tool_progress: fix large time outputs and decimal size display

Time output:

- was broken for really large times

- now uses spaces instead of --:--:--

- >99999y is now the largest shown time

- show HH:MM:SS as long as hours are fewer than 100

Size:

- made the decimal output always only use a single decimal

Test:

- Add test 1622 to verify these functions

Closes #20177

tests/tunit/Makefile.inc

@@ -32,4 +32,5 @@ FIRST_C = ../libtest/first.c
 TESTS_C = \
   tool1394.c \
   tool1604.c \
-  tool1621.c
+  tool1621.c \
+  tool1622.c

tests/tunit/tool1622.c

@@ -0,0 +1,75 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+#include "unitcheck.h"
+
+#include "tool_progress.h"
+
+static CURLcode test_tool1622(const char *arg)
+{
+  UNITTEST_BEGIN_SIMPLE
+  {
+    char buffer[9];
+    curl_off_t secs;
+    int i;
+    static const curl_off_t check[] = {
+      /* bytes to check */
+      131072,
+      12645826,
+      1073741824,
+      12938588979,
+      1099445657078333,
+      0 /* end of list */
+    };
+
+    puts("time2str");
+    for(i = 0, secs = 0; i < 63; i++) {
+      time2str(buffer, sizeof(buffer), secs);
+      curl_mprintf("%20" FMT_OFF_T " - %s\n", secs, buffer);
+      if(strlen(buffer) != 8) {
+        curl_mprintf("^^ was too long!\n");
+      }
+      secs *= 2;
+      secs++;
+    }
+    puts("max5data");
+    for(i = 0, secs = 0; i < 63; i++) {
+      max5data(secs, buffer, sizeof(buffer));
+      curl_mprintf("%20" FMT_OFF_T " - %s\n", secs, buffer);
+      if(strlen(buffer) != 5) {
+        curl_mprintf("^^ was too long!\n");
+      }
+      secs *= 2;
+      secs++;
+    }
+    for(i = 0; check[i]; i++) {
+      secs = check[i];
+      max5data(secs, buffer, sizeof(buffer));
+      curl_mprintf("%20" FMT_OFF_T " - %s\n", secs, buffer);
+      if(strlen(buffer) != 5) {
+        curl_mprintf("^^ was too long!\n");
+      }
+    }
+  }
+  UNITTEST_END_SIMPLE
+}