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/*
* Copyright (c) 2008-2010 Wind River Systems; see
* guts/COPYRIGHT for information.
*
* static char *
* wrap_getcwd(char *buf, size_t size) {
* char * rc = NULL;
*/
pseudo_debug(3, "wrap_getcwd: %p, %lu\n",
(void *) buf, (unsigned long) size);
if (!pseudo_cwd) {
pseudo_diag("Asked for CWD, but don't have it!\n");
errno = EACCES;
return NULL;
}
/* emulate Linux semantics in case of non-Linux systems. */
if (!buf) {
/* if we don't have a cwd, something's very wrong... */
if (!size) {
size = pseudo_cwd_len + 1;
if (pseudo_chroot_len && size >= pseudo_chroot_len &&
!memcmp(pseudo_cwd, pseudo_chroot, pseudo_chroot_len)) {
size -= pseudo_chroot_len;
/* if cwd is precisely the same as chroot, we
* actually want a /, not an empty string
*/
if (size < 2)
size = 2;
}
}
if (size) {
buf = malloc(size);
} else {
pseudo_diag("can't figure out CWD: length %ld + 1 - %ld => %ld\n",
(unsigned long) pseudo_cwd_len,
(unsigned long) pseudo_chroot_len,
(unsigned long) size);
}
if (!buf) {
pseudo_diag("couldn't allocate requested CWD buffer - need %ld byes\n",
(unsigned long) size);
errno = ENOMEM;
return NULL;
}
}
if (pseudo_cwd_len - (pseudo_cwd_rel - pseudo_cwd) >= size) {
pseudo_debug(1, "only %ld bytes available, need %ld (%ld + 1 - %ld)\n",
(unsigned long) size,
(unsigned long) pseudo_cwd_len + 1 - pseudo_chroot_len,
(unsigned long) pseudo_cwd_len,
(unsigned long) pseudo_chroot_len);
errno = ERANGE;
return NULL;
}
rc = buf;
pseudo_debug(3, "getcwd: copying %d (%d + 1 - %d) characters from <%s>.\n",
(int) ((pseudo_cwd_len + 1) - pseudo_chroot_len),
(int) pseudo_cwd_len, (int) pseudo_chroot_len,
pseudo_cwd_rel);
memcpy(buf, pseudo_cwd_rel, (pseudo_cwd_len + 1) - (pseudo_cwd_rel - pseudo_cwd));
if (!*buf) {
strcpy(buf, "/");
}
/* return rc;
* }
*/
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