void method_getArgumentType (struct objc_method * method, unsigned int argumentNumber,
char *returnValue, size_t returnValueSize)
{
if (returnValue == NULL || returnValueSize == 0)
return;
/* Zero the string; we'll then write the argument type at the
beginning of it, if needed. */
memset (returnValue, 0, returnValueSize);
if (method == NULL)
return;
else
{
const char *returnValueStart;
size_t argumentTypeSize;
/* Determine returnValueStart and argumentTypeSize. */
{
const char *type = method->method_types;
/* Skip the first argument (return type). */
type = objc_skip_argspec (type);
/* Now keep skipping arguments until we get to
argumentNumber. */
while (argumentNumber > 0)
{
/* We are supposed to skip an argument, but the string is
finished. This means we were asked for a non-existing
argument. */
if (*type == '\0')
return;
type = objc_skip_argspec (type);
argumentNumber--;
}
/* If the argument does not exist, it's game over. */
if (*type == '\0')
return;
returnValueStart = type;
type = objc_skip_argspec (type);
argumentTypeSize = type - returnValueStart;
if (argumentTypeSize > returnValueSize)
argumentTypeSize = returnValueSize;
}
/* Copy the argument at the beginning of the string. */
memcpy (returnValue, returnValueStart, argumentTypeSize);
}
}
char *
method_copyArgumentType (struct objc_method * method, unsigned int argumentNumber)
{
if (method == NULL)
return 0;
else
{
char *returnValue;
const char *returnValueStart;
size_t returnValueSize;
/* Determine returnValueStart and returnValueSize. */
{
const char *type = method->method_types;
/* Skip the first argument (return type). */
type = objc_skip_argspec (type);
/* Now keep skipping arguments until we get to
argumentNumber. */
while (argumentNumber > 0)
{
/* We are supposed to skip an argument, but the string is
finished. This means we were asked for a non-existing
argument. */
if (*type == '\0')
return NULL;
type = objc_skip_argspec (type);
argumentNumber--;
}
/* If the argument does not exist, return NULL. */
if (*type == '\0')
return NULL;
returnValueStart = type;
type = objc_skip_argspec (type);
returnValueSize = type - returnValueStart + 1;
}
/* Copy the argument into returnValue. */
returnValue = malloc (sizeof (char) * returnValueSize);
memcpy (returnValue, returnValueStart, returnValueSize);
returnValue[returnValueSize - 1] = '\0';
return returnValue;
}
}
unsigned int
method_getNumberOfArguments (struct objc_method *method)
{
if (method == NULL)
return 0;
else
{
unsigned int i = 0;
const char *type = method->method_types;
while (*type)
{
type = objc_skip_argspec (type);
i += 1;
}
if (i == 0)
{
/* This could only happen if method_types is invalid; in
that case, return 0. */
return 0;
}
else
{
/* Remove the return type. */
return (i - 1);
}
}
}
void method_getReturnType (struct objc_method * method, char *returnValue,
size_t returnValueSize)
{
if (returnValue == NULL || returnValueSize == 0)
return;
/* Zero the string; we'll then write the argument type at the
beginning of it, if needed. */
memset (returnValue, 0, returnValueSize);
if (method == NULL)
return;
else
{
size_t argumentTypeSize;
/* Determine argumentTypeSize. */
{
/* Find the end of the first argument. We want to return the
first argument spec. */
const char *type = method->method_types;
if (*type == '\0')
return;
type = objc_skip_argspec (type);
argumentTypeSize = type - method->method_types;
if (argumentTypeSize > returnValueSize)
argumentTypeSize = returnValueSize;
}
/* Copy the argument at the beginning of the string. */
memcpy (returnValue, method->method_types, argumentTypeSize);
}
}
char *
method_copyReturnType (struct objc_method *method)
{
if (method == NULL)
return 0;
else
{
char *returnValue;
size_t returnValueSize;
/* Determine returnValueSize. */
{
/* Find the end of the first argument. We want to return the
first argument spec, plus 1 byte for the \0 at the end. */
const char *type = method->method_types;
if (*type == '\0')
return NULL;
type = objc_skip_argspec (type);
returnValueSize = type - method->method_types + 1;
}
/* Copy the first argument into returnValue. */
returnValue = malloc (sizeof (char) * returnValueSize);
memcpy (returnValue, method->method_types, returnValueSize);
returnValue[returnValueSize - 1] = '\0';
return returnValue;
}
}
char*
method_get_nth_argument (struct objc_method* m,
arglist_t argframe, int arg,
const char **type)
{
const char* t = objc_skip_argspec (m->method_types);
if (arg > method_get_number_of_arguments (m))
return 0;
while (arg--)
t = objc_skip_argspec (t);
*type = t;
t = objc_skip_typespec (t);
if (*t == '+')
return argframe->arg_regs + atoi (++t);
else
return argframe->arg_ptr + atoi (t);
}
/*
Return the number of arguments that the method MTH expects.
Note that all methods need two implicit arguments `self' and
`_cmd'.
*/
int
method_get_number_of_arguments (struct objc_method* mth)
{
int i = 0;
const char* type = mth->method_types;
while (*type)
{
type = objc_skip_argspec (type);
i += 1;
}
return i - 1;
}
char *
method_get_next_argument (arglist_t argframe, const char **type)
{
const char *t = objc_skip_argspec (*type);
if (*t == '\0')
return 0;
*type = t;
t = objc_skip_typespec (t);
if (*t == '+')
return argframe->arg_regs + atoi (++t);
else
return argframe->arg_ptr + atoi (t);
}
