Clean up some code

- Use good ELF technique in cosmo_dlopen()
- Make strerror() conform more to other libc impls
- Introduce __clear_cache() and use it in cosmo_dlopen()
- Remove libc/fmt/fmt.h header (trying to kill off LIBC_FMT)

test/libc/fmt/formatbinary64_test.c

@@ -16,7 +16,6 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/fmt/fmt.h"
 #include "libc/fmt/itoa.h"
 #include "libc/str/str.h"
 #include "libc/testlib/ezbench.h"

test/libc/fmt/formatflex64_test.c

@@ -16,7 +16,6 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/fmt/fmt.h"
 #include "libc/fmt/itoa.h"
 #include "libc/str/str.h"
 #include "libc/testlib/testlib.h"

test/libc/fmt/formathex64_test.c

@@ -16,7 +16,6 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/fmt/fmt.h"
 #include "libc/fmt/itoa.h"
 #include "libc/str/str.h"
 #include "libc/testlib/ezbench.h"

test/libc/fmt/itoa64radix16_test.c

@@ -1,36 +0,0 @@
-/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
-│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
-╞══════════════════════════════════════════════════════════════════════════════╡
-│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
-│                                                                              │
-│ 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.                                                │
-╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/fmt/itoa.h"
-#include "libc/testlib/testlib.h"
-
-TEST(itoa64radix16, test) {
-  char buf[21];
-  EXPECT_EQ(5, uint64toarray_radix16(0x31337, buf));
-  EXPECT_STREQ("31337", buf);
-  EXPECT_EQ(2, uint64toarray_radix16(0x13, buf));
-  EXPECT_STREQ("13", buf);
-  EXPECT_EQ(3, uint64toarray_radix16(0x113, buf));
-  EXPECT_STREQ("113", buf);
-}
-
-TEST(itoa64fixed16, test) {
-  char buf[21];
-  EXPECT_EQ(8, uint64toarray_fixed16(0x31337, buf, 32));
-  EXPECT_STREQ("00031337", buf);
-}

test/libc/fmt/strerror_r_test.c

@@ -16,10 +16,9 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/intrin/bits.h"
 #include "libc/dce.h"
 #include "libc/errno.h"
-#include "libc/fmt/fmt.h"
+#include "libc/intrin/bits.h"
 #include "libc/str/str.h"
 #include "libc/testlib/testlib.h"
 
@@ -30,25 +29,25 @@
  */
 
 TEST(strerror, e2big) {
-  EXPECT_STARTSWITH("E2BIG", strerror(E2BIG));
+  EXPECT_STARTSWITH("Arg list too long", strerror(E2BIG));
 }
 
 TEST(strerror, enosys) {
-  EXPECT_STARTSWITH("ENOSYS", strerror(ENOSYS));
+  EXPECT_STARTSWITH("Function not implemented", strerror(ENOSYS));
 }
 
 TEST(strerror, einval) {
-  EXPECT_STARTSWITH("EINVAL", strerror(EINVAL));
+  EXPECT_STARTSWITH("Invalid argument", strerror(EINVAL));
 }
 
 TEST(strerror, symbolizingTheseNumbersAsErrorsIsHeresyInUnixStyle) {
-  EXPECT_STARTSWITH("EUNKNOWN", strerror(0));
+  EXPECT_STARTSWITH("No error information", strerror(0));
 }
 
 TEST(strerror, enotconn_orLinkerIsntUsingLocaleC_orCodeIsOutOfSync) {
-  EXPECT_STARTSWITH("ENOTCONN", strerror(ENOTCONN));
+  EXPECT_STARTSWITH("Transport endpoint is not connected", strerror(ENOTCONN));
 }
 
 TEST(strerror, exfull_orLinkerIsntUsingLocaleC_orCodeIsOutOfSync) {
-  EXPECT_STARTSWITH("ETXTBSY", strerror(ETXTBSY));
+  EXPECT_STARTSWITH("Text file busy", strerror(ETXTBSY));
 }

test/libc/fmt/stripexts_test.c

@@ -17,7 +17,6 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/fmt/conv.h"
-#include "libc/fmt/fmt.h"
 #include "libc/fmt/libgen.h"
 #include "libc/mem/gc.internal.h"
 #include "libc/testlib/testlib.h"