Finally implement sarealpath() over realpath(). Prettier atomic_symlink().

1 files changed, 26 insertions, 0 deletions

diff --git a/src/libstddjb/sarealpath.c b/src/libstddjb/sarealpath.c
new file mode 100644
index 0000000..0cf1825
--- /dev/null
+++ b/src/libstddjb/sarealpath.c
@@ -0,0 +1,26 @@
+/* ISC license. */
+
+#include <string.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+int sarealpath (stralloc *sa, char const *path)
+{
+  if (sa->s)
+  {
+    if (!stralloc_readyplus(sa, PATH_MAX)) return -1 ;
+    if (!realpath(path, sa->s + sa->len)) return -1 ;
+    sa->len += strlen(sa->s + sa->len) ;
+  }
+  else
+  {
+    char *p = realpath(path, 0) ;
+    if (!p) return -1 ;
+    sa->s = p ;
+    sa->len = strlen(p) ;
+    sa->a = sa->len + 1 ;
+  }
+  return 0 ;
+}