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1 /*
2 * the outer shell of regexec()
3 *
4 * This file includes engine.c *twice*, after muchos fiddling with the
5 * macros that code uses. This lets the same code operate on two different
6 * representations for state sets.
7 */
8 #if defined(__MWERKS__) && !defined(__MACH__)
9 typedef long off_t ;
10 #else
11 #include <sys/types.h>
12 #endif
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <string.h>
16 #include <limits.h>
17 #include <ctype.h>
18 #include "regex.h"
19
20 #include "utils.h"
21 #include "regex2.h"
22
23 #ifdef REDEBUG
24 static int nope = 0; /* for use in asserts; shuts lint up */
25 #endif
26
27 /* macros for manipulating states, small version */
28 #define states unsigned
29 #define states1 unsigned /* for later use in regexec() decision */
30 #define CLEAR(v) ((v) = 0)
31 #define SET0(v, n) ((v) &= ~((unsigned)1 << (n)))
32 #define SET1(v, n) ((v) |= (unsigned)1 << (n))
33 #define ISSET(v, n) ((v) & ((unsigned)1 << (n)))
34 #define ASSIGN(d, s) ((d) = (s))
35 #define EQ(a, b) ((a) == (b))
36 #define STATEVARS int dummy /* dummy version */
37 #define STATESETUP(m, n) /* nothing */
38 #define STATETEARDOWN(m) /* nothing */
39 #define SETUP(v) ((v) = 0)
40 #define onestate unsigned
41 #define INIT(o, n) ((o) = (unsigned)1 << (n))
42 #define INC(o) ((o) <<= 1)
43 #define ISSTATEIN(v, o) ((v) & (o))
44 /* some abbreviations; note that some of these know variable names! */
45 /* do "if I'm here, I can also be there" etc without branches */
46 #define FWD(dst, src, n) ((dst) |= ((unsigned)(src)&(here)) << (n))
47 #define BACK(dst, src, n) ((dst) |= ((unsigned)(src)&(here)) >> (n))
48 #define ISSETBACK(v, n) ((v) & ((unsigned)here >> (n)))
49 /* function names */
50 #define SNAMES /* engine.c looks after details */
51
52 #include "engine.c"
53
54 /* now undo things */
55 #undef states
56 #undef CLEAR
57 #undef SET0
58 #undef SET1
59 #undef ISSET
60 #undef ASSIGN
61 #undef EQ
62 #undef STATEVARS
63 #undef STATESETUP
64 #undef STATETEARDOWN
65 #undef SETUP
66 #undef onestate
67 #undef INIT
68 #undef INC
69 #undef ISSTATEIN
70 #undef FWD
71 #undef BACK
72 #undef ISSETBACK
73 #undef SNAMES
74
75 /* macros for manipulating states, large version */
76 #define states char *
77 #define CLEAR(v) memset(v, 0, m->g->nstates)
78 #define SET0(v, n) ((v)[n] = 0)
79 #define SET1(v, n) ((v)[n] = 1)
80 #define ISSET(v, n) ((v)[n])
81 #define ASSIGN(d, s) memcpy(d, s, m->g->nstates)
82 #define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0)
83 #define STATEVARS int vn; char *space
84 #define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \
85 if ((m)->space == NULL) return(REG_ESPACE); \
86 (m)->vn = 0; }
87 #define STATETEARDOWN(m) { free((m)->space); }
88 #define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates])
89 #define onestate int
90 #define INIT(o, n) ((o) = (n))
91 #define INC(o) ((o)++)
92 #define ISSTATEIN(v, o) ((v)[o])
93 /* some abbreviations; note that some of these know variable names! */
94 /* do "if I'm here, I can also be there" etc without branches */
95 #define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here])
96 #define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here])
97 #define ISSETBACK(v, n) ((v)[here - (n)])
98 /* function names */
99 #define LNAMES /* flag */
100
101 #include "engine.c"
102
103 /*
104 - regexec - interface for matching
105 = extern int regexec(const regex_t *, const char *, size_t, \
106 = regmatch_t [], int);
107 = #define REG_NOTBOL 00001
108 = #define REG_NOTEOL 00002
109 = #define REG_STARTEND 00004
110 = #define REG_TRACE 00400 // tracing of execution
111 = #define REG_LARGE 01000 // force large representation
112 = #define REG_BACKR 02000 // force use of backref code
113 *
114 * We put this here so we can exploit knowledge of the state representation
115 * when choosing which matcher to call. Also, by this point the matchers
116 * have been prototyped.
117 */
118 int /* 0 success, REG_NOMATCH failure */
119 regexec(preg, string, nmatch, pmatch, eflags)
120 const regex_t *preg;
121 const char *string;
122 size_t nmatch;
123 regmatch_t pmatch[];
124 int eflags;
125 {
126 register struct re_guts *g = preg->re_g;
127 #ifdef REDEBUG
128 # define GOODFLAGS(f) (f)
129 #else
130 # define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND))
131 #endif
132
133 if (preg->re_magic != MAGIC1 || g->magic != MAGIC2)
134 return(REG_BADPAT);
135 assert(!(g->iflags&BAD));
136 if (g->iflags&BAD) /* backstop for no-debug case */
137 return(REG_BADPAT);
138 eflags = GOODFLAGS(eflags);
139
140 if (g->nstates <= CHAR_BIT*sizeof(states1) && !(eflags&REG_LARGE))
141 return(smatcher(g, (char *)string, nmatch, pmatch, eflags));
142 else
143 return(lmatcher(g, (char *)string, nmatch, pmatch, eflags));
144 }