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 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 <stdio.h> // for sprintf/snprintf
  29 #include <cstdlib>
  30
  31 #include <string>
  32
  33 using namespace std;
  34
  35 // This ought to be enough for any of the conversions below.
  36 #define BUFSIZE 100
  37
  38 #ifdef SNPRINTF
  39 #define CONVERT_TO_STRING(FMT) \
  40     char buf[BUFSIZE];\
  41     int len = SNPRINTF(buf, BUFSIZE, (FMT), val);\
  42     if (len == -1 || len > BUFSIZE) return string(buf, BUFSIZE);\
  43     return string(buf, len);
  44 #else
  45 #define CONVERT_TO_STRING(FMT) \
  46     char buf[BUFSIZE];\
  47     buf[BUFSIZE - 1] = '\0';\
  48     sprintf(buf, (FMT), val);\
  49     if (buf[BUFSIZE - 1]) abort(); /* Uh-oh, buffer overrun */ \
  50     return string(buf);
  51 #endif
  52
  53 int
  54 string_to_int(const string &s)
  55 {
  56     return atoi(s.c_str());
  57 }
  58
  59 string
  60 double_to_string(double val)
  61 {
  62     CONVERT_TO_STRING("%f")
  63 }
  64
  65 string
  66 date_to_string(int y, int m, int d)
  67 {
  68     char buf[11];
  69     if (y < 0) y = 0; else if (y > 9999) y = 9999;
  70     if (m < 1) m = 1; else if (m > 12) m = 12;
  71     if (d < 1) d = 1; else if (d > 31) d = 31;
  72 #ifdef SNPRINTF
  73     int len = SNPRINTF(buf, sizeof(buf), "%04d%02d%02d", y, m, d);
  74     if (len == -1 || len > int(sizeof(buf))) return string(buf, sizeof(buf));
  75     return string(buf, len);
  76 #else
  77     buf[sizeof(buf) - 1] = '\0';
  78     sprintf(buf, "%04d%02d%02d", y, m, d);
  79     if (buf[sizeof(buf) - 1]) abort(); /* Uh-oh, buffer overrun */
  80     return string(buf);
  81 #endif
  82 }
  83
  84 void
  85 trim(string & s)
  86 {
  87     string::size_type first_nonspace;
  88     first_nonspace = s.find_first_not_of(" \t\r\n\v");
  89     if (first_nonspace == string::npos) {
  90         // String is all whitespace.
  91         s.resize(0);
  92     } else {
  93         // Remove any trailing whitespace.
  94         string::size_type len = s.find_last_not_of(" \t\r\n\v");
  95         assert(len != string::npos);
  96         if (len < s.size() - 1)
  97             s.resize(len + 1);
  98         // Remove any leading whitespace.
  99         if (first_nonspace > 0)
 100             s.erase(0, first_nonspace);
 101     }
 102 }