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Simplify string comparison

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This is based on Linus' idea on the mailing list.
Treat NULL strings and empty strings as identical.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Dirk Hohndel 2014-05-06 14:08:17 -07:00
parent 024420a60d
commit 0c836ebc47
3 changed files with 12 additions and 15 deletions
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6
dive.h
View file

@ -7,6 +7,7 @@
#include <math.h>
#include <zip.h>
#include <sqlite3.h>
#include <string.h>
/* Windows has no MIN/MAX macros - so let's just roll our own */
#define MIN(x, y) ({ \
@ -23,6 +24,11 @@
#define IS_FP_SAME(_a, _b) (fabs((_a) - (_b)) < 0.000001 * MAX(fabs(_a), fabs(_b)))
static inline int same_string(const char *a, const char *b)
{
return !strcmp(a ? : "", b ? : "");
}
#include <libxml/tree.h>
#include <libxslt/transform.h>

10
equipment.c
View file

@ -71,14 +71,6 @@ bool cylinder_none(void *_data)
return cylinder_nodata(cyl) && cylinder_nosamples(cyl);
}
/* descriptions are equal if they are both NULL or both non-NULL
and the same text */
static bool description_equal(const char *desc1, const char *desc2)
{
return ((!desc1 && !desc2) ||
(desc1 && desc2 && strcmp(desc1, desc2) == 0));
}
bool weightsystem_none(void *_data)
{
weightsystem_t *ws = _data;
@ -98,7 +90,7 @@ bool no_weightsystems(weightsystem_t *ws)
static bool one_weightsystem_equal(weightsystem_t *ws1, weightsystem_t *ws2)
{
return ws1->weight.grams == ws2->weight.grams &&
description_equal(ws1->description, ws2->description);
same_string(ws1->description, ws2->description);
}
bool weightsystems_equal(weightsystem_t *ws1, weightsystem_t *ws2)

11
qt-ui/maintab.cpp
View file

@ -856,12 +856,11 @@ void MainTab::rejectChanges()
// this macro is rather fragile and is intended to be used as WHAT inside
// an invocation of EDIT_SELECTED_DIVES(WHAT)
#define EDIT_TEXT(what, text) \
if ((!mydive->what && !current_dive->what) || \
(mydive->what && current_dive->what && strcmp(mydive->what, current_dive->what) == 0)) { \
QByteArray textByteArray = text.toUtf8(); \
free(mydive->what); \
mydive->what = strdup(textByteArray.data()); \
#define EDIT_TEXT(what, text) \
if (same_string(mydive->what, current_dive->what)) { \
QByteArray textByteArray = text.toUtf8(); \
free(mydive->what); \
mydive->what = strdup(textByteArray.data()); \
}
#define EDIT_VALUE(what, value) \