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