station_search.c

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/*****************************************************************************\
*  bs_hbook5()                                                                *
*******************************************************************************
*  Bs_hb5() performs a binary search on a sorted file of handbook5 structures.* 
*  The sorted file of max_recs structures is on the RAMDISK in the            *
*  /tmp/HANDBOOK5.DAT file. Bs_hb5() tries to match a requested id with the   *
*  actual ids that are in the HANDBOOK5.DAT file. The requested ID is the     *
*  hb5_pc argument. Hb5_pc is a contatenation of Handbook 5 ID and Parameter  *
*  Code. If a matching record is found in the HANDBOOK5.DAT file, the matching*
*  record is returned. Otherwise, the return value is a handbook5 structure   *
*  that contains the value CNOT_USED.                                         *
*                                           Andy Morin - CNRFC  10/10/92      *
*                  Converted to QNX 4.2   Wayne Martin - CNRFC  01/30/95      *
\*****************************************************************************/
 
#include  "prototypes.h"
 
#define   NO   0x00
#define  YES   0x01
#define  LMAX  17L
 
int station_search(unsigned long index,struct sensor_file *sfile)
 
{
 
    size_t  rec_size;
    size_t  erv, rv;
    signed long offset;
    char error_msg[100];
    struct error_message err;
 
    rec_size = (size_t)sizeof(struct sensor_file);
    erv = rec_size;
 
    offset=(signed long)index * rec_size;
 
    rv = dbread(NSENSOR_FILE, offset, rec_size, 1L, &sfile->sid);
 
    if(rv != erv)  {
            sprintf(error_msg, "Read error NSENSOR_FILE,offset=%ld", offset);
            mk_err_msg("station_search", error_msg, &err);
            offset = dbsize(NERRORLOG);
            dbwrite(NERRORLOG, offset, sizeof(struct error_message), 1L, &err);
            exit(EXIT_FAILURE);
        }
 
        return(0);
   
 }