Module cb 

FFI callback functions invoked by the ReadStat C library during parsing.

The ReadStat C parser uses a callback-driven architecture: as it reads a .sas7bdat file, it invokes registered callbacks for metadata, variables, and values. Each callback receives a raw *mut c_void context pointer that is cast back to the appropriate Rust struct (ReadStatMetadata or ReadStatData) to accumulate parsed results.

Enums

ReadStatHandler 🔒

Return codes for ReadStat C callback functions.

Constants

DAY_SHIFT 🔒

SAS epoch (1960-01-01) to Unix epoch (1970-01-01) offset in days.

ROUND_SCALE 🔒

Scale factor for rounding: 10^DECIMAL_PLACES, computed once.

SEC_SHIFT 🔒

SAS epoch to Unix epoch offset in seconds.

Functions

handle_metadata 🔒

FFI callback that extracts file-level metadata from the ReadStat C parser.

handle_value 🔒

FFI callback that extracts a single cell value during row parsing.

handle_variable 🔒

FFI callback that extracts per-variable metadata from the ReadStat C parser.

round_decimal_f32 🔒

Rounds an f32 to [DECIMAL_PLACES] decimal places using pure arithmetic.

round_decimal_f64 🔒

Rounds an f64 to [DECIMAL_PLACES] decimal places using pure arithmetic.