1 files changed, 27 insertions, 0 deletions
diff --git a/src/libstddjb/sagetcwd.c b/src/libstddjb/sagetcwd.c
new file mode 100644
index 0000000..d8c5dea
--- /dev/null
+++ b/src/libstddjb/sagetcwd.c
@@ -0,0 +1,27 @@
+/* ISC license. */
+
+#include <unistd.h>
+#include <errno.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+int sagetcwd (stralloc *sa)
+{
+  unsigned int n = 128 ;
+  int wasnull = !sa->s ;
+
+  for (;;)
+  {
+    if (!stralloc_readyplus(sa, n)) goto err ;
+    if (getcwd(sa->s + sa->len, n)) break ;
+    if (errno != ERANGE) goto err ;
+    n += 128 ;
+  }
+  sa->len += str_len(sa->s + sa->len) ;
+  return 0 ;
+
+err:
+  if (wasnull) stralloc_free(sa) ;
+  return -1 ;
+}