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author | wm4 <wm4@nowhere> | 2017-07-24 08:07:32 +0200 |
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committer | wm4 <wm4@nowhere> | 2017-07-24 08:12:42 +0200 |
commit | 24dc91907a039b7a86bf6d5b2a0a914bf1f44c3d (patch) | |
tree | 0aeb8046536a1d2a799d352112418960387cc94d /common/common.h | |
parent | 3d0f86145ce211eee623b661d558ef3405d75933 (diff) | |
download | mpv-24dc91907a039b7a86bf6d5b2a0a914bf1f44c3d.tar.bz2 mpv-24dc91907a039b7a86bf6d5b2a0a914bf1f44c3d.tar.xz |
common, vo_opengl: add/use helper for formatted strings on the stack
Seems like I really like this C99 idiom. No reason not to generalize it
do snprintf(). Introduce mp_tprintf(), which basically this idiom to
snprintf(). This macro looks like it returns a string that was allocated
with alloca() on the caller site, except it's portable C99/C11. (And
unlike alloca(), the result is valid only within block scope.)
Use it in 2 places in the vo_opengl code. But it has the potential to
make a whole bunch of weird looking code look slightly nicer.
Diffstat (limited to 'common/common.h')
-rw-r--r-- | common/common.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/common/common.h b/common/common.h index 4f944c99ba..fb40d251f1 100644 --- a/common/common.h +++ b/common/common.h @@ -101,4 +101,12 @@ char *mp_strerror_buf(char *buf, size_t buf_size, int errnum); char *mp_tag_str_buf(char *buf, size_t buf_size, uint32_t tag); #define mp_tag_str(t) mp_tag_str_buf((char[22]){0}, 22, t) +// Return a printf(format, ...) formatted string of the given SIZE. SIZE must +// be a compile time constant. The result is allocated on the stack and valid +// only within the current block scope. +#define mp_tprintf(SIZE, format, ...) \ + mp_tprintf_buf((char[SIZE]){0}, (SIZE), (format), __VA_ARGS__) +char *mp_tprintf_buf(char *buf, size_t buf_size, const char *format, ...) + PRINTF_ATTRIBUTE(3, 4); + #endif /* MPLAYER_MPCOMMON_H */ |