libcgi_string.3

c语言cgi库,可以实现用C语言实现CGI脚本

.TH "Strings" 3 "13 Mar 2003" "LibCGI" \" -*- nroff -*-
.ad l
.nh
.SH NAME
Strings \- 
.SH "Detailed Description"
.PP 
General string manipulation and utilities functions.
.SS "Functions"

.in +1c
.ti -1c
.RI "char * \fBstr_base64_encode\fP (char *str)"
.br
.RI "\fIEncodes a given tring to its base64 form.\fP"
.ti -1c
.RI "char * \fBstr_base64_decode\fP (char *str)"
.br
.RI "\fIDecode a base64 encoded string.\fP"
.ti -1c
.RI "char * \fBaddnslashes\fP (char *s, int n)"
.br
.RI "\fISame to \fBaddslashes()\fP, except that this one only do the action while 'n' is great than 0.\fP"
.ti -1c
.RI "char * \fBaddslashes\fP (char *s)"
.br
.RI "\fIAdd slashes to a string when necessary.\fP"
.ti -1c
.RI "char * \fBstripnslashes\fP (char *s, int n)"
.br
.RI "\fIStrip no more than 'n' slashes from a string.\fP"
.ti -1c
.RI "char * \fBstripslashes\fP (char *str)"
.br
.RI "\fIStrip slashes from a string.\fP"
.ti -1c
.RI "void \fBltrim\fP (char *str)"
.br
.RI "\fIStrip left white spaces from a string.\fP"
.ti -1c
.RI "void \fBrtrim\fP (char *str)"
.br
.RI "\fIStrip right white spaces from a string.\fP"
.ti -1c
.RI "void \fBtrim\fP (char *str)"
.br
.RI "\fIStrip both left and right white spaces from a string.\fP"
.ti -1c
.RI "char * \fBsubstr\fP (char *src, const int start, const int count)"
.br
.RI "\fICopy part of a string.\fP"
.ti -1c
.RI "char ** \fBexplode\fP (char *src, const char *token, int *total)"
.br
.RI "\fICreate an array from a string separated by some special char.\fP"
.ti -1c
.RI "char * \fBstr_nreplace\fP (char *src, const char *delim, const char *with, int n)"
.br
.RI "\fIReplace characteres in a string, but not more than 'n'.\fP"
.ti -1c
.RI "char * \fBstr_replace\fP (char *str, const char *delim, const char *with)"
.br
.RI "\fIReplace characteres in a string.\fP"
.ti -1c
.RI "int \fBstrnpos\fP (char *s, char *ch, unsigned int count)"
.br
.RI "\fIReturns the position of a character in a string, but parses no more that 'n' chars.\fP"
.ti -1c
.RI "int \fBstrpos\fP (char *s, char *ch)"
.br
.RI "\fIReturns the position of a character in a string.\fP"
.ti -1c
.RI "char * \fBstrdel\fP (char *s, int start, int count)"
.br
.RI "\fIDelete characters from a string.\fP"
.ti -1c
.RI "char * \fBrecvline\fP (FILE *s)"
.br
.RI "\fIReads an entire line.\fP"
.ti -1c
.RI "char * \fBmake_string\fP (char *s,...)"
.br
.RI "\fIMakes a string.\fP"
.in -1c
.SH "Function Documentation"
.PP 
.SS "char* addnslashes (char * s, int n)"
.PP
Same to \fBaddslashes()\fP, except that this one only do the action while 'n' is great than 0.\fBParameters:\fP
.RS 4
\fIs\fP String to parse 
.br
\fIn\fP Number of characters to work with. 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBaddslashes()\fP 
.PP
.nf

 char *name = 'My test string is called \'foobar\'';
 puts(name); // will display My test string is called 'foobar'
 
 name = addnslashes(name, 31);
 puts(name); // will display My test string is called \'foobar'
 

.PP
.RE
.PP

.SS "char* addslashes (char * s)"
.PP
Add slashes to a string when necessary.Adds a '\\' in every quote ( ' ), apostrophe ( ' ) or backslash ( \\ ) It's useful when working with databases, for example, because someone can try insert this caracters to try hack the application... 
.PP
\fBParameters:\fP
.RS 4
\fI*s\fP String to parse 
.RE
.PP
\fBReturns:\fP
.RS 4
The new string, with slashes 
.RE
.PP
\fBSee also:\fP
.RS 4
stripslashes, addnslashes
.RE
.PP
.PP
.nf

 char *name = 'My test string is called \'foobar\'';
 puts(name); // will display My test string is called 'foobar'
 
 name = addslashes(name);
 puts(name); // will display My test string is called \'foobar\'
 
.PP

.SS "char** explode (char * src, const char * token, int * total)"
.PP
Create an array from a string separated by some special char.Divides the src string in pieces, each delimited by token and storing the total of pieces in total 
.PP
\fBParameters:\fP
.RS 4
\fIsrc\fP String to parse 
.br
\fItoken\fP Character delimiter to search. 
.br
\fItotal\fP An integer variable passed as reference, which stores the total of itens of the array 
.RE
.PP
\fBReturns:\fP
.RS 4
The array, where each item is one separeted by token
.RE
.PP
.PP
.nf

  
  char **pieces;
  char *name = 'This,is,a,string,of,test';
  int total, i;
  pieces = explode(name, ',', &total);
  for (i = 0; i < total; i++)
        printf('Piece %d: %s\n', i, *(pieces+i));
 
.PP

.SS "void ltrim (char * str)"
.PP
Strip left white spaces from a string.\fBParameters:\fP
.RS 4
\fIstr\fP String to parse 
.RE
.PP
\fBReturns:\fP
.RS 4
The new string, without left spaces 
.RE
.PP
\fBAuthor:\fP
.RS 4
Original code was contribuition by Erik Jansson 
.RE
.PP
\fBSee also:\fP
.RS 4
rtrim, trim
.RE
.PP
.PP
.nf

 char *s = '     String with spaces    ';
 printf('_%s_\n', s);
 s = ltrim(s);
 printf('_%s_\n', s);
 
.PP

.SS "char* make_string (char * s, ...)"
.PP
Makes a string.Works like printf(), with the difference that it returns a string that is the concatenation of the values passed as parameter.
.PP
\fBParameters:\fP
.RS 4
\fI*s\fP Inicial String and optionally formatation parameters ( just s is allowed ) 
.RE
.PP
\fBReturns:\fP
.RS 4
The new String 
.PP
.nf

 char *sql = make_string('INSERT INTO myTable VALUES ('%s', '%s', '%s')', varValue1, varValue2, varValue3);
 

.PP
.RE
.PP
\fBTodo\fP
.RS 4
String limits/error checking 
.RE
.PP

.SS "char* recvline (FILE * s)"
.PP
Reads an entire line.Reads a line from the file specified by the file pointer passed as parameter. This function is intead to replace the non-portable GNU getline() function.
.PP
\fBParameters:\fP
.RS 4
\fIs\fP File pointer to the file to read from. 
.RE
.PP
\fBReturns:\fP
.RS 4
String containing the line read or NULL if no more line are available 
.RE
.PP
\fBAuthor:\fP
.RS 4
Robert Csok 
.RE
.PP

.SS "void rtrim (char * str)"
.PP
Strip right white spaces from a string.\fBParameters:\fP
.RS 4
\fIstr\fP String to parse 
.RE
.PP
\fBReturns:\fP
.RS 4
The new string, without left spaces 
.RE
.PP
\fBAuthor:\fP
.RS 4
Original code was contribuition by Erik Jansson 
.RE
.PP
\fBSee also:\fP
.RS 4
ltrim, trim
.RE
.PP
.PP
.nf

 char *s = '     String with spaces    ';
 printf('_%s_\n', s);
 s = rtrim(s);
 printf('_%s_\n', s);
 
.PP

.SS "char* str_base64_decode (char * str)"
.PP
Decode a base64 encoded string.\fBParameters:\fP
.RS 4
\fI*str\fP Encoded String to decode 
.RE
.PP
\fBReturns:\fP
.RS 4
The decoded string 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBstr_base64_encode\fP 
.RE
.PP

.SS "char* str_base64_encode (char * str)"
.PP
Encodes a given tring to its base64 form.\fBParameters:\fP
.RS 4
\fI*str\fP String to convert 
.RE
.PP
\fBReturns:\fP
.RS 4
Base64 encoded String 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBstr_base64_decode\fP 
.RE
.PP

.SS "char* str_nreplace (char * src, const char * delim, const char * with, int n)"
.PP
Replace characteres in a string, but not more than 'n'.Replace all occourences of *delim on *src with characteres pointed by *with, stopping after 'n' char. 
.PP
\fBParameters:\fP
.RS 4
\fI*src\fP String to parse 
.br
\fI*delim\fP Character to search that will be replaced 
.br
\fIwith\fP String to replace with 
.br
\fIn\fP Maximum number of chars to parse 
.RE
.PP
\fBReturns:\fP
.RS 4
The new string 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBstr_replace\fP
.RE
.PP
.PP
.nf

  char *linux = 'Linux C';
  linux = str_nreplace(linux, 'C', 'Cool', strlen(linux));
  puts(linux);
 //  -- OR --
  char *name = 'rAfAel steil';
  name = str_nreplace(name, 'A', 'a', 3);
  puts(name);
  
.PP

.SS "char* str_replace (char * str, const char * delim, const char * with)"
.PP
Replace characteres in a string.Replace all occourences of *delim on *src with characteres pointed by *with. The problem with the folowing code is that the function only searches for the first caracter of *delim, ingoring the rest. Other problem is speed relacioned: note that the function ever compare the length of *with to do the correct action. 
.PP
\fBParameters:\fP
.RS 4
\fIsrc\fP String to parse 
.br
\fIdelim\fP Character to search that will be replaced 
.br
\fIwith\fP String to replace with 
.RE
.PP
\fBReturns:\fP
.RS 4
The new string 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBstr_nreplace\fP
.RE
.PP
.PP
.nf

  char *linux = 'Linux C';
  linux = str_replace(linux, 'C', 'Cool');
  puts(linux);
 //  -- OR --
  char *name = 'rAfAel steil';
  name = str_replace(name, 'A', 'a');
  puts(name);
  
.PP

.SS "char* strdel (char * s, int start, int count)"
.PP
Delete characters from a string.Delete count characters of s, starting in start 
.PP
\fBParameters:\fP
.RS 4
\fIs\fP String to search 
.br
\fIstart\fP Initial offset to begin search 
.br
\fIcount\fP Number of characteres to delete 
.RE
.PP
\fBReturns:\fP
.RS 4
The new string 
.RE
.PP
\fBSee also:\fP
.RS 4
strndel()
.RE
.PP
.PP
.nf

  *txt = 'Some text to test anything';
  puts(txt);
  txt = strdel(txt, 2, 8);
  puts(txt);
 
.PP

.SS "char* stripnslashes (char * s, int n)"
.PP
Strip no more than 'n' slashes from a string.Strip the backslash character ( \\ ) from a string, stopping after 'n' char 
.PP
\fBParameters:\fP
.RS 4
\fIs\fP String to parse 
.br
\fIn\fP Maximum number of chars to parse 
.RE
.PP
\fBReturns:\fP
.RS 4
The new string, without slashes 
.RE
.PP
\fBSee also:\fP
.RS 4
addslashes, stripslashes
.RE
.PP
.PP
.nf

 char *name = 'My another string is called \\\'blablabla\\\'';
 puts(name); // will display My another string is called \'blablabla\'
 name = stripslashes(name, 33);
 puts(name); // will display My another string is called 'blablabla\'
 
.PP

.SS "char* stripslashes (char * str)"
.PP
Strip slashes from a string.Strip the backslash character ( \\ ) from a string 
.PP
\fBParameters:\fP
.RS 4
\fIs\fP String to parse 
.RE
.PP
\fBReturns:\fP
.RS 4
The new string, without slashes 
.RE
.PP
\fBSee also:\fP
.RS 4
addslashes, stripnslashes
.RE
.PP
.PP
.nf

 char *name = 'My another string is called \\\'blablabla\\\'';
 puts(name); // will display My another string is called \'blablabla\'
 name = stripslashes(name);
 puts(name); // will display My another string is called 'blablabla'
 
.PP

.SS "int strnpos (char * s, char * ch, unsigned int count)"
.PP
Returns the position of a character in a string, but parses no more that 'n' chars.\fBParameters:\fP
.RS 4
\fIs\fP String where the search will be done 
.br
\fIch\fP Character to search 
.br
\fIcount\fP Maximum number of chars to parse before exiting the function 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBstrpos()\fP 
.RE
.PP

.SS "int strpos (char * s, char * ch)"
.PP
Returns the position of a character in a string.\fBParameters:\fP
.RS 4
\fIs\fP String where the search will be done 
.br
\fIch\fP Character to search 
.br
\fIcount\fP Maximum number of ch to search 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBstrnpos()\fP 
.RE
.PP

.SS "char* substr (char * src, const int start, const int count)"
.PP
Copy part of a string.Copy count characters from src, starting from start 
.PP
\fBParameters:\fP
.RS 4
\fIsrc\fP String to copy from 
.br
\fIstart\fP Initial offset 
.br
\fIcount\fP Number of chars to copy 
.RE
.PP
\fBReturns:\fP
.RS 4
The new string
.RE
.PP
.PP
.nf

 char *part, *str = 'Test one, test two';
 part = substr(str, 1, 5);
 puts(part); // -> est o
 
.PP

.SS "void trim (char * str)"
.PP
Strip both left and right white spaces from a string.\fBParameters:\fP
.RS 4
\fIstr\fP String to parse 
.RE
.PP
\fBReturns:\fP
.RS 4
The new string, without left spaces 
.RE
.PP
\fBAuthor:\fP
.RS 4
Original code was contribuition by Erik Jansson 
.RE
.PP
\fBSee also:\fP
.RS 4
ltrim, trim
.RE
.PP
.PP
.nf

 char *s = '     String with spaces    ';
 printf('_%s_\n', s);
 s = trim(s);
 printf('_%s_\n', s);
 
.PP