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Diffstat (limited to 'release/picobsd/tinyware/ash/cd.c')
-rw-r--r-- | release/picobsd/tinyware/ash/cd.c | 383 |
1 files changed, 0 insertions, 383 deletions
diff --git a/release/picobsd/tinyware/ash/cd.c b/release/picobsd/tinyware/ash/cd.c deleted file mode 100644 index b029045..0000000 --- a/release/picobsd/tinyware/ash/cd.c +++ /dev/null @@ -1,383 +0,0 @@ -/* $NetBSD: cd.c,v 1.23 1997/07/04 20:59:40 christos Exp $ */ - -/*- - * Copyright (c) 1991, 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Kenneth Almquist. - * - * 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 <sys/cdefs.h> -#ifndef lint -#if 0 -static char sccsid[] = "@(#)cd.c 8.2 (Berkeley) 5/4/95"; -#else -__RCSID("$NetBSD: cd.c,v 1.23 1997/07/04 20:59:40 christos Exp $"); -#endif -#endif /* not lint */ - -#include <sys/types.h> -#include <sys/stat.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <errno.h> - -/* - * The cd and pwd commands. - */ - -#include "shell.h" -#include "var.h" -#include "nodes.h" /* for jobs.h */ -#include "jobs.h" -#include "options.h" -#include "output.h" -#include "memalloc.h" -#include "error.h" -#include "exec.h" -#include "redir.h" -#include "mystring.h" -#include "show.h" -#include "cd.h" - -STATIC int docd __P((char *, int)); -STATIC char *getcomponent __P((void)); -STATIC void updatepwd __P((char *)); - -char *curdir = NULL; /* current working directory */ -char *prevdir; /* previous working directory */ -STATIC char *cdcomppath; - -int -cdcmd(argc, argv) - int argc; - char **argv; -{ - char *dest; - char *path; - char *p; - struct stat statb; - int print = 0; - - nextopt(nullstr); - if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME", 1)) == NULL) - error("HOME not set"); - if (*dest == '\0') - dest = "."; - if (dest[0] == '-' && dest[1] == '\0') { - dest = prevdir ? prevdir : curdir; - print = 1; - if (dest) - print = 1; - else - dest = "."; - } - if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL) - path = nullstr; - while ((p = padvance(&path, dest)) != NULL) { - if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) { - if (!print) { - /* - * XXX - rethink - */ - if (p[0] == '.' && p[1] == '/') - p += 2; - print = strcmp(p, dest); - } - if (docd(p, print) >= 0) - return 0; - - } - } - error("can't cd to %s", dest); - /*NOTREACHED*/ - return 0; -} - - -/* - * Actually do the chdir. In an interactive shell, print the - * directory name if "print" is nonzero. - */ - -STATIC int -docd(dest, print) - char *dest; - int print; -{ - char *p; - char *q; - char *component; - struct stat statb; - int first; - int badstat; - - TRACE(("docd(\"%s\", %d) called\n", dest, print)); - - /* - * Check each component of the path. If we find a symlink or - * something we can't stat, clear curdir to force a getcwd() - * next time we get the value of the current directory. - */ - badstat = 0; - cdcomppath = stalloc(strlen(dest) + 1); - scopy(dest, cdcomppath); - STARTSTACKSTR(p); - if (*dest == '/') { - STPUTC('/', p); - cdcomppath++; - } - first = 1; - while ((q = getcomponent()) != NULL) { - if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0')) - continue; - if (! first) - STPUTC('/', p); - first = 0; - component = q; - while (*q) - STPUTC(*q++, p); - if (equal(component, "..")) - continue; - STACKSTRNUL(p); - if ((lstat(stackblock(), &statb) < 0) - || (S_ISLNK(statb.st_mode))) { - /* print = 1; */ - badstat = 1; - break; - } - } - - INTOFF; - if (chdir(dest) < 0) { - INTON; - return -1; - } - updatepwd(badstat ? NULL : dest); - INTON; - if (print && iflag && curdir) - out1fmt("%s\n", curdir); - return 0; -} - - -/* - * Get the next component of the path name pointed to by cdcomppath. - * This routine overwrites the string pointed to by cdcomppath. - */ - -STATIC char * -getcomponent() { - char *p; - char *start; - - if ((p = cdcomppath) == NULL) - return NULL; - start = cdcomppath; - while (*p != '/' && *p != '\0') - p++; - if (*p == '\0') { - cdcomppath = NULL; - } else { - *p++ = '\0'; - cdcomppath = p; - } - return start; -} - - - -/* - * Update curdir (the name of the current directory) in response to a - * cd command. We also call hashcd to let the routines in exec.c know - * that the current directory has changed. - */ - -STATIC void -updatepwd(dir) - char *dir; - { - char *new; - char *p; - - hashcd(); /* update command hash table */ - - /* - * If our argument is NULL, we don't know the current directory - * any more because we traversed a symbolic link or something - * we couldn't stat(). - */ - if (dir == NULL) { - if (prevdir) - ckfree(prevdir); - INTOFF; - prevdir = curdir; - curdir = NULL; - getpwd(); - INTON; - return; - } - - cdcomppath = stalloc(strlen(dir) + 1); - scopy(dir, cdcomppath); - STARTSTACKSTR(new); - if (*dir != '/') { - if (curdir == NULL) - return; - p = curdir; - while (*p) - STPUTC(*p++, new); - if (p[-1] == '/') - STUNPUTC(new); - } - while ((p = getcomponent()) != NULL) { - if (equal(p, "..")) { - while (new > stackblock() && (STUNPUTC(new), *new) != '/'); - } else if (*p != '\0' && ! equal(p, ".")) { - STPUTC('/', new); - while (*p) - STPUTC(*p++, new); - } - } - if (new == stackblock()) - STPUTC('/', new); - STACKSTRNUL(new); - INTOFF; - if (prevdir) - ckfree(prevdir); - prevdir = curdir; - curdir = savestr(stackblock()); - setvar("PWD", curdir, VEXPORT|VTEXTFIXED); - INTON; -} - - - -int -pwdcmd(argc, argv) - int argc; - char **argv; -{ - getpwd(); - out1str(curdir); - out1c('\n'); - return 0; -} - - - - -#define MAXPWD 256 - -/* - * Find out what the current directory is. If we already know the current - * directory, this routine returns immediately. - */ -void -getpwd() -{ - char buf[MAXPWD]; - - if (curdir) - return; - /* - * Things are a bit complicated here; we could have just used - * getcwd, but traditionally getcwd is implemented using popen - * to /bin/pwd. This creates a problem for us, since we cannot - * keep track of the job if it is being ran behind our backs. - * So we re-implement getcwd(), and we suppress interrupts - * throughout the process. This is not completely safe, since - * the user can still break out of it by killing the pwd program. - * We still try to use getcwd for systems that we know have a - * c implementation of getcwd, that does not open a pipe to - * /bin/pwd. - */ -#if defined(__NetBSD__) || defined(__SVR4) - - if (getcwd(buf, sizeof(buf)) == NULL) { - char *pwd = getenv("PWD"); - struct stat stdot, stpwd; - - if (pwd && *pwd == '/' && stat(".", &stdot) != -1 && - stat(pwd, &stpwd) != -1 && - stdot.st_dev == stpwd.st_dev && - stdot.st_ino == stpwd.st_ino) { - curdir = savestr(pwd); - return; - } - error("getcwd() failed: %s", strerror(errno)); - } - curdir = savestr(buf); -#else - { - char *p; - int i; - int status; - struct job *jp; - int pip[2]; - - INTOFF; - if (pipe(pip) < 0) - error("Pipe call failed"); - jp = makejob((union node *)NULL, 1); - if (forkshell(jp, (union node *)NULL, FORK_NOJOB) == 0) { - (void) close(pip[0]); - if (pip[1] != 1) { - close(1); - copyfd(pip[1], 1); - close(pip[1]); - } - (void) execl("/bin/pwd", "pwd", (char *)0); - error("Cannot exec /bin/pwd"); - } - (void) close(pip[1]); - pip[1] = -1; - p = buf; - while ((i = read(pip[0], p, buf + MAXPWD - p)) > 0 - || (i == -1 && errno == EINTR)) { - if (i > 0) - p += i; - } - (void) close(pip[0]); - pip[0] = -1; - status = waitforjob(jp); - if (status != 0) - error((char *)0); - if (i < 0 || p == buf || p[-1] != '\n') - error("pwd command failed"); - p[-1] = '\0'; - } - curdir = savestr(buf); - INTON; -#endif -} |