tracker/readraw/readtrailer.c

/*
 * include needed system headers
 */
#include <stdio.h>       /* include standard i/o library */
#include <stdlib.h>      /* include standard library */
#include <string.h>      /* include string library */
#include <unistd.h>      /* include unix standard library */
#include <sys/types.h>   /* */
#include <sys/stat.h>    /* */
#include <fcntl.h>       /* */
#include <errno.h>       /* error simbol definitions */
#include <time.h>        /* system time definitions */
#include <math.h>        /* math library */

void readtrailer_(unsigned short *trailer, int *error, int *fd)

{
    int nread;
    int i;
    unsigned short word;

    *error=0;

/*** read the buffer ***/
    nread=read(*fd, trailer, 2*3);//il trailer e' lungo 6 parole da 8 bits
    if( nread==0 ) {
        printf("readtrailer: Unexpected end of file %d at %d \n",*fd,nread);
        *error=1;
        return ;
    }
    if ( nread != 6) {
        printf("readtrailer: Error on reading: nread = %d \n",nread);
        *error=-1;
        return ; 
    }


/*** correct byte ***/ //endianess...
    for(i=0; i<3; i++) {
        word = trailer[i];
        trailer[i] = ( (word&0x00ff) << 8 ) | ( (word&0xff00) >> 8 );
    }

//    for( i=0; i<3; i++) printf("%x \n",trailer[i]);//???

    return; 
}
1	/*
2	* include needed system headers
3	*/
4	#include <stdio.h> /* include standard i/o library */
5	#include <stdlib.h> /* include standard library */
6	#include <string.h> /* include string library */
7	#include <unistd.h> /* include unix standard library */
8	#include <sys/types.h> /* */
9	#include <sys/stat.h> /* */
10	#include <fcntl.h> /* */
11	#include <errno.h> /* error simbol definitions */
12	#include <time.h> /* system time definitions */
13	#include <math.h> /* math library */
14
15	void readtrailer_(unsigned short trailer, int error, int *fd)
16
17	{
18	int nread;
19	int i;
20	unsigned short word;
21
22	*error=0;
23
24	/* read the buffer */
25	nread=read(fd, trailer, 23);//il trailer e' lungo 6 parole da 8 bits
26	if( nread==0 ) {
27	printf("readtrailer: Unexpected end of file %d at %d \n",*fd,nread);
28	*error=1;
29	return ;
30	}
31	if ( nread != 6) {
32	printf("readtrailer: Error on reading: nread = %d \n",nread);
33	*error=-1;
34	return ;
35	}
36
37
38	/* correct byte */ //endianess...
39	for(i=0; i<3; i++) {
40	word = trailer[i];
41	trailer[i] = ( (word&0x00ff) << 8 ) \| ( (word&0xff00) >> 8 );
42	}
43
44	// for( i=0; i<3; i++) printf("%x \n",trailer[i]);//???
45
46	return;
47	}