The problem is you're relying upon undefined behaviour for memcpy(3):
size_t skip = strlen(other);
ssize_t index = 1;
ssize_t next = 87;
size_t tail = 1;
memcpy(buf + tail, buf + index + skip, next - index - skip);
The memory areas overlap, which invokes the undefined behaviour; see the
standard definition here
http://pubs.opengroup.org/onlinepubs/009695399/functions/memcpy.html and
a common manpage used for the glibc implementation here
http://man7.org/linux/man-pages/man3/memcpy.3.html
If you wish to use overlapping source and destination, then you should
use memmove(3) instead.
Thanks
** Changed in: glibc (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1441421
Title:
compatibility issue in libc6:i386
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