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Localization: Make Qt's locale-aware formatting accessible from C

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This commit introduces functions:
 - QString asprintf_loc(const char *cformat, ...);
 - int snprintf_loc(char *dst, size_t size, const char *cformat, ...);
 - put_format_loc(struct membuffer *, const char *fmt, ...);
and their va_arg equivalents, which use Qt's QString::arg() formatting
options to render the strings.

The snprintf_loc() function takes care not to truncate multi-byte
UTF-8 encodings. Thus, on overflow, the resulting string might be
shorter than size-1.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2018-02-21 22:35:50 +01:00 • committed by Robert C. Helling
parent 9a8a0afa29
commit bec3e80683
4 changed files with 421 additions and 3 deletions
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14
core/qthelper.h
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@ -6,7 +6,13 @@
#include "dive.h"
#include "divelist.h"
// 1) Types
// 1) Types and macros
#ifdef __GNUC__
#define __printf(x, y) __attribute__((__format__(__printf__, x, y)))
#else
#define __printf(x, y)
#endif
enum inertgas {N2, HE};
@ -47,6 +53,9 @@ void init_proxy();
QString getUUID();
QStringList imageExtensionFilters();
char *intdup(int index);
__printf(1, 2) QString asprintf_loc(const char *cformat, ...);
__printf(1, 0) QString vasprintf_loc(const char *cformat, va_list ap);
#endif
// 3) Functions visible to C and C++
@ -81,10 +90,11 @@ void cache_insert(int tissue, int timestep, enum inertgas gas, double value);
void print_qt_versions();
void lock_planner();
void unlock_planner();
__printf(3, 4) int snprintf_loc(char *dst, size_t size, const char *cformat, ...);
__printf(3, 0) int vsnprintf_loc(char *dst, size_t size, const char *cformat, va_list ap);
#ifdef __cplusplus
}
#endif
#endif // QTHELPER_H