receive sms termios

#include <stdio.h>   /* Standard input/output definitions */
#include <string.h>  /* String function definitions */
#include <unistd.h>  /* UNIX standard function definitions */
#include <fcntl.h>   /* File control definitions */
#include <errno.h>   /* Error number definitions */
#include <termios.h> /* POSIX terminal control definitions */

#define MAX 256

/*int
ident_word(char *buf, char *word)
{

        switch (strstr())
        {
                case 0: printf();
        }
        return res;
}*/
void serial_init(int *fd, struct termios *options, struct termios *oldconf)
{
        if (*fd == -1)
                perror("open_port: Unable to open /dev/ttyUSB0 - ");
        else
                fcntl(*fd, F_SETFL, 0);
        tcgetattr(*fd, oldconf);
        memset(options, 0, sizeof(*options));


        cfsetispeed(options, B4800);
        cfsetospeed(options, B4800);

        options->c_cflag |= (CLOCAL | CREAD);
        options->c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
	options.c_oflag &= ~OPOST;
        options->c_cc[VMIN] = 0;
        options->c_cc[VTIME] = 10;
        tcflush(*fd, TCIFLUSH);
        tcsetattr(*fd, TCSANOW, options);
}
int
main()
{
        int fd;
/*      struct command
        {
                char instruct1[20], instruct2[4];
                int num;
        } command;*/
        char line[MAX], *word = "+CMTI", cmd_r[] = "AT+CMGR=0\r", cmd_d[] = "AT+CMGD=0,4\r", cmd_mode[] = "AT+CMGF=1\r", read_buf[MAX];
        memset(read_buf, 0, sizeof(read_buf));
        struct termios options, oldconf;

        fd = open("/dev/ttyUSB0", O_RDWR | O_NOCTTY | O_NDELAY);
        serial_init(&fd, &options, &oldconf);
        write(fd, cmd_mode, sizeof(cmd_mode));
        while (1) {
                while (read(fd, line, sizeof(line)) > 0) {
                        if (strstr(line, word) > 0) {
                                write(fd, cmd_r, sizeof(cmd_r));
                                read(fd, read_buf, sizeof(read_buf));
                                write(1, read_buf, sizeof(read_buf));
                                write(fd, cmd_d, sizeof(cmd_d));
                        }
                }
        }
        tcsetattr(fd, TCSANOW, &oldconf);
        return (0);
}