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

libbb/human_readable.c: shrink; and reduce bss usage

Browse Source 
also, move smart_ulltoaN there and comment usage locations

function                                             old     new   delta
static.unit_chars                                      7       9      +2
utoa_to_buf                                          110     108      -2
make_human_readable_str                              262     258      -4
fallbackSort                                        1723    1719      -4
static.fmt                                            97      92      -5
static.fmt_tenths                                     10       -     -10
static.str                                            21       4     -17
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/5 up/down: 2/-42)             Total: -40 bytes
   text    data     bss     dec     hex filename
 820981     453    6932  828366   ca3ce busybox_old
 820968     453    6916  828337   ca3b1 busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2009-10-13 01:25:09 +02:00
parent 76ace254e1
commit 0bf44d00a4
6 changed files with 158 additions and 146 deletions
Download Patch File Download Diff File Expand all files Collapse all files

104
libbb/xfuncs.c
View File

@@ -48,110 +48,6 @@ char* FAST_FUNC strncpy_IFNAMSIZ(char *dst, const char *src)
return strncpy(dst, src, IFNAMSIZ);
}
/* 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[5], const char *scale)
{
const char *fmt;
char c;
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";
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[u/10%10];
if (c != ' ') fmt = "0123456789";
buf[2] = fmt[u%10];
buf[3] = "0123456789"[v];
} else {
// 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";
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];
buf[3] = scale[idx]; /* typically scale = " kmgt..." */
}
}
/* 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[6], const char *scale)
{
const char *fmt;
char c;
unsigned v, u, idx = 0;
if (ul > 99999) { // do not scale if 99999 or less
ul *= 10;
do {
ul /= 1024;
idx++;
} while (ul >= 100000);
}
v = ul; // ullong divisions are expensive, avoid them
fmt = " 123456789";
u = v / 10;
v = v % 10;
if (!idx) {
// 99999 or less: use "12345" format
// u is value/10, v is last digit
c = buf[0] = " 123456789"[u/1000];
if (c != ' ') fmt = "0123456789";
c = buf[1] = fmt[u/100%10];
if (c != ' ') fmt = "0123456789";
c = buf[2] = fmt[u/10%10];
if (c != ' ') fmt = "0123456789";
buf[3] = fmt[u%10];
buf[4] = "0123456789"[v];
} else {
// value has been scaled into 0..9999.9 range
// u is value, v is 1/10ths (allows for 92.1M format)
if (u >= 100) {
// value is >= 100: use "1234M', " 123M" formats
c = buf[0] = " 123456789"[u/1000];
if (c != ' ') fmt = "0123456789";
c = buf[1] = fmt[u/100%10];
if (c != ' ') fmt = "0123456789";
v = u % 10;
u = u / 10;
buf[2] = fmt[u%10];
} else {
// value is < 100: use "92.1M" format
c = buf[0] = " 123456789"[u/10];
if (c != ' ') fmt = "0123456789";
buf[1] = fmt[u%10];
buf[2] = '.';
}
buf[3] = "0123456789"[v];
buf[4] = scale[idx]; /* typically scale = " kmgt..." */
}
}
// Convert unsigned integer to ascii, writing into supplied buffer.
// A truncated result contains the first few digits of the result ala strncpy.