diff options
Diffstat (limited to 'src/os.h')
| -rw-r--r-- | src/os.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/src/os.h b/src/os.h new file mode 100644 index 0000000..c74d2d0 --- /dev/null +++ b/src/os.h @@ -0,0 +1,145 @@ +/* + * Copyright © 2021 Michael Smith <mikesmiffy128@gmail.com> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR + * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +#ifndef INC_OS_H +#define INC_OS_H + +#include <stdbool.h> + +/* + * Here we declare an absolute ton of wrappers, macros, compatibility shims, + * reimplementations and so on to try in vain to sweep the inconsistencies + * between Windows and not-Windows under the rug. + * + * If this file gets any bigger it might need to be split up a bit... + */ + +#include <fcntl.h> +#ifdef _WIN32 +#define NOMINMAX +#define WIN32_LEAN_AND_MEAN +#include <io.h> +#include <wchar.h> +#include <Windows.h> +#else +#include <dlfcn.h> +#include <limits.h> +#include <sys/mman.h> +#include <unistd.h> +#endif + +#include "intdefs.h" + +#ifdef _WIN32 + +#define IMPORT __declspec(dllimport) // only needed for variables +#define EXPORT __declspec(dllexport) +void *os_dlsym(void *mod, const char *sym); +#define os_char ushort +#define _OS_CAT(L, x) L##x +#define OS_LIT(x) _OS_CAT(L, x) +#define os_snprintf _snwprintf +#define os_strchr wcschr +#define os_strcmp wcscmp +#define os_strcpy wcscpy +#define os_strlen wcslen +#define strncasecmp _strnicmp // stupid! +#define OS_DLSUFFIX ".dll" +#ifndef PATH_MAX +// XXX win32/crt has this dumb 260 limit even though the actual kernel imposes +// no limit (though apparently NTFS has a limit of 65535). Theoerically we could +// do some memes with UNC paths to extend it to at least have parity with Unix +// PATH_MAX (4096), but for now we just kind of accept that Windows is a +// disaster. +#define PATH_MAX MAX_PATH +#endif +#define os_fopen _wfopen +// yuck :( +#define _os_open3(path, flags, mode) _wopen((path), (flags) | _O_BINARY, (mode)) +#define _os_open2(path, flags) _wopen((path), (flags) | _O_BINARY) +#define _os_open(a, b, c, x, ...) x +#define os_open(...) _os_open(__VA_ARGS__, _os_open3, _os_open2, _)(__VA_ARGS__) +#define os_access _waccess +#define os_stat _stat64 +// ucrt defines __stat64 to _stat64. we want _wstat64 to be the actual function +#define _stat64(path, buf) _wstat64(path, buf) +// why exactly _does_ windows prefix so many things with underscores? +#define read _read +#define write _write +#define close _close +#define O_RDONLY _O_RDONLY +#define O_RDWR _O_RDWR +#define O_CLOEXEC _O_NOINHERIT +#define O_CREAT _O_CREAT +#define O_EXCL _O_EXCL +#define F_OK 0 +#define R_OK 4 +#define W_OK 2 +#define X_OK R_OK // there's no actual X bit +#define alloca _alloca +#define os_getenv _wgetenv +#define OS_MAIN wmain +// just dump this boilerplate here as well, I spose +#define OS_WINDOWS_ERROR(arrayname) \ + FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, 0, GetLastError(), \ + MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), arrayname, \ + sizeof(arrayname), 0) + +#else + +#ifdef __GNUC__ +#define EXPORT __attribute__((visibility("default"))) +#else +#define EXPORT int novis[-!!"visibility attribute requires Clang or GCC"]; +#endif +#define IMPORT +#define os_dlsym dlsym +#define os_char char +#define OS_LIT(x) x +#define os_snprintf snprintf +#define os_strchr strchr +#define os_strcmp strcmp +#define os_strcpy strcpy +#define os_strlen strlen +#define OS_DLSUFFIX ".so" +#define os_fopen fopen +#define os_open open +#define os_access access +#define os_stat stat +// unix mprot flags are much nicer but cannot be defined in terms of the windows +// ones, so we use the windows ones and define them in terms of the unix ones. +// another victory for stupid! +#define PAGE_NOACCESS 0 +#define PAGE_READONLY PROT_READ +#define PAGE_READWRITE PROT_READ | PROT_WRITE +#define PAGE_EXECUTE_READ PROT_READ | PROT_EXEC +#define PAGE_EXECUTE_READWRITE PROT_READ | PROT_WRITE | PROT_EXEC +#define os_getenv getenv +#define OS_MAIN main + +#endif + +bool os_mprot(void *addr, int len, int fl); +/* + * NOTE: this should be called with a reasonably small buffer (e.g., the size of + * a private key). The maximum size of the buffer on Linux is 256, on Windows + * it's God Knows What. + */ +void os_randombytes(void *buf, int len); + +#endif + +// vi: sw=4 ts=4 noet tw=80 cc=80 |