477 lines
8.9 KiB
HTML
477 lines
8.9 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
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<HTML
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><HEAD
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><TITLE
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>strings</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
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REL="HOME"
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TITLE="libEtPan! API"
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HREF="book1.htm"><LINK
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REL="UP"
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TITLE="Tools and datatypes"
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HREF="c16.htm"><LINK
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><TH
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COLSPAN="3"
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ALIGN="center"
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>libEtPan! API</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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HREF="x289.htm"
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>Prev</A
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 2. Tools and datatypes</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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HREF="c385.htm"
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="AEN312"
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>strings</A
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></H1
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><PRE
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CLASS="PROGRAMLISTING"
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>
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#include <libetpan/libetpan.h>
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struct _MMAPString
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{
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char * str;
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size_t len;
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size_t allocated_len;
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int fd;
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size_t mmapped_size;
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};
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typedef struct _MMAPString MMAPString;
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</PRE
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><P
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> MMAPString is a string which size that can increase automatically.
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</P
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="MMAP-STRING-NEW"
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>constructor and destructor</A
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></H2
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><PRE
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CLASS="PROGRAMLISTING"
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>MMAPString * mmap_string_new(const char * init);
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MMAPString * mmap_string_new_len(const char * init, size_t len);
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MMAPString * mmap_string_sized_new(size_t dfl_size);
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void mmap_string_free(MMAPString * string);
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</PRE
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_new()</B
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> allocates a new
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string. init is the intial value of the string.
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<B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_new_len()</B
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> allocates a new
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string. init is the intial value of the
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string, len is the length of the initial string.
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<B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_sized_new()</B
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> allocates a new
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string. dfl_size is the initial allocation of
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the string. <B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_free()</B
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> release the memory used
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by the string.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="MMAP-STRING-ASSIGN"
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>string value modification</A
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></H2
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><PRE
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CLASS="PROGRAMLISTING"
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>MMAPString * mmap_string_assign(MMAPString * string, const char * rval);
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MMAPString * mmap_string_truncate(MMAPString *string, size_t len);
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</PRE
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_assign()</B
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> sets a new value for
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the given string.
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<B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_truncate()</B
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> sets a length for
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the string.
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<B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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</P
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><PRE
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CLASS="PROGRAMLISTING"
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>MMAPString * mmap_string_set_size (MMAPString * string, size_t len);
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</PRE
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><P
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> sets the allocation of the string.
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<B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="MMAP-STRING-APPEND"
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>insertion in string, deletion in string</A
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></H2
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><PRE
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CLASS="PROGRAMLISTING"
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>MMAPString * mmap_string_insert_len(MMAPString * string, size_t pos,
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const char * val, size_t len);
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MMAPString * mmap_string_append(MMAPString * string, const char * val);
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MMAPString * mmap_string_append_len(MMAPString * string,
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const char * val, size_t len);
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MMAPString * mmap_string_append_c(MMAPString * string, char c);
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MMAPString * mmap_string_prepend(MMAPString * string, const char * val);
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MMAPString * mmap_string_prepend_c(MMAPString * string, char c);
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MMAPString * mmap_string_prepend_len(MMAPString * string, const char * val,
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size_t len);
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MMAPString * mmap_string_insert(MMAPString * string, size_t pos,
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const char * val);
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MMAPString * mmap_string_insert_c(MMAPString *string, size_t pos,
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char c);
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MMAPString * mmap_string_erase(MMAPString * string, size_t pos,
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size_t len);
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</PRE
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><P
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> For complexity here, n is the size of the given MMAPString,
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and len is the size of the string to insert.
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_insert_len()</B
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> inserts the given
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string value of given length in the string at the given
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position. <B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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Complexity is O(n + len).
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_append()</B
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> appends the given
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string value at the end of the string.
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<B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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Complexity is O(len).
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_append_len()</B
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> appends the
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given string value of given length at the end of the
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string. <B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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Complexity is O(len).
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_append_c()</B
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> appends the given
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character at the end of the string.
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<B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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Complexity is O(1).
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_prepend()</B
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> insert the given
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string value at the beginning of the string.
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<B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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Complexity is O(n + len).
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_prepend_c()</B
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> insert the given
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character at the beginning of the string.
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<B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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Complexity is O(n).
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_prepend_len()</B
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> insert the given
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string value of given length at the beginning of the string.
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<B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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Complexity is O(n + len).
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_insert()</B
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> inserts the given
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string value in the string at the given position.
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NULL will be returned on error.
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Complexity is O(n + len).
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_insert_c()</B
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> inserts the given
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character in the string at the given position.
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NULL will be returned on error.
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Complexity is O(n).
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_erase()</B
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> removes the given
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count of characters (len) at the given position of the
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string. <B
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CLASS="COMMAND"
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>NULL</B
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> will be returned on error.
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Complexity is O(n).
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="MMAP-STRING-REF"
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>referencing string</A
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></H2
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><PRE
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CLASS="PROGRAMLISTING"
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>int mmap_string_ref(MMAPString * string);
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int mmap_string_unref(char * str);
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</PRE
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><P
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> MMAPString provides a mechanism that let you use MMAPString
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like normal strings. You have first to use
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<B
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CLASS="COMMAND"
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>mmap_string_ref()</B
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>, so that you notify
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that the string will be used as a normal string, then, you
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use <B
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CLASS="COMMAND"
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>mmapstr->str</B
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> to refer to the
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string. When you have finished and you want to free a string
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corresponding to a <B
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CLASS="COMMAND"
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>MMAPString</B
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>, you will
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use <B
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CLASS="COMMAND"
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>mmap_string_unref</B
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>.
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</P
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><P
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> <B
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CLASS="COMMAND"
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>mmap_string_ref()</B
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> references the string
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so that the array of characters can be used as a normal
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string then released with
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<B
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CLASS="COMMAND"
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||
|
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>mmap_string_unref()</B
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>.
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The array of characters will be obtained with string->str.
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returns -1 on error, 0 on success.
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||
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</P
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||
|
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></DIV
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||
|
|
></DIV
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||
|
|
><DIV
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||
|
|
CLASS="NAVFOOTER"
|
||
|
|
><HR
|
||
|
|
ALIGN="LEFT"
|
||
|
|
WIDTH="100%"><TABLE
|
||
|
|
SUMMARY="Footer navigation table"
|
||
|
|
WIDTH="100%"
|
||
|
|
BORDER="0"
|
||
|
|
CELLPADDING="0"
|
||
|
|
CELLSPACING="0"
|
||
|
|
><TR
|
||
|
|
><TD
|
||
|
|
WIDTH="33%"
|
||
|
|
ALIGN="left"
|
||
|
|
VALIGN="top"
|
||
|
|
><A
|
||
|
|
HREF="x289.htm"
|
||
|
|
ACCESSKEY="P"
|
||
|
|
>Prev</A
|
||
|
|
></TD
|
||
|
|
><TD
|
||
|
|
WIDTH="34%"
|
||
|
|
ALIGN="center"
|
||
|
|
VALIGN="top"
|
||
|
|
><A
|
||
|
|
HREF="book1.htm"
|
||
|
|
ACCESSKEY="H"
|
||
|
|
>Home</A
|
||
|
|
></TD
|
||
|
|
><TD
|
||
|
|
WIDTH="33%"
|
||
|
|
ALIGN="right"
|
||
|
|
VALIGN="top"
|
||
|
|
><A
|
||
|
|
HREF="c385.htm"
|
||
|
|
ACCESSKEY="N"
|
||
|
|
>Next</A
|
||
|
|
></TD
|
||
|
|
></TR
|
||
|
|
><TR
|
||
|
|
><TD
|
||
|
|
WIDTH="33%"
|
||
|
|
ALIGN="left"
|
||
|
|
VALIGN="top"
|
||
|
|
>non-buffered I/O</TD
|
||
|
|
><TD
|
||
|
|
WIDTH="34%"
|
||
|
|
ALIGN="center"
|
||
|
|
VALIGN="top"
|
||
|
|
><A
|
||
|
|
HREF="c16.htm"
|
||
|
|
ACCESSKEY="U"
|
||
|
|
>Up</A
|
||
|
|
></TD
|
||
|
|
><TD
|
||
|
|
WIDTH="33%"
|
||
|
|
ALIGN="right"
|
||
|
|
VALIGN="top"
|
||
|
|
>Internet Message Format</TD
|
||
|
|
></TR
|
||
|
|
></TABLE
|
||
|
|
></DIV
|
||
|
|
></BODY
|
||
|
|
></HTML
|
||
|
|
>
|