Annotation of src/lib/libc/regex/regexec.c, Revision 1.1.1.1
1.1.1.1 ! cgd 1: /*-
! 2: * Copyright (c) 1992, 1993, 1994 Henry Spencer.
! 3: * Copyright (c) 1992, 1993, 1994
! 4: * The Regents of the University of California. All rights reserved.
! 5: *
! 6: * This code is derived from software contributed to Berkeley by
! 7: * Henry Spencer.
! 8: *
! 9: * Redistribution and use in source and binary forms, with or without
! 10: * modification, are permitted provided that the following conditions
! 11: * are met:
! 12: * 1. Redistributions of source code must retain the above copyright
! 13: * notice, this list of conditions and the following disclaimer.
! 14: * 2. Redistributions in binary form must reproduce the above copyright
! 15: * notice, this list of conditions and the following disclaimer in the
! 16: * documentation and/or other materials provided with the distribution.
! 17: * 3. All advertising materials mentioning features or use of this software
! 18: * must display the following acknowledgement:
! 19: * This product includes software developed by the University of
! 20: * California, Berkeley and its contributors.
! 21: * 4. Neither the name of the University nor the names of its contributors
! 22: * may be used to endorse or promote products derived from this software
! 23: * without specific prior written permission.
! 24: *
! 25: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 26: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 27: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 28: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 29: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 30: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 31: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 32: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 33: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 34: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 35: * SUCH DAMAGE.
! 36: *
! 37: * @(#)regexec.c 8.3 (Berkeley) 3/20/94
! 38: */
! 39:
! 40: #if defined(LIBC_SCCS) && !defined(lint)
! 41: static char sccsid[] = "@(#)regexec.c 8.3 (Berkeley) 3/20/94";
! 42: #endif /* LIBC_SCCS and not lint */
! 43:
1.1 jtc 44: /*
45: * the outer shell of regexec()
46: *
47: * This file includes engine.c *twice*, after muchos fiddling with the
48: * macros that code uses. This lets the same code operate on two different
49: * representations for state sets.
50: */
51: #include <sys/types.h>
52: #include <stdio.h>
53: #include <stdlib.h>
54: #include <string.h>
55: #include <limits.h>
56: #include <ctype.h>
57: #include <regex.h>
58:
59: #include "utils.h"
60: #include "regex2.h"
61:
62: static int nope = 0; /* for use in asserts; shuts lint up */
63:
64: /* macros for manipulating states, small version */
65: #define states long
66: #define states1 states /* for later use in regexec() decision */
67: #define CLEAR(v) ((v) = 0)
68: #define SET0(v, n) ((v) &= ~(1 << (n)))
69: #define SET1(v, n) ((v) |= 1 << (n))
70: #define ISSET(v, n) ((v) & (1 << (n)))
71: #define ASSIGN(d, s) ((d) = (s))
72: #define EQ(a, b) ((a) == (b))
73: #define STATEVARS int dummy /* dummy version */
74: #define STATESETUP(m, n) /* nothing */
75: #define STATETEARDOWN(m) /* nothing */
76: #define SETUP(v) ((v) = 0)
77: #define onestate int
78: #define INIT(o, n) ((o) = (unsigned)1 << (n))
79: #define INC(o) ((o) <<= 1)
80: #define ISSTATEIN(v, o) ((v) & (o))
81: /* some abbreviations; note that some of these know variable names! */
82: /* do "if I'm here, I can also be there" etc without branches */
83: #define FWD(dst, src, n) ((dst) |= ((unsigned)(src)&(here)) << (n))
84: #define BACK(dst, src, n) ((dst) |= ((unsigned)(src)&(here)) >> (n))
85: #define ISSETBACK(v, n) ((v) & ((unsigned)here >> (n)))
86: /* function names */
87: #define SNAMES /* engine.c looks after details */
88:
89: #include "engine.c"
90:
91: /* now undo things */
92: #undef states
93: #undef CLEAR
94: #undef SET0
95: #undef SET1
96: #undef ISSET
97: #undef ASSIGN
98: #undef EQ
99: #undef STATEVARS
100: #undef STATESETUP
101: #undef STATETEARDOWN
102: #undef SETUP
103: #undef onestate
104: #undef INIT
105: #undef INC
106: #undef ISSTATEIN
107: #undef FWD
108: #undef BACK
109: #undef ISSETBACK
110: #undef SNAMES
111:
112: /* macros for manipulating states, large version */
113: #define states char *
114: #define CLEAR(v) memset(v, 0, m->g->nstates)
115: #define SET0(v, n) ((v)[n] = 0)
116: #define SET1(v, n) ((v)[n] = 1)
117: #define ISSET(v, n) ((v)[n])
118: #define ASSIGN(d, s) memcpy(d, s, m->g->nstates)
119: #define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0)
120: #define STATEVARS int vn; char *space
121: #define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \
122: if ((m)->space == NULL) return(REG_ESPACE); \
123: (m)->vn = 0; }
124: #define STATETEARDOWN(m) { free((m)->space); }
125: #define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates])
126: #define onestate int
127: #define INIT(o, n) ((o) = (n))
128: #define INC(o) ((o)++)
129: #define ISSTATEIN(v, o) ((v)[o])
130: /* some abbreviations; note that some of these know variable names! */
131: /* do "if I'm here, I can also be there" etc without branches */
132: #define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here])
133: #define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here])
134: #define ISSETBACK(v, n) ((v)[here - (n)])
135: /* function names */
136: #define LNAMES /* flag */
137:
138: #include "engine.c"
139:
140: /*
141: - regexec - interface for matching
1.1.1.1 ! cgd 142: = extern int regexec(const regex_t *, const char *, size_t, \
! 143: = regmatch_t [], int);
1.1 jtc 144: = #define REG_NOTBOL 00001
145: = #define REG_NOTEOL 00002
146: = #define REG_STARTEND 00004
147: = #define REG_TRACE 00400 // tracing of execution
148: = #define REG_LARGE 01000 // force large representation
149: = #define REG_BACKR 02000 // force use of backref code
150: *
151: * We put this here so we can exploit knowledge of the state representation
152: * when choosing which matcher to call. Also, by this point the matchers
153: * have been prototyped.
154: */
155: int /* 0 success, REG_NOMATCH failure */
156: regexec(preg, string, nmatch, pmatch, eflags)
157: const regex_t *preg;
158: const char *string;
159: size_t nmatch;
160: regmatch_t pmatch[];
161: int eflags;
162: {
163: register struct re_guts *g = preg->re_g;
164: #ifdef REDEBUG
165: # define GOODFLAGS(f) (f)
166: #else
167: # define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND))
168: #endif
169:
170: if (preg->re_magic != MAGIC1 || g->magic != MAGIC2)
171: return(REG_BADPAT);
172: assert(!(g->iflags&BAD));
173: if (g->iflags&BAD) /* backstop for no-debug case */
174: return(REG_BADPAT);
1.1.1.1 ! cgd 175: eflags = GOODFLAGS(eflags);
1.1 jtc 176:
177: if (g->nstates <= CHAR_BIT*sizeof(states1) && !(eflags®_LARGE))
178: return(smatcher(g, (char *)string, nmatch, pmatch, eflags));
179: else
180: return(lmatcher(g, (char *)string, nmatch, pmatch, eflags));
181: }
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