[R-pkg-devel] truncating strings on purpose
? Wed, 11 Dec 2024 12:12:11 +0000 Brad Eck <bradleyjeck at gmail.com> ?????:
Found the following significant warnings:
input2.c:863:5: warning: ?__builtin_strncpy? output may be
truncated copying 225 bytes from a string of length 255
[-Wstringop-truncation]
Where the truncation warnings appear, I am truncating on purpose using `strncpy` to avoid overflows later. I believe this works fine from an application point of view but the warnings remain.
GCC documentation suggests setting the length argument to _one less_ than sizeof destination buffer in addition to terminating the string: https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Warning-Options.html#index-Wstringop-truncation strncpy(trunc_s1, s1, sizeof trunc_s1 - 1); trunc_s1[sizeof trunc_s1 - 1] = '\0';
Best regards, Ivan