There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
143 lines
2.9 KiB
C
143 lines
2.9 KiB
C
/* getcwd() - get the name of the current working directory.
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* Author: Kees J. Bot
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* 30 Apr 1989
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*/
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#define chdir _chdir
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#include <sys/cdefs.h>
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <limits.h>
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#include <string.h>
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/* libc-private interface */
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int __getcwd(char *, size_t);
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static int addpath(const char *path, char **ap, const char *entry)
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/* Add the name of a directory entry at the front of the path being built.
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* Note that the result always starts with a slash.
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*/
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{
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const char *e= entry;
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char *p= *ap;
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while (*e != 0) e++;
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while (e > entry && p > path) *--p = *--e;
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if (p == path) return -1;
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*--p = '/';
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*ap= p;
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return 0;
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}
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static int recover(char *p)
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/* Undo all those chdir("..")'s that have been recorded by addpath. This
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* has to be done entry by entry, because the whole pathname may be too long.
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*/
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{
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int e= errno, slash;
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char *p0;
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while (*p != 0) {
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p0= ++p;
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do p++; while (*p != 0 && *p != '/');
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slash= *p; *p= 0;
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if (chdir(p0) < 0) return -1;
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*p= slash;
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}
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errno= e;
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return 0;
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}
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int __getcwd(char *path, size_t size)
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{
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struct stat above, current, tmp;
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struct dirent *entry;
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DIR *d;
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char *p, *up;
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const char *dotdot = "..";
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int cycle;
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if (path == NULL || size <= 1) { errno= EINVAL; return -1; }
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p= path + size;
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*--p = 0;
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if (stat(".", ¤t) < 0) return -1;
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while (1) {
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if (stat(dotdot, &above) < 0) { recover(p); return -1; }
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if (above.st_dev == current.st_dev
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&& above.st_ino == current.st_ino)
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break; /* Root dir found */
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if ((d= opendir(dotdot)) == NULL) { recover(p); return -1; }
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/* Cycle is 0 for a simple inode nr search, or 1 for a search
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* for inode *and* device nr.
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*/
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cycle= above.st_dev == current.st_dev ? 0 : 1;
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do {
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char name[3 + NAME_MAX + 1];
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tmp.st_ino= 0;
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if ((entry= readdir(d)) == NULL) {
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switch (++cycle) {
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case 1:
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rewinddir(d);
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continue;
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case 2:
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closedir(d);
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errno= ENOENT;
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recover(p);
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return -1;
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}
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}
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if (strcmp(entry->d_name, ".") == 0) continue;
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if (strcmp(entry->d_name, "..") == 0) continue;
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switch (cycle) {
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case 0:
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/* Simple test on inode nr. */
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if (entry->d_ino != current.st_ino) continue;
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/*FALL THROUGH*/
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case 1:
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/* Current is mounted. */
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strcpy(name, "../");
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strcpy(name+3, entry->d_name);
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if (stat(name, &tmp) < 0) continue;
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break;
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}
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} while (tmp.st_ino != current.st_ino
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|| tmp.st_dev != current.st_dev);
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up= p;
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if (addpath(path, &up, entry->d_name) < 0) {
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closedir(d);
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errno = ERANGE;
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recover(p);
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return -1;
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}
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closedir(d);
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if (chdir(dotdot) < 0) { recover(p); return -1; }
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p= up;
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current= above;
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}
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if (recover(p) < 0) return -1; /* Undo all those chdir("..")'s. */
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if (*p == 0) *--p = '/'; /* Cwd is "/" if nothing added */
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if (p > path) strcpy(path, p); /* Move string to start of path. */
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return 0;
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}
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