const'ify our strtod() helper functions

The C library doesn't use const char pointers for legacy reasons (and
because you *can* modify the string the end pointer points to), but
let's do it in our internal implementation just because it's a nice
guarantee to have.

We actually used to have a non-const end pointer and replace a decimal
comma with a decimal dot, but that was because we didn't have the fancy
"allow commas" flags.  So by using our own strtod_flags() function, we
can now keep all the strings we parse read-only rather than modify them
as we parse them.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/dive.h b/dive.h
index a0c22935f..11afa99b1 100644
--- a/dive.h
+++ b/dive.h
@@ -789,7 +789,7 @@ extern void remove_weightsystem(struct dive *dive, int idx);
 #define STRTOD_NO_DOT		0x02
 #define STRTOD_NO_COMMA		0x04
 #define STRTOD_NO_EXPONENT	0x08
-extern double strtod_flags(char *str, char **ptr, unsigned int flags);
+extern double strtod_flags(const char *str, const char **ptr, unsigned int flags);
 
 #define STRTOD_ASCII (STRTOD_NO_COMMA)