Here are the data structures with brief descriptions:

[detail level 12]

Carg
Carglst
CARRAYDAT
Cauxch
CcontrolChannelHints_s	This structure holds the parameter hints for control channels
CcontrolChannelInfo_s
CCORFIL
CCS_AUDIODEVICE	Device information
CCS_MIDIDEVICE
Ccsdebug_data_s
Ccshdr
▼CCSOUND_	Contains all function pointers, data, and data pointers required to run one instance of Csound
ClibsndStatics__
ClineventStatics__
CmusmonStatics__
ConefileStatics__
CsreadStatics__
CCSOUND_PARAMS	Csound configuration structure, mirrors part of OPARMS, uses more meaningful names
CCsoundRandMTState_
CcsRtAudioParams	Real-time audio parameters structure
Cdebug_bkpt_info_t
Cdebug_instr_s
Cdebug_opcode_s
Cdebug_variable_s
Cdklst
CDOWNDAT
CDPARM
CDPEXCL
Cengine_state	This struct will hold the current engine state after compilation
CEVENT
Cevent	This struct holds the data for one score event
Ceventnode
CEVLIST
Cfdch
CFGDATA
CFUNC
CGEN01ARGS
Cin_stack_s
Cinsds	This struct holds the info for a concrete instrument event instance in performance
Cinstr	This struct is filled out by otran() at orch parse time
Clblblk
Cmarked_sections
Cmchnblk
CMEMFIL
CMEVENT
Cmidiglobals
CMIDIMESSAGE
CMODULE_INFO	Plugin module info
Cmonblk
CNAME__
CnamedInstr
Cnamelst
Cnames
CNGFENS
COCTDAT
Coentries
Coentry
Cop	A chain of TEXT structs
COPARMS
CopcodeListEntry
Copcodinfo
Copds	This struct holds the info for one opcode in a concrete instrument instance in performance
CORCTOKEN
Cpvsdat_ext
Cpvx_memfile_
CRTCLOCK_S
CS_MACRO
CSNDMEMFILE_
CSPECDAT
CSTRINGDAT
CTABDAT
CTEMPO
Ctext	Storage for parsed orchestra code, for each opcode in an INSTRTXT
CthreadInfo
CTREE