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https://github.com/Unidata/netcdf-c.git
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74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
/* Copyright 2018, UCAR/Unidata and OPeNDAP, Inc.
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See the COPYRIGHT file for more information. */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "config.h"
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#include "d4util.h"
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#include "d4bytes.h"
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#define DEFAULTMINALLOC 8
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D4bytes*
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d4bytesnew(void)
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{
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D4bytes* d4m = (D4bytes*)malloc(sizeof(D4bytes));
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if(d4m == NULL) return NULL;
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d4m->alloc=0;
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d4m->used=0;
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d4m->memory=NULL;
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return d4m;
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}
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void
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d4bytesfree(D4bytes* d4m)
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{
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if(d4m == NULL) return;
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if(d4m->memory != NULL) free(d4m->memory);
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free(d4m);
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}
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void*
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d4bytesalloc(D4bytes* d4m, size_t sz)
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{
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void* allocation;
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size_t newalloc;
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if(sz == 0 || d4m == NULL) return NULL;
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newalloc = d4m->alloc;
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if(newalloc == 0) newalloc = DEFAULTMINALLOC;
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for(;;) {
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size_t avail = newalloc - d4m->used;
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if(avail >= sz) { /* rebuild */
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void* newmem = realloc(d4m->memory,newalloc);
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d4m->memory = newmem;
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d4m->alloc = newalloc;
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break;
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}
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newalloc = (2*newalloc); /* keep doubling */
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}
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allocation = (void*)(((char*)d4m->memory)+d4m->used);
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d4m->used += sz;
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return allocation;
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}
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void*
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d4byteszero(D4bytes* d4m, size_t sz)
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{
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void* mem = d4bytesalloc(d4m,sz);
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memset(mem,0,sz);
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return mem;
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}
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D4bytes*
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d4bytesconcat(D4bytes* dst, D4bytes* src)
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{
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if(dst == NULL && src != NULL && src->used > 0) {
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void* target = d4bytesalloc(dst,src->used);
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d4memmove(target,src->memory,src->used);
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}
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return dst;
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}
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