diff options
| author | Matthias Andree <matthias.andree@gmx.de> | 2010-03-05 22:33:03 +0100 |
|---|---|---|
| committer | Matthias Andree <matthias.andree@gmx.de> | 2010-03-05 22:33:03 +0100 |
| commit | c116e68a05e2feb9a0c8e735aab097ef5ea1dfb3 (patch) | |
| tree | d85dbf0c490ac94e33a1f7100ce7c62a2cce2011 /trio/html/group___user_defined.html | |
| parent | bf62e6236f6c82871e493b65d56c1fe7680f74ad (diff) | |
| download | fetchmail-c116e68a05e2feb9a0c8e735aab097ef5ea1dfb3.tar.gz fetchmail-c116e68a05e2feb9a0c8e735aab097ef5ea1dfb3.tar.bz2 fetchmail-c116e68a05e2feb9a0c8e735aab097ef5ea1dfb3.zip | |
Drop outdated documentation. Can be regenerated with Doxygen.
Diffstat (limited to 'trio/html/group___user_defined.html')
| -rw-r--r-- | trio/html/group___user_defined.html | 379 |
1 files changed, 0 insertions, 379 deletions
diff --git a/trio/html/group___user_defined.html b/trio/html/group___user_defined.html deleted file mode 100644 index b2507275..00000000 --- a/trio/html/group___user_defined.html +++ /dev/null @@ -1,379 +0,0 @@ -<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> -<html> -<head> - <meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> - <title>TRIO</title> - <link href="trio.css" rel="stylesheet" type="text/css"> -</head> -<body> -<!-- Generated by Doxygen 1.2.12 --> -<center> -<a class="qindex" href="index.html">Main Page</a> <a class="qindex" href="modules.html">Modules</a> </center> -<hr><h1>User-defined Formatted Printing Functions.</h1>Functions for using customized formatting specifiers. -<a href="#_details">More...</a><table border=0 cellpadding=0 cellspacing=0> -<tr><td colspan=2><br><h2>Functions</h2></td></tr> -<tr><td nowrap align=right valign=top>trio_pointer_t </td><td valign=bottom><a class="el" href="group___user_defined.html#a0">trio_register</a> (trio_callback_t callback, const char *name)</td></tr> -<tr><td> </td><td><font size=-1><em>Register new user-defined specifier.</em> <a href="#a0">More...</a><em></em></font><br><br></td></tr> -<tr><td nowrap align=right valign=top>void </td><td valign=bottom><a class="el" href="group___user_defined.html#a1">trio_unregister</a> (trio_pointer_t handle)</td></tr> -<tr><td> </td><td><font size=-1><em>Unregister an existing user-defined specifier.</em> <a href="#a1">More...</a><em></em></font><br><br></td></tr> -</table> -<hr><a name="_details"></a><h2>Detailed Description</h2> -Functions for using customized formatting specifiers. -<p> -<b>SYNOPSIS</b> -<p> -<div class="fragment"><pre> -cc ... -ltrio -lm - -#include <trio.h> -#include <triop.h> -</pre></div> -<p> -<b>DESCRIPTION</b> -<p> -This documentation is incomplete. -<p> -<b>User-defined</b> <b>Specifier</b> -<p> -The user-defined specifier consists of a start character (\074 = '<'), an optional namespace string followed by a namespace separator (\072 = ':'), a format string, and an end character (\076 = '>'). -<p> -The namespace string can consist of alphanumeric characters, and is used to define a named reference (see below). The namespace is case-sensitive. If no namespace is specified, then we use an unnamed reference (see below). -<p> -The format can consist of any character except the end character ('>'), the namespace separator (':'), and the nil character (\000). -<p> -Any modifier can be used together with the user-defined specifier. -<p> -<b>Registering</b> -<p> -A user-defined specifier must be registered before it can be used. Unregistered user-defined specifiers are ignored. The <a class="el" href="group___user_defined.html#a0">trio_register</a> function is used to register a user-defined specifier. It takes two argument, a callback function and a namespace, and it returns a handle. The handle must be used to unregister the specifier later. -<p> -The following example registers a user-define specifier with the "my_namespace" namespace: -<p> -<div class="fragment"><pre> - my_handle = trio_register(my_callback, "my_namespace"); -</pre></div> -<p> -There can only be one user-defined specifier with a given namespace. There can be an unlimited number (subject to maximum length of the namespace) of different user-defined specifiers. -<p> -Passing NULL as the namespace argument results in an anonymous reference. There can be an unlimited number of anonymous references. -<p> -<b>REFERENCES</b> -<p> -There are two ways that a registered callback can be called. Either the user-defined specifier must contain the registered namespace in the format string, or the handle is passed as an argument to the formatted printing function. -<p> -If the namespace is used, then a user-defined pointer must be passed as an argument: -<p> -<div class="fragment"><pre> - trio_printf("<my_namespace:format>\n", my_data); -</pre></div> -<p> -If the handle is used, then the user-defined specifier must not contain a namespace. Instead the handle must be passed as an argument, followed by a user-defined pointer: -<p> -<div class="fragment"><pre> - trio_printf("<format>\n", my_handle, my_data); -</pre></div> -<p> -The two examples above are equivalent. -<p> -There must be exactly one user-defined pointer per user-defined specifier. This pointer can be used within the callback function with the trio_get_argument getter function (see below). -<p> -The format string is optional. It can be used within the callback function with the trio_get_format getter function. -<p> -<b>Anonymous</b> <b>References</b> Anonymous references are specified by passing NULL as the namespace. -<p> -The handle must be passed as an argument followed by a user-defined pointer. No namespace can be specified. -<p> -<div class="fragment"><pre> - anon_handle = trio_register(callback, NULL); - trio_printf("<format>\n", anon_handle, my_data); -</pre></div> -<p> -<b>Restrictions</b> -<p> -<ul> -<li> The length of the namespace string cannot exceed 63 characters. <li> The length of the user-defined format string cannot exceed 255 characters. <li> User-defined formatting cannot re-define existing specifiers. This restriction was imposed because the existing formatting specifiers have a well-defined behaviour, and any re-definition would apply globally to an application (imagine a third-party library changing the behaviour of a specifier that is crusial to your application).</ul> -<b>CALLBACK</b> <b>FUNCTION</b> -<p> -The callback function will be called if a matching user-defined specifier is found within the formatting string. The callback function takes one input parameter, an opaque reference which is needed by the private functions. It returns an <code>int</code>, which is currently ignored. The prototype is -<p> -<div class="fragment"><pre> - int (*trio_callback_t)(void *ref); -</pre></div> -<p> -See the Example section for full examples. -<p> -<b>PRINTING</b> <b>FUNCTIONS</b> -<p> -The following printing functions must only be used inside a callback function. These functions will print to the same output medium as the printf function which invoked the callback function. For example, if the user-defined specifier is used in an sprintf function, then these print functions will output their result to the same string. -<p> -<b>Elementary</b> <b>Printing</b> -<p> -There are a number of function to print elementary data types. -<p> -<ul> -<li> trio_print_int Print a signed integer. For example: <div class="fragment"><pre> - trio_print_int(42); -</pre></div> <li> trio_print_uint Print an unsigned integer. <li> trio_print_double Print a floating-point number. <li> trio_print_string Print a string. For example: <div class="fragment"><pre> - trio_print_string("Hello World"); - trio_print_string(trio_get_format()); -</pre></div> <li> trio_print_pointer Print a pointer.</ul> -<b>Formatted</b> <b>Printing</b> -<p> -The functions trio_print_ref, trio_vprint_ref, and trio_printv_ref outputs a formatted string just like its printf equivalents. -<p> -<div class="fragment"><pre> - trio_print_ref(ref, "There are %d towels\n", 42); - trio_print_ref(ref, "%<recursive>\n", recursive_writer, trio_get_argument()); -</pre></div> -<p> -<b>GETTER</b> <b>AND</b> <b>SETTER</b> <b>FUNCTIONS</b> -<p> -The following getter and setter functions must only be used inside a callback function. They can either operate on the modifiers or on special data. -<p> -<b>Modifiers</b> -<p> -The value of a modifier, or a boolean indication of its presence or absence, can be found or set with the getter and setter functions. The generic prototypes of the these getter and setter functions are -<p> -<div class="fragment"><pre> - int trio_get_???(void *ref); - void trio_set_???(void *ref, int); -</pre></div> -<p> -where ??? <code>refers</code> to a modifier. For example, to get the width of the user-defined specifier use -<p> -<div class="fragment"><pre> - int width = trio_get_width(ref); -</pre></div> -<p> -<b>Special</b> <b>Data</b> -<p> -Consider the following user-defined specifier, in its two possible referencing presentations. -<p> -<div class="fragment"><pre> - trio_printf("%<format>\n", namespace_writer, argument); - trio_printf("%<namespace:format>\n", argument); -</pre></div> -<p> -trio_get_format will get the <code>format</code> string, and trio_get_argument} will get the <code>argument</code> parameter. There are no associated setter functions. -<p> -<b>EXAMPLES</b> -<p> -The following examples show various types of user-defined specifiers. Although each specifier is demonstrated in isolation, they can all co-exist within the same application. -<p> -<b>Time</b> <b>Example</b> -<p> -Print the time in the format "HOUR:MINUTE:SECOND" if "time" is specified inside the user-defined specifier. -<p> -<div class="fragment"><pre> - static int time_writer(void *ref) - { - const char *format; - time_t *data; - char buffer[256]; - - format = trio_get_format(ref); - if ((format) && (strcmp(format, "time") == 0)) { - data = trio_get_argument(ref); - if (data == NULL) - return -1; - strftime(buffer, sizeof(buffer), "%H:%M:%S", localtime(data)); - trio_print_string(ref, buffer); - } - return 0; - } -</pre></div> -<p> -<div class="fragment"><pre> - int main(void) - { - void *handle; - time_t now = time(NULL); - - handle = trio_register(time_print, "my_time"); - - trio_printf("%<time>\n", handle, &now); - trio_printf("%<my_time:time>\n", &now); - - trio_unregister(handle); - return 0; - } -</pre></div> -<p> -<b>Complex</b> <b>Numbers</b> <b>Example</b> -<p> -Consider a complex number consisting of a real part, re, and an imaginary part, im. -<p> -<div class="fragment"><pre> - struct Complex { - double re; - double im; - }; -</pre></div> -<p> -This example can print such a complex number in one of two formats. The default format is "re + i im". If the alternative modifier is used, then the format is "r exp(i theta)", where r is the length of the complex vector (re, im) and theta is its angle. -<p> -<div class="fragment"><pre> - static int complex_print(void *ref) - { - struct Complex *data; - const char *format; - - data = (struct Complex *)trio_get_argument(ref); - if (data) { - format = trio_get_format(ref); - - if (trio_get_alternative(ref)) { - double r, theta; - - r = sqrt(pow(data->re, 2) + pow(data->im, 2)); - theta = acos(data->re / r); - trio_print_ref(ref, "%#f exp(i %#f)", r, theta); - - } else { - trio_print_ref(ref, "%#f + i %#f", data->re, data->im); - } - } - return 0; - } -</pre></div> -<p> -<div class="fragment"><pre> - int main(void) - { - void *handle; - - handle = trio_register(complex_print, "complex"); - - /* Normal format. With handle and the with namespace */ - trio_printf("%<>\n", handle, &complex); - trio_printf("%<complex:>\n", &complex); - /* In exponential notation */ - trio_printf("%#<>\n", handle, &complex); - trio_printf("%#<complex:unused data>\n", &complex); - - trio_unregister(handle); - return 0; - } -</pre></div> -<p> -<b>RETURN</b> <b>VALUES</b> -<p> -<a class="el" href="group___user_defined.html#a0">trio_register</a> returns a handle, or NULL if an error occured. -<p> -<b>SEE</b> <b>ALSO</b> -<p> -<a class="el" href="group___printf.html#a0">trio_printf</a> -<p> -<b>NOTES</b> -<p> -User-defined specifiers, <a class="el" href="group___user_defined.html#a0">trio_register</a>, and <a class="el" href="group___user_defined.html#a1">trio_unregister</a> are not thread-safe. In multi-threaded applications they must be guarded by mutexes. Trio provides two special callback functions, called ":enter" and ":leave", which are invoked every time a thread-unsafe operation is attempted. As the thread model is determined by the application, these callback functions must be implemented by the application. -<p> -The following callback functions are for demonstration-purposes only. Replace their bodies with locking and unlocking of a mutex to achieve thread-safety. <div class="fragment"><pre> - static int enter_region(void *ref) - { - fprintf(stderr, "Enter Region\n"); - return 1; - } - - static int leave_region(void *ref) - { - fprintf(stderr, "Leave Region\n"); - return 1; - } -</pre></div> These two callbacks must be registered before other callbacks are registered. <div class="fragment"><pre> - trio_register(enter_region, ":enter"); - trio_register(leave_region, ":leave"); - - another_handle = trio_register(another_callback, NULL); -</pre></div> <hr><h2>Function Documentation</h2> -<a name="a0" doxytag="trio.c::trio_register"></a><p> -<table width="100%" cellpadding="2" cellspacing="0" border="0"> - <tr> - <td class="md"> - <table cellpadding="0" cellspacing="0" border="0"> - <tr> - <td class="md" nowrap valign="top"> trio_pointer_t trio_register </td> - <td class="md" valign="top">( </td> - <td class="md" nowrap valign="top">trio_callback_t </td> - <td class="mdname" nowrap> <em>callback</em>, </td> - </tr> - <tr> - <td></td> - <td></td> - <td class="md" nowrap>const char * </td> - <td class="mdname" nowrap> <em>name</em></td> - </tr> - <tr> - <td></td> - <td class="md">) </td> - <td class="md" colspan="2"></td> - </tr> - - </table> - </td> - </tr> -</table> -<table cellspacing=5 cellpadding=0 border=0> - <tr> - <td> - - </td> - <td> - -<p> -Register new user-defined specifier. -<p> -<dl compact><dt><b> -Parameters: </b><dd> -<table border=0 cellspacing=2 cellpadding=0> -<tr><td valign=top><em>callback</em> </td><td> -</td></tr> -<tr><td valign=top><em>name</em> </td><td> -</td></tr> -</table> -</dl><dl compact><dt><b> -Returns: </b><dd> -Handle. </dl> </td> - </tr> -</table> -<a name="a1" doxytag="trio.c::trio_unregister"></a><p> -<table width="100%" cellpadding="2" cellspacing="0" border="0"> - <tr> - <td class="md"> - <table cellpadding="0" cellspacing="0" border="0"> - <tr> - <td class="md" nowrap valign="top"> void trio_unregister </td> - <td class="md" valign="top">( </td> - <td class="md" nowrap valign="top">trio_pointer_t </td> - <td class="mdname1" valign="top" nowrap> <em>handle</em> </td> - <td class="md" valign="top">) </td> - <td class="md" nowrap></td> - </tr> - - </table> - </td> - </tr> -</table> -<table cellspacing=5 cellpadding=0 border=0> - <tr> - <td> - - </td> - <td> - -<p> -Unregister an existing user-defined specifier. -<p> -<dl compact><dt><b> -Parameters: </b><dd> -<table border=0 cellspacing=2 cellpadding=0> -<tr><td valign=top><em>handle</em> </td><td> -</td></tr> -</table> -</dl> </td> - </tr> -</table> -<HR> -<center class="copyright">Copyright (C) 2001 Bjørn Reese and Daniel Stenberg.</center> -</body> -</html> |