* __MINT__ */
-