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/* Two PD getcwd() implementations.
   Author: Guido van Rossum, CWI Amsterdam, Jan 1991, <guido@cwi.nl>. */
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_GETWD
/* Version for BSD systems -- use getwd() */
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
extern char *getwd(char *);
getcwd(char *buf, int size)
	char localbuf[MAXPATHLEN+1];
	char *ret;
	if (size <= 0) {
		errno = EINVAL;
		return NULL;
	ret = getwd(localbuf);
	if (ret != NULL && strlen(localbuf) >= (size_t)size) {
		errno = ERANGE;
		return NULL;
	if (ret == NULL) {
		errno = EACCES; /* Most likely error */
		return NULL;
	strncpy(buf, localbuf, size);
	return buf;
#else /* !HAVE_GETWD */
/* Version for really old UNIX systems -- use pipe from pwd */
#ifndef PWD_CMD
#define PWD_CMD "/bin/pwd"
getcwd(char *buf, int size)
	if (size <= 0) {
		errno = EINVAL;
		return NULL;
	if ((fp = popen(PWD_CMD, "r")) == NULL)
		return NULL;
	if (fgets(buf, size, fp) == NULL || (sts = pclose(fp)) != 0) {
		errno = EACCES; /* Most likely error */
		return NULL;
	for (p = buf; *p != '\n'; p++) {
		if (*p == '\0') {
			errno = ERANGE;
			return NULL;
	*p = '\0';
	return buf;
#endif /* !HAVE_GETWD */

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