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utf.c (3014B)
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1 /* MIT/X Consortium Copyright (c) 2012 Connor Lane Smith <[email protected]>
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining…
4 * copy of this software and associated documentation files (the "Softwa…
5 * to deal in the Software without restriction, including without limita…
6 * the rights to use, copy, modify, merge, publish, distribute, sublicen…
7 * and/or sell copies of the Software, and to permit persons to whom the
8 * Software is furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be includ…
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRE…
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILI…
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SH…
16 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR …
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISI…
18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
19 * DEALINGS IN THE SOFTWARE.
20 */
21 #include <string.h>
22 #include "../utf.h"
23
24 char *
25 utfecpy(char *to, char *end, const char *from)
26 {
27 Rune r = Runeerror;
28 size_t i, n;
29
30 /* seek through to find final full rune */
31 for(i = 0; r != '\0' && (n = charntorune(&r, &from[i], end - &to…
32 ;
33 memcpy(to, from, i); /* copy over bytes up to this rune */
34
35 if(i > 0 && r != '\0')
36 to[i] = '\0'; /* terminate if unterminated */
37 return &to[i];
38 }
39
40 size_t
41 utflen(const char *s)
42 {
43 const char *p = s;
44 size_t i;
45 Rune r;
46
47 for(i = 0; *p != '\0'; i++)
48 p += chartorune(&r, p);
49 return i;
50 }
51
52 size_t
53 utfnlen(const char *s, size_t len)
54 {
55 const char *p = s;
56 size_t i;
57 Rune r;
58 int n;
59
60 for(i = 0; (n = charntorune(&r, p, len-(p-s))) && r != '\0'; i++)
61 p += n;
62 return i;
63 }
64
65 size_t
66 utfmemlen(const char *s, size_t len)
67 {
68 const char *p = s;
69 size_t i;
70 Rune r;
71 int n;
72
73 for(i = 0; (n = charntorune(&r, p, len-(p-s))); i++)
74 p += n;
75 return i;
76 }
77
78 char *
79 utfrune(const char *s, Rune r)
80 {
81 if(r < Runeself) {
82 return strchr(s, r);
83 }
84 else if(r == Runeerror) {
85 Rune r0;
86 int n;
87
88 for(; *s != '\0'; s += n) {
89 n = chartorune(&r0, s);
90 if(r == r0)
91 return (char *)s;
92 }
93 }
94 else {
95 char buf[UTFmax+1];
96 int n;
97
98 if(!(n = runetochar(buf, &r)))
99 return NULL;
100 buf[n] = '\0';
101 return strstr(s, buf);
102 }
103 return NULL;
104 }
105
106 char *
107 utfrrune(const char *s, Rune r)
108 {
109 const char *p = NULL;
110 Rune r0;
111 int n;
112
113 if(r < Runeself)
114 return strrchr(s, r);
115
116 for(; *s != '\0'; s += n) {
117 n = chartorune(&r0, s);
118 if(r == r0)
119 p = s;
120 }
121 return (char *)p;
122 }
123
124 char *
125 utfutf(const char *s, const char *t)
126 {
127 const char *p, *q;
128 Rune r0, r1, r2;
129 int n, m;
130
131 for(chartorune(&r0, t); (s = utfrune(s, r0)); s++) {
132 for(p = s, q = t; *q && *p; p += n, q += m) {
133 n = chartorune(&r1, p);
134 m = chartorune(&r2, q);
135 if(r1 != r2)
136 break;
137 }
138 if(!*q)
139 return (char *)s;
140 }
141 return NULL;
142 }
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