mystring.c

/*
Weborf
Copyright (C) 2007  Salvo "LtWorf" Tomaselli

Weborf is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

@author Salvo "LtWorf" Tomaselli <tiposchi@tiscali.it>
 */

#include "options.h"

#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#include <ctype.h>

#include "mystring.h"

/**
This function converts a string to upper case
*/
void strToUpper(char *str) {
    int i = -1;
    while (str[++i]) {
        str[i] = toupper(str[i]);
    }
}

/**
This function splits the page name from the GET params.
It also sets the value for the page_len field
*/
void split_get_params(connection_t* connection_prop) {
    char *separator=strstr(connection_prop->page,"?");

    if (separator==NULL) {
        connection_prop->get_params=NULL;
        connection_prop->page_len=strlen(connection_prop->page);
    } else {
        separator[0]=0;
        connection_prop->get_params=separator+1;
        connection_prop->page_len=separator-connection_prop->page;
    }
}


/**
Replaces escape sequences in the form %HEXCODE with the correct char
This is used for URLs, after the transformation the URL will probably
represent a file that exists on filesystem.
Since after this replace the string will be unchanged or shorter, no
additional buffer will be needed.

This function is in-place, doesn't create copies but changes the original string.
*/
void replaceEscape(char *string) {
    char e_seq[3];
    e_seq[2] = 0;

    if (string == NULL)
        return;

    //Parses the string
    while ((string=strstr(string,"%"))!=NULL) {
        e_seq[0] = string[1];
        e_seq[1] = string[2];

        delChar(string, 0, 2);  //Deletes 2 chars from the url

        //Replaces the 3rd character with the char corresponding to the escape
        string[0] = strtol(e_seq, NULL, 16);
        string++;
    }
}

/**
This function replaces, within the string string, the substring substr with the char with.

This function is in-place, doesn't create copies but changes the original string.
*/
void strReplace(char *string, char *substr, char with) {
    char *pointer;
    int substrlen = strlen(substr);

    while ((pointer = strstr(string, substr)) != NULL) {
        delChar(pointer, 0, substrlen - 1);
        pointer[0] = with;
        string=pointer;
    }
}

/**
This function deletes n chars from the string, starting from the position pos.
In case deleting of more chars than the string's len itself, the string will be returned unchanged.

This function doesn't create copies but changes the original string.
*/
void delChar(char *string, int pos, int n) {
    size_t l = strlen(string + pos);

    if (l < n)
        return;
    l -= n;
    memmove(string + pos, string + pos + n, l);
    string[l] = 0;

    return;
}

/**
Returns true if str ends with end

str String to compare
end second string
size of str
size of end

If str ends with end, true is returned
false otherwise
*/
bool endsWith(char *str, char *end, size_t len_str, size_t len_end) {
    return strcmp(str+len_str-len_end,end)==0;
}