1 files changed, 26 insertions, 0 deletions
diff --git a/src/libstddjb/realpath_tmp.c b/src/libstddjb/realpath_tmp.c
new file mode 100644
index 0000000..8f877dd
--- /dev/null
+++ b/src/libstddjb/realpath_tmp.c
@@ -0,0 +1,26 @@
+/* ISC license. */
+
+#include <limits.h>
+#include <errno.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+#ifndef PATH_MAX
+# define PATH_MAX 4095
+#endif
+
+char *realpath_tmp (char const *name, char *buf, stralloc *tmp)
+{
+  unsigned int tmpbase = tmp->len ;
+  if (sarealpath(tmp, name) == -1) return (char *)0 ;
+  if (tmp->len - tmpbase > PATH_MAX)
+  {
+    tmp->len = tmpbase ;
+    return (errno = ENAMETOOLONG, (char *)0) ;
+  }
+  byte_copy(buf, tmp->len - tmpbase, tmp->s + tmpbase) ;
+  buf[tmp->len - tmpbase] = 0 ;
+  tmp->len = tmpbase ;
+  return buf ;
+}