// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.

#ifndef tools_cstr
#define tools_cstr

#include <cstring> // strcpy
#include <cstdlib> // malloc,free

#ifdef TOOLS_MEM
#include "mem"
#endif

namespace tools {

// NOTE : have str_ to avoid clashes with various strxxx cpp macro
//        that may come from C or system headers.

#ifdef TOOLS_MEM
inline const std::string& s_cstr() {
  static const std::string s_v("tools::cstr");
  return s_v;
}
#endif

inline char* str_dup(const char* a_cstr
#ifdef TOOLS_MEM
                     ,bool a_inc = true
#endif		     
		     ) {
#ifdef TOOLS_MEM
  if(a_inc) mem::increment(s_cstr().c_str());
#endif
  return ::strcpy((char*)::malloc(::strlen(a_cstr)+1),a_cstr);
}

inline void str_del(char*& a_cstr) {
  if(a_cstr==NULL) return;
  ::free(a_cstr);
#ifdef TOOLS_MEM
  mem::decrement(s_cstr().c_str());
#endif
  a_cstr = NULL;
}

inline char* str_new(size_t a_l = 0,char a_char = ' ') {
  char* s = (char*)::malloc((a_l+1)*sizeof(char));
  if(s==NULL) return NULL;
#ifdef TOOLS_MEM
  mem::increment(s_cstr().c_str());
#endif
  char* pos = s; 
  for(size_t c=0;c<a_l;c++,pos++) *pos = a_char;
  *(s+a_l) = 0;
  return s;
}

inline bool str_cat(char*& a_1,const char a_c) {
  size_t l1 = ::strlen(a_1);
  char* s = (char*)::malloc(l1+1+1);
  if(!s) return false;
#ifdef TOOLS_MEM
  mem::increment(s_cstr().c_str());
#endif
  ::memcpy(s,a_1,l1);
  ::memcpy(s+l1,&a_c,1);
  *(s+l1+1) = 0;
  ::free(a_1);
#ifdef TOOLS_MEM
  mem::decrement(s_cstr().c_str());
#endif
  a_1 = s;
  return true;
}

inline bool str_cat(char*& a_1,const char* a_2) {
  size_t l1 = ::strlen(a_1);
  size_t l2 = ::strlen(a_2);
  char* s = (char*)::malloc(l1+l2+1);
  if(!s) return false;
#ifdef TOOLS_MEM
  mem::increment(s_cstr().c_str());
#endif
  ::memcpy(s,a_1,l1);
  ::memcpy(s+l1,a_2,l2);
  *(s+l1+l2) = 0;
  ::free(a_1);
#ifdef TOOLS_MEM
  mem::decrement(s_cstr().c_str());
#endif
  a_1 = s;
  return true;
}

inline void str_rev(char* a_s) {
  size_t l = ::strlen(a_s);
  size_t hl = l/2;
  char* beg = a_s;
  char* end = a_s+l-1;
  for(size_t i=0;i<hl;i++) {
    char c = *end;
    *end = *beg;      
    *beg = c;
    beg++;end--;  
  }
}

inline char* str_sub(const char* a_s,
                     unsigned int a_pos,
                     unsigned int a_sz = 0) { //0 = take up end.
  size_t l = ::strlen(a_s);
  if(a_pos>=l) return 0; //throw std::out_of_range
  size_t ls;
  if(a_sz) {
    ls = (a_sz<(l-a_pos)?a_sz:(l-a_pos)); //min(a_sz,l-a_pos)
  } else {
    ls = l-a_pos;
  }
  char* s = (char*)::malloc(ls+1);
  if(!s) return 0;
#ifdef TOOLS_MEM
  mem::increment(s_cstr().c_str());
#endif
  //abcdefgh  l=8
  //0123456789
  ::memcpy(s,a_s+a_pos,ls);
  *(s+ls) = 0;
  return s;
}

inline char* str_rep(const char* a_s,unsigned int a_pos,unsigned int a_sz,const char* a_new) {
  //not tested yet.
  size_t las = ::strlen(a_s);
  if(a_pos>=las) return 0; //throw std::out_of_range
  if(a_pos+a_sz>las) return 0;
  size_t lan = ::strlen(a_new);
  unsigned int num = a_sz<lan?a_sz:(unsigned int)lan;
  //abcdefghij : l = 10
  //0123456789
  //   p  
  size_t le = las-(a_pos+a_sz);
  size_t ls = a_pos+num+le;
  char* s = (char*)::malloc(ls+1);
  if(!s) return 0;
#ifdef TOOLS_MEM
  mem::increment(s_cstr().c_str());
#endif
  ::memcpy(s,a_s,a_pos);
  ::memcpy(s+a_pos,a_new,num);
  if(le) ::memcpy(s+a_pos+num,a_s+a_pos+a_sz,le);
  *(s+ls) = 0;
  return s;
}

inline void str_skip(char*& a_cstr,char a_c) {
  while(true) {
    if(*a_cstr!=a_c) break;
    a_cstr++;
  }
}

}

#include <clocale>

namespace tools {

inline char* beg_LC_NUMERIC() {
  char* _sl = ::setlocale(LC_NUMERIC,0);
  char* old = _sl?str_dup(_sl):0;
  ::setlocale(LC_NUMERIC,"C");
  return old;
}
inline void end_LC_NUMERIC(char*& a_s) {
  if(a_s) {
    ::setlocale(LC_NUMERIC,a_s);
    str_del(a_s);
  }
}

inline bool str_2d(const char* a_s,double& a_v) {
  char* olcn = beg_LC_NUMERIC();

  char* end;
  a_v = ::strtod(a_s,&end);
  if(end==a_s) {
    a_v = 0;
    end_LC_NUMERIC(olcn);
    return false;
  }

  end_LC_NUMERIC(olcn);
  return true;
}

/*
inline bool str_2d(const char* a_s,double& a_v) {
  char* _sl = ::setlocale(LC_NUMERIC,0);
  char* old = _sl?str_dup(_sl):0;
  ::setlocale(LC_NUMERIC,"C");

  char* end;
  a_v = ::strtod(a_s,&end);
  bool status = true;
  if(end==a_s) {
    status = false;
    a_v = 0;
  }

  if(old) {
    ::setlocale(LC_NUMERIC,old);
    str_del(old);
  }

  return status;
}
*/

}

#endif