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/*
* Copyright (c) 2014 Kungliga Tekniska Högskolan
* (KTH Royal Institute of Technology, Stockholm, Sweden).
*/
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "net_read_write.h"
#include "erlport.h"
static ssize_t
read_length(size_t length_size)
{
unsigned char buf[2];
if (length_size != 2) {
return -1;
}
if (length_size > sizeof(buf)) {
return -1;
}
ssize_t ret;
ret = net_read(0, (char *)buf, length_size);
if (ret != (ssize_t) length_size) {
return -1;
}
return (ssize_t)(((unsigned long)buf[0] << 8) | (unsigned long)buf[1]);
}
ssize_t
read_command(char *buf, size_t maxlen)
{
ssize_t len;
len = read_length(2);
if (len < 0) {
return -1;
}
if (len > (ssize_t) maxlen) {
return -1;
}
return net_read(0, buf, (size_t)len);
}
static int
write_length(size_t len, size_t length_size)
{
unsigned char buf[2];
if (length_size != 2) {
return -1;
}
buf[0] = (len >> 8) & 0xff;
buf[1] = len & 0xff;
ssize_t ret;
ret = net_write(1, (char *)buf, length_size);
if (ret < 0) {
return -1;
}
if (ret != (ssize_t) length_size) {
return -1;
}
return 0;
}
static int
write_reply(char *msg, size_t len)
{
ssize_t ret;
ret = write_length(len, 2);
if (ret < 0) {
return -1;
}
ret = net_write(1, msg, len);
if (ret < 0) {
return -1;
}
return 0;
}
int
write_status(char *msg)
{
return write_reply(msg, strlen(msg));
}
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