fluxbox/src/FbTk/StringUtil.cc

// StringUtil.cc for fluxbox 
// Copyright (c) 2001 - 2003 Henrik Kinnunen (fluxgen<at>linuxmail.org)
// 
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

//<2F>$Id: StringUtil.cc,v 1.4 2003/08/10 12:50:04 rathnor Exp $

#include "StringUtil.hh"

#include <string>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cassert>
#include <memory>

using namespace std;

namespace FbTk {

namespace StringUtil {

/**
 Takes a pointer to string *s as an argument,
 creates a new string n, copies s to n and
 returns a pointer to n.
*/
char *strdup(const char *s) {
    int l = strlen(s) + 1;
    char *n = new char[l];
    strncpy(n, s, l);
    return n;
}

/**
 Tries to find a string in another and
 ignoring the case of the characters
 Returns 0 on success else pointer to str.
*/
const char *strcasestr(const char *str, const char *ptn) {
    const char *s2, *p2;
    for( ; *str; str++) {
        for(s2=str, p2=ptn; ; s2++,p2++) {	
            // check if we reached the end of ptn, if so, return str
            if (!*p2) 
                return str;
            // check if the chars match(ignoring case)
            if (toupper(*s2) != toupper(*p2))
                break; 
        }
    }
    return 0;
}

/**
 if ~ then expand it to home of user
 returns expanded filename 
*/
string expandFilename(const std::string &filename) {
    string retval;
    size_t pos = filename.find_first_not_of(" \t");
    if (pos != std::string::npos && filename[pos] == '~') {  	
    	retval = getenv("HOME");
        if (pos != filename.size()) {
            // copy from the character after '~'
            retval += static_cast<const char *>(filename.c_str() + pos + 1);
        }
    } else
        return filename; //return unmodified value

    return retval;
}

/**
 Parses a string between "first" and "last" characters
 and ignoring ok_chars as whitespaces. The value is
 returned in "out".
 Returns negative value on error and this value is the position 
 in the in-string where the error occured.
 Returns positive value on success and this value is
 for the position + 1 in the in-string where the "last"-char value
 was found.
*/
int getStringBetween(std::string& out, const char *instr, const char first, const char last,
                     const char *ok_chars, bool allow_nesting) {
    assert(first);
    assert(last);
    assert(instr);
	
    std::string::size_type i = 0, 
        total_add=0; //used to add extra if there is a \last to skip
    std::string in(instr);
	
    // eat leading whitespace
    i = in.find_first_not_of(ok_chars);
    if (i == std::string::npos)
        return -in.size();   // nothing left but whitespace

    if (in[i]!=first)		
        return -i; //return position to error	

    // find the end of the token
    std::string::size_type j = i, k;
    int nesting = 0;
    while (1) {
        k = in.find_first_of(first, j+1);
        j = in.find_first_of(last, j+1);
        if (j==std::string::npos)
            return -in.size(); //send negative size

        if (allow_nesting && k < j && in[k-1] != '\\') {
            nesting++;
            j = k;
            continue;
        }
        //we found the last char, check so it doesn't have a '\' before
        if (j>1 && in[j-1] != '\\') {
            if (allow_nesting && nesting > 0) nesting--;
            else
                break;
        } else if (j>1 && !allow_nesting) { // we leave escapes if we're allowing nesting
            in.erase(j-1, 1); //remove the '\'
            j--;
            total_add++; //save numchars removed so we can calculate totalpos
        }
    }

    out = in.substr(i+1, j-i-1); //copy the string between first and last		
    //return value to last character
    return (j+1+total_add);
}

void toLower(char * const conv) {
    for (size_t byte_pos = 0; byte_pos < strlen(conv); ++byte_pos)
        conv[byte_pos] = tolower(conv[byte_pos]);
}

std::string toLower(const std::string &conv) {
    char ret_str[conv.size()+1]; 
    ::strcpy(ret_str, conv.c_str());
    toLower(ret_str);
    return ret_str;
}

}; // end namespace StringUtil

}; // end namespace FbTk