1 files changed, 41 insertions, 0 deletions
diff --git a/src/libtipidee/tipidee_fcgi_addenv.c b/src/libtipidee/tipidee_fcgi_addenv.c
new file mode 100644
index 0000000..fb9e859
--- /dev/null
+++ b/src/libtipidee/tipidee_fcgi_addenv.c
@@ -0,0 +1,41 @@
+/* ISC license. */
+
+#include <errno.h>
+
+#include <skalibs/uint32.h>
+#include <skalibs/stralloc.h>
+
+#include <tipidee/fcgi.h>
+
+static int encode (stralloc *sa, size_t n)
+{
+  if (n <= 0x7f)
+  {
+    char c = n ;
+    return stralloc_catb(sa, &c, 1) ;
+  }
+  else if (n < 0x7ffffffful)
+  {
+    char pack[4] ;
+    uint32_pack_big(pack, n | 0x80000000) ;
+    return stralloc_catb(sa, pack, 4) ;
+  }
+  else return (errno = EOVERFLOW, 0) ;
+}
+
+int tipidee_fcgi_addenvb (stralloc *sa, char const *key, size_t keylen, char const *val, size_t vallen)
+{
+  size_t start = sa->len ;
+  if (!encode(sa, keylen)) return 0 ;
+  if (!encode(sa, vallen)
+    || !stralloc_catb(sa, key, keylen)
+    || !stralloc_catb(sa, val, vallen)) goto err ;
+  if (sa->len > 0x7fff) goto err0 ;
+  return 1 ;
+
+ err0:
+  errno = E2BIG ;
+ err:
+  sa->len = start ;
+  return 0 ;
+}