[Bug 240456] realloc(x, 0) should not return NULL

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240456

            Bug ID: 240456
           Summary: realloc(x, 0) should not return NULL
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: standards
          Assignee: standards at FreeBSD.org
          Reporter: emaste at freebsd.org

In the same way that malloc(0) returns non-NULL, realloc(x, 0) should return a
pointer to an allocation of size 0, not NULL.

test case:

#include <stdio.h>
#include <stdlib.h>

int
main(int argc, char *argv[])
{
        printf("%p\n", realloc(malloc(1), 0));
}

% ./a.out        
0x0

Twitter thread for reference:
https://twitter.com/RichFelker/status/1171108501751554048

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