[Bug stdio/29182] New: Make getdelim with a delimiter of EOF read the entire file

[Bug stdio/29182] New: Make getdelim with a delimiter of EOF read the entire file

[josephcsible at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29182

            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 shall ensure is a character representable as an unsigned char of equal value that terminates the read process. If the delimiter argument has any other value, the behavior is undefined.

This means that calling getdelim with a delimiter of EOF is undefined behavior.
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 == EOF. The only downside of doing this that I can think of
is that it'd be incompatible with any platforms where sizeof(int) == 1, but I'm
not aware of any that we support or plan to.

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