1 files changed, 82 insertions, 0 deletions
diff --git a/Python/getcwd.c b/Python/getcwd.c
new file mode 100644
index 0000000..44dc9e6
--- /dev/null
+++ b/Python/getcwd.c
@@ -0,0 +1,82 @@
+
+/* 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
+#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;
+    if (size <= 0) {
+        errno = EINVAL;
+        return NULL;
+    }
+    if ((fp = popen(PWD_CMD, "r")) == NULL)
+        return NULL;
+    if (fgets(buf, size, fp) == NULL || 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 */