earlybrowserreborn - Rev 1

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/*              Chunk handling: Flexible arrays
**              ===============================
**
*/


#include "HTUtils.h"
#include "HTChunk.h"
#include <stdio.h>

/*      Create a chunk with a certain allocation unit
**      --------------
*/

PUBLIC HTChunk * HTChunkCreate ARGS1 (int,grow)
{
    HTChunk * ch = (HTChunk *) malloc(sizeof(HTChunk));
    if (ch == NULL) outofmem(__FILE__, "cretion of chunk");

    ch->data = 0;
    ch->growby = grow;
    ch->size = 0;
    ch->allocated = 0;
    return ch;
}


/*      Clear a chunk of all data
**      --------------------------
*/

PUBLIC void HTChunkClear ARGS1 (HTChunk *,ch)
{
    if (ch->data) {
        free(ch->data);
        ch->data = 0;
    }
    ch->size = 0;
    ch->allocated = 0;
}


/*      Free a chunk
**      ------------
*/

PUBLIC void HTChunkFree ARGS1 (HTChunk *,ch)
{
    if (ch->data) free(ch->data);
    free(ch);
}


/*      Append a character
**      ------------------
*/

PUBLIC void HTChunkPutc ARGS2 (HTChunk *,ch, char,c)
{
    if (ch->size >= ch->allocated) {
        ch->allocated = ch->allocated + ch->growby;
        ch->data = ch->data ? (char *)realloc(ch->data, ch->allocated)
                            : (char *)malloc(ch->allocated);
      if (!ch->data) outofmem(__FILE__, "HTChunkPutc");
    }
    ch->data[ch->size++] = c;
}


/*      Ensure a certain size
**      ---------------------
*/

PUBLIC void HTChunkEnsure ARGS2 (HTChunk *,ch, int,needed)
{
    if (needed <= ch->allocated) return;
    ch->allocated = needed-1 - ((needed-1) % ch->growby)
                             + ch->growby; /* Round up */
    ch->data = ch->data ? (char *)realloc(ch->data, ch->allocated)
                        : (char *)malloc(ch->allocated);
    if (ch->data == NULL) outofmem(__FILE__, "HTChunkEnsure");
}


/*      Terminate a chunk
**      -----------------
*/

PUBLIC void HTChunkTerminate ARGS1 (HTChunk *,ch)
{
    HTChunkPutc(ch, (char)0);
}


/*      Append a string
**      ---------------
*/

PUBLIC void HTChunkPuts ARGS2 (HTChunk *,ch, CONST char *,s)
{
    CONST char * p;
    for (p=s; *p; p++)
        HTChunkPutc(ch, *p);
}