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authorEric Andersen <andersen@codepoet.org>2000-10-30 21:42:41 +0000
committerEric Andersen <andersen@codepoet.org>2000-10-30 21:42:41 +0000
commit643d28471fd2f87e85a06875754c57e122bb4848 (patch)
treefd923b0b385a67fb06fa225bf4ce4483d09d6339 /libc/unistd
parent48b5bb26b950baaf7303a81d32cde8c031003ba7 (diff)
getcwd did not include the alloc-space-as-needed-on-NULL-buffer
feature which busybox needed. So I added it.
Diffstat (limited to 'libc/unistd')
-rw-r--r--libc/unistd/getcwd.c28
1 files changed, 16 insertions, 12 deletions
diff --git a/libc/unistd/getcwd.c b/libc/unistd/getcwd.c
index 12eda45ca..c0be5c39e 100644
--- a/libc/unistd/getcwd.c
+++ b/libc/unistd/getcwd.c
@@ -1,13 +1,10 @@
-
+#include <stdlib.h>
#include <errno.h>
#include <sys/stat.h>
#include <dirent.h>
#include <string.h>
-/*
- * These functions find the absolute path to the current working directory.
- *
- * They don't use malloc or large amounts of stack space.
- */
+
+/* These functions find the absolute path to the current working directory. */
static char *recurser(); /* Routine to go up tree */
static char *search_dir(); /* Routine to find the step back down */
@@ -19,21 +16,28 @@ static ino_t root_ino;
static struct stat st;
-char *getcwd(buf, size)
-char *buf;
-int size;
+char *getcwd( char *buf, int size)
{
- path_buf = buf;
path_size = size;
if (size < 3) {
errno = ERANGE;
- return 0;
+ return NULL;
}
+
+ if (buf != NULL)
+ path_buf = buf;
+ else
+ {
+ path_buf = malloc (size);
+ if (path_buf == NULL)
+ return NULL;
+ }
+
strcpy(path_buf, ".");
if (stat("/", &st) < 0)
- return 0;
+ return NULL;
root_dev = st.st_dev;
root_ino = st.st_ino;