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/* Compare strings while treating digits characters numerically.
/* Compare strings while treating digits characters numerically.
   Copyright (C) 1997, 2002, 2005 Free Software Foundation, Inc.
   Copyright (C) 1997, 2002, 2005 Free Software Foundation, Inc.
   This file is part of the libiberty library.
   This file is part of the libiberty library.
   Contributed by Jean-François Bignolles <bignolle@ecoledoc.ibp.fr>, 1997.
   Contributed by Jean-François Bignolles <bignolle@ecoledoc.ibp.fr>, 1997.
 
 
   Libiberty is free software; you can redistribute it and/or
   Libiberty is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.
   version 2.1 of the License, or (at your option) any later version.
 
 
   Libiberty is distributed in the hope that it will be useful,
   Libiberty is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
   Lesser General Public License for more details.
 
 
   You should have received a copy of the GNU Lesser General Public
   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301 USA.  */
   02110-1301 USA.  */
 
 
#include "libiberty.h"
#include "libiberty.h"
#include "safe-ctype.h"
#include "safe-ctype.h"
 
 
/*
/*
@deftypefun int strverscmp (const char *@var{s1}, const char *@var{s2})
@deftypefun int strverscmp (const char *@var{s1}, const char *@var{s2})
The @code{strverscmp} function compares the string @var{s1} against
The @code{strverscmp} function compares the string @var{s1} against
@var{s2}, considering them as holding indices/version numbers.  Return
@var{s2}, considering them as holding indices/version numbers.  Return
value follows the same conventions as found in the @code{strverscmp}
value follows the same conventions as found in the @code{strverscmp}
function.  In fact, if @var{s1} and @var{s2} contain no digits,
function.  In fact, if @var{s1} and @var{s2} contain no digits,
@code{strverscmp} behaves like @code{strcmp}.
@code{strverscmp} behaves like @code{strcmp}.
 
 
Basically, we compare strings normally (character by character), until
Basically, we compare strings normally (character by character), until
we find a digit in each string - then we enter a special comparison
we find a digit in each string - then we enter a special comparison
mode, where each sequence of digits is taken as a whole.  If we reach the
mode, where each sequence of digits is taken as a whole.  If we reach the
end of these two parts without noticing a difference, we return to the
end of these two parts without noticing a difference, we return to the
standard comparison mode.  There are two types of numeric parts:
standard comparison mode.  There are two types of numeric parts:
"integral" and "fractional" (those  begin with a '0'). The types
"integral" and "fractional" (those  begin with a '0'). The types
of the numeric parts affect the way we sort them:
of the numeric parts affect the way we sort them:
 
 
@itemize @bullet
@itemize @bullet
@item
@item
integral/integral: we compare values as you would expect.
integral/integral: we compare values as you would expect.
 
 
@item
@item
fractional/integral: the fractional part is less than the integral one.
fractional/integral: the fractional part is less than the integral one.
Again, no surprise.
Again, no surprise.
 
 
@item
@item
fractional/fractional: the things become a bit more complex.
fractional/fractional: the things become a bit more complex.
If the common prefix contains only leading zeroes, the longest part is less
If the common prefix contains only leading zeroes, the longest part is less
than the other one; else the comparison behaves normally.
than the other one; else the comparison behaves normally.
@end itemize
@end itemize
 
 
@smallexample
@smallexample
strverscmp ("no digit", "no digit")
strverscmp ("no digit", "no digit")
    @result{} 0    // @r{same behavior as strcmp.}
    @result{} 0    // @r{same behavior as strcmp.}
strverscmp ("item#99", "item#100")
strverscmp ("item#99", "item#100")
    @result{} <0   // @r{same prefix, but 99 < 100.}
    @result{} <0   // @r{same prefix, but 99 < 100.}
strverscmp ("alpha1", "alpha001")
strverscmp ("alpha1", "alpha001")
    @result{} >0   // @r{fractional part inferior to integral one.}
    @result{} >0   // @r{fractional part inferior to integral one.}
strverscmp ("part1_f012", "part1_f01")
strverscmp ("part1_f012", "part1_f01")
    @result{} >0   // @r{two fractional parts.}
    @result{} >0   // @r{two fractional parts.}
strverscmp ("foo.009", "foo.0")
strverscmp ("foo.009", "foo.0")
    @result{} <0   // @r{idem, but with leading zeroes only.}
    @result{} <0   // @r{idem, but with leading zeroes only.}
@end smallexample
@end smallexample
 
 
This function is especially useful when dealing with filename sorting,
This function is especially useful when dealing with filename sorting,
because filenames frequently hold indices/version numbers.
because filenames frequently hold indices/version numbers.
@end deftypefun
@end deftypefun
 
 
*/
*/
 
 
/* states: S_N: normal, S_I: comparing integral part, S_F: comparing
/* states: S_N: normal, S_I: comparing integral part, S_F: comparing
           fractional parts, S_Z: idem but with leading Zeroes only */
           fractional parts, S_Z: idem but with leading Zeroes only */
#define  S_N    0x0
#define  S_N    0x0
#define  S_I    0x4
#define  S_I    0x4
#define  S_F    0x8
#define  S_F    0x8
#define  S_Z    0xC
#define  S_Z    0xC
 
 
/* result_type: CMP: return diff; LEN: compare using len_diff/diff */
/* result_type: CMP: return diff; LEN: compare using len_diff/diff */
#define  CMP    2
#define  CMP    2
#define  LEN    3
#define  LEN    3
 
 
 
 
/* Compare S1 and S2 as strings holding indices/version numbers,
/* Compare S1 and S2 as strings holding indices/version numbers,
   returning less than, equal to or greater than zero if S1 is less than,
   returning less than, equal to or greater than zero if S1 is less than,
   equal to or greater than S2 (for more info, see the Glibc texinfo doc).  */
   equal to or greater than S2 (for more info, see the Glibc texinfo doc).  */
 
 
int
int
strverscmp (const char *s1, const char *s2)
strverscmp (const char *s1, const char *s2)
{
{
  const unsigned char *p1 = (const unsigned char *) s1;
  const unsigned char *p1 = (const unsigned char *) s1;
  const unsigned char *p2 = (const unsigned char *) s2;
  const unsigned char *p2 = (const unsigned char *) s2;
  unsigned char c1, c2;
  unsigned char c1, c2;
  int state;
  int state;
  int diff;
  int diff;
 
 
  /* Symbol(s)    0       [1-9]   others  (padding)
  /* Symbol(s)    0       [1-9]   others  (padding)
     Transition   (10) 0  (01) d  (00) x  (11) -   */
     Transition   (10) 0  (01) d  (00) x  (11) -   */
  static const unsigned int next_state[] =
  static const unsigned int next_state[] =
    {
    {
      /* state    x    d    0    - */
      /* state    x    d    0    - */
      /* S_N */  S_N, S_I, S_Z, S_N,
      /* S_N */  S_N, S_I, S_Z, S_N,
      /* S_I */  S_N, S_I, S_I, S_I,
      /* S_I */  S_N, S_I, S_I, S_I,
      /* S_F */  S_N, S_F, S_F, S_F,
      /* S_F */  S_N, S_F, S_F, S_F,
      /* S_Z */  S_N, S_F, S_Z, S_Z
      /* S_Z */  S_N, S_F, S_Z, S_Z
    };
    };
 
 
  static const int result_type[] =
  static const int result_type[] =
    {
    {
      /* state   x/x  x/d  x/0  x/-  d/x  d/d  d/0  d/-
      /* state   x/x  x/d  x/0  x/-  d/x  d/d  d/0  d/-
                 0/x  0/d  0/0  0/-  -/x  -/d  -/0  -/- */
                 0/x  0/d  0/0  0/-  -/x  -/d  -/0  -/- */
 
 
      /* S_N */  CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
      /* S_N */  CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
                 CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
                 CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
      /* S_I */  CMP, -1,  -1,  CMP, +1,  LEN, LEN, CMP,
      /* S_I */  CMP, -1,  -1,  CMP, +1,  LEN, LEN, CMP,
                 +1,  LEN, LEN, CMP, CMP, CMP, CMP, CMP,
                 +1,  LEN, LEN, CMP, CMP, CMP, CMP, CMP,
      /* S_F */  CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
      /* S_F */  CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
                 CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
                 CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
      /* S_Z */  CMP, +1,  +1,  CMP, -1,  CMP, CMP, CMP,
      /* S_Z */  CMP, +1,  +1,  CMP, -1,  CMP, CMP, CMP,
                 -1,  CMP, CMP, CMP
                 -1,  CMP, CMP, CMP
    };
    };
 
 
  if (p1 == p2)
  if (p1 == p2)
    return 0;
    return 0;
 
 
  c1 = *p1++;
  c1 = *p1++;
  c2 = *p2++;
  c2 = *p2++;
  /* Hint: '0' is a digit too.  */
  /* Hint: '0' is a digit too.  */
  state = S_N | ((c1 == '0') + (ISDIGIT (c1) != 0));
  state = S_N | ((c1 == '0') + (ISDIGIT (c1) != 0));
 
 
  while ((diff = c1 - c2) == 0 && c1 != '\0')
  while ((diff = c1 - c2) == 0 && c1 != '\0')
    {
    {
      state = next_state[state];
      state = next_state[state];
      c1 = *p1++;
      c1 = *p1++;
      c2 = *p2++;
      c2 = *p2++;
      state |= (c1 == '0') + (ISDIGIT (c1) != 0);
      state |= (c1 == '0') + (ISDIGIT (c1) != 0);
    }
    }
 
 
  state = result_type[state << 2 | (((c2 == '0') + (ISDIGIT (c2) != 0)))];
  state = result_type[state << 2 | (((c2 == '0') + (ISDIGIT (c2) != 0)))];
 
 
  switch (state)
  switch (state)
    {
    {
    case CMP:
    case CMP:
      return diff;
      return diff;
 
 
    case LEN:
    case LEN:
      while (ISDIGIT (*p1++))
      while (ISDIGIT (*p1++))
        if (!ISDIGIT (*p2++))
        if (!ISDIGIT (*p2++))
          return 1;
          return 1;
 
 
      return ISDIGIT (*p2) ? -1 : diff;
      return ISDIGIT (*p2) ? -1 : diff;
 
 
    default:
    default:
      return state;
      return state;
    }
    }
}
}
 
 

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