smart_ulltoa5: make available in libbb

diff --git a/include/libbb.h b/include/libbb.h
index 6074331..8c1d784 100644 (file)
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -278,6 +278,7 @@ extern FILE *fopen_or_warn(const char *filename, const char *mode);
 extern FILE *fopen_or_warn_stdin(const char *filename);
 
 
+extern void smart_ulltoa5(unsigned long long ul, char buf[5]);
 extern void utoa_to_buf(unsigned n, char *buf, unsigned buflen);
 extern char *utoa(unsigned n);
 extern void itoa_to_buf(int n, char *buf, unsigned buflen);

diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index c722650..352515a 100644 (file)
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -201,23 +201,71 @@ void xsetenv(const char *key, const char *value)
                bb_error_msg_and_die(bb_msg_memory_exhausted);
 }
 
+
+// Converts unsigned long long value into compact 4-char
+// representation. Examples: "1234", "1.2k", " 27M", "123T"
+// Fifth char is always '\0'
+void smart_ulltoa5(unsigned long long ul, char buf[5])
+{
+       char *fmt;
+       char c;
+       unsigned v,idx = 0;
+       ul *= 10;
+       if (ul > 9999*10) { // do not scale if 9999 or less
+               while (ul >= 10000) {
+                       ul /= 1024;
+                       idx++;
+               }
+       }
+       v = ul; // ullong divisions are expensive, avoid them
+
+       fmt = " 123456789";
+       if (!idx) {             // 9999 or less: use 1234 format
+               c = buf[0] = " 123456789"[v/10000];
+               if (c!=' ') fmt = "0123456789";
+               c = buf[1] = fmt[v/1000%10];
+               if (c!=' ') fmt = "0123456789";
+               buf[2] = fmt[v/100%10];
+               buf[3] = "0123456789"[v/10%10];
+       } else {
+               if (v>=10*10) { // scaled value is >=10: use 123M format
+                       c = buf[0] = " 123456789"[v/1000];
+                       if (c!=' ') fmt = "0123456789";
+                       buf[1] = fmt[v/100%10];
+                       buf[2] = "0123456789"[v/10%10];
+               } else {        // scaled value is <10: use 1.2M format
+                       buf[0] = "0123456789"[v/10];
+                       buf[1] = '.';
+                       buf[2] = "0123456789"[v%10];
+               }
+               // see http://en.wikipedia.org/wiki/Tera
+               buf[3] = " kMGTPEZY"[idx];
+       }
+       buf[4] = '\0';
+}
+
+
 // Convert unsigned integer to ascii, writing into supplied buffer.  A
 // truncated result is always null terminated (unless buflen is 0), and
 // contains the first few digits of the result ala strncpy.
+void BUG_sizeof_unsigned_not_4(void);
 void utoa_to_buf(unsigned n, char *buf, unsigned buflen)
 {
-       int i, out = 0;
+       unsigned i, out, res;
+       if (sizeof(unsigned) != 4)
+               BUG_sizeof_unsigned_not_4();
        if (buflen) {
-               for (i=1000000000; i; i/=10) {
-                       int res = n/i;
-
-                       if ((res || out || i == 1) && --buflen>0) {
+               out = 0;
+               for (i = 1000000000; i; i /= 10) {
+                       res = n / i;
+                       if (res || out || i == 1) {
+                               if (!--buflen) break;
                                out++;
                                n -= res*i;
                                *buf++ = '0' + res;
                        }
                }
-               *buf = 0;
+               *buf = '\0';
        }
 }
 

diff --git a/miscutils/nmeter.c b/miscutils/nmeter.c
index d71bd6a..326d7b8 100644 (file)
--- a/miscutils/nmeter.c
+++ b/miscutils/nmeter.c
@@ -214,42 +214,8 @@ static int rdval_diskstats(const char* p, ullong *vec)
 
 static void scale(ullong ul)
 {
-       char *fmt;
        char buf[5];
-       char c;
-       unsigned v,idx = 0;
-       ul *= 10;
-       if (ul > 9999*10) { // do not scale if 9999 or less
-               while (ul >= 10000) {
-                       ul /= 1024;
-                       idx++;
-               }
-       }
-       v = ul; // ullong divisions are expensive, avoid them
-
-       fmt = " 123456789";
-       if (!idx) {             // 9999 or less: use 1234 format
-               c = buf[0] = " 123456789"[v/10000];
-               if (c!=' ') fmt = "0123456789";
-               c = buf[1] = fmt[v/1000%10];
-               if (c!=' ') fmt = "0123456789";
-               buf[2] = fmt[v/100%10];
-               buf[3] = "0123456789"[v/10%10];
-       } else {
-               if (v>=10*10) { // scaled value is >=10: use 123M format
-                       c = buf[0] = " 123456789"[v/1000];
-                       if (c!=' ') fmt = "0123456789";
-                       buf[1] = fmt[v/100%10];
-                       buf[2] = "0123456789"[v/10%10];
-               } else {        // scaled value is <10: use 1.2M format
-                       buf[0] = "0123456789"[v/10];
-                       buf[1] = '.';
-                       buf[2] = "0123456789"[v%10];
-               }
-               // see http://en.wikipedia.org/wiki/Tera
-               buf[3] = " kMGTPEZY"[idx];
-       }
-       buf[4] = '\0';
+       smart_ulltoa5(ul, buf);
        put(buf);
 }