dirent

Dirent -- Get directory entry information

int dirent (buffer, offset, doffset, bytcount, numsamps, sampsiz)

ADB *buffer ;

unsigned short offset, *doffset, *bytcount, *numelts, *eltsiz ;

PURPOSE

Locates the directory entry located offset bytes from the beginning of the ADB and returns the directory entry information.

INPUTS

buffer

ADB

offset

offset to directory entry

doffset

offset to data_set

bytcount

number of bytes stored in data_set

numsamps

max no. of samples which may be stored

sampsiz

size of one data sample

OUTPUTS

All the information in the directory is returned:

doffset

the offset to the data_set

bytcount

the number of bytes currently stored in the data_set

numsamps

the maximum number of samples which may be stored in the data_set

sampsiz

the size of one sample

PARACODE

BOOL dirent (buffer, offset, doffset, bytcount, numelts, eltsiz) get the directory entry - dir_ent = buffer[offset/2] doffset = data_offset field of dir_ent bytcount = byte_count field of dir_ent numelts = num_of_elements field of dir_ent eltsiz = element_size field of dir_ent

CODE

/* FILE: DIRENT.C */ #include #include "air.h" BOOLE dirent (buffer, offset, doffset, bytcount, numelts, eltsiz) ADB *buffer ; unsigned short offset ; /* offset to directory entry */ unsigned short *doffset ; /* offset to data set */ unsigned short *bytcount ; /* number of bytes stored in data set */ unsigned short *numelts ; /* max no. of elements which may be stored */ unsigned short *eltsiz ; /* size of one data element */ { DIR_ENTRY *entry ; entry = (DIR_ENTRY *)&buffer[offset/2] ; *doffset = entry->data_offset ; *bytcount = entry->byte_count ; *numelts = entry->num_of_elements ; *eltsiz = entry->element_size ; }