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authormidipix <writeonce@midipix.org>2023-02-12 02:00:22 +0000
committermidipix <writeonce@midipix.org>2023-02-12 02:10:00 +0000
commite99ba2eb5565de921f4f589bf6991e0ac3cdf2a0 (patch)
tree9a204ae2f374fd0e5c0e21e9644a5d25a20a9ee2
parent2f5700dd80bf64e0a4314beb7d9a7f35a11996a4 (diff)
downloadslibtool-e99ba2eb5565de921f4f589bf6991e0ac3cdf2a0.tar.bz2
slibtool-e99ba2eb5565de921f4f589bf6991e0ac3cdf2a0.tar.xz
helper: added slbt_map_input(), slbt_unmap_input().
-rw-r--r--include/slibtool/slibtool.h12
-rw-r--r--project/common.mk1
-rw-r--r--src/helper/slbt_map_input.c67
3 files changed, 80 insertions, 0 deletions
diff --git a/include/slibtool/slibtool.h b/include/slibtool/slibtool.h
index ee34b9a..ca32efe 100644
--- a/include/slibtool/slibtool.h
+++ b/include/slibtool/slibtool.h
@@ -125,6 +125,11 @@ enum slbt_warning_level {
SLBT_WARNING_LEVEL_NONE,
};
+struct slbt_input {
+ void * addr;
+ size_t size;
+};
+
struct slbt_source_version {
int major;
int minor;
@@ -268,6 +273,13 @@ struct slbt_driver_ctx {
void * any;
};
+/* raw input api */
+slbt_api int slbt_map_input (const struct slbt_driver_ctx *,
+ int, const char *, int,
+ struct slbt_input *);
+
+slbt_api int slbt_unmap_input (struct slbt_input *);
+
/* driver api */
slbt_api int slbt_get_driver_ctx (char ** argv, char ** envp, uint32_t flags,
const struct slbt_fd_ctx *,
diff --git a/project/common.mk b/project/common.mk
index 4893b49..31d0ff4 100644
--- a/project/common.mk
+++ b/project/common.mk
@@ -4,6 +4,7 @@ API_SRCS = \
src/helper/slbt_archive_import.c \
src/helper/slbt_copy_file.c \
src/helper/slbt_dump_machine.c \
+ src/helper/slbt_map_input.c \
src/helper/slbt_realpath.c \
src/logic/slbt_exec_compile.c \
src/logic/slbt_exec_ctx.c \
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;
+}