2
* the outer shell of regexec()
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.
18
/* for use in asserts */
21
/* macros for manipulating states, small version */
23
#define states1 long /* for later use in regexec() decision. Ensure Win64 definition is correct.*/
24
#define CLEAR(v) ((v) = 0)
25
#define SET0(v, n) ((v) &= ~((states) 1 << (n)))
26
#define SET1(v, n) ((v) |= (states) 1 << (n))
27
#define ISSET(v, n) ((v) & ((states) 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 long /* Changed from int by Monty */
35
#define INIT(o, n) ((o) = (unsigned states)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 states)(src)&(here)) << (n))
41
#define BACK(dst, src, n) ((dst) |= ((unsigned states)(src)&(here)) >> (n))
42
#define ISSETBACK(v, n) ((v) & ((unsigned states)here >> (n)))
44
#define SNAMES /* engine.c looks after details */
69
/* macros for manipulating states, large version */
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; char *space
78
#define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \
79
if ((m)->space == NULL) return(REG_ESPACE); \
81
#define STATETEARDOWN(m) { free((m)->space); }
82
#define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates])
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)])
93
#define LNAMES /* flag */
98
- regexec - interface for matching
99
= extern 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
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.
112
int /* 0 success, REG_NOMATCH failure */
113
my_regexec(preg, str, nmatch, pmatch, eflags)
114
const my_regex_t *preg;
117
my_regmatch_t pmatch[];
120
register struct re_guts *g = preg->re_g;
122
# define GOODFLAGS(f) (f)
124
# define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND))
127
if (preg->re_magic != MAGIC1 || g->magic != MAGIC2)
129
assert(!(g->iflags&BAD));
130
if (g->iflags&BAD) /* backstop for no-debug case */
132
eflags = GOODFLAGS(eflags);
134
if ((size_t) g->nstates <= CHAR_BIT*sizeof(states1) &&
136
return(smatcher(preg->charset, g, (char *)str, nmatch, pmatch, eflags));
138
return(lmatcher(preg->charset, g, (char *)str, nmatch, pmatch, eflags));