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fix: build failure when _SC_PHYS_PAGES is not defined

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_SC_PHYS_PAGES isn't POSIX and might not be defined. in such case, just
return back `CACHE_SIZE_FALLBACK`.

NOTE: POSIX says the `names` in `sysconf()` are "symbolic constants" not
necessarily macros. So we might end up returning the fallback in some
cases where `_SC_PHYS_PAGES` *was* available, but not defined as a
macro. which is not ideal, but nothing fatal.

in practice, this shouldn't be an issue since most systems seems to
define them to be macros, i've checked Glibc, Musl, OpenBSD, FreeBSD and
Haiku.

also add a (useful) comment on `config.h` describing the effect higher
cache size has.

Closes: https://codeberg.org/nsxiv/nsxiv/issues/354
This commit is contained in:
NRK
2022-08-07 19:53:26 +06:00
committed by Gitea
parent fb9686c650
commit becf1cc858
2 changed files with 6 additions and 3 deletions
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6
image.c
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@ -49,14 +49,14 @@ enum { DEF_WEBP_DELAY = 75 };
static int calc_cache_size(void)
{
int cache;
long pages, page_size;
long cache, pages = -1, page_size = -1;
if (CACHE_SIZE_MEM_PERCENTAGE <= 0)
return 0;
#ifdef _SC_PHYS_PAGES /* _SC_PHYS_PAGES isn't POSIX */
pages = sysconf(_SC_PHYS_PAGES);
page_size = sysconf(_SC_PAGE_SIZE);
#endif
if (pages < 0 || page_size < 0)
return CACHE_SIZE_FALLBACK;
cache = (pages/100) * CACHE_SIZE_MEM_PERCENTAGE;