src/base/bufio/unget.c


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#include "internal.h"

int
bufio·ungetbyte(io·Buffer *buf, byte c)
{
    if(!(buf->state & bufio·rdr)) {
        errorf("attempted to unget on non-active reader");
        return bufio·err;
    }

    if(buf->pos == buf->buf) {
        errorf("attempted to unget past end of buffer");
        return bufio·err;
    }

    buf->pos--;
    return 0;
}