Undiamond Python headers

This change gets the Python codebase into a state where it conforms to
the conventions of this codebase. It's now possible to include headers
from Python, without worrying about ordering. Python has traditionally
solved that problem by "diamonding" everything in Python.h, but that's
problematic since it means any change to any Python header invalidates
all the build artifacts. Lastly it makes tooling not work. Since it is
hard to explain to Emacs when I press C-c C-h to add an import line it
shouldn't add the header that actually defines the symbol, and instead
do follow the nonstandard Python convention.

Progress has been made on letting Python load source code from the zip
executable structure via the standard C library APIs. System calss now
recognizes zip!FILENAME alternative URIs as equivalent to zip:FILENAME
since Python uses colon as its delimiter.

Some progress has been made on embedding the notice license terms into
the Python object code. This is easier said than done since Python has
an extremely complicated ownership story.

- Some termios APIs have been added
- Implement rewinddir() dirstream API
- GetCpuCount() API added to Cosmopolitan Libc
- More bugs in Cosmopolitan Libc have been fixed
- zipobj.com now has flags for mangling the path
- Fixed bug a priori with sendfile() on certain BSDs
- Polyfill F_DUPFD and F_DUPFD_CLOEXEC across platforms
- FIOCLEX / FIONCLEX now polyfilled for fast O_CLOEXEC changes
- APE now supports a hybrid solution to no-self-modify for builds
- Many BSD-only magnums added, e.g. O_SEARCH, O_SHLOCK, SF_NODISKIO

third_party/python/Modules/zipimport.c

@@ -1,9 +1,32 @@
-/* clang-format off */
-#include "third_party/python/Include/Python.h"
-#include "third_party/python/Include/structmember.h"
-#include "third_party/python/Include/osdefs.h"
-#include "third_party/python/Include/marshal.h"
+#include "libc/bits/bits.h"
+#include "libc/calls/calls.h"
+#include "libc/calls/weirdtypes.h"
 #include "libc/time/struct/tm.h"
+#include "libc/time/time.h"
+#include "third_party/python/Include/abstract.h"
+#include "third_party/python/Include/boolobject.h"
+#include "third_party/python/Include/bytesobject.h"
+#include "third_party/python/Include/code.h"
+#include "third_party/python/Include/compile.h"
+#include "third_party/python/Include/dictobject.h"
+#include "third_party/python/Include/fileutils.h"
+#include "third_party/python/Include/import.h"
+#include "third_party/python/Include/longobject.h"
+#include "third_party/python/Include/marshal.h"
+#include "third_party/python/Include/modsupport.h"
+#include "third_party/python/Include/objimpl.h"
+#include "third_party/python/Include/osdefs.h"
+#include "third_party/python/Include/patchlevel.h"
+#include "third_party/python/Include/pgenheaders.h"
+#include "third_party/python/Include/pydebug.h"
+#include "third_party/python/Include/pyerrors.h"
+#include "third_party/python/Include/pymem.h"
+#include "third_party/python/Include/pystate.h"
+#include "third_party/python/Include/pythonrun.h"
+#include "third_party/python/Include/structmember.h"
+#include "third_party/python/Include/sysmodule.h"
+#include "third_party/python/Include/unicodeobject.h"
+/* clang-format off */
 
 #define IS_SOURCE   0x0
 #define IS_BYTECODE 0x1
@@ -828,32 +851,6 @@ static PyTypeObject ZipImporter_Type = {
 
 /* implementation */
 
-/* Given a buffer, return the unsigned int that is represented by the first
-   4 bytes, encoded as little endian. This partially reimplements
-   marshal.c:r_long() */
-static unsigned int
-get_uint32(const unsigned char *buf)
-{
-    unsigned int x;
-    x =  buf[0];
-    x |= (unsigned int)buf[1] <<  8;
-    x |= (unsigned int)buf[2] << 16;
-    x |= (unsigned int)buf[3] << 24;
-    return x;
-}
-
-/* Given a buffer, return the unsigned int that is represented by the first
-   2 bytes, encoded as little endian. This partially reimplements
-   marshal.c:r_short() */
-static unsigned short
-get_uint16(const unsigned char *buf)
-{
-    unsigned short x;
-    x =  buf[0];
-    x |= (unsigned short)buf[1] <<  8;
-    return x;
-}
-
 static void
 set_file_error(PyObject *archive, int eof)
 {
@@ -925,14 +922,14 @@ read_directory(PyObject *archive)
     if (fread(buffer, 1, 22, fp) != 22) {
         goto file_error;
     }
-    if (get_uint32(buffer) != 0x06054B50u) {
+    if (READ32LE(buffer) != 0x06054B50u) {
         /* Bad: End of Central Dir signature */
         errmsg = "not a Zip file";
         goto invalid_header;
     }
 
-    header_size = get_uint32(buffer + 12);
-    header_offset = get_uint32(buffer + 16);
+    header_size = READ32LE(buffer + 12);
+    header_offset = READ32LE(buffer + 16);
     if (header_position < header_size) {
         errmsg = "bad central directory size";
         goto invalid_header;
@@ -967,25 +964,25 @@ read_directory(PyObject *archive)
             goto eof_error;
         }
         /* Start of file header */
-        if (get_uint32(buffer) != 0x02014B50u) {
+        if (READ32LE(buffer) != 0x02014B50u) {
             break;              /* Bad: Central Dir File Header */
         }
         if (n != 46) {
             goto eof_error;
         }
-        flags = get_uint16(buffer + 8);
-        compress = get_uint16(buffer + 10);
-        time = get_uint16(buffer + 12);
-        date = get_uint16(buffer + 14);
-        crc = get_uint32(buffer + 16);
-        data_size = get_uint32(buffer + 20);
-        file_size = get_uint32(buffer + 24);
-        name_size = get_uint16(buffer + 28);
+        flags = READ16LE(buffer + 8);
+        compress = READ16LE(buffer + 10);
+        time = READ16LE(buffer + 12);
+        date = READ16LE(buffer + 14);
+        crc = READ32LE(buffer + 16);
+        data_size = READ32LE(buffer + 20);
+        file_size = READ32LE(buffer + 24);
+        name_size = READ16LE(buffer + 28);
         header_size = (unsigned int)name_size +
-           get_uint16(buffer + 30) /* extra field */ +
-           get_uint16(buffer + 32) /* comment */;
+           READ16LE(buffer + 30) /* extra field */ +
+           READ16LE(buffer + 32) /* comment */;
 
-        file_offset = get_uint32(buffer + 42);
+        file_offset = READ32LE(buffer + 42);
         if (file_offset > header_offset) {
             errmsg = "bad local header offset";
             goto invalid_header;
@@ -1161,15 +1158,15 @@ get_data(PyObject *archive, PyObject *toc_entry)
     if (fread(buffer, 1, 30, fp) != 30) {
         goto eof_error;
     }
-    if (get_uint32(buffer) != 0x04034B50u) {
+    if (READ32LE(buffer) != 0x04034B50u) {
         /* Bad: Local File Header */
         errmsg = "bad local file header";
         goto invalid_header;
     }
 
     header_size = (unsigned int)30 +
-        get_uint16(buffer + 26) /* file name */ +
-        get_uint16(buffer + 28) /* extra field */;
+        READ16LE(buffer + 26) /* file name */ +
+        READ16LE(buffer + 28) /* extra field */;
     if (file_offset > LONG_MAX - header_size) {
         errmsg = "bad local file header size";
         goto invalid_header;
@@ -1282,7 +1279,7 @@ unmarshal_code(PyObject *pathname, PyObject *data, time_t mtime)
         return NULL;
     }
 
-    if (get_uint32(buf) != (unsigned int)PyImport_GetMagicNumber()) {
+    if (READ32LE(buf) != (unsigned int)PyImport_GetMagicNumber()) {
         if (Py_VerboseFlag) {
             PySys_FormatStderr("# %R has bad magic\n",
                                pathname);
@@ -1291,7 +1288,7 @@ unmarshal_code(PyObject *pathname, PyObject *data, time_t mtime)
         return Py_None;  /* signal caller to try alternative */
     }
 
-    if (mtime != 0 && !eq_mtime(get_uint32(buf + 4), mtime)) {
+    if (mtime != 0 && !eq_mtime(READ32LE(buf + 4), mtime)) {
         if (Py_VerboseFlag) {
             PySys_FormatStderr("# %R has bad mtime\n",
                                pathname);