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Added version that opens a pipe to /bin/pwd.

This commit is contained in:
Guido van Rossum 1991-02-19 12:28:18 +00:00
parent 426035c543
commit 7927384a1d
1 changed files with 47 additions and 4 deletions
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51
Python/getcwd.c
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@ -1,10 +1,19 @@
/* Quick hack to get posix.getcwd() working for pure BSD 4.3 */ /* Two PD getcwd() implementations.
Author: Guido van Rossum, CWI Amsterdam, Jan 1991, <guido@cwi.nl>. */
#include "sys/param.h" /* #define NO_GETWD /* Turn this on to popen pwd instead of calling getwd() */
#include "errno.h"
#include <stdio.h>
#include <errno.h>
extern int errno; extern int errno;
#ifndef NO_GETWD
/* Default: Version for BSD systems -- use getwd() */
#include "sys/param.h"
extern char *getwd(); extern char *getwd();
char * char *
@ -32,4 +41,38 @@ getcwd(buf, size)
return buf; return buf;
} }
/* PS: for really old systems you must popen /bin/pwd ... */ #else
/* NO_GETWD defined: Version for backward UNIXes -- popen /bin/pwd */
#define PWD_CMD "/bin/pwd"
char *
getcwd(buf, size)
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