diff options
| -rw-r--r-- | include/slibtool/slibtool.h | 12 | ||||
| -rw-r--r-- | project/common.mk | 1 | ||||
| -rw-r--r-- | src/helper/slbt_map_input.c | 67 |
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; +} |