1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1985-2011 AT&T Intellectual Property *
5 * and is licensed under the *
6 * Eclipse Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.eclipse.org/org/documents/epl-v10.html *
11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) *
12 * *
13 * Information and Software Systems Research *
14 * AT&T Research *
15 * Florham Park NJ *
16 * *
17 * Glenn Fowler <gsf@research.att.com> *
18 * David Korn <dgk@research.att.com> *
19 * Phong Vo <kpv@research.att.com> *
20 * *
21 ***********************************************************************/
22 #pragma prototyped
23 /*
24 * Glenn Fowler
25 * AT&T Research
26 */
27
28 #include <ast.h>
29 #include <ccode.h>
30 #include <ctype.h>
31
32 #if CC_NATIVE == CC_ASCII
33 #define MAP(m,c) (c)
34 #else
35 #define MAP(m,c) m[c]
36 #endif
37
38 /*
39 * return a pointer to the isalpha() identifier matching
40 * name in the CC_ASCII sorted tab of num elements of
41 * size siz where the first member of each
42 * element is a char*
43 *
44 * [xxx] brackets optional identifier characters
45 * * starts optional identifier characters
46 *
47 * 0 returned if name not found
48 * otherwise if next!=0 then it points to the next
49 * unmatched char in name
50 */
51
52 void*
strpsearch(const void * tab,size_t num,size_t siz,const char * name,char ** next)53 strpsearch(const void* tab, size_t num, size_t siz, const char* name, char** next)
54 {
55 register char* lo = (char*)tab;
56 register char* hi = lo + (num - 1) * siz;
57 register char* mid;
58 #if CC_NATIVE != CC_ASCII
59 register unsigned char* m;
60 #endif
61 register unsigned char* s;
62 register unsigned char* t;
63 register int c;
64 register int v;
65 int sequential = 0;
66
67 #if CC_NATIVE != CC_ASCII
68 m = ccmap(CC_NATIVE, CC_ASCII);
69 #endif
70 c = MAP(m, *((unsigned char*)name));
71 while (lo <= hi)
72 {
73 mid = lo + (sequential ? 0 : (((hi - lo) / siz) / 2) * siz);
74 if (!(v = c - MAP(m, *(s = *((unsigned char**)mid)))) || *s == '[' && !(v = c - MAP(m, *++s)) && (v = 1))
75 {
76 t = (unsigned char*)name;
77 for (;;)
78 {
79 if (!v && (*s == '[' || *s == '*'))
80 {
81 v = 1;
82 s++;
83 }
84 else if (v && *s == ']')
85 {
86 v = 0;
87 s++;
88 }
89 else if (!isalpha(*t))
90 {
91 if (v || !*s)
92 {
93 if (next)
94 *next = (char*)t;
95 return (void*)mid;
96 }
97 if (!sequential)
98 {
99 while ((mid -= siz) >= lo && (s = *((unsigned char**)mid)) && ((c == MAP(m, *s)) || *s == '[' && c == MAP(m, *(s + 1))));
100 sequential = 1;
101 }
102 v = 1;
103 break;
104 }
105 else if (*t != *s)
106 {
107 v = MAP(m, *t) - MAP(m, *s);
108 break;
109 }
110 else
111 {
112 t++;
113 s++;
114 }
115 }
116 }
117 else if (sequential)
118 break;
119 if (v > 0)
120 lo = mid + siz;
121 else
122 hi = mid - siz;
123 }
124 return 0;
125 }
126