1 files changed, 53 insertions, 0 deletions
diff --git a/src/libs6rc/s6rc_db_read_sizes.c b/src/libs6rc/s6rc_db_read_sizes.c
new file mode 100644
index 0000000..4d1537f
--- /dev/null
+++ b/src/libs6rc/s6rc_db_read_sizes.c
@@ -0,0 +1,53 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <skalibs/uint32.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/buffer.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/unix-transactional.h>
+#include <s6-rc/s6rc-db.h>
+
+static inline int s6rc_db_read_sizes_buffer (buffer *b, s6rc_db_t *db)
+{
+  uint32 x ;
+  if (!s6rc_db_read_uint32(b, &x)) return 0 ;
+  db->nshort = x ;
+  if (!s6rc_db_read_uint32(b, &x)) return 0 ;
+  db->nlong = x ;
+  if (!s6rc_db_read_uint32(b, &x)) return 0 ;
+  db->stringlen = x ;
+  if (!s6rc_db_read_uint32(b, &x)) return 0 ;
+  db->nargvs = x ;
+  if (!s6rc_db_read_uint32(b, &x)) return 0 ;
+  db->ndeps = x ;
+  return 1 ;
+}
+
+int s6rc_db_read_sizes (int fdcompiled, s6rc_db_t *db)
+{
+  char buf[64] ;
+  buffer b ;
+  int fd = open_readatb(fdcompiled, "n") ;
+  if (fd < 0) return 0 ;
+  buffer_init(&b, &fd_readsv, fd, buf, 64) ;
+  if (!s6rc_db_read_sizes_buffer(&b, db))
+  {
+    fd_close(fd) ;
+    return 0 ;
+  }
+  {
+    char c ;
+    register int r = buffer_get(&b, &c, 1) ;
+    if (r < 0)
+    {
+      r = errno ;
+      fd_close(fd) ;
+      errno = r ;
+      return 0 ;
+    }
+    fd_close(fd) ;
+    if (r) return 0 ;
+  }
+  return 1 ;
+}