bug#72568: [PATCH] printf: Fix description of %b format

[Keith Thompson]

* src/printf.c: Document that \0 can be followed by 0 to 3 octal digits
* doc/coreutils.texi: Change "\0OOO" to "\0NNN" for legibility and
consistency with man page and help message. Remove extraneous '\'.
---
 doc/coreutils.texi | 4 ++--
 src/printf.c       | 6 ++++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index 00e401cbd..51e06527c 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -13438,8 +13438,8 @@ one.
 An additional directive @samp{%b}, prints its
 argument string with @samp{\} escapes interpreted in the same way as in
 the @var{format} string, except that octal escapes are of the form
-@samp{\0@var{ooo}} where @var{ooo} is 0 to 3 octal digits.  If
-@samp{\@var{ooo}} is nine-bit value, ignore the ninth bit.
+@samp{\0@var{NNN}} where @var{NNN} is 0 to 3 octal digits.  If
+@var{NNN} is nine-bit value, ignore the ninth bit.
 If a precision is also given, it limits the number of bytes printed
 from the converted string.

diff --git a/src/printf.c b/src/printf.c
index 7ac7a76ce..114288796 100644
--- a/src/printf.c
+++ b/src/printf.c
@@ -39,7 +39,8 @@
    Additional directive:

    %b = print an argument string, interpreting backslash escapes,
-     except that octal escapes are of the form \0 or \0ooo.
+     except that octal escapes are of the form \0 or \0NNN, where
+     NNN is 0 to 3 octal digits.

    %q = print an argument string in a format that can be
      reused as shell input.  Escaped characters used the
@@ -124,7 +125,8 @@ FORMAT controls the output as in C printf.
Interpreted sequences are:\n\
       fputs (_("\
   %%      a single %\n\
   %b      ARGUMENT as a string with '\\' escapes interpreted,\n\
-          except that octal escapes are of the form \\0 or \\0NNN\n\
+          except that octal escapes are of the form \\0NNN,\n\
+          where NNN is 0 to 3 octal digits.\n\
   %q      ARGUMENT is printed in a format that can be reused as shell input,\n\
           escaping non-printable characters with the POSIX $'' syntax.\
 \n\n\
-- 
2.46.0