roc::core::StringBuilder Class Reference

String builder. More...

#include <string_builder.h>

Inheritance diagram for roc::core::StringBuilder:

Collaboration diagram for roc::core::StringBuilder:

Public Member Functions
	StringBuilder (char *buf, size_t bufsz)
	Construct string builder on top of fixed-size buffer. More...
	StringBuilder (StringBuffer &buf)
	Construct string builder on top of dynamic buffer. More...
size_t	needed_size () const
	Get number of bytes required to store the output string. Includes terminating zero byte. More...
size_t	actual_size () const
	Get number of bytes actually written to the output string. Includes terminating zero byte. More...
bool	is_ok () const
	Check for errors. More...
bool	assign_str (const char *str)
	Overwrite result with given string. If there is not enough space, truncates the string and returns false. More...
bool	assign_str (const char *str_begin, const char *str_end)
	Overwrite result with given range. If there is not enough space, truncates the string and returns false. More...
bool	append_str (const char *str)
	Append to result given string. If there is not enough space, truncates the string and returns false. More...
bool	append_str (const char *str_begin, const char *str_end)
	Append to result given range. If there is not enough space, truncates the string and returns false. More...
bool	append_char (char ch)
	Append to result given character. If there is not enough space, truncates the string and returns false. More...
bool	append_uint (uint64_t number, unsigned int base)
	Format and append to result given number. If there is not enough space, truncates the string and returns false. More...

Detailed Description

String builder.

Allows to incrementally build a string. Doesn't own the string itself, but insetead holds a reference to external fixed-size or dynamic buffer. Supports "dry run" mode when no actual writing happens. This can be used to calculate the required buffer size before writing.

When used with fixed-sized buffer, all methods are signal-safe and hence can be used from a signal handler.

Definition at line 34 of file string_builder.h.

Constructor & Destructor Documentation

StringBuilder() [1/2]

roc::core::StringBuilder::StringBuilder	(	char *	buf,
		size_t	bufsz
	)

Construct string builder on top of fixed-size buffer.

The builder will write output string into the given buffer. If the output buffer is too small, the output string is truncated and error flag is set. If the output buffer has at least one byte, it will be always zero-terminated, even if truncation occurred.

buf may be NULL. In this case, nothing will be written, but needed_size() will be still calculated.

If buf is non-NULL, bufsz should be non-zero so that buffer could hold at least zero terminator. Otherwise, error flag is raised immediately in constructor.

If buf is NULL, bufsz may be both zero and non-zero. Use non-zero to get an error when buffer size is exceeded (like if it was a real buffer); use zero to disable buffer size checking (there is no buffer anyway).

StringBuilder() [2/2]

roc::core::StringBuilder::StringBuilder

(

StringBuffer &

buf

)

Construct string builder on top of dynamic buffer.

The builder will write output string into the given buffer. The buffer will be resized accordingly to the output string size plus terminating zero byte. The buffer will be always zero-terminated.

Member Function Documentation

actual_size()

size_t roc::core::StringBuilder::actual_size

(

)

const

Get number of bytes actually written to the output string. Includes terminating zero byte.

append_char()

bool roc::core::StringBuilder::append_char

(

char

ch

)

Append to result given character. If there is not enough space, truncates the string and returns false.

append_str() [1/2]

bool roc::core::StringBuilder::append_str

(

const char *

str

)

Append to result given string. If there is not enough space, truncates the string and returns false.

append_str() [2/2]

bool roc::core::StringBuilder::append_str	(	const char *	str_begin,
		const char *	str_end
	)

Append to result given range. If there is not enough space, truncates the string and returns false.

append_uint()

bool roc::core::StringBuilder::append_uint	(	uint64_t	number,
		unsigned int	base
	)

Format and append to result given number. If there is not enough space, truncates the string and returns false.

assign_str() [1/2]

bool roc::core::StringBuilder::assign_str

(

const char *

str

)

Overwrite result with given string. If there is not enough space, truncates the string and returns false.

assign_str() [2/2]

bool roc::core::StringBuilder::assign_str	(	const char *	str_begin,
		const char *	str_end
	)

Overwrite result with given range. If there is not enough space, truncates the string and returns false.

is_ok()

bool roc::core::StringBuilder::is_ok

(

)

const

Check for errors.

Remarks

Error flag is raised if any of the methods fail, and is cleared if an assign* method succeeds.

needed_size()

size_t roc::core::StringBuilder::needed_size

(

)

const

Get number of bytes required to store the output string. Includes terminating zero byte.

Remarks

If there is non-NULL output buffer, and no error occurred, this size is equal to actual_size(). Otherwise it may be larger.

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The documentation for this class was generated from the following file:

• roc_core/string_builder.h