Experiments and short programs written in C.
- Docker or
- Your preferred way of compiling C (e.g GCC).
The following command will build an image that can compile and run C programs,
will bind this project folder to the container's /home/source/ and
it will keep the container alive indefinetly so that the project can be worked on.
docker compose up --detachThen access the container using the ID if known or the name which will always be clang:
docker exec -it clang /bin/bashWith access to the container switch the directory to find the project files e.g:
cd /home/source/helloCompile programs and run binaries as needed:
# Compile the program:
gcc -o main ./main.c
# or with clang:
clang -g -Wall -std=c99 -o main ./main.c
# Run the program:
./mainThe command can also be combined so that it tries to run after it is compiled:
clang -g -Wall -std=c99 -o main ./main.c && ./mainWhen done, exit the interactive terminal with Ctrl+C and remove the containers or type exit:
docker compose downPrograms can also be inspected for memory leaks using valgrind <file>:
root@567cbfe975b0:/home/project/source/malloc# valgrind ./main
==40== Memcheck, a memory error detector
==40== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==40== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==40== Command: ./main
==40==
source: hello
target: Hello
==40==
==40== HEAP SUMMARY:
==40== in use at exit: 0 bytes in 0 blocks
==40== total heap usage: 2 allocs, 2 frees, 1,030 bytes allocated
==40==
==40== All heap blocks were freed -- no leaks are possible
==40==
==40== For counts of detected and suppressed errors, rerun with: -v
==40== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)The clang static analyzer can also be used with scan-build:
scan-build clang main.cThe output should look similar to the following:
root@3fc228fa345f:/home/project/source/arrays# scan-build clang main.c
scan-build: Using '/usr/lib/llvm-16/bin/clang' for static analysis
scan-build: Analysis run complete.
scan-build: Removing directory '/tmp/scan-build-2024-01-14-233048-110-1' because it contains no reports.
scan-build: No bugs found.
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