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o_parse.cpp
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C/C++ Source or Header
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1996-09-03
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3KB
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153 lines
//
// Split the components of a CGI result string into
// individual sub strings
//
// For example the string
// name=Your+name&action=%2B10%25&log=~mas/log
//
// is composed of two named elements:
//
// Element String associated with element
// name Your name
// action +10%
// log /usr/staff/mas/log
//
// (C) M.A.Smith University of Brighton
// Permission is granted to use this code
// provided this declaration and copyright notice remains intact.
// 26 August 1995
//
//
// I m p l e m e n t a t i o n
#ifndef CLASS_PARSE_IMP
#define CLASS_PARSE_IMP
#define "parse.h"
#include <string.h>
#include <ctype.h>
#ifndef NO_MAP
# include <pwd.h>
#endif
Parse::Parse( char list[] )
{
the_str = NULL;
set( list );
}
Parse::~Parse()
{
if ( the_str != NULL ) { // Release storage
delete the_str;
}
}
void Parse::set( char list[] )
{
if ( the_str != NULL ) { // Release storage
delete the_str;
}
the_length = strlen( list ); // Length of string
the_str = new char[the_length+1]; // Allocate area
strcpy( the_str, list ); // copy to
}
char *Parse::get_item( char name[], bool file )
{
int len = strlen( name );
for( int i=0; i<the_length-len; i++ )
{
if ( the_str[i] == name[0] &&
strncmp( &the_str[i], name, len ) == 0 )
{
if ( the_str[i+len] == '=' )
{
int start = i+len+1; int j = start;
while ( the_str[j] != SEP && the_str[j] != '\0' ) j++;
int str_len = j-start;
char *mes = new char[ str_len+1 ];
strncpy( mes, &the_str[start], str_len );
mes[str_len] = '\0';
remove_escape( mes );
# ifndef NO_MAP
return file ? map_uname(mes) : mes;
# else
return file ? mes : mes;
# endif
}
}
}
return NULL;
}
char *Parse::get_item_n( char name[], bool file )
{
char *res = get_item( name, file );
return res == NULL ? "" : res;
}
void Parse::remove_escape(char str[])
{
char * from = &str[0];
char * to = &str[0];
while ( *from != '\0' )
{
char ch = *from++;
switch ( ch )
{
case '%' :
ch = (hex(*from++)<<4) | hex(*from++);
break;
case '+' :
ch = ' '; break;
}
*to++ = ch;
}
*to = '\0';
}
int Parse::hex( char c )
{
if ( isdigit( c ) )
return c-'0';
if ( isalpha( c ) )
return tolower(c)-'a'+10;
return 0;
}
char* Parse::map_uname( char *path )
{
#ifndef NO_MAP
if ( path[0] == '~' )
{
char uname[255];
char *rest = &path[1], *p = &uname[0];
while ( *rest != '/' && *rest != '\0' ) {
*p++ = *rest++;
}
*p = '\0';
char *root = uname; // If fails
passwd *pw = getpwnam( uname ); // Structure about user
if ( pw != NULL )
{
root = pw->pw_dir; // Users home directory
}
int len_root = strlen(root);
int len_path = len_root + strlen(rest);
char *new_path = new char[len_path+1];
strcpy( &new_path[0], root ); // Build abs path
strcpy( &new_path[len_root], rest );
new_path[ len_path ] = '\0';
return new_path;
} else {
return path;
}
#endif
return path;
}
#endif