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
52void*
53strpsearch(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