Poor-Mans-IDS/strutil.cpp

//////////////////////////////////////////////////////////////////////
// String splitter & other useful string tools
// Written by Jonathan A. Foster <ChipMaster@YeOlPiShack.net>
// Started April 23rd, 2021
// Copyright JF Possibilities, Inc. All rights reserved.
// Copied with permission from JF Possibilities's C++ lib.
//////////////////////////////////////////////////////////////////////
#include <string.h>
#include <stdio.h>
#include <stdexcept>
// Sounds an awful lot like a German pastry
#include "strutil.h"



//////////////////////////////////////////////////////////////////////
// Generic string transformations
//////////////////////////////////////////////////////////////////////

std::string trim(const std::string &s) {
  int x, y;

  for(x=0; x<s.size() && s[x]<=' '; x++);
  for(y=s.size()-1; y>=x && s[y]<=' '; y--);
  if(y<x) return "";
  return s.substr(x, y-x+1);
}



// You have to have C++11+ to get to_string()
std::string str(long long n) {
  char s[24]; s[23]=0;
  snprintf(s, 23, "%lld", n);
  return std::string(s);
}



//////////////////////////////////////////////////////////////////////
// Splits
//////////////////////////////////////////////////////////////////////

Splits &Splits::operator=(const char *_line) {
  if(strlen(_line)>=LineMax)
    throw std::runtime_error("Splits::Splits(char*): string is longer than buffer");
  strncpy(line, _line, LineMax-1);
  split();
  return *this;
}



int Splits::split() {
  len = count = 0;
  if(!*line) return count;
  fields[0] = line;
  while(len<LineMax && line[len]) {
    if(line[len]==sep) {
      line[len++]=0;
      if(combine) while(len<LineMax && line[len]==sep) len++;
      if(++count<FieldMax) {
        // this shouldn't happen
        if(len>=LineMax) throw
          std::runtime_error("Splits::split: end of buffer null missing!");
        fields[count] = line+len;
      } else
        throw std::runtime_error("Splits::split: Too many fields in the line");
    } else
      len++;
  }
  return count++;
}



std::istream &operator>>(std::istream &in, Splits &sp) {
  if(in.getline(sp.line, sp.LineMax-1)) sp.split();
  return in;
}



//////////////////////////////////////////////////////////////////////
// pre_match()
//////////////////////////////////////////////////////////////////////

bool pre_match(const char **list, const std::string &s) {
  const char *p = s.c_str();
  for(; *list; list++)
    if(!strncmp(*list, p, strlen(*list))) return true;
  return false;
}

// And if vectors can be used...
bool pre_match(const StringList &list, const std::string &s) {
  for(
    StringList::const_iterator p=list.begin();
    p!=list.end();
    p++
  )
    if(s.substr(0, p->size())==*p) return true;
  return false;
}



//////////////////////////////////////////////////////////////////////
// misc
//////////////////////////////////////////////////////////////////////

std::string strip(const std::string &s) {
  int x, y;

  for(x=0; x<s.size() && s[x]<=' '; x++);
  for(y=s.size()-1; y>=x && s[y]<=' '; y--);
  if(y<x) return "";
  return s.substr(x, y-x+1);
}