initial checkin for strftime(3) test program

lib/libc/tests/stdtime/strftime.c

@@ -0,0 +1,89 @@
+#include <stdio.h>
+#include <time.h>
+
+const char *formats[] = {
+  "%A",
+  "%a",
+  "%B",
+  "%b",
+  "%C",
+  "%c",
+  "%D",
+  "%d",
+#if 1
+  "%Ec",
+  "%EC",
+  "%Ex",
+  "%Ey",
+  "%EY",
+#endif
+  "%e",
+  "%H",
+  "%h",
+  "%I",
+  "%j",
+  "%k",
+  "%l",
+  "%M",
+  "%m",
+  "%n",
+#if 1
+  "%Od",
+  "%Oe",
+  "%OH",
+  "%OI",
+  "%Om",
+  "%OM",
+  "%OS",
+  "%Ou",
+  "%OU",
+  "%OV",
+  "%Ow",
+  "%OW",
+  "%Oy",
+#endif
+  "%p",
+  "%R",
+  "%r",
+  "%S",
+  "%s",
+  "%T",
+  "%t",
+  "%U",
+  "%u",
+  "%V",
+  "%v",
+  "%W",
+  "%w",
+  "%x",
+  "%Y",
+  "%y",
+  "%Z",
+  "%+",
+  "%%",
+  /* This is the format used in getty(1) */
+  "%l:%M%p on %A, %d %B %Y",
+  NULL
+};
+
+#define BUFFERSIZE 1024
+static char buffer[BUFFERSIZE];
+
+int main (int argc, char **argv) {
+  static struct tm *tmptr;
+  time_t timeval;
+  int i;
+  size_t result;
+
+  time(&timeval);
+  tmptr = localtime(&timeval);
+
+  printf("SEED = %ld\n", timeval);
+
+  for (i=0; formats[i] != NULL; i++) {
+    result = strftime(buffer, BUFFERSIZE-1, formats[i], tmptr);
+    printf("%s\t%ld\t%s\n", formats[i], result, buffer);
+  }
+  return 0;
+}
+