libcgi_cgi.3

c语言cgi库,可以实现用C语言实现CGI脚本

.TH "CGI manipulation" 3 "13 Mar 2003" "LibCGI" \" -*- nroff -*-
.ad l
.nh
.SH NAME
CGI manipulation \- 
.PP
.SS "Functions"

.in +1c
.ti -1c
.RI "formvars * \fBcgi_process_form\fP ()"
.br
.RI "\fIProcess HTML form or URL data.\fP"
.ti -1c
.RI "void \fBcgi_fatal\fP (const char *msg)"
.br
.RI "\fIKills the application with a message.\fP"
.ti -1c
.RI "int \fBcgi_include\fP (const char *filename)"
.br
.RI "\fIInclude static files.\fP"
.ti -1c
.RI "void \fBcgi_init_headers\fP ()"
.br
.RI "\fIInitialize HTML headers.\fP"
.ti -1c
.RI "char * \fBcgi_param_multiple\fP (const char *name)"
.br
.RI "\fIReturn all values with the same name sent by a form.\fP"
.ti -1c
.RI "void \fBcgi_redirect\fP (char *url)"
.br
.RI "\fIRecirects to the specified url.\fP"
.ti -1c
.RI "int \fBcgi_init\fP ()"
.br
.RI "\fIMain cgi function.\fP"
.ti -1c
.RI "void \fBcgi_end\fP ()"
.br
.RI "\fIPerforms cgi clean ups.\fP"
.ti -1c
.RI "char * \fBcgi_unescape_special_chars\fP (char *str)"
.br
.RI "\fITransforms' URL special chars.\fP"
.ti -1c
.RI "char * \fBcgi_escape_special_chars\fP (char *str)"
.br
.RI "\fITransforms' special characters into hexadecimal form ( %E1 ).\fP"
.ti -1c
.RI "char * \fBcgi_param\fP (const char *var_name)"
.br
.RI "\fIGets the of HTML or URL variable indicated by 'name'.\fP"
.ti -1c
.RI "void \fBcgi_send_header\fP (const char *header)"
.br
.RI "\fISends a specific header.\fP"
.in -1c
.SH "Function Documentation"
.PP 
.SS "void cgi_end ()"
.PP
Performs cgi clean ups.Provides some methods to clean memory or any other job that need to be done before the end of the application. 
.PP
\fBSee also:\fP
.RS 4
\fBcgi_init\fP 
.RE
.PP

.SS "char* cgi_escape_special_chars (char * str)"
.PP
Transforms' special characters into hexadecimal form ( %E1 ).\fBParameters:\fP
.RS 4
\fIstr\fP String to parse 
.RE
.PP
\fBReturns:\fP
.RS 4
The new string 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBcgi_unescape_special_chars\fP 
.RE
.PP

.SS "void cgi_fatal (const char * msg)"
.PP
Kills the application with a message.Writes msg and terminate 
.PP
\fBParameters:\fP
.RS 4
\fImsg\fP Message to send to the browser before killing 
.RE
.PP

.SS "int cgi_include (const char * filename)"
.PP
Include static files.Function used to include static data ( normaly html files ). File contents will never be processed. Note that I don't scan for any special character. The reason I did it is, if the you are using this library, you have a shell where you can compile the cgi program. And can do much more ;-) 
.PP
\fBParameters:\fP
.RS 4
\fIfilename\fP Filename with full path to include 
.RE
.PP
\fBReturns:\fP
.RS 4
If an error occurs and libcgi_debug is true, then a warning message is showed. 
.RE
.PP
\fBSee also:\fP
.RS 4
libcgi_debug
.RE
.PP
.PP
.nf

 cgi_include('top_bar.htm');
 
.PP

.SS "int cgi_init ()"
.PP
Main cgi function.Configures all (most?) we need to get cgi library working correctly. It MUST be called before any other cgi function. 
.PP
\fBSee also:\fP
.RS 4
\fBcgi_end\fP, \fBcgi_process_form\fP, \fBcgi_init_headers\fP 
.RE
.PP

.SS "void cgi_init_headers ()"
.PP
Initialize HTML headers.You need to call this function before that any content is send to the brosert, otherwise you'll get an error (Error 500). 
.PP
\fBSee also:\fP
.RS 4
\fBcgi_init\fP 
.RE
.PP

.SS "char* cgi_param (const char * var_name)"
.PP
Gets the of HTML or URL variable indicated by 'name'.\fBParameters:\fP
.RS 4
\fIname\fP Form Variable name 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBcgi_param_multiple\fP, \fBcgi_process_form\fP, \fBcgi_init\fP
.RE
.PP
.PP
.nf

 // ...
 char *contents;
 
 cgi_init();
 cgi_process_form();
 cgi_init_headers();
 
 contents = cgi_param('foo');
 
 puts(contents);
 
 // ...
 
.PP

.SS "char* cgi_param_multiple (const char * name)"
.PP
Return all values with the same name sent by a form.\fBParameters:\fP
.RS 4
\fIname\fP Form variable name 
.RE
.PP
\fBReturns:\fP
.RS 4
Form variable contents 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBcgi_param\fP
.RE
.PP
Example: For example, if in your HTML you have something like
.br
 
.br
 
.PP
.nf

 'What do you like??'
.br

  Computers : <input type='checkbox' name='like' value='computers'><br>
  Internet : <input type='checkbox' name='like' value='net'><br>
  games : <input type='checkbox' name='like' 'value='games''><br>
 
.PP
 
.br
 then, to retrieve all values, you can make a code like
.br

.br
.PP
.PP
.nf

 // ...
 char *data;
 \\ ...
 while ((data = cgi_param_multiple('like')) != NULL)
        puts(data);
 \\ ...
 
.PP

.SS "formvars* cgi_process_form ()"
.PP
Process HTML form or URL data.Used to retrieve GET or POST data. It handles automaticaly the correct REQUEST_METHOD, so you don't need to afraid about it. 
.PP
\fBReturns:\fP
.RS 4
Returns the contents of URL or FORM into a formvars variable, or NULL if FALSE. Most of time, you don't need any variable to store the form data, because is used an internal variable to manipulate the contents. 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBcgi_init\fP, \fBcgi_init_headers\fP 
.RE
.PP

.SS "void cgi_redirect (char * url)"
.PP
Recirects to the specified url.Remember that you cannot send any header before this function, or it will not work. \fBNote:\fP
.br
 LibCGI does not implement RFC 2396 to make the lib simple and quick. You should be sure to pass a correct URI to this function. 
.PP
\fBParameters:\fP
.RS 4
\fIurl\fP url to redirect the browser
.RE
.PP
.PP
.nf

 cgi_redirect('http://wwww.linux.org');
 
.PP

.SS "void cgi_send_header (const char * header)"
.PP
Sends a specific header.Sends a specific HTTP header. You won't need to add '\\n\\n' chars. 
.PP
\fBParameters:\fP
.RS 4
\fIheader\fP HTTP header to send, without new line characteres 
.RE
.PP
\fBReturns:\fP
.RS 4
True 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBcgi_init_headers\fP 
.RE
.PP

.SS "char* cgi_unescape_special_chars (char * str)"
.PP
Transforms' URL special chars.Search for special chars ( like %E1 ) in str, converting them to the ascii character correspondent. 
.PP
\fBParameters:\fP
.RS 4
\fIstr\fP String containing data to parse 
.RE
.PP
\fBReturns:\fP
.RS 4
The new string 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBcgi_escape_special_chars\fP 
.RE
.PP