src/numericsort.c

   1 /*
   2  * "$Id: numericsort.c 8074 2010-12-20 13:45:26Z ianmacarthur $"
   3  *
   4  * Numeric sorting routine for the Fast Light Tool Kit (FLTK).
   5  *
   6  * Copyright 1998-2010 by Bill Spitzak and others.
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Library General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Library General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Library General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21  * USA.
  22  *
  23  * Please report all bugs and problems on the following page:
  24  *
  25  *     http://www.fltk.org/str.php
  26  */
  27
  28 /* My own scandir sorting function, useful for the film industry where
  29    we have many files with numbers in their names: */
  30
  31 #include <config.h>
  32 #include <ctype.h>
  33 #include <stdlib.h>
  34 #include <sys/types.h>
  35
  36 #if !defined(WIN32) || defined(__CYGWIN__)
  37 #  ifdef HAVE_DIRENT_H
  38 #    include <dirent.h>
  39 #  else
  40 #    define dirent direct
  41 #    if HAVE_SYS_NDIR_H
  42 #      include <sys/ndir.h>
  43 #    endif /* HAVE_SYS_NDIR_H */
  44 #    if HAVE_SYS_DIR_H
  45 #      include <sys/dir.h>
  46 #    endif /* HAVE_SYS_DIR_H */
  47 #    if HAVE_NDIR_H
  48 #      include <ndir.h>
  49 #    endif /* HAVE_NDIR_H */
  50 #  endif /* HAVE_DIRENT_H */
  51 #else /* For WIN32 variants */
  52 #  include <FL/filename.H>
  53 #endif /* !WIN32 || __CYGWIN__ */
  54
  55 /*
  56  * 'numericsort()' - Compare two directory entries, possibly with
  57  *                   a case-insensitive comparison...
  58  */
  59
  60 static int numericsort(struct dirent **A, struct dirent **B, int cs) {
  61   const char* a = (*A)->d_name;
  62   const char* b = (*B)->d_name;
  63   int ret = 0;
  64   for (;;) {
  65     if (isdigit(*a & 255) && isdigit(*b & 255)) {
  66       int diff,magdiff;
  67       while (*a == '0') a++;
  68       while (*b == '0') b++;
  69       while (isdigit(*a & 255) && *a == *b) {a++; b++;}
  70       diff = (isdigit(*a & 255) && isdigit(*b & 255)) ? *a - *b : 0;
  71       magdiff = 0;
  72       while (isdigit(*a & 255)) {magdiff++; a++;}
  73       while (isdigit(*b & 255)) {magdiff--; b++;}
  74       if (magdiff) {ret = magdiff; break;} /* compare # of significant digits*/
  75       if (diff) {ret = diff; break;}    /* compare first non-zero digit */
  76     } else {
  77       if (cs) {
  78         /* compare case-sensitive */
  79         if ((ret = *a-*b)) break;
  80       } else {
  81         /* compare case-insensitve */
  82         if ((ret = tolower(*a & 255)-tolower(*b & 255))) break;
  83       }
  84
  85       if (!*a) break;
  86       a++; b++;
  87     }
  88   }
  89   if (!ret) return 0;
  90   else return (ret < 0) ? -1 : 1;
  91 }
  92
  93 /*
  94  * 'fl_casenumericsort()' - Compare directory entries with case-sensitivity.
  95  */
  96
  97 int fl_casenumericsort(struct dirent **A, struct dirent **B) {
  98   return numericsort(A, B, 0);
  99 }
 100
 101 /*
 102  * 'fl_numericsort()' - Compare directory entries with case-sensitivity.
 103  */
 104
 105 int fl_numericsort(struct dirent **A, struct dirent **B) {
 106   return numericsort(A, B, 1);
 107 }
 108
 109 /*
 110  * End of "$Id: numericsort.c 8074 2010-12-20 13:45:26Z ianmacarthur $".
 111  */