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initial check-in

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This commit is contained in:
Sean Barrett 2014-05-31 12:12:34 -07:00
parent 2d412f0d6c
commit 5576a5044f
1 changed files with 28 additions and 0 deletions
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stretchy_buffer.h Normal file
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// stretchy buffer // init: NULL // free: sbfree() // push_back: sbpush() // size: sbcount() //
#define stbcg_sbfree(a) ((a) ? free(stb__sbraw(a)),0 : 0)
#define stbcg_sbpush(a,v) (stb__sbmaybegrow(a,1), (a)[stb__sbn(a)++] = (v))
#define stbcg_sbcount(a) ((a) ? stb__sbn(a) : 0)
#define stbcg_sbadd(a,n) (stb__sbmaybegrow(a,n), stb__sbn(a)+=(n), &(a)[stb__sbn(a)-(n)])
#define stbcg_sblast(a) ((a)[stb__sbn(a)-1])
#include <stdlib.h>
#define stb__sbraw(a) ((int *) (a) - 2)
#define stb__sbm(a) stb__sbraw(a)[0]
#define stb__sbn(a) stb__sbraw(a)[1]
#define stb__sbneedgrow(a,n) ((a)==0 || stb__sbn(a)+n >= stb__sbm(a))
#define stb__sbmaybegrow(a,n) (stb__sbneedgrow(a,(n)) ? stb__sbgrow(a,n) : 0)
#define stb__sbgrow(a,n) stb__sbgrowf((void **) &(a), (n), sizeof(*(a)))
static void stb__sbgrowf(void **arr, int increment, int itemsize)
{
int d = *arr ? 2*stb__sbm(*arr) : 0, n2 = stbcg_sbcount(*arr) + increment;
int m = d > n2 ? d : n2;
void *p = realloc(*arr ? stb__sbraw(*arr) : 0, itemsize * m + sizeof(int)*2);
assert(p);
if (p) {
if (!*arr) ((int *) p)[1] = 0;
*arr = (void *) ((int *) p + 2);
stb__sbm(*arr) = m;
}
}