1 // stretchy buffer // init: NULL // free: sbfree() // push_back: sbpush() // size: sbcount() //
2 #define sbfree(a) ((a) ? free(stb__sbraw(a)),0 : 0)
3 #define sbpush(a,v) (stb__sbmaybegrow(a,1), (a)[stb__sbn(a)++] = (v))
4 #define sbcount(a) ((a) ? stb__sbn(a) : 0)
5 #define sbadd(a,n) (stb__sbmaybegrow(a,n), stb__sbn(a)+=(n), &(a)[stb__sbn(a)-(n)])
6 #define sblast(a) ((a)[stb__sbn(a)-1])
9 #define stb__sbraw(a) ((int *) (a) - 2)
10 #define stb__sbm(a) stb__sbraw(a)[0]
11 #define stb__sbn(a) stb__sbraw(a)[1]
13 #define stb__sbneedgrow(a,n) ((a)==0 || stb__sbn(a)+n >= stb__sbm(a))
14 #define stb__sbmaybegrow(a,n) (stb__sbneedgrow(a,(n)) ? stb__sbgrow(a,n) : 0)
15 #define stb__sbgrow(a,n) stb__sbgrowf((void **) &(a), (n), sizeof(*(a)))
17 static void stb__sbgrowf(void **arr, int increment, int itemsize)
19 int m = *arr ? 2*stb__sbm(*arr)+increment : increment+1;
20 void *p = realloc(*arr ? stb__sbraw(*arr) : 0, itemsize * m + sizeof(int)*2);
23 if (!*arr) ((int *) p)[1] = 0;
24 *arr = (void *) ((int *) p + 2);