From d6f7078aab3050629a63d9b9d92f30e1ca5a9aa1 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Sat, 24 Jul 2021 15:04:18 +0000
Subject:  Add cdb_init_at and cdb_init_fromfd, rename cdb_reader

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 src/libstddjb/cdb_init_fromfd.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 src/libstddjb/cdb_init_fromfd.c

(limited to 'src/libstddjb/cdb_init_fromfd.c')

diff --git a/src/libstddjb/cdb_init_fromfd.c b/src/libstddjb/cdb_init_fromfd.c
new file mode 100644
index 0000000..7446f4a
--- /dev/null
+++ b/src/libstddjb/cdb_init_fromfd.c
@@ -0,0 +1,23 @@
+/* ISC license. */
+
+#include <skalibs/bsdsnowflake.h>
+
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <stdint.h>
+#include <errno.h>
+
+#include <skalibs/cdb.h>
+
+int cdb_init_fromfd (cdb *c, int fd)
+{
+  char *map ;
+  struct stat st ;
+  if (fstat(fd, &st) < 0) return 0 ;
+  if (st.st_size > UINT32_MAX) return (errno = EOVERFLOW, 0) ;
+  map = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0) ;
+  if (map == MAP_FAILED) return 0 ;
+  c->map = map ;
+  c->size = st.st_size ;
+  return 1 ;
+}
-- 
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