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-rw-r--r--src/daemon/https/lgl/strverscmp.c130
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diff --git a/src/daemon/https/lgl/strverscmp.c b/src/daemon/https/lgl/strverscmp.c
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1/* Compare strings while treating digits characters numerically.
2 Copyright (C) 1997, 2000, 2002, 2004, 2006 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Jean-Fran├žois Bignolles <bignolle@ecoledoc.ibp.fr>, 1997.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1, or (at your option)
9 any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License along
17 with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
19
20#if !_LIBC
21#include "MHD_config.h"
22#endif
23
24#include <string.h>
25#include <ctype.h>
26
27/* states: S_N: normal, S_I: comparing integral part, S_F: comparing
28 fractional parts, S_Z: idem but with leading Zeroes only */
29#define S_N 0x0
30#define S_I 0x4
31#define S_F 0x8
32#define S_Z 0xC
33
34/* result_type: CMP: return diff; LEN: compare using len_diff/diff */
35#define CMP 2
36#define LEN 3
37
38
39/* ISDIGIT differs from isdigit, as follows:
40 - Its arg may be any int or unsigned int; it need not be an unsigned char
41 or EOF.
42 - It's typically faster.
43 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
44 isdigit unless it's important to use the locale's definition
45 of `digit' even when the host does not conform to POSIX. */
46#define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
47
48#undef __MHD_strverscmp
49#undef MHD_strverscmp
50
51#ifndef weak_alias
52# define __MHD_strverscmp MHD_strverscmp
53#endif
54
55/* Compare S1 and S2 as strings holding indices/version numbers,
56 returning less than, equal to or greater than zero if S1 is less than,
57 equal to or greater than S2 (for more info, see the texinfo doc).
58*/
59
60int
61__MHD_strverscmp (const char *s1, const char *s2)
62{
63 const unsigned char *p1 = (const unsigned char *) s1;
64 const unsigned char *p2 = (const unsigned char *) s2;
65 unsigned char c1, c2;
66 int state;
67 int diff;
68
69 /* Symbol(s) 0 [1-9] others (padding)
70 Transition (10) 0 (01) d (00) x (11) - */
71 static const unsigned int next_state[] = {
72 /* state x d 0 - */
73 /* S_N */ S_N, S_I, S_Z, S_N,
74 /* S_I */ S_N, S_I, S_I, S_I,
75 /* S_F */ S_N, S_F, S_F, S_F,
76 /* S_Z */ S_N, S_F, S_Z, S_Z
77 };
78
79 static const int result_type[] = {
80 /* state x/x x/d x/0 x/- d/x d/d d/0 d/-
81 0/x 0/d 0/0 0/- -/x -/d -/0 -/- */
82
83 /* S_N */ CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
84 CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
85 /* S_I */ CMP, -1, -1, CMP, 1, LEN, LEN, CMP,
86 1, LEN, LEN, CMP, CMP, CMP, CMP, CMP,
87 /* S_F */ CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
88 CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
89 /* S_Z */ CMP, 1, 1, CMP, -1, CMP, CMP, CMP,
90 -1, CMP, CMP, CMP
91 };
92
93 if (p1 == p2)
94 return 0;
95
96 c1 = *p1++;
97 c2 = *p2++;
98 /* Hint: '0' is a digit too. */
99 state = S_N | ((c1 == '0') + (ISDIGIT (c1) != 0));
100
101 while ((diff = c1 - c2) == 0 && c1 != '\0')
102 {
103 state = next_state[state];
104 c1 = *p1++;
105 c2 = *p2++;
106 state |= (c1 == '0') + (ISDIGIT (c1) != 0);
107 }
108
109 state = result_type[state << 2 | ((c2 == '0') + (ISDIGIT (c2) != 0))];
110
111 switch (state)
112 {
113 case CMP:
114 return diff;
115
116 case LEN:
117 while (ISDIGIT (*p1++))
118 if (!ISDIGIT (*p2++))
119 return 1;
120
121 return ISDIGIT (*p2) ? -1 : diff;
122
123 default:
124 return state;
125 }
126}
127
128#ifdef weak_alias
129weak_alias (__MHD_strverscmp, MHD_strverscmp)
130#endif