Check and use return value of fread(), also check ftell() #184

	name: C/C++ CI
	concurrency:
	group: ${{ github.workflow }}-${{ github.event.pull_request.number \|\| github.sha }}
	cancel-in-progress: true

	on:
	push:
	branches: trunk
	paths:
	- '**'
	- '!**.md'
	- '!docs/**'
	- '!**.yml'
	- '**/c-cpp.yml'
	pull_request:
	branches: trunk
	paths:
	- '**'
	- '!**.md'
	- '!docs/**'
	- '!**.yml'
	- '**/c-cpp.yml'

	jobs:
	linux:
	strategy:
	fail-fast: false
	matrix:
	cc: [gcc-9, gcc-11, clang-13, clang-14]
	runs-on: ubuntu-latest
	env:
	CC: ${{ matrix.cc }}
	steps:
	- uses: actions/checkout@v4

	- name: Fix kernel mmap rnd bits
	# Asan in llvm 14 provided in ubuntu 22.04 is incompatible with
	# high-entropy ASLR in much newer kernels that GitHub runners are
	# using leading to random crashes: https://reviews.llvm.org/D148280
	run: sudo sysctl vm.mmap_rnd_bits=28

	- name: Install dependencies
	run: \|
	# sudo apt remove -y firefox
	sudo apt update
	# sudo apt upgrade -y
	sudo apt install -y meson ninja-build $CC

	- name: Build
	run: \|
	meson setup _build -Db_sanitize=address,undefined -Db_lundef=false
	cd _build
	ninja
	- name: Test
	run: cd _build && meson test -v

	macos:
	runs-on: macos-latest
	steps:
	- uses: actions/checkout@v4
	- run: brew install meson
	- run: \|
	meson setup _build -Db_sanitize=address,undefined -Db_lundef=false
	cd _build
	ninja
	meson test -v

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