xapian-applications/omega/utils.cc

   1 /** @file
   2  * @brief string conversion utility functions for omega
   3  */
   4 /* Copyright 1999,2000,2001 BrightStation PLC
   5  * Copyright 2003,2004,2006,2010,2011,2019 Olly Betts
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
  20  * USA
  21  */
  22
  23 #include <config.h>
  24
  25 #include "utils.h"
  26
  27 #include <cassert>
  28 #include <cstdio> // for snprintf
  29 #include <cstdlib>
  30
  31 #include <string>
  32
  33 using namespace std;
  34
  35 int
  36 string_to_int(const string &s)
  37 {
  38     return atoi(s.c_str());
  39 }
  40
  41 string
  42 double_to_string(double val)
  43 {
  44     // This should be more than enough.
  45     const int BUFSIZE = 100;
  46     char buf[BUFSIZE];
  47     int len = snprintf(buf, BUFSIZE, "%f", val);
  48     return string(buf, (len == -1 || len > BUFSIZE) ? BUFSIZE : len);
  49 }
  50
  51 void
  52 trim(string & s)
  53 {
  54     string::size_type first_nonspace;
  55     first_nonspace = s.find_first_not_of(" \t\r\n\v");
  56     if (first_nonspace == string::npos) {
  57         // String is all whitespace.
  58         s.resize(0);
  59     } else {
  60         // Remove any trailing whitespace.
  61         string::size_type len = s.find_last_not_of(" \t\r\n\v");
  62         assert(len != string::npos);
  63         if (len < s.size() - 1)
  64             s.resize(len + 1);
  65         // Remove any leading whitespace.
  66         if (first_nonspace > 0)
  67             s.erase(0, first_nonspace);
  68     }
  69 }