[git commit] ed: fix current line number for file passed via the command-line

[Denys Vlasenko]

commit: https://git.busybox.net/busybox/commit/?id=f26eb796e228cbec754e9e24545f5b0a8a50aac1
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

POSIX.1-2008 mandates the following regarding the file command-line
argument:

	If the file argument is given, ed shall simulate an e command
	on the file named by the pathname […]

The specification for the e command mandates the following behaviour
regarding the current line number in POSIX.1-2008:

	The current line number shall be set to the address of the last
	line of the buffer.

However, without this commit, busybox ed will set the current line
number to 1 if a file is given on the command-line and this file is not
empty (lastNum != 0). This is incorrect and fixed in this commit by not
modifying the current line number in ed_main(). As such, the current
line number will be zero for empty files and otherwise be set to the
address of the last line of the buffer.

function                                             old     new   delta
ed_main                                              144     128     -16

Signed-off-by: Sören Tempel <soeren+git at soeren-tempel.net>
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 editors/ed.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/editors/ed.c b/editors/ed.c
index 18faba5a4..fed10c470 100644
--- a/editors/ed.c
+++ b/editors/ed.c
@@ -1016,8 +1016,6 @@ int ed_main(int argc UNUSED_PARAM, char **argv)
 		if (!readLines(fileName, 1)) {
 			return EXIT_SUCCESS;
 		}
-		if (lastNum)
-			setCurNum(1);
 		dirty = FALSE;
 	}