POSIX mandates that -F str be treated the same as -v FS=str.

For a null string, this was not the case.  Since awk(1) documents
that a null string for FS has a specific behavior, make -F '' behave
consistently with -v FS="".  https://github.com/onetrueawk/awk/pull/128

diff --git a/usr.bin/awk/main.c b/usr.bin/awk/main.c
index 5a19594..61b011b 100644 (file)
--- a/usr.bin/awk/main.c
+++ b/usr.bin/awk/main.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: main.c,v 1.47 2020/12/18 21:36:24 millert Exp $       */
+/*     $OpenBSD: main.c,v 1.48 2021/07/27 18:28:19 millert Exp $       */
 /****************************************************************
 Copyright (C) Lucent Technologies 1997
 All Rights Reserved
@@ -111,9 +111,7 @@ setfs(char *p)
        /* wart: t=>\t */
        if (p[0] == 't' && p[1] == '\0')
                return "\t";
-       else if (p[0] != '\0')
-               return p;
-       return NULL;
+       return p;
 }
 
 static char *
@@ -189,8 +187,6 @@ int main(int argc, char *argv[])
                        break;
                case 'F':       /* set field separator */
                        fs = setfs(getarg(&argc, &argv, "no field separator"));
-                       if (fs == NULL)
-                               WARNING("field separator FS is empty");
                        break;
                case 'v':       /* -v a=1 to be done NOW.  one -v for each */
                        vn = getarg(&argc, &argv, "no variable name");