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libssc Developers Guide

0. Prerequisites

  • gcc(1) or clang(1)
  • bash(1)
  • indent(1) (optional)
  • make(1) (optional)

1. External Usage

This document is intended for libssc developers working on the internals of the library. Please see api.md for the porcelain/public interfaces for integrating and using this library in your project or application.

Please check the LICENSE to ensure this library and its license meet your needs.

2. Contributing

Contributions to libssc can be made with a new pull request opened on this library's canonical repository.

If you have discovered an bug or want to open up a discussion, please open an issue on this library's canonical repository.

Please be sure to review the following before committing or opening a pull request to the libssc project:

3. Coding Rules

libssc uses the FFmpeg Coding Rules developer guidelines in this project with exceptions outlined in this section. For clarity, some rules are repeated here to give a clear context of expectations for developers contributing to this library.

Code Format Conventions

TODO

Indentation

The following outlines indentation requirements for files in the project:

  • Indent size is 2
  • The TAB character is forbidden with the exceptions of Makefile files

Naming Conventions

This section describes various naming conventions used in libssc.

Namespacing

All types, structs, functions, variables, and macros exported for public usage should be namespaced with ssc_, SSC, or SSC_ depending on the defined interface.

Types

All exported types should be PascalCamelCase and prefixed with the SSC namespace.

Example:

typedef unsigned char * SSCByte

Structs

All exported structs should be PascalCamelCase and prefixed with the SSC namespace.

Example:

struct SSCBuffer {
  SSCBytes bytes;
  SSCUSize size;
};

Functions

All exported functions and preprocessor functions should be snake_case and prefixed with the ssc_ namespace.

Example:

#define ssc_buffer(value) (SSCBuffer) (value)
SSC_EXPORT const SSCResult
ssc_buffer_compare (const SSCBuffer self, const SSCBuffer right);

Variables

All globally (static) exported, externally (extern) linked, or preprocessor macro variables should be snake_case and prefixed with the ssc_ namespace.

Example:

static SSCBoolean ssc_some_boolean = SSC_FALSE;
extern SSCString *ssc_some_extern_string = 0;
#define ssc_argc ssc_init_argc
#define ssc_argv ssc_init_argv

Preprocessor Macros

All preprocessor macros should be SCREAMING_SNAKE_CASE and prefixed with the SSC_ namespace.

Example:

#define SSC_VSNPRINTF vsnprintf
#define SSC_PP_STRING(value) SSC_PP_STRINGX(value)
#define SSC_PP_STRINGX(value) #value

4. Development

TODO

Program Crashes

TODO

Ubuntu

TODO

Debugging

TODO

Apport

TODO

GDB

TODO

5. Tests

Tests are single context executables that emit TAP output. Tests make use of a self hosted <ssc/test.h> header file that provides various macros and functions for making assertions that output TAP compliant logs.

Running Tests

The runner for each test can be invoke with a make target from the root of the repository.

make tests/$TARGET

where $TARGET is the test to run which corresponds to a single .c file in the tests/ directory.

Example:

Run string and uri tests:

make tests/string tests/uri

Run many tests with brace expansion:

make tests/{string,ipc,uri,error}

All tests can be run by simply invoking:

make tests

<ssc/test.h> API

This section describes the C API exposed by the <ssc/test.h>

test(name, expected)

A simple TAP test runner context.

  • name The name of the test context
  • expected The expected number of passed tests. 0 means there is no expected count.

Example:

#include <ssc/test.h>

test("a simple test", 2) {
  assert(1 + 1 == 2);
  assert_equal(2, 2);
  assert_not_equal(2, 3);
}

Output:

TAP version 14
# a simple test
1..3
ok 1 - 1 + 1 == 2
ok 2 - 2 equals 2
ok 3 - 2 not equals 3

xtest(name, expected)

A simple macro to skip tests instead of running them marked by the leading x character in test(...)

Example:

#include <ssc/test.h>

xtest("a simple skipped test", 3) {
  assert(1 + 1 == 2);
  assert_equal(2, 2);
  assert_not_equal(2, 3);
}

Output:

TAP version 14
# a simple skipped test
1..0

assert(condition, ...)

A simple assertion that emits ok ... or not ok ...

Example:

assert(1 + 1 == 3);
assert(1 != 2);

assert_ok(condition, ...)

A simple assertion that emits ok ... or not ok ... along with a caught error that is printed as a TAP error

Example:

#include <ssc/test.h>

test("error", 0) {
  assert_ok(ssc_throw(SSC_ERROR, "ooops"));
}

Output:

TAP version 14
# error
ok 1 (SSCResult) (SSC_OK)
not ok 1 - ssc_error_throw( SSC_ERROR, "ooops", (SSCString)("error.c"), (SSCUSize) (35), (SSCString)(__PRETTY_FUNCTION__) ) [runner (error.c:35)]
  ---
  message: (runner): ooops
  severity: fail
  at:
    file: error.c
    line: 35
  ---
1..2
# tests 2
# fail 1
# pass 1

assert_notok(condition, ...)

A simple negated assertion that emits ok ... or not ok ... along with a caught error that is printed as a TAP error

Example:

#include <ssc/test.h>

test("error", 0) {
  assert_notok(ssc_throw(SSC_ERROR, "oops"));
}

Output:

TAP version 14
# error
ok 1 - ssc_error_throw( SSC_ERROR, "oops", (SSCString)("error.c"), (SSCUSize) (35), (SSCString)(__PRETTY_FUNCTION__) )
not ok 2 - (SSCResult) (SSC_OK) [runner (error.c:36)]
  ---
  message: (runner): oops
  severity: fail
  at:
    file: error.c
    line: 35
  ---
1..2
# tests 2
# fail 1
# pass 1

assert_equal(left, right, ...)

A simple assertion that emits ok ... or not ok ... based on the given left and right values inequality being true.

Example:

test("error", 0) {
  assert_equal(1, 1);
  assert_equal(2, 2);
}

assert_not_equal(left, right, ...)

A simple assertion that emits ok ... or not ok ... based on the given left and right values equality being true.

Example:

test("error", 0) {
  assert_not_equal(1, 2);
  assert_not_equal(2, 3);
}

ok(format, ...)

Simple ok() emission for a passed test.

Example:

test("ok", 0) {
  ok("a test passed");
}

notok(format, ...)

Simple notok() emission for a failed test.

Example:

test("notok", 0) {
  notok("a test failed");
}

okskip(format, ...)

Simple skipped ok() with '#SKIP' emission for a pending test.

Example:

test("okskip", 0) {
  okskip("a skipped test assertion");
}

notokskip(format, ...)

Simple skipped notok() with '#SKIP' emission for a pending test.

Example:

test("okskip", 0) {
  notokskip("a skipped failing test assertion");
}

oktodo(format, ...)

Simple skipped ok() with '#TODO' emission for a pending test.

Example:

test("oktodo", 0) {
  oktodo("a pending test assertion marked as TODO");
}

notoktodo(format, ...)

Simple skipped notok() with '#TODO' emission for a pending test.

Example:

test("oktodo", 0) {
  notoktodo("a pending failed test assertion marked as TODO");
}