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-rw-r--r--src/helper/slbt_map_input.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/src/helper/slbt_map_input.c b/src/helper/slbt_map_input.c
new file mode 100644
index 0000000..5cd7774
--- /dev/null
+++ b/src/helper/slbt_map_input.c
@@ -0,0 +1,67 @@
+/*******************************************************************/
+/* slibtool: a skinny libtool implementation, written in C */
+/* Copyright (C) 2015--2023 SysDeer Technologies, LLC */
+/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
+/*******************************************************************/
+
+#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 <slibtool/slibtool.h>
+#include "slibtool_driver_impl.h"
+#include "slibtool_errinfo_impl.h"
+
+int slbt_map_input(
+ const struct slbt_driver_ctx * dctx,
+ int fd,
+ const char * path,
+ int prot,
+ struct slbt_input * map)
+{
+ int ret;
+ struct stat st;
+ bool fnew;
+ int fdcwd;
+
+ fdcwd = slbt_driver_fdcwd(dctx);
+
+ if ((fnew = (fd < 0)))
+ fd = openat(fdcwd,path,O_RDONLY | O_CLOEXEC);
+
+ if (fd < 0)
+ return SLBT_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 SLBT_SYSTEM_ERROR(dctx,path);
+
+ if (st.st_size == 0) {
+ map->size = 0;
+ map->addr = 0;
+ } else {
+ map->size = st.st_size;
+ map->addr = mmap(0,map->size,prot,MAP_PRIVATE,fd,0);
+ }
+
+ if (fnew)
+ close(fd);
+
+ return (map->addr == MAP_FAILED)
+ ? SLBT_SYSTEM_ERROR(dctx,path)
+ : 0;
+}
+
+int slbt_unmap_input(struct slbt_input * map)
+{
+ return map->size ? munmap(map->addr,map->size) : 0;
+}