[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit

Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/procps/free.c b/ap/app/busybox/src/procps/free.c
new file mode 100644
index 0000000..73a69c6
--- /dev/null
+++ b/ap/app/busybox/src/procps/free.c
@@ -0,0 +1,135 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini free implementation for busybox
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+
+/* getopt not needed */
+
+//usage:#define free_trivial_usage
+//usage:       "" IF_DESKTOP("[-b/k/m/g]")
+//usage:#define free_full_usage "\n\n"
+//usage:       "Display the amount of free and used system memory"
+//usage:
+//usage:#define free_example_usage
+//usage:       "$ free\n"
+//usage:       "              total         used         free       shared      buffers\n"
+//usage:       "  Mem:       257628       248724         8904        59644        93124\n"
+//usage:       " Swap:       128516         8404       120112\n"
+//usage:       "Total:       386144       257128       129016\n"
+
+#include "libbb.h"
+#ifdef __linux__
+# include <sys/sysinfo.h>
+#endif
+
+struct globals {
+	unsigned mem_unit;
+#if ENABLE_DESKTOP
+	uint8_t unit_steps;
+# define G_unit_steps g->unit_steps
+#else
+# define G_unit_steps 10
+#endif
+};
+/* Because of NOFORK, "globals" are not in global data */
+
+static unsigned long long scale(struct globals *g, unsigned long d)
+{
+	return ((unsigned long long)d * g->mem_unit) >> G_unit_steps;
+}
+
+/* NOINLINE reduces main() stack usage, which makes code smaller (on x86 at least) */
+static NOINLINE unsigned long parse_cached_kb(void)
+{
+	char buf[60]; /* actual lines we expect are ~30 chars or less */
+	FILE *fp;
+	unsigned long cached = 0;
+
+	fp = xfopen_for_read("/proc/meminfo");
+	while (fgets(buf, sizeof(buf), fp) != NULL) {
+		if (sscanf(buf, "Cached: %lu %*s\n", &cached) == 1)
+			break;
+	}
+	/* Have to close because of NOFORK */
+	fclose(fp);
+
+	return cached;
+}
+
+int free_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int free_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM))
+{
+	struct globals G;
+	struct sysinfo info;
+	unsigned long long cached;
+
+#if ENABLE_DESKTOP
+	G.unit_steps = 10;
+	if (argv[1] && argv[1][0] == '-') {
+		switch (argv[1][1]) {
+		case 'b':
+			G.unit_steps = 0;
+			break;
+		case 'k': /* 2^10 */
+			/* G.unit_steps = 10; - already is */
+			break;
+		case 'm': /* 2^(2*10) */
+			G.unit_steps = 20;
+			break;
+		case 'g': /* 2^(3*10) */
+			G.unit_steps = 30;
+			break;
+		default:
+			bb_show_usage();
+		}
+	}
+#endif
+	printf("       %11s%11s%11s%11s%11s%11s\n"
+	"Mem:   ",
+		"total",
+		"used",
+		"free",
+		"shared", "buffers", "cached" /* swap and total don't have these columns */
+	);
+
+	sysinfo(&info);
+	/* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
+	G.mem_unit = (info.mem_unit ? info.mem_unit : 1);
+	/* Extract cached from /proc/meminfo and convert to mem_units */
+	cached = ((unsigned long long) parse_cached_kb() * 1024) / G.mem_unit;
+
+#define FIELDS_6 "%11llu%11llu%11llu%11llu%11llu%11llu\n"
+#define FIELDS_3 (FIELDS_6 + 3*6)
+#define FIELDS_2 (FIELDS_6 + 4*6)
+
+	printf(FIELDS_6,
+		scale(&G, info.totalram),                //total
+		scale(&G, info.totalram - info.freeram), //used
+		scale(&G, info.freeram),                 //free
+		scale(&G, info.sharedram),               //shared
+		scale(&G, info.bufferram),               //buffers
+		scale(&G, cached)                        //cached
+	);
+	/* Show alternate, more meaningful busy/free numbers by counting
+	 * buffer cache as free memory. */
+	printf("-/+ buffers/cache:");
+	cached += info.freeram;
+	cached += info.bufferram;
+	printf(FIELDS_2,
+		scale(&G, info.totalram - cached), //used
+		scale(&G, cached)                  //free
+	);
+#if BB_MMU
+	printf("Swap:  ");
+	printf(FIELDS_3,
+		scale(&G, info.totalswap),                 //total
+		scale(&G, info.totalswap - info.freeswap), //used
+		scale(&G, info.freeswap)                   //free
+	);
+#endif
+	return EXIT_SUCCESS;
+}