1/* -*- buffer-read-only: t -*- vi: set ro: */
2/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
3/* Compare strings while treating digits characters numerically.
4   Copyright (C) 1997, 2000, 2002, 2004, 2006 Free Software Foundation, Inc.
5   This file is part of the GNU C Library.
6   Contributed by Jean-François Bignolles <bignolle@ecoledoc.ibp.fr>, 1997.
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 3, or (at your option)
11   any later version.
12
13   This program 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
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License along
19   with this program; if not, write to the Free Software Foundation,
20   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
21
22#if !_LIBC
23# include <config.h>
24#endif
25
26#include <string.h>
27#include <ctype.h>
28
29/* states: S_N: normal, S_I: comparing integral part, S_F: comparing
30           fractional parts, S_Z: idem but with leading Zeroes only */
31#define S_N    0x0
32#define S_I    0x4
33#define S_F    0x8
34#define S_Z    0xC
35
36/* result_type: CMP: return diff; LEN: compare using len_diff/diff */
37#define CMP    2
38#define LEN    3
39
40
41/* ISDIGIT differs from isdigit, as follows:
42   - Its arg may be any int or unsigned int; it need not be an unsigned char
43     or EOF.
44   - It's typically faster.
45   POSIX says that only '0' through '9' are digits.  Prefer ISDIGIT to
46   isdigit unless it's important to use the locale's definition
47   of `digit' even when the host does not conform to POSIX.  */
48#define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
49
50#undef __strverscmp
51#undef strverscmp
52
53#ifndef weak_alias
54# define __strverscmp strverscmp
55#endif
56
57/* Compare S1 and S2 as strings holding indices/version numbers,
58   returning less than, equal to or greater than zero if S1 is less than,
59   equal to or greater than S2 (for more info, see the texinfo doc).
60*/
61
62int
63__strverscmp (const char *s1, const char *s2)
64{
65  const unsigned char *p1 = (const unsigned char *) s1;
66  const unsigned char *p2 = (const unsigned char *) s2;
67  unsigned char c1, c2;
68  int state;
69  int diff;
70
71  /* Symbol(s)    0       [1-9]   others  (padding)
72     Transition   (10) 0  (01) d  (00) x  (11) -   */
73  static const unsigned int next_state[] =
74  {
75      /* state    x    d    0    - */
76      /* S_N */  S_N, S_I, S_Z, S_N,
77      /* S_I */  S_N, S_I, S_I, S_I,
78      /* S_F */  S_N, S_F, S_F, S_F,
79      /* S_Z */  S_N, S_F, S_Z, S_Z
80  };
81
82  static const int result_type[] =
83  {
84      /* state   x/x  x/d  x/0  x/-  d/x  d/d  d/0  d/-
85                 0/x  0/d  0/0  0/-  -/x  -/d  -/0  -/- */
86
87      /* S_N */  CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
88                 CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
89      /* S_I */  CMP, -1,  -1,  CMP,  1,  LEN, LEN, CMP,
90                  1,  LEN, LEN, CMP, CMP, CMP, CMP, CMP,
91      /* S_F */  CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
92                 CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
93      /* S_Z */  CMP,  1,   1,  CMP, -1,  CMP, CMP, CMP,
94                 -1,  CMP, CMP, CMP
95  };
96
97  if (p1 == p2)
98    return 0;
99
100  c1 = *p1++;
101  c2 = *p2++;
102  /* Hint: '0' is a digit too.  */
103  state = S_N | ((c1 == '0') + (ISDIGIT (c1) != 0));
104
105  while ((diff = c1 - c2) == 0 && c1 != '\0')
106    {
107      state = next_state[state];
108      c1 = *p1++;
109      c2 = *p2++;
110      state |= (c1 == '0') + (ISDIGIT (c1) != 0);
111    }
112
113  state = result_type[state << 2 | ((c2 == '0') + (ISDIGIT (c2) != 0))];
114
115  switch (state)
116    {
117    case CMP:
118      return diff;
119
120    case LEN:
121      while (ISDIGIT (*p1++))
122	if (!ISDIGIT (*p2++))
123	  return 1;
124
125      return ISDIGIT (*p2) ? -1 : diff;
126
127    default:
128      return state;
129    }
130}
131#ifdef weak_alias
132weak_alias (__strverscmp, strverscmp)
133#endif
134