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Due to the integer promotion rules of the C language, the unsigned char values are promoted to a signed integer (and not an unsigned integer) before being shifted. But the result of a left shift on a signed type is undefined if the resulting value can't be represented in the signed type. GCC's Undefined Behavior Sanitizer (ubsan), enabled with the option -fsanitize=undefined, detects this type of problem at runtime with the following warning: "left shift of X by Y places cannot be represented in type 'int'". Fixed with an explicit cast to unsigned integer.
Overview ======== Libdivecomputer is a cross-platform and open source library for communication with dive computers from various manufacturers. The official web site is: http://www.libdivecomputer.org/ The sourceforge project page is: http://sourceforge.net/projects/libdivecomputer/ Installation ============ On UNIX-like systems (including Linux, Mac OS X, MinGW), use the autotools based build system. Run the following commands from the top directory (containing this file) to configure, build and install the library and utilities: $ ./configure $ make $ make install If you downloaded the libdivecomputer source code directly from the git source code repository, then you need to create the configure script as the first step: $ autoreconf --install To uninstall libdivecomputer again, run: $ make uninstall Support ======= Please send bug reports, feedback or questions to the mailing list: http://libdivecomputer.org/cgi-bin/mailman/listinfo/devel or contact me directly: jef@libdivecomputer.org License ======= Libdivecomputer is free software, released under the terms of the GNU Lesser General Public License (LGPL). You can find a copy of the license in the file COPYING.