a209c3ae12
This patch fixes most of current reasons to generate compiler warnings.
The changes consist of:
- adding missing casts
- hiding or unhiding function declarations
- including headers where missing
- add __UNCONST when assigning a const char * to a char *
- adding missing return statements
- changing some types from unsigned to signed, as the code seems to want
signed ints
- converting old-style function definitions to current style (i.e.,
void func(param1, param2) short param1, param2; {...} to
void func (short param1, short param2) {...})
- making the compiler silent about signed vs unsigned comparisons. We
have too many of those in the new libc to fix.
A number of bugs in the test set were fixed. These bugs were never
triggered with our old libc. Consequently, these tests are now forced to
link with the new libc or they will generate errors (in particular tests 43
and 55).
Most changes in NetBSD libc are limited to moving aroudn "#ifndef __minix"
or stuff related to Minix-specific things (code in sys-minix or gen/minix).
144 lines
2.9 KiB
C
144 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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