Make smart_ulltoa return pointer to end (allows for code shink in callers)

function                                             old     new   delta
smart_ulltoa5                                        405     408      +3
smart_ulltoa4                                        273     276      +3
list_table                                          1113    1114      +1
scale                                                 36      34      -2
put_lu                                                55      53      -2
ulltoa6_and_space                                     19      14      -5
powertop_main                                       1470    1461      -9

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

7 files changed, 14 insertions, 20 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 6b95dc0ec..1315e5f8f 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -815,8 +815,8 @@ char *itoa(int n) FAST_FUNC;
 char *utoa_to_buf(unsigned n, char *buf, unsigned buflen) FAST_FUNC;
 char *itoa_to_buf(int n, char *buf, unsigned buflen) FAST_FUNC;
 /* Intelligent formatters of bignums */
-void smart_ulltoa4(unsigned long long ul, char buf[4], const char *scale) FAST_FUNC;
-void smart_ulltoa5(unsigned long long ul, char buf[5], const char *scale) FAST_FUNC;
+char *smart_ulltoa4(unsigned long long ul, char buf[4], const char *scale) FAST_FUNC;
+char *smart_ulltoa5(unsigned long long ul, char buf[5], const char *scale) FAST_FUNC;
 /* If block_size == 0, display size without fractional part,
  * else display (size * block_size) with one decimal digit.
  * If display_unit == 0, show value no bigger than 1024 with suffix (K,M,G...),
diff --git a/libbb/human_readable.c b/libbb/human_readable.c
index 8b22b0cb5..0b2eb777e 100644
--- a/libbb/human_readable.c
+++ b/libbb/human_readable.c
@@ -94,7 +94,7 @@ const char* FAST_FUNC make_human_readable_str(unsigned long long val,
 
 /* Convert unsigned long long value into compact 5-char representation.
  * String is not terminated (buf[5] is untouched) */
-void FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[5], const char *scale)
+char* FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[5], const char *scale)
 {
         const char *fmt;
         char c;
@@ -145,12 +145,13 @@ void FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[5], const char *sca
                 buf[3] = "0123456789"[v];
                 buf[4] = scale[idx]; /* typically scale = " kmgt..." */
         }
+        return buf + 5;
 }
 
 /* Convert unsigned long long value into compact 4-char
  * representation. Examples: "1234", "1.2k", " 27M", "123T"
  * String is not terminated (buf[4] is untouched) */
-void FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[4], const char *scale)
+char* FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[4], const char *scale)
 {
         const char *fmt;
         char c;
@@ -194,4 +195,5 @@ void FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[4], const char *sca
                 buf[2] = "0123456789"[v];
                 buf[3] = scale[idx]; /* typically scale = " kmgt..." */
         }
+        return buf + 4;
 }
diff --git a/procps/nmeter.c b/procps/nmeter.c
index 6a3b32743..5d5b83b8d 100644
--- a/procps/nmeter.c
+++ b/procps/nmeter.c
@@ -333,8 +333,7 @@ static void scale(ullong ul)
         char buf[5];
 
         /* see http://en.wikipedia.org/wiki/Tera */
-        smart_ulltoa4(ul, buf, " kmgtpezy");
-        buf[4] = '\0';
+        smart_ulltoa4(ul, buf, " kmgtpezy")[0] = '\0';
         put(buf);
 }
 
diff --git a/procps/powertop.c b/procps/powertop.c
index 71988a295..e3c29d1c3 100644
--- a/procps/powertop.c
+++ b/procps/powertop.c
@@ -627,7 +627,6 @@ static void show_timerstats(void)
                 int i, n = 0;
                 char strbuf6[6];
 
-                strbuf6[5] = '\0';
                 puts("\nTop causes for wakeups:");
                 for (i = 0; i < G.lines_cnt; i++) {
                         if ((G.lines[i].count > 0 /*|| G.lines[i].disk_count > 0*/)
@@ -639,7 +638,7 @@ static void show_timerstats(void)
                                 /*char c = ' ';
                                 if (G.lines[i].disk_count)
                                         c = 'D';*/
-                                smart_ulltoa5(G.lines[i].count, strbuf6, " KMGTPEZY");
+                                smart_ulltoa5(G.lines[i].count, strbuf6, " KMGTPEZY")[0] = '\0';
                                 printf(/*" %5.1f%% (%s)%c  %s\n"*/
                                         " %5.1f%% (%s)   %s\n",
                                         G.lines[i].count * 100.0 / G.lines_cumulative_count,
diff --git a/procps/ps.c b/procps/ps.c
index 89cadad00..c65fa012a 100644
--- a/procps/ps.c
+++ b/procps/ps.c
@@ -299,8 +299,7 @@ static void put_lu(char *buf, int size, unsigned long u)
         char buf4[5];
 
         /* see http://en.wikipedia.org/wiki/Tera */
-        smart_ulltoa4(u, buf4, " mgtpezy");
-        buf4[4] = '\0';
+        smart_ulltoa4(u, buf4, " mgtpezy")[0] = '\0';
         sprintf(buf, "%.*s", size, buf4);
 }
 
@@ -740,8 +739,7 @@ int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
 #endif
                 {
                         char buf6[6];
-                        smart_ulltoa5(p->vsz, buf6, " mgtpezy");
-                        buf6[5] = '\0';
+                        smart_ulltoa5(p->vsz, buf6, " mgtpezy")[0] = '\0';
 #if ENABLE_FEATURE_PS_LONG
                         if (opts & OPT_l) {
                                 char bufr[6], stime_str[6];
@@ -752,8 +750,7 @@ int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
                                 time_t start = now - elapsed;
                                 struct tm *tm = localtime(&start);
 
-                                smart_ulltoa5(p->rss, bufr, " mgtpezy");
-                                bufr[5] = '\0';
+                                smart_ulltoa5(p->rss, bufr, " mgtpezy")[0] = '\0';
 
                                 if (p->tty_major == 136)
                                         /* It should be pts/N, not ptsN, but N > 9
diff --git a/procps/top.c b/procps/top.c
index abee69806..a13a41cd8 100644
--- a/procps/top.c
+++ b/procps/top.c
@@ -847,8 +847,7 @@ static void display_topmem_header(int scr_width, int *lines_rem_p)
 static void ulltoa6_and_space(unsigned long long ul, char buf[6])
 {
         /* see http://en.wikipedia.org/wiki/Tera */
-        smart_ulltoa5(ul, buf, " mgtpezy");
-        buf[5] = ' ';
+        smart_ulltoa5(ul, buf, " mgtpezy")[0] = '\0';
 }
 
 static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
diff --git a/util-linux/fdisk_gpt.c b/util-linux/fdisk_gpt.c
index f45f68af0..5786d5f7d 100644
--- a/util-linux/fdisk_gpt.c
+++ b/util-linux/fdisk_gpt.c
@@ -93,9 +93,7 @@ gpt_list_table(int xtra UNUSED_PARAM)
         int i;
         char numstr6[6];
 
-        numstr6[5] = '\0';
-
-        smart_ulltoa5(total_number_of_sectors * sector_size, numstr6, " KMGTPEZY");
+        smart_ulltoa5(total_number_of_sectors * sector_size, numstr6, " KMGTPEZY")[0] = '\0';
         printf("Disk %s: %llu sectors, %s\n", disk_device,
                 (unsigned long long)total_number_of_sectors,
                 numstr6);
@@ -113,7 +111,7 @@ gpt_list_table(int xtra UNUSED_PARAM)
                 gpt_partition *p = gpt_part(i);
                 if (p->lba_start) {
                         smart_ulltoa5((1 + SWAP_LE64(p->lba_end) - SWAP_LE64(p->lba_start)) * sector_size,
-                                numstr6, " KMGTPEZY");
+                                numstr6, " KMGTPEZY")[0] = '\0';
                         printf("%4u %15llu %15llu %11s   %04x  ",
                                 i + 1,
                                 (unsigned long long)SWAP_LE64(p->lba_start),