libbb: make bb_common_bufsiz1 1 kbyte, add capability to use bss tail for it

The config item is FEATURE_USE_BSS_TAIL. When it is off (default):

function                                             old     new   delta
read_config                                          210     228     +18
doCommands                                          2279    2294     +15
ipneigh_list_or_flush                                763     772      +9
ipaddr_list_or_flush                                1256    1261      +5
display_process_list                                1301    1306      +5
conspy_main                                         1378    1383      +5
do_lzo_compress                                      352     355      +3
do_lzo_decompress                                    565     567      +2
push                                                  46      44      -2
inetd_main                                          2136    2134      -2
uevent_main                                          421     418      -3
addLines                                              97      92      -5
bb_common_bufsiz1                                   8193    1024   -7169
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 8/5 up/down: 62/-7181)        Total: -7119 bytes
   text	   data	    bss	    dec	    hex	filename
 829850	   4086	   9080	 843016	  cdd08	busybox_old
 829901	   4086	   1904	 835891	  cc133	busybox_unstripped

FEATURE_USE_BSS_TAIL=y:

read_config                                          210     228     +18
doCommands                                          2279    2294     +15
ipneigh_list_or_flush                                763     772      +9
ipaddr_list_or_flush                                1256    1261      +5
display_process_list                                1301    1306      +5
conspy_main                                         1378    1383      +5
do_lzo_compress                                      352     355      +3
do_lzo_decompress                                    565     567      +2
inetd_main                                          2136    2134      -2
bb_common_bufsiz1                                   8193       -   -8193
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 8/1 up/down: 62/-8195)        Total: -8133 bytes
   text	   data	    bss	    dec	    hex	filename
 829850	   4086	   9080	 843016	  cdd08	busybox_old
 829911	   4086	    880	 834877	  cbd3d	busybox_unstripped

FIXME: setup_common_bufsiz() calls are missing.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

14 files changed, 34 insertions, 16 deletions

diff --git a/coreutils/catv.c b/coreutils/catv.c
index 6bb73ba63..801d2451d 100644
--- a/coreutils/catv.c
+++ b/coreutils/catv.c
@@ -19,6 +19,7 @@
 //usage:     "\n	-v	Don't use ^x or M-x escapes"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 #define CATV_OPT_e (1<<0)
 #define CATV_OPT_t (1<<1)
diff --git a/coreutils/cksum.c b/coreutils/cksum.c
index ac0b0c319..d8351e7c6 100644
--- a/coreutils/cksum.c
+++ b/coreutils/cksum.c
@@ -13,6 +13,7 @@
 //usage:       "Calculate the CRC32 checksums of FILES"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 /* This is a NOEXEC applet. Be very careful! */
 
@@ -42,8 +43,9 @@ int cksum_main(int argc UNUSED_PARAM, char **argv)
 		crc = 0;
 		length = 0;
 
-#define read_buf bb_common_bufsiz1
-		while ((bytes_read = safe_read(fd, read_buf, sizeof(read_buf))) > 0) {
+#define        read_buf bb_common_bufsiz1
+#define sizeof_read_buf COMMON_BUFSIZE
+		while ((bytes_read = safe_read(fd, read_buf, sizeof_read_buf)) > 0) {
 			length += bytes_read;
 			crc = crc32_block_endian1(crc, read_buf, bytes_read, crc32_table);
 		}
diff --git a/coreutils/date.c b/coreutils/date.c
index 7965775fe..59b4b8f2a 100644
--- a/coreutils/date.c
+++ b/coreutils/date.c
@@ -138,6 +138,7 @@
 //usage:       "Wed Apr 12 18:52:41 MDT 2000\n"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #if ENABLE_FEATURE_DATE_NANO
 # include <sys/syscall.h>
 #endif
@@ -367,7 +368,8 @@ int date_main(int argc UNUSED_PARAM, char **argv)
 	}
 #endif
 
-#define date_buf bb_common_bufsiz1
+#define        date_buf bb_common_bufsiz1
+#define sizeof_date_buf COMMON_BUFSIZE
 	if (*fmt_dt2str == '\0') {
 		/* With no format string, just print a blank line */
 		date_buf[0] = '\0';
@@ -377,7 +379,7 @@ int date_main(int argc UNUSED_PARAM, char **argv)
 			fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
 		}
 		/* Generate output string */
-		strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time);
+		strftime(date_buf, sizeof_date_buf, fmt_dt2str, &tm_time);
 	}
 	puts(date_buf);
 
diff --git a/coreutils/dd.c b/coreutils/dd.c
index 0c0ea07b9..a5b8882a0 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -91,6 +91,7 @@
 //usage:       "4+0 records out\n"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 /* This is a NOEXEC applet. Be very careful! */
 
@@ -108,7 +109,7 @@ struct globals {
 #endif
 	int flags;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { \
 	/* we have to zero it out because of NOEXEC */ \
 	memset(&G, 0, sizeof(G)); \
diff --git a/coreutils/du.c b/coreutils/du.c
index 1889c16bb..3d6777670 100644
--- a/coreutils/du.c
+++ b/coreutils/du.c
@@ -58,6 +58,7 @@
 //usage:       "2417    .\n"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 enum {
 	OPT_a_files_too    = (1 << 0),
@@ -85,7 +86,7 @@ struct globals {
 	int du_depth;
 	dev_t dir_dev;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { } while (0)
 
 
diff --git a/coreutils/expr.c b/coreutils/expr.c
index c986f9327..59a66d9c5 100644
--- a/coreutils/expr.c
+++ b/coreutils/expr.c
@@ -61,6 +61,7 @@
 //usage:       "of characters matched or 0."
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include "xregex.h"
 
 #if ENABLE_EXPR_MATH_SUPPORT_64
@@ -99,7 +100,7 @@ typedef struct valinfo VALUE;
 struct globals {
 	char **args;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { } while (0)
 
 /* forward declarations */
diff --git a/coreutils/ls.c b/coreutils/ls.c
index 20bd61860..e8c3e0490 100644
--- a/coreutils/ls.c
+++ b/coreutils/ls.c
@@ -93,6 +93,7 @@
 //usage:	)
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include "unicode.h"
 
 
@@ -365,7 +366,7 @@ struct globals {
 	time_t current_time_t;
 #endif
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { \
 	/* we have to zero it out because of NOEXEC */ \
 	memset(&G, 0, sizeof(G)); \
diff --git a/coreutils/od_bloaty.c b/coreutils/od_bloaty.c
index f47f84b54..1e252caf0 100644
--- a/coreutils/od_bloaty.c
+++ b/coreutils/od_bloaty.c
@@ -20,6 +20,7 @@
 
 
 /* #include "libbb.h" - done in od.c */
+#include "common_bufsiz.h"
 #define assert(a) ((void)0)
 
 
@@ -214,7 +215,7 @@ struct globals {
 #if !ENABLE_LONG_OPTS
 enum { G_pseudo_offset = 0 };
 #endif
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { \
 	BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
 	G.bytes_per_block = 32; \
diff --git a/coreutils/split.c b/coreutils/split.c
index 1e1673efb..b2da74e27 100644
--- a/coreutils/split.c
+++ b/coreutils/split.c
@@ -22,6 +22,7 @@
 //usage:       "$ cat TODO | split -a 2 -l 2 TODO_\n"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 #if ENABLE_FEATURE_SPLIT_FANCY
 static const struct suffix_mult split_suffixes[] = {
diff --git a/coreutils/stat.c b/coreutils/stat.c
index 1a490fef7..78df9c948 100644
--- a/coreutils/stat.c
+++ b/coreutils/stat.c
@@ -103,6 +103,7 @@
 //usage:	)
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 enum {
 	OPT_TERSE       = (1 << 0),
@@ -157,9 +158,10 @@ static const char *human_time(time_t t)
 	/* coreutils 6.3 compat: */
 
 	/*static char buf[sizeof("YYYY-MM-DD HH:MM:SS.000000000")] ALIGN1;*/
-#define buf bb_common_bufsiz1
+#define        buf bb_common_bufsiz1
+#define sizeof_buf COMMON_BUFSIZE
 
-	strcpy(strftime_YYYYMMDDHHMMSS(buf, sizeof(buf), &t), ".000000000");
+	strcpy(strftime_YYYYMMDDHHMMSS(buf, sizeof_buf, &t), ".000000000");
 	return buf;
 #undef buf
 }
diff --git a/coreutils/stty.c b/coreutils/stty.c
index b63b0b91a..0e32fc898 100644
--- a/coreutils/stty.c
+++ b/coreutils/stty.c
@@ -32,6 +32,7 @@
 //usage:     "\n	[SETTING]	See manpage"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 #ifndef _POSIX_VDISABLE
 # define _POSIX_VDISABLE ((unsigned char) 0)
@@ -775,7 +776,7 @@ struct globals {
 	unsigned current_col;
 	char buf[10];
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { \
 	G.device_name = bb_msg_standard_input; \
 	G.max_col = 80; \
diff --git a/coreutils/sum.c b/coreutils/sum.c
index deb068e10..cc6677221 100644
--- a/coreutils/sum.c
+++ b/coreutils/sum.c
@@ -21,6 +21,7 @@
 //usage:     "\n	-s	Use System V sum algorithm (512byte blocks)"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 enum { SUM_BSD, PRINT_NAME, SUM_SYSV };
 
@@ -41,7 +42,7 @@ static unsigned sum_file(const char *file, unsigned type)
 		return 0;
 
 	while (1) {
-		size_t bytes_read = safe_read(fd, buf, BUFSIZ);
+		size_t bytes_read = safe_read(fd, buf, COMMON_BUFSIZE);
 
 		if ((ssize_t)bytes_read <= 0) {
 			r = (fd && close(fd) != 0);
diff --git a/coreutils/tail.c b/coreutils/tail.c
index e352ab627..cdc9fb66a 100644
--- a/coreutils/tail.c
+++ b/coreutils/tail.c
@@ -49,12 +49,13 @@
 //usage:       "nameserver 10.0.0.1\n"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 struct globals {
 	bool from_top;
 	bool exitcode;
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { } while (0)
 
 static void tail_xprint_header(const char *fmt, const char *filename)
diff --git a/coreutils/tee.c b/coreutils/tee.c
index 48cc0508f..a0e177cbc 100644
--- a/coreutils/tee.c
+++ b/coreutils/tee.c
@@ -23,6 +23,7 @@
 //usage:       "Hello\n"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 int tee_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int tee_main(int argc, char **argv)
@@ -36,7 +37,8 @@ int tee_main(int argc, char **argv)
 //TODO: make unconditional
 #if ENABLE_FEATURE_TEE_USE_BLOCK_IO
 	ssize_t c;
-# define buf bb_common_bufsiz1
+# define        buf bb_common_bufsiz1
+# define sizeof_buf COMMON_BUFSIZE
 #else
 	int c;
 #endif
@@ -79,7 +81,7 @@ int tee_main(int argc, char **argv)
 	/* names[0] will be filled later */
 
 #if ENABLE_FEATURE_TEE_USE_BLOCK_IO
-	while ((c = safe_read(STDIN_FILENO, buf, sizeof(buf))) > 0) {
+	while ((c = safe_read(STDIN_FILENO, buf, sizeof_buf)) > 0) {
 		fp = files;
 		do
 			fwrite(buf, 1, c, *fp);