OpenVAS Libraries
4.0+rc3.SVN
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00001 /* Definitions for data structures and routines for the regular 00002 expression library, version 0.12. 00003 00004 Copyright (C) 1985, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc. 00005 00006 This program is free software; you can redistribute it and/or modify 00007 it under the terms of the GNU General Public License as published by 00008 the Free Software Foundation, version 2. 00009 00010 This program is distributed in the hope that it will be useful, 00011 but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00013 GNU General Public License for more details. 00014 00015 You should have received a copy of the GNU General Public License 00016 along with this program; if not, write to the Free Software 00017 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ 00018 00019 #ifdef HAVE_REGEX_SUPPORT 00020 #include <regex.h> 00021 #else 00022 #ifndef __REGEXP_LIBRARY_H__ 00023 #define __REGEXP_LIBRARY_H__ 00024 00025 /* POSIX says that <sys/types.h> must be included (by the caller) before 00026 <regex.h>. */ 00027 00028 #include <sys/types.h> /* for size_t */ 00029 #ifdef VMS 00030 /* VMS doesn't have `size_t' in <sys/types.h>, even though POSIX says it 00031 should be there. */ 00032 #include <stddef.h> 00033 #endif 00034 00035 00036 /* The following bits are used to determine the regexp syntax we 00037 recognize. The set/not-set meanings are chosen so that Emacs syntax 00038 remains the value 0. The bits are given in alphabetical order, and 00039 the definitions shifted by one from the previous bit; thus, when we 00040 add or remove a bit, only one other definition need change. */ 00041 typedef unsigned reg_syntax_t; 00042 00043 /* If this bit is not set, then \ inside a bracket expression is literal. 00044 If set, then such a \ quotes the following character. */ 00045 #define RE_BACKSLASH_ESCAPE_IN_LISTS (1) 00046 00047 /* If this bit is not set, then + and ? are operators, and \+ and \? are 00048 literals. 00049 If set, then \+ and \? are operators and + and ? are literals. */ 00050 #define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1) 00051 00052 /* If this bit is set, then character classes are supported. They are: 00053 [:alpha:], [:upper:], [:lower:], [:digit:], [:alnum:], [:xdigit:], 00054 [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:]. 00055 If not set, then character classes are not supported. */ 00056 #define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1) 00057 00058 /* If this bit is set, then ^ and $ are always anchors (outside bracket 00059 expressions, of course). 00060 If this bit is not set, then it depends: 00061 ^ is an anchor if it is at the beginning of a regular 00062 expression or after an open-group or an alternation operator; 00063 $ is an anchor if it is at the end of a regular expression, or 00064 before a close-group or an alternation operator. 00065 00066 This bit could be (re)combined with RE_CONTEXT_INDEP_OPS, because 00067 POSIX draft 11.2 says that * etc. in leading positions is undefined. 00068 We already implemented a previous draft which made those constructs 00069 invalid, though, so we haven't changed the code back. */ 00070 #define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1) 00071 00072 /* If this bit is set, then special characters are always special 00073 regardless of where they are in the pattern. 00074 If this bit is not set, then special characters are special only in 00075 some contexts; otherwise they are ordinary. Specifically, 00076 * + ? and intervals are only special when not after the beginning, 00077 open-group, or alternation operator. */ 00078 #define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1) 00079 00080 /* If this bit is set, then *, +, ?, and { cannot be first in an re or 00081 immediately after an alternation or begin-group operator. */ 00082 #define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1) 00083 00084 /* If this bit is set, then . matches newline. 00085 If not set, then it doesn't. */ 00086 #define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1) 00087 00088 /* If this bit is set, then . doesn't match NUL. 00089 If not set, then it does. */ 00090 #define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1) 00091 00092 /* If this bit is set, nonmatching lists [^...] do not match newline. 00093 If not set, they do. */ 00094 #define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1) 00095 00096 /* If this bit is set, either \{...\} or {...} defines an 00097 interval, depending on RE_NO_BK_BRACES. 00098 If not set, \{, \}, {, and } are literals. */ 00099 #define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1) 00100 00101 /* If this bit is set, +, ? and | aren't recognized as operators. 00102 If not set, they are. */ 00103 #define RE_LIMITED_OPS (RE_INTERVALS << 1) 00104 00105 /* If this bit is set, newline is an alternation operator. 00106 If not set, newline is literal. */ 00107 #define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1) 00108 00109 /* If this bit is set, then `{...}' defines an interval, and \{ and \} 00110 are literals. 00111 If not set, then `\{...\}' defines an interval. */ 00112 #define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1) 00113 00114 /* If this bit is set, (...) defines a group, and \( and \) are literals. 00115 If not set, \(...\) defines a group, and ( and ) are literals. */ 00116 #define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1) 00117 00118 /* If this bit is set, then <digit> matches <digit>. 00119 If not set, then <digit> is a back-reference. */ 00120 #define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1) 00121 00122 /* If this bit is set, then | is an alternation operator, and \| is literal. 00123 If not set, then \| is an alternation operator, and | is literal. */ 00124 #define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1) 00125 00126 /* If this bit is set, then an ending range point collating higher 00127 than the starting range point, as in [z-a], is invalid. 00128 If not set, then when ending range point collates higher than the 00129 starting range point, the range is ignored. */ 00130 #define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1) 00131 00132 /* If this bit is set, then an unmatched ) is ordinary. 00133 If not set, then an unmatched ) is invalid. */ 00134 #define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_EMPTY_RANGES << 1) 00135 00136 /* This global variable defines the particular regexp syntax to use (for 00137 some interfaces). When a regexp is compiled, the syntax used is 00138 stored in the pattern buffer, so changing this does not affect 00139 already-compiled regexps. */ 00140 extern reg_syntax_t re_syntax_options; 00141 00142 /* Define combinations of the above bits for the standard possibilities. 00143 (The [[[ comments delimit what gets put into the Texinfo file, so 00144 don't delete them!) */ 00145 /* [[[begin syntaxes]]] */ 00146 #define RE_SYNTAX_EMACS 0 00147 00148 #define RE_SYNTAX_AWK \ 00149 (RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DOT_NOT_NULL \ 00150 | RE_NO_BK_PARENS | RE_NO_BK_REFS \ 00151 | RE_NO_BK_VBAR | RE_NO_EMPTY_RANGES \ 00152 | RE_UNMATCHED_RIGHT_PAREN_ORD) 00153 00154 #define RE_SYNTAX_POSIX_AWK \ 00155 (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS) 00156 00157 #define RE_SYNTAX_GREP \ 00158 (RE_BK_PLUS_QM | RE_CHAR_CLASSES \ 00159 | RE_HAT_LISTS_NOT_NEWLINE | RE_INTERVALS \ 00160 | RE_NEWLINE_ALT) 00161 00162 #define RE_SYNTAX_EGREP \ 00163 (RE_CHAR_CLASSES | RE_CONTEXT_INDEP_ANCHORS \ 00164 | RE_CONTEXT_INDEP_OPS | RE_HAT_LISTS_NOT_NEWLINE \ 00165 | RE_NEWLINE_ALT | RE_NO_BK_PARENS \ 00166 | RE_NO_BK_VBAR) 00167 00168 #define RE_SYNTAX_POSIX_EGREP \ 00169 (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES) 00170 00171 /* P1003.2/D11.2, section 4.20.7.1, lines 5078ff. */ 00172 #define RE_SYNTAX_ED RE_SYNTAX_POSIX_BASIC 00173 00174 #define RE_SYNTAX_SED RE_SYNTAX_POSIX_BASIC 00175 00176 /* Syntax bits common to both basic and extended POSIX regex syntax. */ 00177 #define _RE_SYNTAX_POSIX_COMMON \ 00178 (RE_CHAR_CLASSES | RE_DOT_NEWLINE | RE_DOT_NOT_NULL \ 00179 | RE_INTERVALS | RE_NO_EMPTY_RANGES) 00180 00181 #define RE_SYNTAX_POSIX_BASIC \ 00182 (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM) 00183 00184 /* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes 00185 RE_LIMITED_OPS, i.e., \? \+ \| are not recognized. Actually, this 00186 isn't minimal, since other operators, such as \`, aren't disabled. */ 00187 #define RE_SYNTAX_POSIX_MINIMAL_BASIC \ 00188 (_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS) 00189 00190 #define RE_SYNTAX_POSIX_EXTENDED \ 00191 (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \ 00192 | RE_CONTEXT_INDEP_OPS | RE_NO_BK_BRACES \ 00193 | RE_NO_BK_PARENS | RE_NO_BK_VBAR \ 00194 | RE_UNMATCHED_RIGHT_PAREN_ORD) 00195 00196 /* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INVALID_OPS 00197 replaces RE_CONTEXT_INDEP_OPS and RE_NO_BK_REFS is added. */ 00198 #define RE_SYNTAX_POSIX_MINIMAL_EXTENDED \ 00199 (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \ 00200 | RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES \ 00201 | RE_NO_BK_PARENS | RE_NO_BK_REFS \ 00202 | RE_NO_BK_VBAR | RE_UNMATCHED_RIGHT_PAREN_ORD) 00203 /* [[[end syntaxes]]] */ 00204 00205 /* Maximum number of duplicates an interval can allow. Some systems 00206 (erroneously) define this in other header files, but we want our 00207 value, so remove any previous define. */ 00208 #ifdef RE_DUP_MAX 00209 #undef RE_DUP_MAX 00210 #endif 00211 #define RE_DUP_MAX ((1 << 15) - 1) 00212 00213 00214 /* POSIX `cflags' bits (i.e., information for `regcomp'). */ 00215 00216 /* If this bit is set, then use extended regular expression syntax. 00217 If not set, then use basic regular expression syntax. */ 00218 #define REG_EXTENDED 1 00219 00220 /* If this bit is set, then ignore case when matching. 00221 If not set, then case is significant. */ 00222 #define REG_ICASE (REG_EXTENDED << 1) 00223 00224 /* If this bit is set, then anchors do not match at newline 00225 characters in the string. 00226 If not set, then anchors do match at newlines. */ 00227 #define REG_NEWLINE (REG_ICASE << 1) 00228 00229 /* If this bit is set, then report only success or fail in regexec. 00230 If not set, then returns differ between not matching and errors. */ 00231 #define REG_NOSUB (REG_NEWLINE << 1) 00232 00233 00234 /* POSIX `eflags' bits (i.e., information for regexec). */ 00235 00236 /* If this bit is set, then the beginning-of-line operator doesn't match 00237 the beginning of the string (presumably because it's not the 00238 beginning of a line). 00239 If not set, then the beginning-of-line operator does match the 00240 beginning of the string. */ 00241 #define REG_NOTBOL 1 00242 00243 /* Like REG_NOTBOL, except for the end-of-line. */ 00244 #define REG_NOTEOL (1 << 1) 00245 00246 00247 /* If any error codes are removed, changed, or added, update the 00248 `re_error_msg' table in regex.c. */ 00249 typedef enum 00250 { 00251 REG_NOERROR = 0, /* Success. */ 00252 REG_NOMATCH, /* Didn't find a match (for regexec). */ 00253 00254 /* POSIX regcomp return error codes. (In the order listed in the 00255 standard.) */ 00256 REG_BADPAT, /* Invalid pattern. */ 00257 REG_ECOLLATE, /* Not implemented. */ 00258 REG_ECTYPE, /* Invalid character class name. */ 00259 REG_EESCAPE, /* Trailing backslash. */ 00260 REG_ESUBREG, /* Invalid back reference. */ 00261 REG_EBRACK, /* Unmatched left bracket. */ 00262 REG_EPAREN, /* Parenthesis imbalance. */ 00263 REG_EBRACE, /* Unmatched \{. */ 00264 REG_BADBR, /* Invalid contents of \{\}. */ 00265 REG_ERANGE, /* Invalid range end. */ 00266 REG_ESPACE, /* Ran out of memory. */ 00267 REG_BADRPT, /* No preceding re for repetition op. */ 00268 00269 /* Error codes we've added. */ 00270 REG_EEND, /* Premature end. */ 00271 REG_ESIZE, /* Compiled pattern bigger than 2^16 bytes. */ 00272 REG_ERPAREN /* Unmatched ) or \); not returned from regcomp. */ 00273 } reg_errcode_t; 00274 00275 /* This data structure represents a compiled pattern. Before calling 00276 the pattern compiler, the fields `buffer', `allocated', `fastmap', 00277 `translate', and `no_sub' can be set. After the pattern has been 00278 compiled, the `re_nsub' field is available. All other fields are 00279 private to the regex routines. */ 00280 00281 struct re_pattern_buffer 00282 { 00283 /* [[[begin pattern_buffer]]] */ 00284 /* Space that holds the compiled pattern. It is declared as 00285 `unsigned char *' because its elements are 00286 sometimes used as array indexes. */ 00287 unsigned char *buffer; 00288 00289 /* Number of bytes to which `buffer' points. */ 00290 unsigned long allocated; 00291 00292 /* Number of bytes actually used in `buffer'. */ 00293 unsigned long used; 00294 00295 /* Syntax setting with which the pattern was compiled. */ 00296 reg_syntax_t syntax; 00297 00298 /* Pointer to a fastmap, if any, otherwise zero. re_search uses 00299 the fastmap, if there is one, to skip over impossible 00300 starting points for matches. */ 00301 char *fastmap; 00302 00303 /* Either a translate table to apply to all characters before 00304 comparing them, or zero for no translation. The translation 00305 is applied to a pattern when it is compiled and to a string 00306 when it is matched. */ 00307 char *translate; 00308 00309 /* Number of subexpressions found by the compiler. */ 00310 size_t re_nsub; 00311 00312 /* Zero if this pattern cannot match the empty string, one else. 00313 Well, in truth it's used only in `re_search_2', to see 00314 whether or not we should use the fastmap, so we don't set 00315 this absolutely perfectly; see `re_compile_fastmap' (the 00316 `duplicate' case). */ 00317 unsigned can_be_null : 1; 00318 00319 /* If REGS_UNALLOCATED, allocate space in the `regs' structure 00320 for `max (RE_NREGS, re_nsub + 1)' groups. 00321 If REGS_REALLOCATE, reallocate space if necessary. 00322 If REGS_FIXED, use what's there. */ 00323 #define REGS_UNALLOCATED 0 00324 #define REGS_REALLOCATE 1 00325 #define REGS_FIXED 2 00326 unsigned regs_allocated : 2; 00327 00328 /* Set to zero when `regex_compile' compiles a pattern; set to one 00329 by `re_compile_fastmap' if it updates the fastmap. */ 00330 unsigned fastmap_accurate : 1; 00331 00332 /* If set, `re_match_2' does not return information about 00333 subexpressions. */ 00334 unsigned no_sub : 1; 00335 00336 /* If set, a beginning-of-line anchor doesn't match at the 00337 beginning of the string. */ 00338 unsigned not_bol : 1; 00339 00340 /* Similarly for an end-of-line anchor. */ 00341 unsigned not_eol : 1; 00342 00343 /* If true, an anchor at a newline matches. */ 00344 unsigned newline_anchor : 1; 00345 00346 char * orig; 00347 /* [[[end pattern_buffer]]] */ 00348 }; 00349 00350 typedef struct re_pattern_buffer regex_t; 00351 00352 00353 /* search.c (search_buffer) in Emacs needs this one opcode value. It is 00354 defined both in `regex.c' and here. */ 00355 #define RE_EXACTN_VALUE 1 00356 00357 /* Type for byte offsets within the string. POSIX mandates this. */ 00358 typedef int regoff_t; 00359 00360 00361 /* This is the structure we store register match data in. See 00362 regex.texinfo for a full description of what registers match. */ 00363 struct re_registers 00364 { 00365 unsigned num_regs; 00366 regoff_t *start; 00367 regoff_t *end; 00368 }; 00369 00370 00371 /* If `regs_allocated' is REGS_UNALLOCATED in the pattern buffer, 00372 `re_match_2' returns information about at least this many registers 00373 the first time a `regs' structure is passed. */ 00374 #ifndef RE_NREGS 00375 #define RE_NREGS 30 00376 #endif 00377 00378 00379 /* POSIX specification for registers. Aside from the different names than 00380 `re_registers', POSIX uses an array of structures, instead of a 00381 structure of arrays. */ 00382 typedef struct 00383 { 00384 regoff_t rm_so; /* Byte offset from string's start to substring's start. */ 00385 regoff_t rm_eo; /* Byte offset from string's start to substring's end. */ 00386 } regmatch_t; 00387 00388 /* Declarations for routines. */ 00389 00390 /* To avoid duplicating every routine declaration -- once with a 00391 prototype (if we are ANSI), and once without (if we aren't) -- we 00392 use the following macro to declare argument types. This 00393 unfortunately clutters up the declarations a bit, but I think it's 00394 worth it. */ 00395 00396 #if __STDC__ 00397 00398 #define _RE_ARGS(args) args 00399 00400 #else /* not __STDC__ */ 00401 00402 #define _RE_ARGS(args) () 00403 00404 #endif /* not __STDC__ */ 00405 00406 /* Sets the current default syntax to SYNTAX, and return the old syntax. 00407 You can also simply assign to the `re_syntax_options' variable. */ 00408 extern reg_syntax_t re_set_syntax _RE_ARGS ((reg_syntax_t syntax)); 00409 00410 /* Compile the regular expression PATTERN, with length LENGTH 00411 and syntax given by the global `re_syntax_options', into the buffer 00412 BUFFER. Return NULL if successful, and an error string if not. */ 00413 extern const char *re_compile_pattern 00414 _RE_ARGS ((const char *pattern, int length, 00415 struct re_pattern_buffer *buffer)); 00416 00417 00418 /* Compile a fastmap for the compiled pattern in BUFFER; used to 00419 accelerate searches. Return 0 if successful and -2 if was an 00420 internal error. */ 00421 extern int re_compile_fastmap _RE_ARGS ((struct re_pattern_buffer *buffer)); 00422 00423 00424 /* Search in the string STRING (with length LENGTH) for the pattern 00425 compiled into BUFFER. Start searching at position START, for RANGE 00426 characters. Return the starting position of the match, -1 for no 00427 match, or -2 for an internal error. Also return register 00428 information in REGS (if REGS and BUFFER->no_sub are nonzero). */ 00429 extern int re_search 00430 _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string, 00431 int length, int start, int range, struct re_registers *regs)); 00432 00433 00434 /* Like `re_search', but search in the concatenation of STRING1 and 00435 STRING2. Also, stop searching at index START + STOP. */ 00436 extern int re_search_2 00437 _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string1, 00438 int length1, const char *string2, int length2, 00439 int start, int range, struct re_registers *regs, int stop)); 00440 00441 00442 /* Like `re_search', but return how many characters in STRING the regexp 00443 in BUFFER matched, starting at position START. */ 00444 extern int re_match 00445 _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string, 00446 int length, int start, struct re_registers *regs)); 00447 00448 00449 /* Relates to `re_match' as `re_search_2' relates to `re_search'. */ 00450 extern int re_match_2 00451 _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string1, 00452 int length1, const char *string2, int length2, 00453 int start, struct re_registers *regs, int stop)); 00454 00455 00456 /* Set REGS to hold NUM_REGS registers, storing them in STARTS and 00457 ENDS. Subsequent matches using BUFFER and REGS will use this memory 00458 for recording register information. STARTS and ENDS must be 00459 allocated with malloc, and must each be at least `NUM_REGS * sizeof 00460 (regoff_t)' bytes long. 00461 00462 If NUM_REGS == 0, then subsequent matches should allocate their own 00463 register data. 00464 00465 Unless this function is called, the first search or match using 00466 PATTERN_BUFFER will allocate its own register data, without 00467 freeing the old data. */ 00468 extern void re_set_registers 00469 _RE_ARGS ((struct re_pattern_buffer *buffer, struct re_registers *regs, 00470 unsigned num_regs, regoff_t *starts, regoff_t *ends)); 00471 00472 /* 4.2 bsd compatibility. */ 00473 extern char *re_comp _RE_ARGS ((const char *)); 00474 extern int re_exec _RE_ARGS ((const char *)); 00475 00476 /* POSIX compatibility. */ 00477 extern int regcomp _RE_ARGS ((regex_t *preg, const char *pattern, int cflags)); 00478 extern int regexec 00479 _RE_ARGS ((const regex_t *preg, const char *string, size_t nmatch, 00480 regmatch_t pmatch[], int eflags)); 00481 extern size_t regerror 00482 _RE_ARGS ((int errcode, const regex_t *preg, char *errbuf, 00483 size_t errbuf_size)); 00484 extern void regfree _RE_ARGS ((regex_t *preg)); 00485 00486 #endif /* not __REGEXP_LIBRARY_H__ */ 00487 00488 /* 00489 Local variables: 00490 make-backup-files: t 00491 version-control: t 00492 trim-versions-without-asking: nil 00493 End: 00494 */ 00495 #endif 00496 00497 00498 extern int nasl_regcomp (regex_t *preg, const char *pattern, int cflags); 00499 extern int nasl_regexec (const regex_t *preg, const char *string, size_t nmatch, 00500 regmatch_t pmatch[], int eflags); 00501 extern size_t nasl_regerror (int errcode, const regex_t *preg, char *errbuf, 00502 size_t errbuf_size); 00503 extern reg_syntax_t nasl_re_set_syntax (reg_syntax_t syntax); 00504 extern char * nasl_regorig(regex_t * preg); 00505 extern void nasl_regfree (regex_t *preg);