56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
// stretchy_buffer.h - v1.02 - public domain - nothings.org/stb
|
|
// a vector<>-like dynamic array for C
|
|
//
|
|
// LICENSE
|
|
//
|
|
// This software is dual-licensed to the public domain and under the following
|
|
// license: you are granted a perpetual, irrevocable license to copy, modify,
|
|
// publish, and distribute this file as you see fit.
|
|
|
|
#ifndef STB_STRETCHY_BUFFER_H_INCLUDED
|
|
#define STB_STRETCHY_BUFFER_H_INCLUDED
|
|
|
|
#ifndef NO_STRETCHY_BUFFER_SHORT_NAMES
|
|
#define sb_free stb_sb_free
|
|
#define sb_push stb_sb_push
|
|
#define sb_count stb_sb_count
|
|
#define sb_add stb_sb_add
|
|
#define sb_last stb_sb_last
|
|
#endif
|
|
|
|
#define stb_sb_free(a) ((a) ? free(stb__sbraw(a)),0 : 0)
|
|
#define stb_sb_push(a,v) (stb__sbmaybegrow(a,1), (a)[stb__sbn(a)++] = (v))
|
|
#define stb_sb_count(a) ((a) ? stb__sbn(a) : 0)
|
|
#define stb_sb_add(a,n) (stb__sbmaybegrow(a,n), stb__sbn(a)+=(n), &(a)[stb__sbn(a)-(n)])
|
|
#define stb_sb_last(a) ((a)[stb__sbn(a)-1])
|
|
|
|
#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) ((a) = stb__sbgrowf((a), (n), sizeof(*(a))))
|
|
|
|
#include <stdlib.h>
|
|
|
|
static void * stb__sbgrowf(void *arr, int increment, int itemsize)
|
|
{
|
|
int dbl_cur = arr ? 2*stb__sbm(arr) : 0;
|
|
int min_needed = stb_sb_count(arr) + increment;
|
|
int m = dbl_cur > min_needed ? dbl_cur : min_needed;
|
|
int *p = (int *) realloc(arr ? stb__sbraw(arr) : 0, itemsize * m + sizeof(int)*2);
|
|
if (p) {
|
|
if (!arr)
|
|
p[1] = 0;
|
|
p[0] = m;
|
|
return p+2;
|
|
} else {
|
|
#ifdef STRETCHY_BUFFER_OUT_OF_MEMORY
|
|
STRETCHY_BUFFER_OUT_OF_MEMORY ;
|
|
#endif
|
|
return (void *) (2*sizeof(int)); // try to force a NULL pointer exception later
|
|
}
|
|
}
|
|
#endif // STB_STRETCHY_BUFFER_H_INCLUDED
|