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ss: use compact output for undetected screen width

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This change fixes calculation of width in case user pipes the output.

SS output output works correctly when stdout is a terminal. When one
pipes the output, it tries to use 80 or 160 columns. That adds a
line-break if user has terminal width of 100 chars and output is of
the similar width. No width is assumed here.

To reproduce the issue, call
ss | less
and see every other line empty if your screen is between 80 and 160
columns wide.

This second version of the patch fixes screen_width being set to arbitrary
value.

Signed-off-by: Peter Junos <petoju@gmail.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Peter Junos 2019-12-26 14:07:09 +01:00 committed by David Ahern
parent 404f2de114
commit c4f5862994
1 changed files with 15 additions and 4 deletions
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19
misc/ss.c
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@ -1135,10 +1135,10 @@ static void buf_free_all(void)
buffer.chunks = 0;
}
/* Get current screen width, default to 80 columns if TIOCGWINSZ fails */
/* Get current screen width, returns -1 if TIOCGWINSZ fails */
static int render_screen_width(void)
{
int width = 80;
int width = -1;
if (isatty(STDOUT_FILENO)) {
struct winsize w;
@ -1159,9 +1159,15 @@ static int render_screen_width(void)
*/
static void render_calc_width(void)
{
int screen_width = render_screen_width();
int screen_width, first, len = 0, linecols = 0;
struct column *c, *eol = columns - 1;
int first, len = 0, linecols = 0;
bool compact_output = false;
screen_width = render_screen_width();
if (screen_width == -1) {
screen_width = INT_MAX;
compact_output = true;
}
/* First pass: set width for each column to measured content length */
for (first = 1, c = columns; c - columns < COL_MAX; c++) {
@ -1183,6 +1189,11 @@ static void render_calc_width(void)
first = 0;
}
if (compact_output) {
/* Compact output, skip extending columns. */
return;
}
/* Second pass: find out newlines and distribute available spacing */
for (c = columns; c - columns < COL_MAX; c++) {
int pad, spacing, rem, last;