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#include <stdio.h>
#include <string.h>
#include "erl_driver.h"
/* -------------------------------------------------------------------------
** Data types
**/
typedef struct _erl_drv_data EchoDrvData;
/* -------------------------------------------------------------------------
** Entry struct
**/
static EchoDrvData *echo_drv_start(ErlDrvPort port, char *command);
static void echo_drv_stop(EchoDrvData *data_p);
static void echo_drv_output(ErlDrvData drv_data, char *buf, ErlDrvSizeT len);
static ErlDrvSSizeT echo_control(ErlDrvData drv_data,
unsigned int command, char *buf,
ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen);
static void echo_outputv(ErlDrvData drv_data, ErlIOVec *ev);
static void echo_drv_finish(void);
static ErlDrvEntry echo_drv_entry = {
NULL, /* init */
echo_drv_start,
echo_drv_stop,
echo_drv_output,
NULL, /* ready_input */
NULL, /* ready_output */
"echo_drv",
echo_drv_finish,
NULL, /* handle */
echo_control, /* control */
NULL, /* timeout */
echo_outputv, /* outputv */
NULL, /* ready_async */
NULL,
NULL,
NULL,
ERL_DRV_EXTENDED_MARKER,
ERL_DRV_EXTENDED_MAJOR_VERSION,
ERL_DRV_EXTENDED_MINOR_VERSION,
0,
NULL,
NULL,
NULL,
};
/* -------------------------------------------------------------------------
** Entry functions
**/
DRIVER_INIT(echo_drv)
{
char buf[10];
size_t bufsz = sizeof(buf);
char *use_outputv;
use_outputv = (erl_drv_getenv("ECHO_DRV_USE_OUTPUTV", buf, &bufsz) == 0
? buf
: "false");
if (strcmp(use_outputv, "true") != 0)
echo_drv_entry.outputv = NULL;
return &echo_drv_entry;
}
static EchoDrvData *echo_drv_start(ErlDrvPort port, char *command) {
void *void_ptr;
int res = -4711;
if (command) {
while(*command != '\0' && *command != ' ')
++command;
while(*command != '\0' && *command == ' ')
++command;
if(*command == '-') {
res = driver_output(port, command+1, strlen(command) - 1);
}
}
return void_ptr = port;
}
static void echo_drv_stop(EchoDrvData *data_p) {
}
static void echo_drv_output(ErlDrvData drv_data, char *buf, ErlDrvSizeT len) {
EchoDrvData *data_p = (EchoDrvData *) drv_data;
void *void_ptr;
ErlDrvPort port = void_ptr = data_p;
driver_output(port, buf, len);
}
static void echo_drv_finish() {
}
static ErlDrvSSizeT echo_control(ErlDrvData drv_data,
unsigned int command, char *buf,
ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen)
{
return 0;
}
static void echo_outputv(ErlDrvData drv_data, ErlIOVec *ev)
{
return;
}
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