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authorDenys Vlasenko2018-02-07 23:48:34 +0100
committerDenys Vlasenko2018-02-07 23:48:34 +0100
commit47529d3f165c06bd0c3be751fdd4b743b4bddedb (patch)
tree9ff056176bd404213e9e8d95fab09f5def0c23fd
parentab843e3244e98f92e16b9c9c1f06dbab87e97175 (diff)
downloadbusybox-47529d3f165c06bd0c3be751fdd4b743b4bddedb.zip
busybox-47529d3f165c06bd0c3be751fdd4b743b4bddedb.tar.gz
libbb: shrink wget/tftp progress indicator code a bit more
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>
-rw-r--r--libbb/progress.c56
1 files changed, 27 insertions, 29 deletions
diff --git a/libbb/progress.c b/libbb/progress.c
index 17272fd..f1d980d 100644
--- a/libbb/progress.c
+++ b/libbb/progress.c
@@ -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;
+
+ beg_and_transferred = beg_size + transferred;
+ ratio = 100 * beg_and_transferred / totalsize;
+ /* can't overflow ^^^^^^^^^^^^^^^ */
+ fprintf(stderr, "%3u%% ", ratio);
- barlength = get_terminal_width(2) - 49;
- if (barlength > 0) {
+ 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) {