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#include "cmd.h"
#include "log.h"
#include "net.h"
#include <stdlib.h>
#include <string.h>
static size_t calc_buf_len(int argc, char **argv)
{
size_t len = 0;
for (int i = 0; i < argc; ++i)
len += strlen(argv[i]) + 1;
return len;
}
static int calc_arr_len(const void *buf, size_t len)
{
int argc = 0;
for (const char *it = buf; it < (const char *)buf + len; it += strlen(it) + 1)
++argc;
return argc;
}
static void arr_pack(char *dest, int argc, char **argv)
{
for (int i = 0; i < argc; ++i) {
strcpy(dest, argv[i]);
dest += strlen(argv[i]) + 1;
}
}
static int arr_unpack(char **argv, int argc, const char *src)
{
for (int i = 0; i < argc; ++i)
argv[i] = NULL;
for (int i = 0; i < argc; ++i) {
size_t len = strlen(src);
argv[i] = malloc(len);
if (!argv[i]) {
print_errno("malloc");
goto free;
}
strcpy(argv[i], src);
src += len + 1;
}
return 0;
free:
for (int i = 0; i < argc; ++i)
if (argv[i])
free(argv[i]);
else
break;
return -1;
}
int cmd_send(int fd, const struct cmd *cmd)
{
int ret = 0;
size_t len = calc_buf_len(cmd->argc, cmd->argv);
char *buf = malloc(len);
if (!buf) {
print_errno("malloc");
return -1;
}
arr_pack(buf, cmd->argc, cmd->argv);
ret = send_buf(fd, buf, len);
if (ret < 0)
goto free_buf;
free_buf:
free(buf);
return ret;
}
int cmd_send_and_wait_for_result(int fd, const struct cmd *cmd, int *result)
{
int ret = 0;
ret = cmd_send(fd, cmd);
if (ret < 0)
return ret;
ret = recv_static(fd, result, sizeof(*result));
if (ret < 0)
return ret;
return ret;
}
int cmd_recv(int fd, struct cmd *cmd)
{
void *buf;
size_t len;
int ret = 0;
ret = recv_buf(fd, &buf, &len);
if (ret < 0)
return ret;
cmd->argc = calc_arr_len(buf, len);
cmd->argv = malloc(cmd->argc * sizeof(char *));
if (!cmd->argv) {
print_errno("malloc");
ret = -1;
goto free_buf;
}
memset(cmd->argv, 0, cmd->argc * sizeof(char *));
ret = arr_unpack(cmd->argv, cmd->argc, buf);
if (ret < 0)
goto free_argv;
goto free_buf;
free_argv:
free(cmd->argv);
free_buf:
free(buf);
return ret;
}
int cmd_recv_and_send_result(int fd, cmd_handler handler, void *arg)
{
struct cmd cmd;
int result;
int ret = 0;
ret = cmd_recv(fd, &cmd);
if (ret < 0)
return ret;
result = handler(&cmd, arg);
ret = send_buf(fd, &result, sizeof(result));
if (ret < 0)
goto free_cmd;
free_cmd:
cmd_free(&cmd);
return ret;
}
void cmd_free(const struct cmd *cmd)
{
for (int i = 0; i < cmd->argc; ++i)
free(cmd->argv[i]);
free(cmd->argv);
}
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