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add a function to create a copy of a stretchy buffer

pull/505/head
Chris Cunningham 2017-09-19 03:26:30 +00:00
parent 9d9f75eb68
commit 1ec8582e91
1 changed files with 23 additions and 0 deletions
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23
stretchy_buffer.h
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@ -175,6 +175,7 @@
#define sb_count stb_sb_count
#define sb_add stb_sb_add
#define sb_last stb_sb_last
#define sb_copy stb_sb_copy
#endif
#define stb_sb_free(a) ((a) ? free(stb__sbraw(a)),0 : 0)
@ -182,6 +183,7 @@
#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_sb_copy(a) ((a) ? stb__copy((a), sizeof(*(a))) : 0)
#define stb__sbraw(a) ((int *) (a) - 2)
#define stb__sbm(a) stb__sbraw(a)[0]
@ -192,6 +194,27 @@
#define stb__sbgrow(a,n) ((a) = stb__sbgrowf((a), (n), sizeof(*(a))))
#include <stdlib.h>
#include <string.h>
static void * stb__copy(void *arr, int itemsize)
{
if (!arr) {
return NULL;
}
int count = 2 * sizeof(int) + stb_sb_count(arr) * itemsize;
printf("copying %d bytes\n", count);
int *p = malloc(count);
if (p) {
memcpy(p, stb__sbraw(arr), count);
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
}
}
static void * stb__sbgrowf(void *arr, int increment, int itemsize)
{