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
62 int
__strverscmp(const char * s1,const char * s2)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
132 weak_alias (__strverscmp, strverscmp)
133 #endif
134