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Fix REALLOC_ZERO_BYTES_FREES comment to match C17

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* malloc/malloc.c (REALLOC_ZERO_BYTES_FREES):
Update comment to match current C standard.
This commit is contained in:
Paul Eggert 2021-04-11 14:39:20 -07:00
parent 667d9c8d55
commit dff9e592b8
1 changed files with 7 additions and 4 deletions
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11
malloc/malloc.c
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@ -346,10 +346,13 @@ __malloc_assert (const char *assertion, const char *file, unsigned int line,
#define REVEAL_PTR(ptr) PROTECT_PTR (&ptr, ptr)
/*
REALLOC_ZERO_BYTES_FREES should be set if a call to
realloc with zero bytes should be the same as a call to free.
This is required by the C standard. Otherwise, since this malloc
returns a unique pointer for malloc(0), so does realloc(p, 0).
REALLOC_ZERO_BYTES_FREES controls the behavior of realloc (p, 0)
when p is nonnull. If nonzero, realloc (p, 0) should free p and
return NULL. Otherwise, realloc (p, 0) should do the equivalent
of freeing p and returning what malloc (0) would return.
ISO C17 says the behavior is implementation-defined here; glibc
follows historical practice and defines it to be nonzero.
*/
#ifndef REALLOC_ZERO_BYTES_FREES