tmpbuf.h File Reference

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Description

Round robin temporary buffers.

This helper provides some buffers per thread which are round-robin recycled with each use. The idea is to have fast buffers for temporal data without need for explicit heap management. There is a fixed number of buffers per thread, which will be re-used with a round-robin pattern, without any safety checks. The caller just needs to ensure not to use too much of these buffers. Typical usage is for "just printing a damn number", hand it over to a library, which will copy the data anyway.

Warning

this is the restored old version from bc989dab7a97fc69c (July 2010) (the improved version is still buggy as of 5/2011)

Definition in file tmpbuf.h.

#include <stdlib.h>

Macros
#define	LUMIERA_TMPBUF_NUM   16
	Number of buffers in the ring This also defines how many concurent buffers can be in use in one thread (including nested calls) tmpbufs are only suitable for nested calls where one knows in advance how much tmpbufs might be used. More...

Functions
void	lumiera_tmpbuf_freeall (void)
	free all buffers associated with this thread. More...
void *	lumiera_tmpbuf_provide (size_t size)
	Query a thread local tmpbuf. More...
char *	lumiera_tmpbuf_snprintf (size_t size, const char *fmt,...)
	Construct a string in a tmpbuf. More...
char *	lumiera_tmpbuf_strcat3 (const char *str1, size_t str1_len, const char *str2, size_t str2_len, const char *str3, size_t str3_len)
	Concat up to 3 strings in a tmpbuf. More...
char *	lumiera_tmpbuf_strndup (const char *src, size_t size)
	Duplicate string to a tmpbuf. More...
char *	lumiera_tmpbuf_tr (const char *in, const char *from, const char *to, const char *def)
	Translates characters in a string, similar to the shell 'tr' utility. More...

Macro Definition Documentation

LUMIERA_TMPBUF_NUM

#define LUMIERA_TMPBUF_NUM   16

Number of buffers in the ring This also defines how many concurent buffers can be in use in one thread (including nested calls) tmpbufs are only suitable for nested calls where one knows in advance how much tmpbufs might be used.

Warning

the value defined here must be a power of 2

Definition at line 52 of file tmpbuf.h.

Function Documentation

lumiera_tmpbuf_freeall()

void lumiera_tmpbuf_freeall

(

void

)

free all buffers associated with this thread.

This function is called automatically, usually one doesnt need to call it.

Definition at line 73 of file tmpbuf.c.

lumiera_tmpbuf_provide()

void* lumiera_tmpbuf_provide

(

size_t

size

)

Query a thread local tmpbuf.

Parameters

size	minimal needed size for the tmpbuf

Returns

the tmpbuf

Definition at line 89 of file tmpbuf.c.

Referenced by lumiera_tmpbuf_strndup().

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lumiera_tmpbuf_strndup()

char* lumiera_tmpbuf_strndup	(	const char *	src,
		size_t	size
	)

Duplicate string to a tmpbuf.

Parameters

src	string to be duplicated
size	maximal length to be copied

Returns

temporary buffer containing a copy of the string

Definition at line 111 of file tmpbuf.c.

References lumiera_tmpbuf_provide().

Referenced by lumiera_tmpbuf_tr(), and scan_word().

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lumiera_tmpbuf_snprintf()

char* lumiera_tmpbuf_snprintf	(	size_t	size,
		const char *	fmt,
			...
	)

Construct a string in a tmpbuf.

Parameters

size	maximal length for the string
fmt	printf like formatstring
...	parameters

Returns

temporary buffer containing the constructed of the string

Definition at line 125 of file tmpbuf.c.

Referenced by lumiera_config_lookup_insert_default(), lumiera_tmpbuf_print_time(), and lumiera_tmpbuf_strcat3().

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lumiera_tmpbuf_strcat3()

char* lumiera_tmpbuf_strcat3	(	const char *	str1,
		size_t	str1_len,
		const char *	str2,
		size_t	str2_len,
		const char *	str3,
		size_t	str3_len
	)

Concat up to 3 strings in a tmpbuf.

Parameters

str1	first string to concat or NULL
str1_len	how much of the first string shall be used
str2	second string to concat or NULL
str2_len	how much of the second string shall be used
str3	third string to concat or NULL
str3_len	how much of the third string shall be used

Returns

temporary buffer containing the constructed of the string

Definition at line 144 of file tmpbuf.c.

References lumiera_tmpbuf_snprintf().

Referenced by lumiera_config_lookup_insert().

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lumiera_tmpbuf_tr()

char* lumiera_tmpbuf_tr	(	const char *	in,
		const char *	from,
		const char *	to,
		const char *	def
	)

Translates characters in a string, similar to the shell 'tr' utility.

Parameters

in	input string to be translated
from	source character set
to	destination character set
def	default destination character when a character is not in the source set, when NULL then translation will abort on unknown characters and return NULL, when "" then unknown characters will be removed when set to a single character string, unknown characters will be replaced with this character

Returns

temporary buffer containing the constructed of the string

Definition at line 156 of file tmpbuf.c.

References lumiera_tmpbuf_strndup().

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