src/bufio/buffer.c


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#include "impl.h"

// NewBuffer allocates a bytes buffer with size 'size'.
// This is unallocated usage.
// Returns the fat pointer by value.

void*
newbuffer(uintptr off, uintptr size)
{
    if (size == 0 || size > BUF·max) size = BUF·size;

    void   *mem = malloc(off + sizeof(Buffer) + size);
    Buffer *buf = mem + off;

    buf->eof  = 0;
    buf->off  = 0;
    buf->base = buf->b + BUF·ungets;
    buf->end  = buf->b + size;
    buf->size = buf->end - buf->base;

    memset(buf->b, 0, size);

    return mem;
}