Make numerous improvements

- Python static hello world now 1.8mb
- Python static fully loaded now 10mb
- Python HTTPS client now uses MbedTLS
- Python REPL now completes import stmts
- Increase stack size for Python for now
- Begin synthesizing posixpath and ntpath
- Restore Python \N{UNICODE NAME} support
- Restore Python NFKD symbol normalization
- Add optimized code path for Intel SHA-NI
- Get more Python unit tests passing faster
- Get Python help() pagination working on NT
- Python hashlib now supports MbedTLS PBKDF2
- Make memcpy/memmove/memcmp/bcmp/etc. faster
- Add Mersenne Twister and Vigna to LIBC_RAND
- Provide privileged __printf() for error code
- Fix zipos opendir() so that it reports ENOTDIR
- Add basic chmod() implementation for Windows NT
- Add Cosmo's best functions to Python cosmo module
- Pin function trace indent depth to that of caller
- Show memory diagram on invalid access in MODE=dbg
- Differentiate stack overflow on crash in MODE=dbg
- Add stb_truetype and tools for analyzing font files
- Upgrade to UNICODE 13 and reduce its binary footprint
- COMPILE.COM now logs resource usage of build commands
- Start implementing basic poll() support on bare metal
- Set getauxval(AT_EXECFN) to GetModuleFileName() on NT
- Add descriptions to strerror() in non-TINY build modes
- Add COUNTBRANCH() macro to help with micro-optimizations
- Make error / backtrace / asan / memory code more unbreakable
- Add fast perfect C implementation of μ-Law and a-Law audio codecs
- Make strtol() functions consistent with other libc implementations
- Improve Linenoise implementation (see also github.com/jart/bestline)
- COMPILE.COM now suppresses stdout/stderr of successful build commands

libc/stdio/appendr.c

@@ -65,7 +65,7 @@ ssize_t appendr(char **b, size_t i) {
       }
     }
     if (i > z.i) {
-      memset(p + z.i, 0, i - z.i + 1);
+      bzero(p + z.i, i - z.i + 1);
     } else {
       p[i] = 0;
     }

libc/stdio/dirstream.c

@@ -192,7 +192,7 @@ static textwindows uint8_t GetNtDirentType(struct NtWin32FindData *w) {
 static textwindows noinline struct dirent *readdir_nt(DIR *dir) {
   size_t i;
   if (!dir->isdone) {
-    memset(&dir->ent, 0, sizeof(dir->ent));
+    bzero(&dir->ent, sizeof(dir->ent));
     dir->ent.d_ino++;
     dir->ent.d_off = dir->tell++;
     dir->ent.d_reclen =
@@ -230,24 +230,34 @@ static textwindows noinline struct dirent *readdir_nt(DIR *dir) {
 DIR *opendir(const char *name) {
   int fd;
   DIR *res;
+  struct stat st;
   struct Zipos *zip;
   struct ZiposUri zipname;
   if (weaken(__zipos_get) && weaken(__zipos_parseuri)(name, &zipname) != -1) {
     ZTRACE("__zipos_opendir(%`'s)", name);
-    zip = weaken(__zipos_get)();
-    res = calloc(1, sizeof(DIR));
-    res->iszip = true;
-    res->fd = -1;
-    res->zip.offset = GetZipCdirOffset(zip->cdir);
-    res->zip.records = GetZipCdirRecords(zip->cdir);
-    res->zip.prefix = malloc(zipname.len + 2);
-    memcpy(res->zip.prefix, zipname.path, zipname.len);
-    if (zipname.len && res->zip.prefix[zipname.len - 1] != '/') {
-      res->zip.prefix[zipname.len++] = '/';
+    if (weaken(__zipos_stat)(&zipname, &st) != -1) {
+      if (S_ISDIR(st.st_mode)) {
+        zip = weaken(__zipos_get)();
+        res = calloc(1, sizeof(DIR));
+        res->iszip = true;
+        res->fd = -1;
+        res->zip.offset = GetZipCdirOffset(zip->cdir);
+        res->zip.records = GetZipCdirRecords(zip->cdir);
+        res->zip.prefix = malloc(zipname.len + 2);
+        memcpy(res->zip.prefix, zipname.path, zipname.len);
+        if (zipname.len && res->zip.prefix[zipname.len - 1] != '/') {
+          res->zip.prefix[zipname.len++] = '/';
+        }
+        res->zip.prefix[zipname.len] = '\0';
+        res->zip.prefixlen = zipname.len;
+        return res;
+      } else {
+        errno = ENOTDIR;
+        return 0;
+      }
+    } else {
+      return 0;
     }
-    res->zip.prefix[zipname.len] = '\0';
-    res->zip.prefixlen = zipname.len;
-    return res;
   } else if (!IsWindows()) {
     res = NULL;
     if ((fd = open(name, O_RDONLY | O_DIRECTORY | O_CLOEXEC)) != -1) {

libc/stdio/fopen.c

@@ -59,7 +59,7 @@ FILE *fopen(const char *pathname, const char *mode) {
   FILE *f;
   bool noclose;
   int fd, flags;
-  SYSDEBUG("fopen(%`'s)", pathname);
+  SYSDEBUG("fopen(%s)", pathname);
   flags = fopenflags(mode);
   pathname = fixpathname(pathname, flags);
   if ((fd = openpathname(pathname, flags, &noclose)) != -1) {

libc/stdio/internal.h

@@ -14,6 +14,7 @@ extern char g_stderrbuf[BUFSIZ];
 int __fflush_impl(FILE *) hidden;
 int __fflush_register(FILE *) hidden;
 void __fflush_unregister(FILE *) hidden;
+bool __stdio_isok(FILE *) hidden;
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */