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stb_ds: Fix addn when n=0 

In this case, the array pointer may still be 0 even after the
maybegrow.

Fixes issue #1015.
This commit is contained in:
Fabian Giesen 2021-07-07 14:59:13 -07:00
parent b14a80784c
commit 2af2e69219
1 changed files with 2 additions and 2 deletions
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4
stb_ds.h
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@ -544,8 +544,8 @@ extern void * stbds_shmode_func(size_t elemsize, int mode);
#define stbds_arrpush stbds_arrput // synonym
#define stbds_arrpop(a) (stbds_header(a)->length--, (a)[stbds_header(a)->length])
#define stbds_arraddn(a,n) ((void)(stbds_arraddnindex(a, n))) // deprecated, use one of the following instead:
#define stbds_arraddnptr(a,n) (stbds_arrmaybegrow(a,n), stbds_header(a)->length += (n), &(a)[stbds_header(a)->length-(n)])
#define stbds_arraddnindex(a,n)(stbds_arrmaybegrow(a,n), stbds_header(a)->length += (n), stbds_header(a)->length-(n))
#define stbds_arraddnptr(a,n) (stbds_arrmaybegrow(a,n), (n) ? (stbds_header(a)->length += (n), &(a)[stbds_header(a)->length-(n)]) : (a))
#define stbds_arraddnindex(a,n)(stbds_arrmaybegrow(a,n), (n) ? (stbds_header(a)->length += (n), stbds_header(a)->length-(n)) : stbds_arrlen(a))
#define stbds_arraddnoff stbds_arraddnindex
#define stbds_arrlast(a) ((a)[stbds_header(a)->length-1])
#define stbds_arrfree(a) ((void) ((a) ? STBDS_FREE(NULL,stbds_header(a)) : (void)0), (a)=NULL)