Document and improve abstract reader/writer interface

.appveyor.yml

@@ -2,18 +2,13 @@ version: 0.6-build-{build}
 pull_requests:
   do_not_increment_build_number: true
 image:
-- Visual Studio 2015
-- Visual Studio 2013
 - Visual Studio 2017
+- Visual Studio 2019
 install:
 - cmd: >-
-    set tests=1
+    if /i "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2017" (call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" x86) & (set QTDIR=C:\Qt\5.13\msvc2017)
 
-    if /i "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2013" (call "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" amd64) & (set tests=0)
-
-    if /i "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2015" (call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x86) & (set QTDIR=C:\Qt\5.9\msvc2015)
-
-    if /i "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2017" (call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" x64) & (set QTDIR=C:\Qt\5.9\msvc2017_64)
+    if /i "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2019" (call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat" x64) & (set QTDIR=C:\Qt\6.1\msvc2019_64)
 
     set path=%PATH%;%QTDIR%\bin
 build_script:
@@ -22,14 +17,12 @@ build_script:
 
     cd tests
 
-    if /i "%tests%"=="1" qmake CONFIG-=release CONFIG+=debug
+    qmake CONFIG-=release CONFIG+=debug
 
-    if /i "%tests%"=="1" nmake -nologo -s
+    nmake -nologo -s
 test_script:
 - cmd: >-
-    if /i "%tests%"=="1" nmake -s -nologo TESTARGS=-silent check
-
-    if /i "%tests%"=="0" echo Tests skipped.
+    nmake -s -nologo TESTARGS=-silent check
 artifacts:
 - path: lib\tinycbor.lib
 deploy: off

.travis.yml

@@ -1,3 +1,11 @@
+env:
+  - BUILD_DOCS=false
+jobs:
+  include:
+    - # only build docs on main
+      if: branch = main
+      env: BUILD_DOCS=true
+
 language: cpp
 matrix:
   include:
@@ -67,7 +75,7 @@ script:
   - make -s -f Makefile.configure configure | tee .config
   - make -k
         CFLAGS="$CFLAGS -march=native -g1 -Wall -Wextra -Werror"
-        CPPFLAGS="-DNDEBUG"
+        CPPFLAGS="-DNDEBUG -DCBOR_ENCODER_WRITER_CONTROL=-1 -DCBOR_PARSER_READER_CONTROL=-1"
         lib/libtinycbor.a
   - size lib/libtinycbor.a | tee sizes
   - make -s clean
@@ -81,4 +89,4 @@ script:
         (cd tests && make TESTARGS=-silent check -k
         TESTRUNNER=`which valgrind 2>/dev/null`)
   - make -s clean
-  - ./scripts/update-docs.sh
+  - ! [ $BUILD_DOCS ] || ./scripts/update-docs.sh

Makefile

@@ -236,7 +236,10 @@ tag: distcheck
 .SECONDARY:
 
 cflags := $(CPPFLAGS) -I$(SRCDIR)src
-cflags += -std=gnu99 $(CFLAGS)
+cflags += -std=gnu99 $(CFLAGS) \
+	-Werror=incompatible-pointer-types \
+	-Werror=implicit-function-declaration \
+	-Werror=int-conversion
 %.o: %.c
 	@test -d $(@D) || $(MKDIR) $(@D)
 	$(CC) $(cflags) $($(basename $(notdir $@))_CCFLAGS) -c -o $@ $<