DC_PARSER_GET_FIELD(3)

DC_PARSER_GET_FIELD(3) | Library Functions Manual | DC_PARSER_GET_FIELD(3)

# NAME

`dc_parser_get_field` —
extract a field from a parsed dive

# LIBRARY

library “libdivecomputer”

# SYNOPSIS

`#include <libdivecomputer/parser.h>`

dc_status_t
`dc_parser_get_field`(dc_parser_t *parser, dc_field_type_t type, unsigned int flags, void *value);

# DESCRIPTION

Extract a field from a dive, parser, previously initialised with dc_parser_new(3). The value field type depends upon the type. The flags field is ignored for all types but `DC_FIELD_GASMIX` and `DC_FIELD_TANK`.

The type may be one of the following values:

`DC_FIELD_DIVETIME`
  Time (duration) of dive in seconds. The value must be an unsigned int.
`DC_FIELD_MAXDEPTH`
  Maximum depth in metres. The value must be a double.
`DC_FIELD_AVGDEPTH`
  Average depth (over all samples) in metres. The value must be a double.
`DC_FIELD_GASMIX_COUNT`
  Number of different gas mixes used in this dive. The value must be a unsigned int.
`DC_FIELD_GASMIX`
  Mixture for a particular gas. The value must be a dc_gasmix_t, which has double fields for oxygen, helium, and nitrogen. These are set to the unit fraction of gas (not percentage). The flags value is interpreted as the gas mixture index, which must be less than the value of `DC_FIELD_GASMIX_COUNT`.
`DC_FIELD_SALINITY`
  The water salinity as a dc_salinity_t field, which consists of a type, `DC_WATER_FRESH` or `DC_WATER_SALT`, and the salinity density.
`DC_FIELD_ATMOSPHERIC`
  Atmospheric pressure in bar. The value field must be a double.
`DC_FIELD_TEMPERATURE_SURFACE`
  Air temperature (at the surface) in Celsius. The value field must be a double.
`DC_FIELD_TEMPERATURE_MINIMUM`
  Minimum water temperature surface in Celsius. The value field must be a double.
`DC_FIELD_TEMPERATURE_MAXIMUM`
  Maximum water temperature in Celsius. The value field must be a double.
`DC_FIELD_TANK_COUNT`
  The number of tanks as an unsigned int.
`DC_FIELD_TANK`
  Tank configuration as a dc_tank_t. This structure consists of a gasmix, which may be retrieved with `DC_FIELD_GASMIX`; type, the tank volume units as `DC_TANKVOLUME_NONE`, `DC_TANKVOLUME_IMPERIAL`, or `DC_TANKVOLUME_METRIC`; volume, the tank volume in litres or zero if the tank is `DC_TANKVOLUME_NONE`; workpressure, the work pressure in bar or zero if `DC_TANKVOLUME_NONE` and maybe zero if `DC_TANKVOLUME_METRIC`; beginpressure and endpressure being the pressures at start and finish in bar. The flags value is the tank index.
`DC_FIELD_DIVEMODE`
  Mode of the dive: `DC_DIVEMODE_FREEDIVE` for free-diving, `DC_DIVEMODE_GAUGE` for gauge (i.e., running as a record and not computing, say, decompression events), `DC_DIVEMODE_OC` for standard open-circuit diving, and `DC_DIVEMODE_CCR` and `DC_DIVEMODE_SCR` for respectively closed circuit and semi closed circuit “rebreather” diving.

# RETURN VALUES

Returns `DC_STATUS_SUCCESS` if the field was retrieved, `DC_STATUS_UNSUPPORTED` if the field is not supported by the device, or other error messages on further failure.

# SEE ALSO

dc_parser_new(3)

# AUTHORS

The library “libdivecomputer” library was written by Jef Driesen, jef@libdivecomputer.org. The manpages were written by
Kristaps Dzonsons, kristaps@bsd.lv.

January 5, 2017 | NetBSD 10.0