huwcampbell.com
Reactos
1/***
2*mbsnbicmp.c - Compare n bytes of strings, ignoring case (MBCS)
3*
4* Copyright (c) Microsoft Corporation. All rights reserved.
5*
6*Purpose:
7* Compare n bytes of strings, ignoring case (MBCS)
8*
9*******************************************************************************/
10#ifndef _MBCS
11 #error This file should only be compiled with _MBCS defined
12#endif
13
14#include <corecrt_internal_mbstring.h>
15#include <locale.h>
16#include <string.h>
17
18#pragma warning(disable:__WARNING_POTENTIAL_BUFFER_OVERFLOW_NULLTERMINATED) // 26018
19
20/***
21* _mbsnbicmp - Compare n bytes of strings, ignoring case (MBCS)
22*
23*Purpose:
24* Compares up to n bytes of two strings for ordinal order.
25* Strings are compared on a character basis, not a byte basis.
26* Case of characters is not considered.
27*
28*Entry:
29* unsigned char *s1, *s2 = strings to compare
30* size_t n = maximum number of bytes to compare
31*
32*Exit:
33* Returns <0 if s1 < s2
34* Returns 0 if s1 == s2
35* Returns >0 if s1 > s2
36* Returns _NLSCMPERROR is something went wrong
37*
38*Exceptions:
39* Input parameters are validated. Refer to the validation section of the function.
40*
41*******************************************************************************/
42
43int __cdecl _mbsnbicmp_l(
44 const unsigned char *s1,
45 const unsigned char *s2,
46 size_t n,
47 _locale_t plocinfo
48 )
49{
50 unsigned short c1, c2;
51 _LocaleUpdate _loc_update(plocinfo);
52
53 if (n==0)
54 return(0);
55
56 if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0)
57 return _strnicmp((const char *)s1, (const char *)s2, n);
58
59 /* validation section */
60 _VALIDATE_RETURN(s1 != nullptr, EINVAL, _NLSCMPERROR);
61 _VALIDATE_RETURN(s2 != nullptr, EINVAL, _NLSCMPERROR);
62
63 while (n--) {
64
65 c1 = *s1++;
66 if ( _ismbblead_l(c1, _loc_update.GetLocaleT()) )
67 {
68 if (n==0)
69 {
70 c1 = 0; /* 'naked' lead - end of string */
71 c2 = _ismbblead_l(*s2, _loc_update.GetLocaleT()) ? 0 : *s2;
72 goto test;
73 }
74 if (*s1 == '\0')
75 c1 = 0;
76 else {
77 c1 = ((c1<<8) | *s1++);
78
79 if ( ((c1 >= _MBUPPERLOW1_MT(_loc_update.GetLocaleT())) &&
80 (c1 <= _MBUPPERHIGH1_MT(_loc_update.GetLocaleT()))) )
81 c1 += _MBCASEDIFF1_MT(_loc_update.GetLocaleT());
82 else if ( ((c1 >= _MBUPPERLOW2_MT(_loc_update.GetLocaleT())) &&
83 (c1 <= _MBUPPERHIGH2_MT(_loc_update.GetLocaleT()))) )
84 c1 += _MBCASEDIFF2_MT(_loc_update.GetLocaleT());
85 }
86 }
87 else
88 c1 = _mbbtolower_l(c1, _loc_update.GetLocaleT());
89
90 c2 = *s2++;
91 if ( _ismbblead_l(c2, _loc_update.GetLocaleT()) )
92 {
93 if (n==0)
94 {
95 c2 = 0; /* 'naked' lead - end of string */
96 goto test;
97 }
98 n--;
99 if (*s2 == '\0')
100 c2 = 0;
101 else {
102 c2 = ((c2<<8) | *s2++);
103
104 if ( ((c2 >= _MBUPPERLOW1_MT(_loc_update.GetLocaleT())) &&
105 (c2 <= _MBUPPERHIGH1_MT(_loc_update.GetLocaleT()))) )
106 c2 += _MBCASEDIFF1_MT(_loc_update.GetLocaleT());
107 else if ( ((c2 >= _MBUPPERLOW2_MT(_loc_update.GetLocaleT())) &&
108 (c2 <= _MBUPPERHIGH2_MT(_loc_update.GetLocaleT()))) )
109 c2 += _MBCASEDIFF2_MT(_loc_update.GetLocaleT());
110 }
111 }
112 else
113 c2 = _mbbtolower_l(c2, _loc_update.GetLocaleT());
114
115test:
116 if (c1 != c2)
117 return( (c1 > c2) ? 1 : -1);
118
119 if (c1 == 0)
120 return(0);
121 }
122
123 return(0);
124}
125
126int (__cdecl _mbsnbicmp)(
127 const unsigned char *s1,
128 const unsigned char *s2,
129 size_t n
130 )
131{
132 return _mbsnbicmp_l(s1, s2, n, nullptr);
133}