342 lines
5.8 KiB
C
342 lines
5.8 KiB
C
/* $OpenBSD: misc.c,v 1.25 2018/10/24 06:01:03 martijn Exp $ */
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/* $NetBSD: misc.c,v 1.6 1995/03/21 09:03:09 cgd Exp $ */
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/*-
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* Copyright (c) 1980, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include "csh.h"
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#include "extern.h"
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static int fdcmp(int);
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static int renum(int, int);
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int
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any(char *s, int c)
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{
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if (!s)
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return (0); /* Check for nil pointer */
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while (*s)
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if (*s++ == c)
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return (1);
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return (0);
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}
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Char **
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blkend(Char **up)
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{
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while (*up)
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up++;
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return (up);
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}
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void
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blkpr(FILE *fp, Char **av)
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{
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for (; *av; av++) {
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(void) fprintf(fp, "%s", vis_str(*av));
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if (av[1])
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(void) fprintf(fp, " ");
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}
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}
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int
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blklen(Char **av)
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{
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int i = 0;
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while (*av++)
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i++;
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return (i);
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}
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Char **
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blkcpy(Char **oav, Char **bv)
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{
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Char **av = oav;
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while ((*av++ = *bv++) != NULL)
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continue;
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return (oav);
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}
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Char **
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blkcat(Char **up, Char **vp)
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{
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(void) blkcpy(blkend(up), vp);
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return (up);
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}
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void
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blkfree(Char **av0)
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{
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Char **av = av0;
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if (!av0)
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return;
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for (; *av; av++)
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free(* av);
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free(av0);
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}
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Char **
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saveblk(Char **v)
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{
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Char **newv = xcalloc(blklen(v) + 1, sizeof(*newv));
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Char **onewv = newv;
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while (*v)
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*newv++ = Strsave(*v++);
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return (onewv);
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}
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Char **
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blkspl(Char **up, Char **vp)
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{
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Char **wp = xcalloc(blklen(up) + blklen(vp) + 1, sizeof(*wp));
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(void) blkcpy(wp, up);
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return (blkcat(wp, vp));
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}
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Char
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lastchr(Char *cp)
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{
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if (!cp)
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return (0);
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if (!*cp)
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return (0);
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while (cp[1])
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cp++;
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return (*cp);
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}
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/*
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* Returns 0 if fd is in use, 1 if fd is greater than the largest used file
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* descriptor and -1 otherwise.
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*/
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static int
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fdcmp(int fd)
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{
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int fds[] = { SHIN, SHOUT, SHERR, OLDSTD, FSHTTY };
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int i, max;
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max = -1;
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for (i = 0; i < sizeof(fds)/sizeof(fds[0]); i++) {
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if (fd == fds[i])
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return (0);
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if (fds[i] > max)
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max = fds[i];
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}
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if (fd > max)
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return (1);
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return (-1);
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}
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/*
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* This routine is called after an error to close up
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* any units which may have been left open accidentally.
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*/
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void
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closem(void)
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{
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int f;
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int max = sysconf(_SC_OPEN_MAX);
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for (f = 0; f < max; f++)
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switch (fdcmp(f)) {
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case 0:
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continue;
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case 1:
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closefrom(f);
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return;
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default:
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close(f);
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}
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}
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void
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donefds(void)
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{
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(void) close(0);
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(void) close(1);
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(void) close(2);
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didfds = 0;
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}
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/*
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* Move descriptor i to j.
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* If j is -1 then we just want to get i to a safe place,
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* i.e. to a unit > 2. This also happens in dcopy.
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*/
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int
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dmove(int i, int j)
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{
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if (i == j || i < 0)
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return (i);
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if (j >= 0) {
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(void) dup2(i, j);
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if (j != i)
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(void) close(i);
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return (j);
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}
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j = dcopy(i, j);
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if (j != i)
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(void) close(i);
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return (j);
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}
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int
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dcopy(int i, int j)
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{
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if (i == j || i < 0 || (j < 0 && i > 2))
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return (i);
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if (j >= 0) {
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(void) dup2(i, j);
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return (j);
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}
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(void) close(j);
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return (renum(i, j));
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}
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static int
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renum(int i, int j)
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{
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int k = dup(i);
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if (k < 0)
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return (-1);
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if (j == -1 && k > 2)
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return (k);
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if (k != j) {
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j = renum(k, j);
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(void) close(k);
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return (j);
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}
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return (k);
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}
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/*
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* Left shift a command argument list, discarding
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* the first c arguments. Used in "shift" commands
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* as well as by commands like "repeat".
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*/
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void
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lshift(Char **v, int c)
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{
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Char **u;
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for (u = v; *u && --c >= 0; u++)
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free(*u);
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(void) blkcpy(v, u);
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}
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int
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number(Char *cp)
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{
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if (!cp)
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return(0);
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if (*cp == '-') {
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cp++;
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if (!Isdigit(*cp))
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return (0);
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cp++;
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}
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while (*cp && Isdigit(*cp))
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cp++;
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return (*cp == 0);
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}
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Char **
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copyblk(Char **v)
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{
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Char **nv = xcalloc(blklen(v) + 1, sizeof(*nv));
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return (blkcpy(nv, v));
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}
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Char *
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strip(Char *cp)
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{
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Char *dp = cp;
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if (!cp)
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return (cp);
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while ((*dp++ &= TRIM) != '\0')
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continue;
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return (cp);
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}
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Char *
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quote(Char *cp)
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{
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Char *dp = cp;
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if (!cp)
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return (cp);
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while (*dp != '\0')
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*dp++ |= QUOTE;
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return (cp);
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}
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void
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udvar(Char *name)
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{
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setname(vis_str(name));
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stderror(ERR_NAME | ERR_UNDVAR);
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}
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int
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prefix(Char *sub, Char *str)
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{
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for (;;) {
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if (*sub == 0)
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return (1);
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if (*str == 0)
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return (0);
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if (*sub++ != *str++)
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return (0);
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}
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}
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