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libbb: shrink wget/tftp progress indicator code a bit more

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This makes size display 5-char wide instead of 6-char, but now it's smarter
(can show sizes in "12.3M" format).

function                                             old     new   delta
bb_progress_update                                   654     622     -32

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-02-07 23:48:34 +01:00
parent ab843e3244
commit 47529d3f16
1 changed files with 27 additions and 29 deletions
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56
libbb/progress.c
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@ -71,10 +71,9 @@ void FAST_FUNC bb_progress_update(bb_progress_t *p,
uoff_t transferred,
uoff_t totalsize)
{
unsigned beg_and_transferred; /* does not need uoff_t, see scaling code below */
char numbuf5[6]; /* 5 + 1 for NUL */
unsigned since_last_update, elapsed;
int notty;
int kiloscale;
//transferred = 1234; /* use for stall detection testing */
//totalsize = 0; /* use for unknown size download testing */
@ -95,24 +94,22 @@ void FAST_FUNC bb_progress_update(bb_progress_t *p,
return;
}
kiloscale = 0;
/* Before we lose real, unscaled sizes, produce human-readable size string */
smart_ulltoa5(beg_size + transferred, numbuf5, " kMGTPEZY")[0] = '\0';
/*
* Scale sizes down if they are close to overflowing.
* This allows calculations like (100 * transferred / totalsize)
* without risking overflow: we guarantee 10 highest bits to be 0.
* Introduced error is less than 1 / 2^12 ~= 0.025%
*/
while (totalsize >= (1 << 22)) {
totalsize >>= 10;
beg_size >>= 10;
transferred >>= 10;
kiloscale++;
while (totalsize >= (1 << 20)) {
totalsize >>= 8;
beg_size >>= 8;
transferred >>= 8;
}
/* If they were huge, now they are scaled down to [4194303,4096] range.
* (N * totalsize) won't overflow 32 bits for N up to 1024.
* The downside is that files larger than 4194303 kbytes (>4GB)
* never show kbytes download size, they show "0M","1M"... right away
* since kiloscale is already >1.
/* If they were huge, now they are scaled down to [1048575,4096] range.
* (N * totalsize) won't overflow 32 bits for N up to 4096.
*/
#if ULONG_MAX == 0xffffffff
/* 32-bit CPU, uoff_t arithmetic is complex on it, cast variables to narrower types */
@ -124,19 +121,26 @@ void FAST_FUNC bb_progress_update(bb_progress_t *p,
notty = !isatty(STDERR_FILENO);
if (ENABLE_UNICODE_SUPPORT)
fprintf(stderr, "\r%s" + notty, p->curfile);
fprintf(stderr, "\r%s " + notty, p->curfile);
else
fprintf(stderr, "\r%-20.20s" + notty, p->curfile);
beg_and_transferred = beg_size + transferred;
fprintf(stderr, "\r%-20.20s " + notty, p->curfile);
if (totalsize != 0) {
int barlength;
unsigned ratio = 100 * beg_and_transferred / totalsize;
fprintf(stderr, "%4u%%", ratio);
unsigned beg_and_transferred; /* does not need uoff_t, see scaling code */
unsigned ratio;
barlength = get_terminal_width(2) - 49;
if (barlength > 0) {
beg_and_transferred = beg_size + transferred;
ratio = 100 * beg_and_transferred / totalsize;
/* can't overflow ^^^^^^^^^^^^^^^ */
fprintf(stderr, "%3u%% ", ratio);
barlength = get_terminal_width(2) - 48;
/*
* Must reject barlength <= 0 (terminal too narrow). While at it,
* also reject: 1-char bar (useless), 2-char bar (ridiculous).
*/
if (barlength > 2) {
if (barlength > 999)
barlength = 999;
{
@ -147,18 +151,12 @@ void FAST_FUNC bb_progress_update(bb_progress_t *p,
memset(buf, ' ', barlength);
buf[barlength] = '\0';
memset(buf, '*', stars);
fprintf(stderr, " |%s|", buf);
fprintf(stderr, "|%s| ", buf);
}
}
}
while (beg_and_transferred >= 100000) {
beg_and_transferred >>= 10;
kiloscale++;
}
/* see http://en.wikipedia.org/wiki/Tera */
fprintf(stderr, "%6u%c", (unsigned)beg_and_transferred, " kMGTPEZY"[kiloscale]);
#define beg_and_transferred dont_use_beg_and_transferred_below()
fputs(numbuf5, stderr); /* "NNNNk" */
since_last_update = elapsed - p->last_change_sec;
if ((unsigned)transferred != p->last_size) {