xz: Extend --robot --info-memory output.

Now it includes everything that the human-readable --info-memory shows.

src/xz/hardware.c

@@ -235,9 +235,22 @@ memlimit_show(const char *str, size_t str_columns, uint64_t value)
 extern void
 hardware_memlimit_show(void)
 {
+	uint32_t cputhreads = 1;
+#ifdef MYTHREAD_ENABLED
+	cputhreads = lzma_cputhreads();
+	if (cputhreads == 0)
+		cputhreads = 1;
+#endif
+
 	if (opt_robot) {
-		printf("%" PRIu64 "\t%" PRIu64 "\t%" PRIu64 "\n", total_ram,
-				memlimit_compress, memlimit_decompress);
+		printf("%" PRIu64 "\t%" PRIu64 "\t%" PRIu64 "\t%" PRIu64
+				"\t%" PRIu64 "\t%" PRIu32 "\n",
+				total_ram,
+				memlimit_compress,
+				memlimit_decompress,
+				hardware_memlimit_mtdec_get(),
+				memlimit_mt_default,
+				cputhreads);
 	} else {
 		const char *msgs[] = {
 			_("Amount of physical memory (RAM):"),
@@ -263,13 +276,6 @@ hardware_memlimit_show(void)
 				width_max = w;
 		}
 
-		uint32_t cputhreads = 1;
-#ifdef MYTHREAD_ENABLED
-		cputhreads = lzma_cputhreads();
-		if (cputhreads == 0)
-			cputhreads = 1;
-#endif
-
 		puts(_("Hardware information:"));
 		memlimit_show(msgs[0], width_max, total_ram);
 		printf("  %-*s  %" PRIu32 "\n",

src/xz/xz.1

@@ -5,7 +5,7 @@
 .\" This file has been put into the public domain.
 .\" You can do whatever you want with this file.
 .\"
-.TH XZ 1 "2022-10-25" "Tukaani" "XZ Utils"
+.TH XZ 1 "2022-11-07" "Tukaani" "XZ Utils"
 .
 .SH NAME
 xz, unxz, xzcat, lzma, unlzma, lzcat \- Compress or decompress .xz and .lzma files
@@ -1960,15 +1960,50 @@ and
 .B "xz \-\-robot \-\-info\-memory"
 prints a single line with three tab-separated columns:
 .IP 1. 4
-Total amount of physical memory (RAM) in bytes
+Total amount of physical memory (RAM) in bytes.
 .IP 2. 4
-Memory usage limit for compression in bytes.
-A special value of zero indicates the default setting,
+Memory usage limit for compression in bytes
+.RB ( \-\-memlimit\-compress ).
+A special value of
+.B 0
+indicates the default setting
 which for single-threaded mode is the same as no limit.
 .IP 3. 4
-Memory usage limit for decompression in bytes.
-A special value of zero indicates the default setting,
+Memory usage limit for decompression in bytes
+.RB ( \-\-memlimit\-decompress ).
+A special value of
+.B 0
+indicates the default setting
 which for single-threaded mode is the same as no limit.
+.IP 4. 4
+Since
+.B xz
+5.3.4alpha:
+Memory usage for multi-threaded decompression in bytes
+.RB ( \-\-memlimit\-mt\-decompress ).
+This is never zero because a system-specific default value
+shown in the column 5
+is used if no limit has been specified explicitly.
+This is also never greater than the value in the column 3
+even if a larger value has been specified with
+.BR \-\-memlimit\-mt\-decompress .
+.IP 5. 4
+Since
+.B xz
+5.3.4alpha:
+A system-specific default memory usage limit
+that is used to limit the number of threads
+when compressing with an automatic number of threads
+.RB ( \-\-threads=0 )
+and no memory usage limit has been specified
+.RB ( \-\-memlimit\-compress ).
+This is also used as the default value for
+.BR \-\-memlimit\-mt\-decompress .
+.IP 6. 4
+Since
+.B xz
+5.3.4alpha:
+Number of available processor threads.
 .PP
 In the future, the output of
 .B "xz \-\-robot \-\-info\-memory"