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authormidipix <writeonce@midipix.org>2024-04-29 02:39:30 +0000
committermidipix <writeonce@midipix.org>2024-05-07 20:07:25 +0000
commit02e59c946d51faf976a85610e44d7b0ccf4a6e59 (patch)
tree660056e01b242e947e27c470b9989c7b1ae6b2b7 /src/driver/tbnf_map_input.c
parente9098c5591f439cdf8a923c9298b8fc7ff28a3ac (diff)
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driver: created program skeleton.
Diffstat (limited to 'src/driver/tbnf_map_input.c')
-rw-r--r--src/driver/tbnf_map_input.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/src/driver/tbnf_map_input.c b/src/driver/tbnf_map_input.c
new file mode 100644
index 0000000..629672a
--- /dev/null
+++ b/src/driver/tbnf_map_input.c
@@ -0,0 +1,66 @@
+/**************************************************************/
+/* treebnf: a tree oriented bnf library */
+/* Copyright (C) 2024 SysDeer Technologies, LLC */
+/* Released under GPLv2 and GPLv3; see COPYING.TREEBNF. */
+/**************************************************************/
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <treebnf/treebnf.h>
+#include "treebnf_driver_impl.h"
+#include "treebnf_errinfo_impl.h"
+
+int tbnf_lib_map_raw_input(
+ const struct tbnf_driver_ctx * dctx,
+ int fd,
+ const char * path,
+ int prot,
+ struct tbnf_raw_input * map)
+{
+ int ret;
+ struct stat st;
+ bool fnew;
+ int fdcwd;
+
+ fdcwd = tbnf_driver_fdcwd(dctx);
+
+ if ((fnew = (fd < 0)))
+ fd = openat(fdcwd,path,O_RDONLY | O_CLOEXEC);
+
+ if (fd < 0)
+ return TBNF_SYSTEM_ERROR(dctx,path);
+
+ if ((ret = fstat(fd,&st) < 0) && fnew)
+ close(fd);
+
+ else if ((st.st_size == 0) && fnew)
+ close(fd);
+
+ if (ret < 0)
+ return TBNF_SYSTEM_ERROR(dctx,path);
+
+ else if (st.st_size == 0)
+ return TBNF_CUSTOM_ERROR(
+ dctx,TBNF_ERR_IMAGE_SIZE_ZERO);
+
+ map->map_size = st.st_size;
+ map->map_addr = mmap(0,map->map_size,prot,MAP_PRIVATE,fd,0);
+
+ if (fnew)
+ close(fd);
+
+ return (map->map_addr == MAP_FAILED)
+ ? TBNF_SYSTEM_ERROR(dctx,0)
+ : 0;
+}
+
+int tbnf_lib_unmap_raw_input(struct tbnf_raw_input * map)
+{
+ return munmap(map->map_addr,map->map_size);
+}