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<title>String Chunks: GLib Reference Manual</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Description
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String Chunks
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String Chunks — efficient storage of groups of strings
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Functions
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GStringChunk *
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g_string_chunk_new ()
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gchar *
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g_string_chunk_insert ()
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gchar *
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g_string_chunk_insert_const ()
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gchar *
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g_string_chunk_insert_len ()
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void
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g_string_chunk_clear ()
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void
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g_string_chunk_free ()
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Types and Values
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GStringChunk
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Includes
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#include <gmodule.h>
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Description
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String chunks are used to store groups of strings. Memory is
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allocated in blocks, and as strings are added to the GStringChunk
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they are copied into the next free position in a block. When a block
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is full a new block is allocated.
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When storing a large number of strings, string chunks are more
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efficient than using g_strdup() since fewer calls to malloc() are
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needed, and less memory is wasted in memory allocation overheads.
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By adding strings with g_string_chunk_insert_const() it is also
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possible to remove duplicates.
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To create a new GStringChunk use g_string_chunk_new().
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To add strings to a GStringChunk use g_string_chunk_insert().
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To add strings to a GStringChunk, but without duplicating strings
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which are already in the GStringChunk, use
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g_string_chunk_insert_const().
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To free the entire GStringChunk use g_string_chunk_free(). It is
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not possible to free individual strings.
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Functions
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g_string_chunk_new ()
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GStringChunk *
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g_string_chunk_new (gsize size);
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Creates a new GStringChunk.
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Parameters
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size
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the default size of the blocks of memory which are
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allocated to store the strings. If a particular string
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is larger than this default size, a larger block of
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memory will be allocated for it.
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Returns
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a new GStringChunk
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g_string_chunk_insert ()
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gchar *
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g_string_chunk_insert (GStringChunk *chunk,
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const gchar *string);
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Adds a copy of string
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to the GStringChunk.
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It returns a pointer to the new copy of the string
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in the GStringChunk. The characters in the string
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can be changed, if necessary, though you should not
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change anything after the end of the string.
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Unlike g_string_chunk_insert_const(), this function
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does not check for duplicates. Also strings added
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with g_string_chunk_insert() will not be searched
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by g_string_chunk_insert_const() when looking for
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duplicates.
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Parameters
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chunk
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a GStringChunk
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string
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the string to add
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Returns
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a pointer to the copy of string
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within
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the GStringChunk
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g_string_chunk_insert_const ()
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gchar *
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g_string_chunk_insert_const (GStringChunk *chunk,
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const gchar *string);
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Adds a copy of string
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to the GStringChunk, unless the same
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string has already been added to the GStringChunk with
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g_string_chunk_insert_const().
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This function is useful if you need to copy a large number
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of strings but do not want to waste space storing duplicates.
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But you must remember that there may be several pointers to
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the same string, and so any changes made to the strings
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should be done very carefully.
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Note that g_string_chunk_insert_const() will not return a
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pointer to a string added with g_string_chunk_insert(), even
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if they do match.
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Parameters
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chunk
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a GStringChunk
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string
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the string to add
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Returns
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a pointer to the new or existing copy of string
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within the GStringChunk
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g_string_chunk_insert_len ()
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gchar *
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g_string_chunk_insert_len (GStringChunk *chunk,
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const gchar *string,
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gssize len);
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Adds a copy of the first len
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bytes of string
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to the GStringChunk.
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The copy is nul-terminated.
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Since this function does not stop at nul bytes, it is the caller's
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responsibility to ensure that string
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has at least len
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addressable
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bytes.
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The characters in the returned string can be changed, if necessary,
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though you should not change anything after the end of the string.
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Parameters
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chunk
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a GStringChunk
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string
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bytes to insert
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len
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number of bytes of string
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to insert, or -1 to insert a
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nul-terminated string
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Returns
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a pointer to the copy of string
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within the GStringChunk
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Since: 2.4
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g_string_chunk_clear ()
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void
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g_string_chunk_clear (GStringChunk *chunk);
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Frees all strings contained within the GStringChunk.
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After calling g_string_chunk_clear() it is not safe to
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access any of the strings which were contained within it.
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Parameters
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chunk
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a GStringChunk
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Since: 2.14
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g_string_chunk_free ()
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void
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g_string_chunk_free (GStringChunk *chunk);
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Frees all memory allocated by the GStringChunk.
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After calling g_string_chunk_free() it is not safe to
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access any of the strings which were contained within it.
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Parameters
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chunk
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a GStringChunk
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Types and Values
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GStringChunk
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typedef struct _GStringChunk GStringChunk;
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An opaque data structure representing String Chunks.
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It should only be accessed by using the following functions.
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