Re: [bug-gawk] Inconsistent External Command Spawning

[David Millis]

On Sat, 6/22/13, Eli Zaretskii <address@hidden> wrote:


>> Using Klabaster's binaries, which I think are built from canonical source.
>> 4.1.0: Pipe:Quotes, System:Bat
>> 4.0.1: Pipe:Bat, System:Bat

> This cannot be true, because nothing's changed in Gawk on Windows
> wrt pipes and system between 4.0.1 and 4.1.0.

Bizarre.
Canonical /pc/popen.c source indeed hasn't changed at all from 4.0.1 to 4.1.0. 
When __MINGW32__ is defined, both os_system() and os_popen() both call 
scriptify().

Hex editing Klabaster's 4.1.0 binary reveals the string "scriptify" in it, 
suggesting shared code, but behavior in that series HAS changed between 
versions...

- - -
BEGIN {
  # Batch will remove %1. Quote will print as is (no quote chars at risk of 
being eaten in this test).
  command = "ECHO x%1x";

  print "System";
  system(command);

  print "";

  print "Pipe";
  command | getline tmp;
  print tmp;
  close(command);
}
- - -
G:\>gawk410 -f exec_test.txt
System
xx

Pipe
x%1x

G:\>gawk401 -f exec_test.txt
System
xx

Pipe
xx
- - -
0.o

Sanity Check: Do your builds do this?


David