Nguyễn Thái Ngọc Duy <pclo...@gmail.com> writes:
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
> ---
I think the basic idea is sound.
"git grep -e _gentle -e _gently -e _gentler" hints me that the new
functions are somewhat misnamed, though.
> git-compat-util.h | 2 ++
> wrapper.c | 73
> +++++++++++++++++++++++++++++++++++++++++++------------
> 2 files changed, 59 insertions(+), 16 deletions(-)
>
> diff --git a/git-compat-util.h b/git-compat-util.h
> index f587749..0e541e7 100644
> --- a/git-compat-util.h
> +++ b/git-compat-util.h
> @@ -592,7 +592,9 @@ extern try_to_free_t
> set_try_to_free_routine(try_to_free_t);
> #endif
> extern char *xstrdup(const char *str);
> extern void *xmalloc(size_t size);
> +extern void *xmalloc_gentle(size_t size);
> extern void *xmallocz(size_t size);
> +extern void *xmallocz_gentle(size_t size);
> extern void *xmemdupz(const void *data, size_t len);
> extern char *xstrndup(const char *str, size_t len);
> extern void *xrealloc(void *ptr, size_t size);
> diff --git a/wrapper.c b/wrapper.c
> index bc1bfb8..ad0992a 100644
> --- a/wrapper.c
> +++ b/wrapper.c
> @@ -9,16 +9,23 @@ static void do_nothing(size_t size)
>
> static void (*try_to_free_routine)(size_t size) = do_nothing;
>
> -static void memory_limit_check(size_t size)
> +static int memory_limit_check(size_t size, int gentle)
> {
> static int limit = -1;
> if (limit == -1) {
> const char *env = getenv("GIT_ALLOC_LIMIT");
> limit = env ? atoi(env) * 1024 : 0;
> }
> - if (limit && size > limit)
> - die("attempting to allocate %"PRIuMAX" over limit %d",
> - (intmax_t)size, limit);
> + if (limit && size > limit) {
> + if (gentle) {
> + error("attempting to allocate %"PRIuMAX" over limit %d",
> + (intmax_t)size, limit);
> + return -1;
> + } else
> + die("attempting to allocate %"PRIuMAX" over limit %d",
> + (intmax_t)size, limit);
> + }
> + return 0;
> }
>
> try_to_free_t set_try_to_free_routine(try_to_free_t routine)
> @@ -42,11 +49,12 @@ char *xstrdup(const char *str)
> return ret;
> }
>
> -void *xmalloc(size_t size)
> +static void *do_xmalloc(size_t size, int gentle)
> {
> void *ret;
>
> - memory_limit_check(size);
> + if (memory_limit_check(size, gentle))
> + return NULL;
> ret = malloc(size);
> if (!ret && !size)
> ret = malloc(1);
> @@ -55,9 +63,16 @@ void *xmalloc(size_t size)
> ret = malloc(size);
> if (!ret && !size)
> ret = malloc(1);
> - if (!ret)
> - die("Out of memory, malloc failed (tried to allocate
> %lu bytes)",
> - (unsigned long)size);
> + if (!ret) {
> + if (!gentle)
> + die("Out of memory, malloc failed (tried to
> allocate %lu bytes)",
> + (unsigned long)size);
> + else {
> + error("Out of memory, malloc failed (tried to
> allocate %lu bytes)",
> + (unsigned long)size);
> + return NULL;
> + }
> + }
> }
> #ifdef XMALLOC_POISON
> memset(ret, 0xA5, size);
> @@ -65,16 +80,42 @@ void *xmalloc(size_t size)
> return ret;
> }
>
> -void *xmallocz(size_t size)
> +void *xmalloc(size_t size)
> +{
> + return do_xmalloc(size, 0);
> +}
> +
> +void *xmalloc_gentle(size_t size)
> +{
> + return do_xmalloc(size, 1);
> +}
> +
> +static void *do_xmallocz(size_t size, int gentle)
> {
> void *ret;
> - if (unsigned_add_overflows(size, 1))
> - die("Data too large to fit into virtual memory space.");
> - ret = xmalloc(size + 1);
> - ((char*)ret)[size] = 0;
> + if (unsigned_add_overflows(size, 1)) {
> + if (gentle) {
> + error("Data too large to fit into virtual memory
> space.");
> + return NULL;
> + } else
> + die("Data too large to fit into virtual memory space.");
> + }
> + ret = do_xmalloc(size + 1, gentle);
> + if (ret)
> + ((char*)ret)[size] = 0;
> return ret;
> }
>
> +void *xmallocz(size_t size)
> +{
> + return do_xmallocz(size, 0);
> +}
> +
> +void *xmallocz_gentle(size_t size)
> +{
> + return do_xmallocz(size, 1);
> +}
> +
> /*
> * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
> * "data" to the allocated memory, zero terminates the allocated memory,
> @@ -96,7 +137,7 @@ void *xrealloc(void *ptr, size_t size)
> {
> void *ret;
>
> - memory_limit_check(size);
> + memory_limit_check(size, 0);
> ret = realloc(ptr, size);
> if (!ret && !size)
> ret = realloc(ptr, 1);
> @@ -115,7 +156,7 @@ void *xcalloc(size_t nmemb, size_t size)
> {
> void *ret;
>
> - memory_limit_check(size * nmemb);
> + memory_limit_check(size * nmemb, 0);
> ret = calloc(nmemb, size);
> if (!ret && (!nmemb || !size))
> ret = calloc(1, 1);
--
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