/usr/include/wreport/var.h is in libwreport-dev 3.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#define WREPORT_VAR_H
#include <wreport/error.h>
#include <wreport/varinfo.h>
#include <cstdio>
#include <string>
#include <memory>
struct lua_State;
namespace wreport {
/**
* A physical variable
*
* A wreport::Var contains:
* \li a wreport::Varinfo describing the variable
* \li a value, that can be integer, floating point, string or opaque binary
* data as specified by the Varinfo
* \li zero or more attributes, represented by other wreport::Var objects
*/
class Var
{
protected:
/// Metadata about the variable
Varinfo m_info;
/// True if the variable is set, false otherwise
bool m_isset;
/**
* Value of the variable
*
* For numeric values, it is the value encoded to an integer decimal string
* according to m_info.
*
* For string values, it is the 0-terminated string.
*
* For binary values, it is a raw buffer where the first m_info->bit_len
* bits are the binary value, and the rest is set to 0.
*/
union {
int32_t i;
char* c;
} m_value;
/// Attribute list (ordered by Varcode)
Var* m_attrs;
/// Make sure that m_value is allocated. It does nothing if it already is.
void allocate();
/// Copy the value from var. var is assumed to have the same varinfo as us.
void copy_value(const Var& var);
/// Move the value from var. var is assumed to have the same varinfo as us. var is left unset.
void move_value(Var& var);
void assign_i_checked(int32_t val);
void assign_d_checked(double val);
void assign_b_checked(uint8_t* val, unsigned size);
void assign_c_checked(const char* val, unsigned size);
public:
/// Create a new Var, with undefined value
Var(Varinfo info);
/// Create a new Var, with integer value
Var(Varinfo info, int val);
/// Create a new Var, with double value
Var(Varinfo info, double val);
/// Create a new Var, with character value
Var(Varinfo info, const char* val);
/// Create a new Var, with character value
Var(Varinfo info, const std::string& val);
/**
* Create a new Var with the value from another one.
*
* Conversions are applied if necessary, attributes are not copied.
*
* @param info
* The wreport::Varinfo describing the variable to create
* @param var
* The variable with the value to use
*/
Var(Varinfo info, const Var& var);
/// Copy constructor
Var(const Var& var);
/**
* Move constructor.
*
* After movement, \a var will still a valid variable, but it will be unset
* and without attributes.
*/
Var(Var&& var);
~Var();
/// Assignment
Var& operator=(const Var& var);
/**
* Move assignment
*
* After movement, \a var will still a valid variable, but it will be unset
* and without attributes.
*/
Var& operator=(Var&& var);
bool operator==(const Var& var) const;
bool operator!=(const Var& var) const { return !operator==(var); }
/**
* Test if the values are the same, regardless of variable codes or
* attributes
*/
bool value_equals(const Var& var) const;
/// Retrieve the Varcode for a variable
Varcode code() const throw () { return m_info->code; }
/// Get informations about the variable
Varinfo info() const throw () { return m_info; }
/// @returns true if the variable is defined, else false
bool isset() const throw () { return m_isset; }
/// Get the value as an integer
int enqi() const;
/// Get the value as a double
double enqd() const;
/// Get the value as a string
const char* enqc() const;
/// Get the value as a std::string
std::string enqs() const;
/// Templated version of enq
template<typename T>
T enq() const
{
throw error_unimplemented("getting value of unsupported type");
}
/**
* Return the variable value, or the given default value if the variable is
* not set
*/
template<typename T>
T enq(T default_value) const
{
if (!isset()) return default_value;
return enq<T>();
}
/// Set the value from an integer value
void seti(int val);
/// Set the value from a double value
void setd(double val);
/// Set the value from a string or opaque binary value
void setc(const char* val);
/// Set the value from a string or opaque binary value
void sets(const std::string& val);
/// Set from a value formatted with the format() method
void setf(const char* val);
/**
* Set the value from a string value, truncating it if it is too long.
*
* If a value is truncated, the last character is set to '>' to mark the
* truncation.
*/
void setc_truncate(const char* val);
/**
* Set the value from another variable, performing conversions if
* needed. The attributes of \a src will be ignored.
*/
void setval(const Var& src);
/**
* Replace all attributes in this variable with all the attributes from \a
* src
*/
void setattrs(const Var& src);
/**
* Shortcuts (use with care, as the semanthics are slightly different
* depending on the type)
* @{
*/
void set(int val) { seti(val); }
void set(double val) { setd(val); }
void set(const char* val) { setc(val); }
void set(const std::string& val) { setc(val.c_str()); }
void set(const Var& var) { setval(var); setattrs(var); }
/// @}
/// Unset the value
void unset();
/// Remove all attributes
void clear_attrs();
/**
* Query variable attributes
*
* @param code
* The wreport::Varcode of the attribute requested. See @ref vartable.h
* @returns attr
* A pointer to the attribute if it exists, else NULL. The pointer points to
* the internal representation and must not be deallocated by the caller.
*/
const Var* enqa(Varcode code) const;
/**
* Set an attribute of the variable. An existing attribute with the same
* wreport::Varcode will be replaced.
*
* @param attr
* The attribute to add. It will be copied inside var, and memory management
* will still be in charge of the caller.
*/
void seta(const Var& attr);
/**
* Set an attribute of the variable. An existing attribute with the same
* wreport::Varcode will be replaced.
*
* @param attr
* The attribute to add. Its value will be moved inside the destination
* attribute, and attr will be unset.
*/
void seta(Var&& attr);
/**
* Set an attribute of the variable. An existing attribute with the same
* wreport::Varcode will be replaced.
*
* @param attr
* The attribute to add. It will be used directly, and var will take care of
* its memory management.
*/
void seta(std::unique_ptr<Var>&& attr);
/// Remove the attribute with the given code
void unseta(Varcode code);
/**
* Get the next attribute in the attribute list
*
* Example attribute iteration:
*
* for (const Var* a = var.next_attr(); a != NULL; a = a->next_attr())
* // Do something with a
*/
const Var* next_attr() const;
/**
* Create a formatted string representation of the variable value
*
* @param ifundef
* String to use if the variable is undefiend
*/
std::string format(const char* ifundef="") const;
/// Write the formatted value of this variable to an output stream
void format(FILE* out, const char* ifundef="") const;
/**
* Print the variable to an output stream
*
* @param out
* The output stream to use for printing
*/
void print(FILE* out) const;
/**
* Print the variable to an output stream
*
* @param out
* The output stream to use for printing
*/
void print(std::ostream& out) const;
/**
* Print the variable to an output stream, without its attributes
*
* @param out
* The output stream to use for printing
*/
void print_without_attrs(FILE* out, const char* end="\n") const;
/**
* Print the variable to an output stream, without its attributes
*
* @param out
* The output stream to use for printing
*/
void print_without_attrs(std::ostream& out) const;
/**
* Compare two Var and return the number of differences.
*
* Details of the differences found will be formatted using the notes
* system (@see notes.h).
*
* @param var
* The variable to compare with this one
* @returns
* The number of differences found and reported
*/
unsigned diff(const Var& var) const;
/**
* Push the variable as an object in the lua stack
*/
void lua_push(struct lua_State* L);
/**
* Check that the element at \a idx is a Var
*
* @return the Var element, or NULL if the check failed
*/
static Var* lua_check(struct lua_State* L, int idx);
};
template<> inline int Var::enq() const { return enqi(); }
template<> inline float Var::enq() const { return (float)enqd(); }
template<> inline double Var::enq() const { return enqd(); }
template<> inline const char* Var::enq() const { return enqc(); }
template<> inline std::string Var::enq() const { return enqs(); }
}
#endif
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