ls: Remove trailing whitespace so that tests pass

When in modes `-C` and `-x` we need to remove the trailing whitespace
on each line. This is the behavior of other `ls` commands.

Other `ls` commands will print the last filename and then print a
newline. Prior to this patch we would print the last filename, followed
by two spaces, and then print a newline.
Previously, we would get to the end of the loop and print the padding.
I couldn't figure out a way to determine when the program had reached
the end of a line. So I piggybacked off of the newline code.

1 files changed, 6 insertions, 7 deletions

diff --git a/toys/posix/ls.c b/toys/posix/ls.c
index 809e2504..c7b09bf2 100644
--- a/toys/posix/ls.c
+++ b/toys/posix/ls.c
@@ -403,9 +403,10 @@ static void listfiles(int dirfd, struct dirtree *indir)
 
   // Loop through again to produce output.
   width = 0;
+  unsigned curcol = 0;
   for (ul = 0; ul<dtlen; ul++) {
     int ii, zap;
-    unsigned curcol, color = 0;
+    unsigned lastlen = *len, lastcol = curcol, color = 0;
     unsigned long next = next_column(ul, dtlen, columns, &curcol);
     struct stat *st = &(sort[next]->st);
     mode_t mode = st->st_mode;
@@ -426,6 +427,10 @@ static void listfiles(int dirfd, struct dirtree *indir)
       if (mm) xputc(',');
       if (flags & (FLAG_C|FLAG_x)) {
         if (!curcol) xputc('\n');
+        else { // Pad columns
+          lastcol = colsizes[lastcol]-lastlen-totpad;
+          printf("%*c", lastcol, ' ');
+        }
       } else if ((flags & FLAG_1) || width+1+*len > TT.screen_width) {
         xputc('\n');
         width = 0;
@@ -521,12 +526,6 @@ static void listfiles(int dirfd, struct dirtree *indir)
     }
 
     if (et) xputc(et);
-
-    // Pad columns
-    if (flags & (FLAG_C|FLAG_x)) {
-      curcol = colsizes[curcol]-(*len)-totpad;
-      if (curcol < 255) printf("%*c", curcol, ' ');
-    }
   }
 
   if (width) xputc('\n');