src/cbuf/read.c

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#include <sys/types.h>
#include <unistd.h>
#include <errno.h>

#include "cbuf.h"
#include "stream.h"


ssize_t
cbufRead(Cbuf this, Stream st)
{
        ssize_t rrsize = 0;
        size_t  rsize  = cbufGetFree(this);

        if (0 == rsize) {
                errno = ECBUFOVFL;
                return -1;
        }

        rrsize = streamRead(st, cbufGetWrite(this), rsize);

        switch (rrsize) {
                case  0:
                        rrsize = -2;
                        // DROP THROUGH

                case -1:
                        break;

                default:
                        cbufIncWrite(this, rrsize);
                        break;
        }

        return rrsize;
}

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