1 files changed, 37 insertions, 0 deletions
diff --git a/src/libstddjb/mininetstring_write.c b/src/libstddjb/mininetstring_write.c
new file mode 100644
index 0000000..6b31f17
--- /dev/null
+++ b/src/libstddjb/mininetstring_write.c
@@ -0,0 +1,37 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <skalibs/uint16.h>
+#include <skalibs/uint32.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/mininetstring.h>
+
+int mininetstring_write (int fd, char const *s, uint16 len, uint32 *w)
+{
+  if (!w)
+  {
+    char pack[2] ;
+    uint16_pack_big(pack, len) ;
+    switch (fd_write(fd, pack, 2))
+    {
+      case -1 : return -1 ;
+      case 0 : return (errno = EAGAIN, -1) ;
+      case 1 : *w = (1U << 31) ; break ;
+      case 2 : *w = len ; break ;
+      default : return (errno = EDOM, -1) ;
+    }
+  }
+  if (*w & (1U << 31))
+  {
+    char c = len & 0xFFU ;
+    switch (fd_write(fd, &c, 1))
+    {
+      case -1 : return -1 ;
+      case 0 : return (errno = EAGAIN, -1) ;
+      case 1 : *w = len ; break ;
+      default : return (errno = EDOM, -1) ;
+    }
+  }
+  *w -= allwrite(fd, s + len - *w, *w) ;
+  return *w ? -1 : 1 ;
+}