python/Python/getcwd.c at master · java66liu/python · GitHub

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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>

#endif

#ifndef MAXPATHLEN

#if defined(PATH_MAX) && PATH_MAX > 1024

#define MAXPATHLEN PATH_MAX

#else

#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 */

python/Python/getcwd.c at master · java66liu/python · GitHub

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