emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

top: use poll instead of select for waiting on one descriptor

Browse Source 
smart_ulltoa5: make it more cryptic. -50 bytes.

function                                             old     new   delta
passwd_main                                         1095    1103      +8
getNum                                               557     565      +8
buffer_fill_and_print                                 73      76      +3
udhcpc_main                                         2393    2395      +2
mkfs_minix_main                                     3071    3070      -1
dname_enc                                            377     373      -4
expmeta                                              480     472      -8
smart_ulltoa5                                        334     283     -51
top_main                                             911     815     -96
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/5 up/down: 21/-160)          Total: -139 bytes
   text    data     bss     dec     hex filename
 770872    1063   10788  782723   bf183 busybox_old
 770732    1063   10788  782583   bf0f7 busybox_unstripped
This commit is contained in:
Denis Vlasenko
2007-08-28 19:35:34 +00:00
parent 7d8de4d55d
commit b308d81e92
3 changed files with 48 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
libbb/xfuncs.c
View File

@@ -284,35 +284,44 @@ void smart_ulltoa5(unsigned long long ul, char buf[5])
{
const char *fmt;
char c;
unsigned v,idx = 0;
ul *= 10;
if (ul > 9999*10) { // do not scale if 9999 or less
while (ul >= 10000) {
unsigned v, u, idx = 0;
if (ul > 9999) { // do not scale if 9999 or less
ul *= 10;
do {
ul /= 1024;
idx++;
}
} while (ul >= 10000);
}
v = ul; // ullong divisions are expensive, avoid them
fmt = " 123456789";
if (!idx) { // 9999 or less: use 1234 format
c = buf[0] = " 123456789"[v/10000];
u = v / 10;
v = v % 10;
if (!idx) {
// 9999 or less: use "1234" format
// u is value/10, v is last digit
c = buf[0] = " 123456789"[u/100];
if (c != ' ') fmt = "0123456789";
c = buf[1] = fmt[v/1000%10];
c = buf[1] = fmt[u/10%10];
if (c != ' ') fmt = "0123456789";
buf[2] = fmt[v/100%10];
buf[3] = "0123456789"[v/10%10];
buf[2] = fmt[u%10];
buf[3] = "0123456789"[v];
} else {
if (v >= 10*10) { // scaled value is >=10: use 123M format
c = buf[0] = " 123456789"[v/1000];
// u is value, v is 1/10ths (allows for 9.2M format)
if (u >= 10) {
// value is >= 10: use "123M', " 12M" formats
c = buf[0] = " 123456789"[u/100];
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];
v = u % 10;
u = u / 10;
buf[1] = fmt[u%10];
} else {
// value is < 10: use "9.2M" format
buf[0] = "0123456789"[u];
buf[1] = '.';
buf[2] = "0123456789"[v%10];
}
buf[2] = "0123456789"[v];
// see http://en.wikipedia.org/wiki/Tera
buf[3] = " kMGTPEZY"[idx];
}
@@ -470,7 +479,8 @@ char *xasprintf(const char *format, ...)
va_end(p);
#endif
if (r < 0) bb_error_msg_and_die(bb_msg_memory_exhausted);
if (r < 0)
bb_error_msg_and_die(bb_msg_memory_exhausted);
return string_ptr;
}