1 /*************************************************
2 *      Perl-Compatible Regular Expressions       *
3 *************************************************/
4 
5 /* PCRE is a library of functions to support regular expressions whose syntax
6 and semantics are as close as possible to those of the Perl 5 language.
7 
8                        Written by Philip Hazel
9            Copyright (c) 1997-2014 University of Cambridge
10 
11 -----------------------------------------------------------------------------
12 Redistribution and use in source and binary forms, with or without
13 modification, are permitted provided that the following conditions are met:
14 
15     * Redistributions of source code must retain the above copyright notice,
16       this list of conditions and the following disclaimer.
17 
18     * Redistributions in binary form must reproduce the above copyright
19       notice, this list of conditions and the following disclaimer in the
20       documentation and/or other materials provided with the distribution.
21 
22     * Neither the name of the University of Cambridge nor the names of its
23       contributors may be used to endorse or promote products derived from
24       this software without specific prior written permission.
25 
26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 POSSIBILITY OF SUCH DAMAGE.
37 -----------------------------------------------------------------------------
38 */
39 
40 
41 /* This module contains internal functions for comparing and finding the length
42 of strings for different data item sizes. */
43 
44 
45 #ifdef HAVE_CONFIG_H
46 #include "config.h"
47 #endif
48 
49 #include "pcre_internal.h"
50 
51 #ifndef COMPILE_PCRE8
52 
53 /*************************************************
54 *           Compare string utilities             *
55 *************************************************/
56 
57 /* The following two functions compares two strings. Basically a strcmp
58 for non 8 bit characters.
59 
60 Arguments:
61   str1        first string
62   str2        second string
63 
64 Returns:      0 if both string are equal (like strcmp), 1 otherwise
65 */
66 
67 int
PRIV(strcmp_uc_uc)68 PRIV(strcmp_uc_uc)(const pcre_uchar *str1, const pcre_uchar *str2)
69 {
70 pcre_uchar c1;
71 pcre_uchar c2;
72 
73 while (*str1 != '\0' || *str2 != '\0')
74   {
75   c1 = *str1++;
76   c2 = *str2++;
77   if (c1 != c2)
78     return ((c1 > c2) << 1) - 1;
79   }
80 /* Both length and characters must be equal. */
81 return 0;
82 }
83 
84 #ifdef COMPILE_PCRE32
85 
86 int
PRIV(strcmp_uc_uc_utf)87 PRIV(strcmp_uc_uc_utf)(const pcre_uchar *str1, const pcre_uchar *str2)
88 {
89 pcre_uchar c1;
90 pcre_uchar c2;
91 
92 while (*str1 != '\0' || *str2 != '\0')
93   {
94   c1 = UCHAR21INC(str1);
95   c2 = UCHAR21INC(str2);
96   if (c1 != c2)
97     return ((c1 > c2) << 1) - 1;
98   }
99 /* Both length and characters must be equal. */
100 return 0;
101 }
102 
103 #endif /* COMPILE_PCRE32 */
104 
105 int
PRIV(strcmp_uc_c8)106 PRIV(strcmp_uc_c8)(const pcre_uchar *str1, const char *str2)
107 {
108 const pcre_uint8 *ustr2 = (pcre_uint8 *)str2;
109 pcre_uchar c1;
110 pcre_uchar c2;
111 
112 while (*str1 != '\0' || *ustr2 != '\0')
113   {
114   c1 = *str1++;
115   c2 = (pcre_uchar)*ustr2++;
116   if (c1 != c2)
117     return ((c1 > c2) << 1) - 1;
118   }
119 /* Both length and characters must be equal. */
120 return 0;
121 }
122 
123 #ifdef COMPILE_PCRE32
124 
125 int
PRIV(strcmp_uc_c8_utf)126 PRIV(strcmp_uc_c8_utf)(const pcre_uchar *str1, const char *str2)
127 {
128 const pcre_uint8 *ustr2 = (pcre_uint8 *)str2;
129 pcre_uchar c1;
130 pcre_uchar c2;
131 
132 while (*str1 != '\0' || *ustr2 != '\0')
133   {
134   c1 = UCHAR21INC(str1);
135   c2 = (pcre_uchar)*ustr2++;
136   if (c1 != c2)
137     return ((c1 > c2) << 1) - 1;
138   }
139 /* Both length and characters must be equal. */
140 return 0;
141 }
142 
143 #endif /* COMPILE_PCRE32 */
144 
145 /* The following two functions compares two, fixed length
146 strings. Basically an strncmp for non 8 bit characters.
147 
148 Arguments:
149   str1        first string
150   str2        second string
151   num         size of the string
152 
153 Returns:      0 if both string are equal (like strcmp), 1 otherwise
154 */
155 
156 int
PRIV(strncmp_uc_uc)157 PRIV(strncmp_uc_uc)(const pcre_uchar *str1, const pcre_uchar *str2, unsigned int num)
158 {
159 pcre_uchar c1;
160 pcre_uchar c2;
161 
162 while (num-- > 0)
163   {
164   c1 = *str1++;
165   c2 = *str2++;
166   if (c1 != c2)
167     return ((c1 > c2) << 1) - 1;
168   }
169 /* Both length and characters must be equal. */
170 return 0;
171 }
172 
173 int
PRIV(strncmp_uc_c8)174 PRIV(strncmp_uc_c8)(const pcre_uchar *str1, const char *str2, unsigned int num)
175 {
176 const pcre_uint8 *ustr2 = (pcre_uint8 *)str2;
177 pcre_uchar c1;
178 pcre_uchar c2;
179 
180 while (num-- > 0)
181   {
182   c1 = *str1++;
183   c2 = (pcre_uchar)*ustr2++;
184   if (c1 != c2)
185     return ((c1 > c2) << 1) - 1;
186   }
187 /* Both length and characters must be equal. */
188 return 0;
189 }
190 
191 /* The following function returns with the length of
192 a zero terminated string. Basically an strlen for non 8 bit characters.
193 
194 Arguments:
195   str         string
196 
197 Returns:      length of the string
198 */
199 
200 unsigned int
PRIV(strlen_uc)201 PRIV(strlen_uc)(const pcre_uchar *str)
202 {
203 unsigned int len = 0;
204 while (*str++ != 0)
205   len++;
206 return len;
207 }
208 
209 #endif /* !COMPILE_PCRE8 */
210 
211 /* End of pcre_string_utils.c */
212