Add unit-aware cylinder size string parserc

Whittling down on the string parsing that doesn't check user-specified
units.  Still need to handle temperatures (and will do percentages to
match the pattern too), but this is getting us closer to always honoring
user-specified units.

With this you can say that you have a "10l" cylinder at "3000psi", and
it will do the right thing (it's basically a 72 cuft cylinder in
imperial measurements).

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/dive.h b/dive.h
index ca717704c..f7d1c04b3 100644
--- a/dive.h
+++ b/dive.h
@@ -819,6 +819,7 @@ extern double strtod_flags(const char *str, const char **ptr, unsigned int flags
 extern weight_t string_to_weight(const char *str);
 extern depth_t string_to_depth(const char *str);
 extern pressure_t string_to_pressure(const char *str);
+extern volume_t string_to_volume(const char *str, pressure_t workp);
 
 #include "pref.h"