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const'ify our strtod() helper functions

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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>
This commit is contained in:
Linus Torvalds 2014-01-08 14:51:22 +08:00 • committed by Dirk Hohndel
parent 19b982d3df
commit 2d1d78ebfe
4 changed files with 11 additions and 11 deletions
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2
dive.h
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@ -806,7 +806,7 @@ 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)