Annotation of embedaddon/quagga/lib/regex-gnu.h, revision 1.1.1.1

1.1       misho       1: /* Definitions for data structures and routines for the regular
                      2:    expression library, version 0.12.
                      3:    Copyright (C) 1985,89,90,91,92,93,95,96,97,98 Free Software Foundation, Inc.
                      4: 
                      5:    This file is part of the GNU C Library.  Its master source is NOT part of
                      6:    the C library, however.  The master source lives in /gd/gnu/lib.
                      7: 
                      8:    The GNU C Library is free software; you can redistribute it and/or
                      9:    modify it under the terms of the GNU Library General Public License as
                     10:    published by the Free Software Foundation; either version 2 of the
                     11:    License, or (at your option) any later version.
                     12: 
                     13:    The GNU C Library is distributed in the hope that it will be useful,
                     14:    but WITHOUT ANY WARRANTY; without even the implied warranty of
                     15:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
                     16:    Library General Public License for more details.
                     17: 
                     18:    You should have received a copy of the GNU Library General Public
                     19:    License along with the GNU C Library; see the file COPYING.LIB.  If not,
                     20:    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
                     21:    Boston, MA 02111-1307, USA.  */
                     22: 
                     23: #ifndef _REGEX_H
                     24: #define _REGEX_H 1
                     25: 
                     26: /* Allow the use in C++ code.  */
                     27: #ifdef __cplusplus
                     28: extern "C" {
                     29: #endif
                     30: 
                     31: /* POSIX says that <sys/types.h> must be included (by the caller) before
                     32:    <regex.h>.  */
                     33: 
                     34: #if !defined _POSIX_C_SOURCE && !defined _POSIX_SOURCE && defined VMS
                     35: /* VMS doesn't have `size_t' in <sys/types.h>, even though POSIX says it
                     36:    should be there.  */
                     37: # include <stddef.h>
                     38: #endif
                     39: 
                     40: /* The following two types have to be signed and unsigned integer type
                     41:    wide enough to hold a value of a pointer.  For most ANSI compilers
                     42:    ptrdiff_t and size_t should be likely OK.  Still size of these two
                     43:    types is 2 for Microsoft C.  Ugh... */
                     44: typedef long int s_reg_t;
                     45: typedef unsigned long int active_reg_t;
                     46: 
                     47: /* The following bits are used to determine the regexp syntax we
                     48:    recognize.  The set/not-set meanings are chosen so that Emacs syntax
                     49:    remains the value 0.  The bits are given in alphabetical order, and
                     50:    the definitions shifted by one from the previous bit; thus, when we
                     51:    add or remove a bit, only one other definition need change.  */
                     52: typedef unsigned long int reg_syntax_t;
                     53: 
                     54: /* If this bit is not set, then \ inside a bracket expression is literal.
                     55:    If set, then such a \ quotes the following character.  */
                     56: #define RE_BACKSLASH_ESCAPE_IN_LISTS ((unsigned long int) 1)
                     57: 
                     58: /* If this bit is not set, then + and ? are operators, and \+ and \? are
                     59:      literals.
                     60:    If set, then \+ and \? are operators and + and ? are literals.  */
                     61: #define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)
                     62: 
                     63: /* If this bit is set, then character classes are supported.  They are:
                     64:      [:alpha:], [:upper:], [:lower:],  [:digit:], [:alnum:], [:xdigit:],
                     65:      [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:].
                     66:    If not set, then character classes are not supported.  */
                     67: #define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1)
                     68: 
                     69: /* If this bit is set, then ^ and $ are always anchors (outside bracket
                     70:      expressions, of course).
                     71:    If this bit is not set, then it depends:
                     72:         ^  is an anchor if it is at the beginning of a regular
                     73:            expression or after an open-group or an alternation operator;
                     74:         $  is an anchor if it is at the end of a regular expression, or
                     75:            before a close-group or an alternation operator.
                     76: 
                     77:    This bit could be (re)combined with RE_CONTEXT_INDEP_OPS, because
                     78:    POSIX draft 11.2 says that * etc. in leading positions is undefined.
                     79:    We already implemented a previous draft which made those constructs
                     80:    invalid, though, so we haven't changed the code back.  */
                     81: #define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1)
                     82: 
                     83: /* If this bit is set, then special characters are always special
                     84:      regardless of where they are in the pattern.
                     85:    If this bit is not set, then special characters are special only in
                     86:      some contexts; otherwise they are ordinary.  Specifically,
                     87:      * + ? and intervals are only special when not after the beginning,
                     88:      open-group, or alternation operator.  */
                     89: #define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1)
                     90: 
                     91: /* If this bit is set, then *, +, ?, and { cannot be first in an re or
                     92:      immediately after an alternation or begin-group operator.  */
                     93: #define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1)
                     94: 
                     95: /* If this bit is set, then . matches newline.
                     96:    If not set, then it doesn't.  */
                     97: #define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1)
                     98: 
                     99: /* If this bit is set, then . doesn't match NUL.
                    100:    If not set, then it does.  */
                    101: #define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1)
                    102: 
                    103: /* If this bit is set, nonmatching lists [^...] do not match newline.
                    104:    If not set, they do.  */
                    105: #define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1)
                    106: 
                    107: /* If this bit is set, either \{...\} or {...} defines an
                    108:      interval, depending on RE_NO_BK_BRACES.
                    109:    If not set, \{, \}, {, and } are literals.  */
                    110: #define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1)
                    111: 
                    112: /* If this bit is set, +, ? and | aren't recognized as operators.
                    113:    If not set, they are.  */
                    114: #define RE_LIMITED_OPS (RE_INTERVALS << 1)
                    115: 
                    116: /* If this bit is set, newline is an alternation operator.
                    117:    If not set, newline is literal.  */
                    118: #define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1)
                    119: 
                    120: /* If this bit is set, then `{...}' defines an interval, and \{ and \}
                    121:      are literals.
                    122:   If not set, then `\{...\}' defines an interval.  */
                    123: #define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1)
                    124: 
                    125: /* If this bit is set, (...) defines a group, and \( and \) are literals.
                    126:    If not set, \(...\) defines a group, and ( and ) are literals.  */
                    127: #define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1)
                    128: 
                    129: /* If this bit is set, then \<digit> matches <digit>.
                    130:    If not set, then \<digit> is a back-reference.  */
                    131: #define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1)
                    132: 
                    133: /* If this bit is set, then | is an alternation operator, and \| is literal.
                    134:    If not set, then \| is an alternation operator, and | is literal.  */
                    135: #define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1)
                    136: 
                    137: /* If this bit is set, then an ending range point collating higher
                    138:      than the starting range point, as in [z-a], is invalid.
                    139:    If not set, then when ending range point collates higher than the
                    140:      starting range point, the range is ignored.  */
                    141: #define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1)
                    142: 
                    143: /* If this bit is set, then an unmatched ) is ordinary.
                    144:    If not set, then an unmatched ) is invalid.  */
                    145: #define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_EMPTY_RANGES << 1)
                    146: 
                    147: /* If this bit is set, succeed as soon as we match the whole pattern,
                    148:    without further backtracking.  */
                    149: #define RE_NO_POSIX_BACKTRACKING (RE_UNMATCHED_RIGHT_PAREN_ORD << 1)
                    150: 
                    151: /* If this bit is set, do not process the GNU regex operators.
                    152:    If not set, then the GNU regex operators are recognized. */
                    153: #define RE_NO_GNU_OPS (RE_NO_POSIX_BACKTRACKING << 1)
                    154: 
                    155: /* If this bit is set, turn on internal regex debugging.
                    156:    If not set, and debugging was on, turn it off.
                    157:    This only works if regex.c is compiled -DDEBUG.
                    158:    We define this bit always, so that all that's needed to turn on
                    159:    debugging is to recompile regex.c; the calling code can always have
                    160:    this bit set, and it won't affect anything in the normal case. */
                    161: #define RE_DEBUG (RE_NO_GNU_OPS << 1)
                    162: 
                    163: /* This global variable defines the particular regexp syntax to use (for
                    164:    some interfaces).  When a regexp is compiled, the syntax used is
                    165:    stored in the pattern buffer, so changing this does not affect
                    166:    already-compiled regexps.  */
                    167: extern reg_syntax_t re_syntax_options;
                    168: 
                    169: /* Define combinations of the above bits for the standard possibilities.
                    170:    (The [[[ comments delimit what gets put into the Texinfo file, so
                    171:    don't delete them!)  */
                    172: /* [[[begin syntaxes]]] */
                    173: #define RE_SYNTAX_EMACS 0
                    174: 
                    175: #define RE_SYNTAX_AWK                                                  \
                    176:   (RE_BACKSLASH_ESCAPE_IN_LISTS   | RE_DOT_NOT_NULL                    \
                    177:    | RE_NO_BK_PARENS              | RE_NO_BK_REFS                      \
                    178:    | RE_NO_BK_VBAR                | RE_NO_EMPTY_RANGES                 \
                    179:    | RE_DOT_NEWLINE              | RE_CONTEXT_INDEP_ANCHORS            \
                    180:    | RE_UNMATCHED_RIGHT_PAREN_ORD | RE_NO_GNU_OPS)
                    181: 
                    182: #define RE_SYNTAX_GNU_AWK                                              \
                    183:   ((RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DEBUG)        \
                    184:    & ~(RE_DOT_NOT_NULL | RE_INTERVALS | RE_CONTEXT_INDEP_OPS))
                    185: 
                    186: #define RE_SYNTAX_POSIX_AWK                                            \
                    187:   (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS             \
                    188:    | RE_INTERVALS          | RE_NO_GNU_OPS)
                    189: 
                    190: #define RE_SYNTAX_GREP                                                 \
                    191:   (RE_BK_PLUS_QM              | RE_CHAR_CLASSES                                \
                    192:    | RE_HAT_LISTS_NOT_NEWLINE | RE_INTERVALS                           \
                    193:    | RE_NEWLINE_ALT)
                    194: 
                    195: #define RE_SYNTAX_EGREP                                                        \
                    196:   (RE_CHAR_CLASSES        | RE_CONTEXT_INDEP_ANCHORS                   \
                    197:    | RE_CONTEXT_INDEP_OPS | RE_HAT_LISTS_NOT_NEWLINE                   \
                    198:    | RE_NEWLINE_ALT       | RE_NO_BK_PARENS                            \
                    199:    | RE_NO_BK_VBAR)
                    200: 
                    201: #define RE_SYNTAX_POSIX_EGREP                                          \
                    202:   (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES)
                    203: 
                    204: /* P1003.2/D11.2, section 4.20.7.1, lines 5078ff.  */
                    205: #define RE_SYNTAX_ED RE_SYNTAX_POSIX_BASIC
                    206: 
                    207: #define RE_SYNTAX_SED RE_SYNTAX_POSIX_BASIC
                    208: 
                    209: /* Syntax bits common to both basic and extended POSIX regex syntax.  */
                    210: #define _RE_SYNTAX_POSIX_COMMON                                                \
                    211:   (RE_CHAR_CLASSES | RE_DOT_NEWLINE      | RE_DOT_NOT_NULL             \
                    212:    | RE_INTERVALS  | RE_NO_EMPTY_RANGES)
                    213: 
                    214: #define RE_SYNTAX_POSIX_BASIC                                          \
                    215:   (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM)
                    216: 
                    217: /* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes
                    218:    RE_LIMITED_OPS, i.e., \? \+ \| are not recognized.  Actually, this
                    219:    isn't minimal, since other operators, such as \`, aren't disabled.  */
                    220: #define RE_SYNTAX_POSIX_MINIMAL_BASIC                                  \
                    221:   (_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS)
                    222: 
                    223: #define RE_SYNTAX_POSIX_EXTENDED                                       \
                    224:   (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS                  \
                    225:    | RE_CONTEXT_INDEP_OPS  | RE_NO_BK_BRACES                           \
                    226:    | RE_NO_BK_PARENS       | RE_NO_BK_VBAR                             \
                    227:    | RE_UNMATCHED_RIGHT_PAREN_ORD)
                    228: 
                    229: /* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INVALID_OPS
                    230:    replaces RE_CONTEXT_INDEP_OPS and RE_NO_BK_REFS is added.  */
                    231: #define RE_SYNTAX_POSIX_MINIMAL_EXTENDED                               \
                    232:   (_RE_SYNTAX_POSIX_COMMON  | RE_CONTEXT_INDEP_ANCHORS                 \
                    233:    | RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES                          \
                    234:    | RE_NO_BK_PARENS        | RE_NO_BK_REFS                            \
                    235:    | RE_NO_BK_VBAR         | RE_UNMATCHED_RIGHT_PAREN_ORD)
                    236: /* [[[end syntaxes]]] */
                    237: 
                    238: /* Maximum number of duplicates an interval can allow.  Some systems
                    239:    (erroneously) define this in other header files, but we want our
                    240:    value, so remove any previous define.  */
                    241: #ifdef RE_DUP_MAX
                    242: # undef RE_DUP_MAX
                    243: #endif
                    244: /* If sizeof(int) == 2, then ((1 << 15) - 1) overflows.  */
                    245: #define RE_DUP_MAX (0x7fff)
                    246: 
                    247: 
                    248: /* POSIX `cflags' bits (i.e., information for `regcomp').  */
                    249: 
                    250: /* If this bit is set, then use extended regular expression syntax.
                    251:    If not set, then use basic regular expression syntax.  */
                    252: #define REG_EXTENDED 1
                    253: 
                    254: /* If this bit is set, then ignore case when matching.
                    255:    If not set, then case is significant.  */
                    256: #define REG_ICASE (REG_EXTENDED << 1)
                    257: 
                    258: /* If this bit is set, then anchors do not match at newline
                    259:      characters in the string.
                    260:    If not set, then anchors do match at newlines.  */
                    261: #define REG_NEWLINE (REG_ICASE << 1)
                    262: 
                    263: /* If this bit is set, then report only success or fail in regexec.
                    264:    If not set, then returns differ between not matching and errors.  */
                    265: #define REG_NOSUB (REG_NEWLINE << 1)
                    266: 
                    267: 
                    268: /* POSIX `eflags' bits (i.e., information for regexec).  */
                    269: 
                    270: /* If this bit is set, then the beginning-of-line operator doesn't match
                    271:      the beginning of the string (presumably because it's not the
                    272:      beginning of a line).
                    273:    If not set, then the beginning-of-line operator does match the
                    274:      beginning of the string.  */
                    275: #define REG_NOTBOL 1
                    276: 
                    277: /* Like REG_NOTBOL, except for the end-of-line.  */
                    278: #define REG_NOTEOL (1 << 1)
                    279: 
                    280: 
                    281: /* If any error codes are removed, changed, or added, update the
                    282:    `re_error_msg' table in regex.c.  */
                    283: typedef enum
                    284: {
                    285: #ifdef _XOPEN_SOURCE
                    286:   REG_ENOSYS = -1,     /* This will never happen for this implementation.  */
                    287: #endif
                    288: 
                    289:   REG_NOERROR = 0,     /* Success.  */
                    290:   REG_NOMATCH,         /* Didn't find a match (for regexec).  */
                    291: 
                    292:   /* POSIX regcomp return error codes.  (In the order listed in the
                    293:      standard.)  */
                    294:   REG_BADPAT,          /* Invalid pattern.  */
                    295:   REG_ECOLLATE,                /* Not implemented.  */
                    296:   REG_ECTYPE,          /* Invalid character class name.  */
                    297:   REG_EESCAPE,         /* Trailing backslash.  */
                    298:   REG_ESUBREG,         /* Invalid back reference.  */
                    299:   REG_EBRACK,          /* Unmatched left bracket.  */
                    300:   REG_EPAREN,          /* Parenthesis imbalance.  */
                    301:   REG_EBRACE,          /* Unmatched \{.  */
                    302:   REG_BADBR,           /* Invalid contents of \{\}.  */
                    303:   REG_ERANGE,          /* Invalid range end.  */
                    304:   REG_ESPACE,          /* Ran out of memory.  */
                    305:   REG_BADRPT,          /* No preceding re for repetition op.  */
                    306: 
                    307:   /* Error codes we've added.  */
                    308:   REG_EEND,            /* Premature end.  */
                    309:   REG_ESIZE,           /* Compiled pattern bigger than 2^16 bytes.  */
                    310:   REG_ERPAREN          /* Unmatched ) or \); not returned from regcomp.  */
                    311: } reg_errcode_t;
                    312: 
                    313: /* This data structure represents a compiled pattern.  Before calling
                    314:    the pattern compiler, the fields `buffer', `allocated', `fastmap',
                    315:    `translate', and `no_sub' can be set.  After the pattern has been
                    316:    compiled, the `re_nsub' field is available.  All other fields are
                    317:    private to the regex routines.  */
                    318: 
                    319: #ifndef RE_TRANSLATE_TYPE
                    320: # define RE_TRANSLATE_TYPE char *
                    321: #endif
                    322: 
                    323: struct re_pattern_buffer
                    324: {
                    325: /* [[[begin pattern_buffer]]] */
                    326:        /* Space that holds the compiled pattern.  It is declared as
                    327:           `unsigned char *' because its elements are
                    328:            sometimes used as array indexes.  */
                    329:   unsigned char *buffer;
                    330: 
                    331:        /* Number of bytes to which `buffer' points.  */
                    332:   unsigned long int allocated;
                    333: 
                    334:        /* Number of bytes actually used in `buffer'.  */
                    335:   unsigned long int used;
                    336: 
                    337:         /* Syntax setting with which the pattern was compiled.  */
                    338:   reg_syntax_t syntax;
                    339: 
                    340:         /* Pointer to a fastmap, if any, otherwise zero.  re_search uses
                    341:            the fastmap, if there is one, to skip over impossible
                    342:            starting points for matches.  */
                    343:   char *fastmap;
                    344: 
                    345:         /* Either a translate table to apply to all characters before
                    346:            comparing them, or zero for no translation.  The translation
                    347:            is applied to a pattern when it is compiled and to a string
                    348:            when it is matched.  */
                    349:   RE_TRANSLATE_TYPE translate;
                    350: 
                    351:        /* Number of subexpressions found by the compiler.  */
                    352:   size_t re_nsub;
                    353: 
                    354:         /* Zero if this pattern cannot match the empty string, one else.
                    355:            Well, in truth it's used only in `re_search_2', to see
                    356:            whether or not we should use the fastmap, so we don't set
                    357:            this absolutely perfectly; see `re_compile_fastmap' (the
                    358:            `duplicate' case).  */
                    359:   unsigned can_be_null : 1;
                    360: 
                    361:         /* If REGS_UNALLOCATED, allocate space in the `regs' structure
                    362:              for `max (RE_NREGS, re_nsub + 1)' groups.
                    363:            If REGS_REALLOCATE, reallocate space if necessary.
                    364:            If REGS_FIXED, use what's there.  */
                    365: #define REGS_UNALLOCATED 0
                    366: #define REGS_REALLOCATE 1
                    367: #define REGS_FIXED 2
                    368:   unsigned regs_allocated : 2;
                    369: 
                    370:         /* Set to zero when `regex_compile' compiles a pattern; set to one
                    371:            by `re_compile_fastmap' if it updates the fastmap.  */
                    372:   unsigned fastmap_accurate : 1;
                    373: 
                    374:         /* If set, `re_match_2' does not return information about
                    375:            subexpressions.  */
                    376:   unsigned no_sub : 1;
                    377: 
                    378:         /* If set, a beginning-of-line anchor doesn't match at the
                    379:            beginning of the string.  */
                    380:   unsigned not_bol : 1;
                    381: 
                    382:         /* Similarly for an end-of-line anchor.  */
                    383:   unsigned not_eol : 1;
                    384: 
                    385:         /* If true, an anchor at a newline matches.  */
                    386:   unsigned newline_anchor : 1;
                    387: 
                    388: /* [[[end pattern_buffer]]] */
                    389: };
                    390: 
                    391: typedef struct re_pattern_buffer regex_t;
                    392: 
                    393: /* Type for byte offsets within the string.  POSIX mandates this.  */
                    394: typedef int regoff_t;
                    395: 
                    396: 
                    397: /* This is the structure we store register match data in.  See
                    398:    regex.texinfo for a full description of what registers match.  */
                    399: struct re_registers
                    400: {
                    401:   unsigned num_regs;
                    402:   regoff_t *start;
                    403:   regoff_t *end;
                    404: };
                    405: 
                    406: 
                    407: /* If `regs_allocated' is REGS_UNALLOCATED in the pattern buffer,
                    408:    `re_match_2' returns information about at least this many registers
                    409:    the first time a `regs' structure is passed.  */
                    410: #ifndef RE_NREGS
                    411: # define RE_NREGS 30
                    412: #endif
                    413: 
                    414: 
                    415: /* POSIX specification for registers.  Aside from the different names than
                    416:    `re_registers', POSIX uses an array of structures, instead of a
                    417:    structure of arrays.  */
                    418: typedef struct
                    419: {
                    420:   regoff_t rm_so;  /* Byte offset from string's start to substring's start.  */
                    421:   regoff_t rm_eo;  /* Byte offset from string's start to substring's end.  */
                    422: } regmatch_t;
                    423: 
                    424: /* Declarations for routines.  */
                    425: 
                    426: /* To avoid duplicating every routine declaration -- once with a
                    427:    prototype (if we are ANSI), and once without (if we aren't) -- we
                    428:    use the following macro to declare argument types.  This
                    429:    unfortunately clutters up the declarations a bit, but I think it's
                    430:    worth it.  */
                    431: 
                    432: #if __STDC__
                    433: 
                    434: # define _RE_ARGS(args) args
                    435: 
                    436: #else /* not __STDC__ */
                    437: 
                    438: # define _RE_ARGS(args) ()
                    439: 
                    440: #endif /* not __STDC__ */
                    441: 
                    442: /* Sets the current default syntax to SYNTAX, and return the old syntax.
                    443:    You can also simply assign to the `re_syntax_options' variable.  */
                    444: extern reg_syntax_t re_set_syntax _RE_ARGS ((reg_syntax_t syntax));
                    445: 
                    446: /* Compile the regular expression PATTERN, with length LENGTH
                    447:    and syntax given by the global `re_syntax_options', into the buffer
                    448:    BUFFER.  Return NULL if successful, and an error string if not.  */
                    449: extern const char *re_compile_pattern
                    450:   _RE_ARGS ((const char *pattern, size_t length,
                    451:              struct re_pattern_buffer *buffer));
                    452: 
                    453: 
                    454: /* Compile a fastmap for the compiled pattern in BUFFER; used to
                    455:    accelerate searches.  Return 0 if successful and -2 if was an
                    456:    internal error.  */
                    457: extern int re_compile_fastmap _RE_ARGS ((struct re_pattern_buffer *buffer));
                    458: 
                    459: 
                    460: /* Search in the string STRING (with length LENGTH) for the pattern
                    461:    compiled into BUFFER.  Start searching at position START, for RANGE
                    462:    characters.  Return the starting position of the match, -1 for no
                    463:    match, or -2 for an internal error.  Also return register
                    464:    information in REGS (if REGS and BUFFER->no_sub are nonzero).  */
                    465: extern int re_search
                    466:   _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string,
                    467:             int length, int start, int range, struct re_registers *regs));
                    468: 
                    469: 
                    470: /* Like `re_search', but search in the concatenation of STRING1 and
                    471:    STRING2.  Also, stop searching at index START + STOP.  */
                    472: extern int re_search_2
                    473:   _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string1,
                    474:              int length1, const char *string2, int length2,
                    475:              int start, int range, struct re_registers *regs, int stop));
                    476: 
                    477: 
                    478: /* Like `re_search', but return how many characters in STRING the regexp
                    479:    in BUFFER matched, starting at position START.  */
                    480: extern int re_match
                    481:   _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string,
                    482:              int length, int start, struct re_registers *regs));
                    483: 
                    484: 
                    485: /* Relates to `re_match' as `re_search_2' relates to `re_search'.  */
                    486: extern int re_match_2
                    487:   _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string1,
                    488:              int length1, const char *string2, int length2,
                    489:              int start, struct re_registers *regs, int stop));
                    490: 
                    491: 
                    492: /* Set REGS to hold NUM_REGS registers, storing them in STARTS and
                    493:    ENDS.  Subsequent matches using BUFFER and REGS will use this memory
                    494:    for recording register information.  STARTS and ENDS must be
                    495:    allocated with malloc, and must each be at least `NUM_REGS * sizeof
                    496:    (regoff_t)' bytes long.
                    497: 
                    498:    If NUM_REGS == 0, then subsequent matches should allocate their own
                    499:    register data.
                    500: 
                    501:    Unless this function is called, the first search or match using
                    502:    PATTERN_BUFFER will allocate its own register data, without
                    503:    freeing the old data.  */
                    504: extern void re_set_registers
                    505:   _RE_ARGS ((struct re_pattern_buffer *buffer, struct re_registers *regs,
                    506:              unsigned num_regs, regoff_t *starts, regoff_t *ends));
                    507: 
                    508: #if defined _REGEX_RE_COMP || defined _LIBC
                    509: # ifndef _CRAY
                    510: /* 4.2 bsd compatibility.  */
                    511: extern char *re_comp _RE_ARGS ((const char *));
                    512: extern int re_exec _RE_ARGS ((const char *));
                    513: # endif
                    514: #endif
                    515: 
                    516: /* POSIX compatibility.  */
                    517: extern int regcomp _RE_ARGS ((regex_t *__preg, const char *__pattern,
                    518:                              int __cflags));
                    519: 
                    520: extern int regexec _RE_ARGS ((const regex_t *__preg,
                    521:                              const char *__string, size_t __nmatch,
                    522:                              regmatch_t __pmatch[], int __eflags));
                    523: 
                    524: extern size_t regerror _RE_ARGS ((int __errcode, const regex_t *__preg,
                    525:                                  char *__errbuf, size_t __errbuf_size));
                    526: 
                    527: extern void regfree _RE_ARGS ((regex_t *__preg));
                    528: 
                    529: 
                    530: #ifdef __cplusplus
                    531: }
                    532: #endif /* C++ */
                    533: 
                    534: #endif /* regex.h */
                    535: 
                    536: /*
                    537: Local variables:
                    538: make-backup-files: t
                    539: version-control: t
                    540: trim-versions-without-asking: nil
                    541: End:
                    542: */

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