mirror of
https://github.com/python/cpython.git
synced 2024-11-25 19:03:49 +08:00
80 lines
1.3 KiB
C
80 lines
1.3 KiB
C
|
|
/* 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>
|
|
#endif
|
|
|
|
#ifndef MAXPATHLEN
|
|
#define MAXPATHLEN 1024
|
|
#endif
|
|
|
|
extern char *getwd(char *);
|
|
|
|
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"
|
|
#endif
|
|
|
|
char *
|
|
getcwd(char *buf, int size)
|
|
{
|
|
FILE *fp;
|
|
char *p;
|
|
int sts;
|
|
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 */
|