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

test/libc/runtime/getdosenviron_test.c

@@ -25,9 +25,9 @@ TEST(GetDosEnviron, testOneVariable) {
 #define kEnv u"A=Und wird die Welt auch in Flammen stehen\0"
   size_t max = 2;
   size_t size = sizeof(kEnv) >> 1;
-  char *block = malloc(size);
-  char16_t *env = memcpy(malloc(sizeof(kEnv)), kEnv, sizeof(kEnv));
-  char **envp = malloc(max * sizeof(char *));
+  char *block = calloc(1, size);
+  char16_t *env = memcpy(calloc(1, sizeof(kEnv)), kEnv, sizeof(kEnv));
+  char **envp = calloc(1, max * sizeof(char *));
   EXPECT_EQ(1, GetDosEnviron(env, block, size, envp, max));
   EXPECT_STREQ("A=Und wird die Welt auch in Flammen stehen", envp[0]);
   EXPECT_EQ(NULL, envp[1]);
@@ -44,9 +44,9 @@ TEST(GetDosEnviron, testTwoVariables) {
    u"𐌴𐌵𐌶𐌷=Wir werden wieder auferstehen\0")
   size_t max = 3;
   size_t size = 1024;
-  char *block = malloc(size);
-  char16_t *env = memcpy(malloc(sizeof(kEnv)), kEnv, sizeof(kEnv));
-  char **envp = malloc(max * sizeof(char *));
+  char *block = calloc(1, size);
+  char16_t *env = memcpy(calloc(1, sizeof(kEnv)), kEnv, sizeof(kEnv));
+  char **envp = calloc(1, max * sizeof(char *));
   EXPECT_EQ(2, GetDosEnviron(env, block, size, envp, max));
   EXPECT_STREQ("𐌰𐌱𐌲𐌳=Und wird die Welt auch in Flammen stehen", envp[0]);
   EXPECT_STREQ("𐌴𐌵𐌶𐌷=Wir werden wieder auferstehen", envp[1]);
@@ -61,9 +61,9 @@ TEST(GetDosEnviron, testOverrun_truncatesWithGrace) {
 #define kEnv u"A=Und wird die Welt auch in Flammen stehen\0"
   size_t max = 2;
   size_t size = sizeof(kEnv) >> 2;
-  char *block = malloc(size);
-  char16_t *env = memcpy(malloc(sizeof(kEnv)), kEnv, sizeof(kEnv));
-  char **envp = malloc(max * sizeof(char *));
+  char *block = calloc(1, size);
+  char16_t *env = memcpy(calloc(1, sizeof(kEnv)), kEnv, sizeof(kEnv));
+  char **envp = calloc(1, max * sizeof(char *));
   EXPECT_EQ(1, GetDosEnviron(env, block, size, envp, max));
   EXPECT_STREQ("A=Und wird die Welt ", envp[0]);
   EXPECT_EQ(NULL, envp[1]);
@@ -80,7 +80,7 @@ TEST(GetDosEnviron, testEmpty_doesntTouchMemory) {
 
 TEST(GetDosEnviron, testEmpty_zeroTerminatesWheneverPossible_1) {
   size_t max = 1;
-  char **envp = malloc(max * sizeof(char *));
+  char **envp = calloc(1, max * sizeof(char *));
   EXPECT_EQ(0, GetDosEnviron(u"", NULL, 0, envp, max));
   EXPECT_EQ(NULL, envp[0]);
   free(envp);
@@ -88,7 +88,7 @@ TEST(GetDosEnviron, testEmpty_zeroTerminatesWheneverPossible_1) {
 
 TEST(GetDosEnviron, testEmpty_zeroTerminatesWheneverPossible_2) {
   size_t size = 1;
-  char *block = malloc(size);
+  char *block = calloc(1, size);
   EXPECT_EQ(0, GetDosEnviron(u"", block, size, NULL, 0));
   EXPECT_BINEQ(u" ", block);
   free(block);
@@ -96,7 +96,7 @@ TEST(GetDosEnviron, testEmpty_zeroTerminatesWheneverPossible_2) {
 
 TEST(GetDosEnviron, testEmpty_zeroTerminatesWheneverPossible_3) {
   size_t size = 2;
-  char *block = malloc(size);
+  char *block = calloc(1, size);
   EXPECT_EQ(0, GetDosEnviron(u"", block, size, NULL, 0));
   EXPECT_BINEQ(u" ", block);
   free(block);