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Merge pull request #30 from rubiot/vararg_readme

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Adding a section explaining how to fake variadic functions
This commit is contained in:
Mike Long
2018-01-28 17:21:05 +00:00
committed by GitHub
parent 82eab51659 64ec1fc415
commit b359c2391b
2 changed files with 27 additions and 0 deletions
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17
README.md
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@@ -371,6 +371,23 @@ The fake will call your custom functions in the order specified by the SET_CUSTO
macro. When the last custom fake is reached the fake will keep calling the last custom
fake in the sequence. This macro works much like the SET_RETURN_SEQ macro.
## Variadic Functions
You can fake variadic functions using the macros <tt>FAKE_VALUE_FUNC_VARARG</tt>
and <tt>FAKE_VOID_FUNC_VARARG</tt>. For instance:
FAKE_VALUE_FUNC_VARARG(int, fprintf, FILE *, const char*, ...);
In order to access the variadic parameters from a custom fake function, declare a
<tt>va_list</tt> parameter. For instance, a custom fake for <tt>fprintf()</tt>
could call the real <tt>fprintf()</tt> like this:
int fprintf_custom(FILE *stream, const char *format, va_list ap) {
if (fprintf0_fake.return_val < 0) // should we fail?
return fprintf0_fake.return_val;
return vfprintf(stream, format, ap);
}
## How do I fake a function that returns a value by reference?
The basic mechanism that FFF provides you in this case is the custom_fake field described in the *Custom Return Value Delegate* example above.

10
test/test_cases.include
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@@ -299,6 +299,11 @@ TEST_F(FFFTestSuite, use_void_vararg_fake_with_different_number_of_arguments)
voidfunc3var("1 parameter", 1, 10);
voidfunc3var("2 parameters", 2, 10, 20);
voidfunc3var("3 parameters", 3, 10, 20, 30);
ASSERT_EQ(voidfunc3var_fake.call_count, 4);
char msg[] = "3 parameters";
ASSERT_EQ(strcmp(voidfunc3var_fake.arg0_val, msg), 0);
ASSERT_EQ(3, voidfunc3var_fake.arg1_val);
}
TEST_F(FFFTestSuite, use_value_vararg_fake_with_different_number_of_arguments)
@@ -307,6 +312,11 @@ TEST_F(FFFTestSuite, use_value_vararg_fake_with_different_number_of_arguments)
valuefunc3var("1 parameter", 1, 10);
valuefunc3var("2 parameters", 2, 10, 20);
valuefunc3var("3 parameters", 3, 10, 20, 30);
ASSERT_EQ(valuefunc3var_fake.call_count, 4);
char msg[] = "3 parameters";
ASSERT_EQ(strcmp(valuefunc3var_fake.arg0_val, msg), 0);
ASSERT_EQ(3, valuefunc3var_fake.arg1_val);
}
#endif /* __cplusplus */