printf/printf/printFdBuffer.c

#include <unistd.h>
#include <sys/param.h>
#include <string.h>
#include "ft_printf_internal.h"

int appendToFdBuffer(struct printf_data* data, const char* buf, size_t len)
{
    size_t sizeToWrite = MIN(data->bufferMaxSize - data->bufferPos, len);
    memcpy(&data->fdBuffer[data->bufferPos], buf, sizeToWrite);
    data->bufferPos += sizeToWrite;
    if (data->bufferPos == data->bufferMaxSize)
    {
        int result = write(data->fd, data->fdBuffer, data->bufferMaxSize);
        if (result < 0)
            return result;
        data->bufferPos = 0;
    }
    return sizeToWrite;
}