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Quoting the man page of vsnprintf:
RETURN VALUE
Upon successful return, these functions return the number of characters printed
(excluding the null byte used to end output to strings).
The functions snprintf() and vsnprintf() do not write more than size bytes (including
the terminating null byte ('\0')). If the output was truncated due to this limit,
then the return value is the number of characters (excluding the terminating null
byte) which would have been written to the final string if enough space had been
available. Thus, a return value of size or more means that the output was truncated.
(See also below under NOTES.)
If an output error is encountered, a negative value is returned.
[...]
The glibc implementation of the functions snprintf() and vsnprintf() conforms to the
C99 standard, that is, behaves as described above, since glibc version 2.1. Until
glibc 2.0.6, they would return -1 when the output was truncated.
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| .. | ||
| aio.cpp | ||
| datafile.cpp | ||
| fs.cpp | ||
| git_revision.cpp | ||
| hash.cpp | ||
| jobs.cpp | ||
| json.cpp | ||
| mapbugs.cpp | ||
| name_ban.cpp | ||
| str.cpp | ||
| strip_path_and_extension.cpp | ||
| teehistorian.cpp | ||
| test.cpp | ||
| test.h | ||
| thread.cpp | ||
| unix.cpp | ||