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From: "josephcsible at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug stdio/29182] New: Make getdelim with a delimiter of EOF read
 the entire file
Date: Wed, 25 May 2022 20:41:34 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29182

            Bug ID: 29182
           Summary: Make getdelim with a delimiter of EOF read the entire
                    file
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: stdio
          Assignee: unassigned at sourceware dot org
          Reporter: josephcsible at gmail dot com
  Target Milestone: ---

POSIX says this about getdelim:

> The delimiter argument is an int, the value of which the application shal=
l ensure is a character representable as an unsigned char of equal value th=
at terminates the read process. If the delimiter argument has any other val=
ue, the behavior is undefined.

This means that calling getdelim with a delimiter of EOF is undefined behav=
ior.
I propose that, as a GNU extension, we define this as meaning that there is=
 no
delimiter, and to unconditionally read until end-of-file. Implementing this=
 in
iogetdelim.c would be as simple as skipping the memchr and just setting t to
NULL if delimiter =3D=3D EOF. The only downside of doing this that I can th=
ink of
is that it'd be incompatible with any platforms where sizeof(int) =3D=3D 1,=
 but I'm
not aware of any that we support or plan to.

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