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mocchiut |
1.1 |
/***************************************************************
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*
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* routine read_ev: routine to extract an event information
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* from file acquired with Pamela acquisition programs
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*
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* June 2002
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*
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***************************************************************/
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/*
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* include needed system headers
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*/
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#include <stdio.h> /* include standard i/o library */
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#include <stdlib.h> /* include standard library */
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#include <string.h> /* include string library */
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#include <unistd.h> /* include unix standard library */
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#include <sys/types.h> /* */
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#include <sys/stat.h> /* */
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#include <fcntl.h> /* */
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#include <errno.h> /* error simbol definitions */
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#include <time.h> /* system time definitions */
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#include <math.h> /* math library */
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void readev_(long *evnum, long *systime, long *len, unsigned short *data, int *error, int *fd)
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{
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long header;
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const char *hdr = (char *)&header;
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*error = 0;
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/* search the header */
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*error = read(*fd,&header,sizeof(long)) == sizeof(long) ? 0 : -1;
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while (!(*error) && (header != 0xaaaaaaaa)) {
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header >>= 8;
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*error = read(*fd,hdr+3,sizeof(char)) == sizeof(char) ? 0 : -1;
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}
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if (*error) return; /* file read error searching the header: exit */
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/* read the event number */
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*error = read(*fd,evnum,sizeof(long)) == sizeof(long) ? 0 : -1;
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if (*error) return; /* error reading the event number: exit */
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printf ("%d \n", evnum);
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/* read the system time */
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*error = read(*fd,systime,sizeof(long)) == sizeof(long) ? 0 : -1;
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if (*error) return; /* error reading the system time: exit */
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printf ("%d \n", systime);
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/* read the event length */
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*error = read(*fd,len,sizeof(long)) == sizeof(long) ? 0 : -1;
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if (*error) return; /* error reading the event length: exit */
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printf ("%d \n", len);
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/* read the packet */
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*error = read(*fd,data,sizeof(char)*(*len)) == sizeof(char)*(*len) ? 0 : -1;
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if (*error) return; /* error reading the event length: exit */
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swab(data,data,*len);
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*error = 0;
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}
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