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 Original API code Copyright (c) 1997-2012 University of Cambridge
10 New API code Copyright (c) 2016 University of Cambridge
11
12 -----------------------------------------------------------------------------
13 Redistribution and use in source and binary forms, with or without
14 modification, are permitted provided that the following conditions are met:
15
16 * Redistributions of source code must retain the above copyright notice,
17 this list of conditions and the following disclaimer.
18
19 * Redistributions in binary form must reproduce the above copyright
20 notice, this list of conditions and the following disclaimer in the
21 documentation and/or other materials provided with the distribution.
22
23 * Neither the name of the University of Cambridge nor the names of its
24 contributors may be used to endorse or promote products derived from
25 this software without specific prior written permission.
26
27 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
28 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
31 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 POSSIBILITY OF SUCH DAMAGE.
38 -----------------------------------------------------------------------------
39 */
40
41 /* This module contains internal functions for comparing and finding the length
42 of strings. These are used instead of strcmp() etc because the standard
43 functions work only on 8-bit data. */
44
45
46 #ifdef HAVE_CONFIG_H
47 #include "config.h"
48 #endif
49
50 #include "pcre2_internal.h"
51
52
53 /*************************************************
54 * Compare two zero-terminated PCRE2 strings *
55 *************************************************/
56
57 /*
58 Arguments:
59 str1 first string
60 str2 second string
61
62 Returns: 0, 1, or -1
63 */
64
65 int
PRIV(strcmp)66 PRIV(strcmp)(PCRE2_SPTR str1, PCRE2_SPTR str2)
67 {
68 PCRE2_UCHAR c1, c2;
69 while (*str1 != '\0' || *str2 != '\0')
70 {
71 c1 = *str1++;
72 c2 = *str2++;
73 if (c1 != c2) return ((c1 > c2) << 1) - 1;
74 }
75 return 0;
76 }
77
78
79 /*************************************************
80 * Compare zero-terminated PCRE2 & 8-bit strings *
81 *************************************************/
82
83 /* As the 8-bit string is almost always a literal, its type is specified as
84 const char *.
85
86 Arguments:
87 str1 first string
88 str2 second string
89
90 Returns: 0, 1, or -1
91 */
92
93 int
PRIV(strcmp_c8)94 PRIV(strcmp_c8)(PCRE2_SPTR str1, const char *str2)
95 {
96 PCRE2_UCHAR c1, c2;
97 while (*str1 != '\0' || *str2 != '\0')
98 {
99 c1 = *str1++;
100 c2 = *str2++;
101 if (c1 != c2) return ((c1 > c2) << 1) - 1;
102 }
103 return 0;
104 }
105
106
107 /*************************************************
108 * Compare two PCRE2 strings, given a length *
109 *************************************************/
110
111 /*
112 Arguments:
113 str1 first string
114 str2 second string
115 len the length
116
117 Returns: 0, 1, or -1
118 */
119
120 int
PRIV(strncmp)121 PRIV(strncmp)(PCRE2_SPTR str1, PCRE2_SPTR str2, size_t len)
122 {
123 PCRE2_UCHAR c1, c2;
124 for (; len > 0; len--)
125 {
126 c1 = *str1++;
127 c2 = *str2++;
128 if (c1 != c2) return ((c1 > c2) << 1) - 1;
129 }
130 return 0;
131 }
132
133
134 /*************************************************
135 * Compare PCRE2 string to 8-bit string by length *
136 *************************************************/
137
138 /* As the 8-bit string is almost always a literal, its type is specified as
139 const char *.
140
141 Arguments:
142 str1 first string
143 str2 second string
144 len the length
145
146 Returns: 0, 1, or -1
147 */
148
149 int
PRIV(strncmp_c8)150 PRIV(strncmp_c8)(PCRE2_SPTR str1, const char *str2, size_t len)
151 {
152 PCRE2_UCHAR c1, c2;
153 for (; len > 0; len--)
154 {
155 c1 = *str1++;
156 c2 = *str2++;
157 if (c1 != c2) return ((c1 > c2) << 1) - 1;
158 }
159 return 0;
160 }
161
162
163 /*************************************************
164 * Find the length of a PCRE2 string *
165 *************************************************/
166
167 /*
168 Argument: the string
169 Returns: the length
170 */
171
172 PCRE2_SIZE
PRIV(strlen)173 PRIV(strlen)(PCRE2_SPTR str)
174 {
175 PCRE2_SIZE c = 0;
176 while (*str++ != 0) c++;
177 return c;
178 }
179
180
181 /*************************************************
182 * Copy 8-bit 0-terminated string to PCRE2 string *
183 *************************************************/
184
185 /* Arguments:
186 str1 buffer to receive the string
187 str2 8-bit string to be copied
188
189 Returns: the number of code units used (excluding trailing zero)
190 */
191
192 PCRE2_SIZE
PRIV(strcpy_c8)193 PRIV(strcpy_c8)(PCRE2_UCHAR *str1, const char *str2)
194 {
195 PCRE2_UCHAR *t = str1;
196 while (*str2 != 0) *t++ = *str2++;
197 *t = 0;
198 return t - str1;
199 }
200
201 /* End of pcre2_string_utils.c */
202