ed: Allow z commands with no address - sbase - suckless unix tools
  HTML git clone git://git.suckless.org/sbase
   DIR Log
   DIR Files
   DIR Refs
   DIR README
   DIR LICENSE
       ---
   DIR commit ae50e31d532df74e97d2e0525d0f282cf3377142
   DIR parent 0190f5e7bf8985af3ed768f7d17d192c23beb5d1
  HTML Author: Roberto E. Vargas Caballero <k0ga@shike2.net>
       Date:   Mon,  8 Dec 2025 17:01:30 +0100
       
       ed: Allow z commands with no address
       
       When a single z commit is executed then nlines == 0, and
       we don't have a value for the line where scroll and this
       is why we have to call deflines() to setup the default
       value.
       
       Diffstat:
         M ed.c                                |       3 ++-
         A tests/0006-ed.sh                    |      14 ++++++++++++++
       
       2 files changed, 16 insertions(+), 1 deletion(-)
       ---
   DIR diff --git a/ed.c b/ed.c
       @@ -1385,13 +1385,14 @@ repeat:
                                      join();
                        break;
                case 'z':
       -                if (nlines != 1)
       +                if (nlines > 1)
                                goto bad_address;
                        if (isdigit(back(input())))
                                num = getnum();
                        else
                                num = 24;
                        chkprint(1);
       +                deflines(curln, curln);
                        scroll(num);
                        break;
                case 'k':
   DIR diff --git a/tests/0006-ed.sh b/tests/0006-ed.sh
       @@ -0,0 +1,14 @@
       +#!/bin/sh
       +
       +../ed <<EOF | (read a && read b && test $a-$b == 1-2)
       +0a
       +1
       +2
       +3
       +4
       +5
       +6
       +.
       +1z1
       +z1
       +EOF