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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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3
core/membuffer.h
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@ -22,6 +22,7 @@ struct membuffer {
extern char *detach_buffer(struct membuffer *b);
extern void free_buffer(struct membuffer *);
extern void make_room(struct membuffer *b, unsigned int size);
extern void flush_buffer(struct membuffer *, FILE *);
extern void put_bytes(struct membuffer *, const char *, int);
extern void put_string(struct membuffer *, const char *);
@ -29,7 +30,9 @@ extern void put_quoted(struct membuffer *, const char *, int, int);
extern void strip_mb(struct membuffer *);
extern const char *mb_cstring(struct membuffer *);
extern __printf(2, 0) void put_vformat(struct membuffer *, const char *, va_list);
extern __printf(2, 0) void put_vformat_loc(struct membuffer *, const char *, va_list);
extern __printf(2, 3) void put_format(struct membuffer *, const char *fmt, ...);
extern __printf(2, 3) void put_format_loc(struct membuffer *, const char *fmt, ...);
extern __printf(2, 0) char *add_to_string_va(const char *old, const char *fmt, va_list args);
extern __printf(2, 3) char *add_to_string(const char *old, const char *fmt, ...);