Make improvements to cosmocc toolchain

examples/date.c

@@ -7,15 +7,66 @@
 │   • http://creativecommons.org/publicdomain/zero/1.0/            │
 ╚─────────────────────────────────────────────────────────────────*/
 #endif
-#include "libc/mem/gc.h"
-#include "libc/stdio/stdio.h"
-#include "libc/x/xiso8601.h"
+#include "libc/calls/calls.h"
+#include "libc/calls/struct/timespec.h"
+#include "libc/str/str.h"
+#include "libc/time/struct/tm.h"
 
 /**
- * @fileoverview ISO-8601 international high-precision timestamp printer.
+ * @fileoverview High performance ISO-8601 timestamp formatter.
  */
 
-int main(int argc, char *argv[]) {
-  puts(_gc(xiso8601ts(NULL)));
-  return 0;
+char *GetTimestamp(void) {
+  int x;
+  struct timespec ts;
+  _Thread_local static long last;
+  _Thread_local static char s[27];
+  _Thread_local static struct tm tm;
+  clock_gettime(0, &ts);
+  if (ts.tv_sec != last) {
+    localtime_r(&ts.tv_sec, &tm);
+    x = tm.tm_year + 1900;
+    s[0] = '0' + x / 1000;
+    s[1] = '0' + x / 100 % 10;
+    s[2] = '0' + x / 10 % 10;
+    s[3] = '0' + x % 10;
+    s[4] = '-';
+    x = tm.tm_mon + 1;
+    s[5] = '0' + x / 10;
+    s[6] = '0' + x % 10;
+    s[7] = '-';
+    x = tm.tm_mday;
+    s[8] = '0' + x / 10;
+    s[9] = '0' + x % 10;
+    s[10] = 'T';
+    x = tm.tm_hour;
+    s[11] = '0' + x / 10;
+    s[12] = '0' + x % 10;
+    s[13] = ':';
+    x = tm.tm_min;
+    s[14] = '0' + x / 10;
+    s[15] = '0' + x % 10;
+    s[16] = ':';
+    x = tm.tm_sec;
+    s[17] = '0' + x / 10;
+    s[18] = '0' + x % 10;
+    s[19] = '.';
+    s[26] = 0;
+    last = ts.tv_sec;
+  }
+  x = ts.tv_nsec;
+  s[20] = '0' + x / 100000000;
+  s[21] = '0' + x / 10000000 % 10;
+  s[22] = '0' + x / 1000000 % 10;
+  s[23] = '0' + x / 100000 % 10;
+  s[24] = '0' + x / 10000 % 10;
+  s[25] = '0' + x / 1000 % 10;
+  return s;
+}
+
+int main(int argc, char *argv[]) {
+  char buf[128], *p = buf;
+  p = stpcpy(p, GetTimestamp());
+  p = stpcpy(p, "\n");
+  write(1, buf, p - buf);
 }