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From: Paul Eggert <eggert@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] Fix REALLOC_ZERO_BYTES_FREES comment to match C17 Date: Sun, 11 Apr 2021 21:39:38 +0000 (GMT) [thread overview] Message-ID: <20210411213938.15C6C385800F@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=dff9e592b8f74e2e7be015cbee1c0fad3ef96d37 commit dff9e592b8f74e2e7be015cbee1c0fad3ef96d37 Author: Paul Eggert <eggert@cs.ucla.edu> Date: Sun Apr 11 14:39:20 2021 -0700 Fix REALLOC_ZERO_BYTES_FREES comment to match C17 * malloc/malloc.c (REALLOC_ZERO_BYTES_FREES): Update comment to match current C standard. Diff: --- malloc/malloc.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/malloc/malloc.c b/malloc/malloc.c index 6640385282..0cd3ba78ca 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -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
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