/[pcre]/code/trunk/config.h.in
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revision 86 by nigel, Sat Feb 24 21:41:13 2007 UTC revision 87 by nigel, Sat Feb 24 21:41:21 2007 UTC
# Line 1  Line 1 
1    
2  /* On Unix systems config.in is converted by configure into config.h. PCRE is  /* On Unix-like systems config.in is converted by "configure" into config.h.
3  written in Standard C, but there are a few non-standard things it can cope  Some other environments also support the use of "configure". PCRE is written in
4  with, allowing it to run on SunOS4 and other "close to standard" systems.  Standard C, but there are a few non-standard things it can cope with, allowing
5    it to run on SunOS4 and other "close to standard" systems.
6  On a non-Unix system you should just copy this file into config.h, and set up  
7  the macros the way you need them. You should normally change the definitions of  On a non-Unix-like system you should just copy this file into config.h, and set
8  HAVE_STRERROR and HAVE_MEMMOVE to 1. Unfortunately, because of the way autoconf  up the macros the way you need them. You should normally change the definitions
9  works, these cannot be made the defaults. If your system has bcopy() and not  of HAVE_STRERROR and HAVE_MEMMOVE to 1. Unfortunately, because of the way
10  memmove(), change the definition of HAVE_BCOPY instead of HAVE_MEMMOVE. If your  autoconf works, these cannot be made the defaults. If your system has bcopy()
11  system has neither bcopy() nor memmove(), leave them both as 0; an emulation  and not memmove(), change the definition of HAVE_BCOPY instead of HAVE_MEMMOVE.
12  function will be used. */  If your system has neither bcopy() nor memmove(), leave them both as 0; an
13    emulation function will be used. */
14    
15  /* If you are compiling for a system that uses EBCDIC instead of ASCII  /* If you are compiling for a system that uses EBCDIC instead of ASCII
16  character codes, define this macro as 1. On systems that can use "configure",  character codes, define this macro as 1. On systems that can use "configure",
# Line 19  this can be done via --enable-ebcdic. */ Line 20  this can be done via --enable-ebcdic. */
20  #define EBCDIC 0  #define EBCDIC 0
21  #endif  #endif
22    
23  /* If you are compiling for a system that needs some magic to be inserted  /* If you are compiling for a system other than a Unix-like system or Win32,
24  before the definition of an exported function, define this macro to contain the  and it needs some magic to be inserted before the definition of a function that
25  relevant magic. It apears at the start of every exported function. */  is exported by the library, define this macro to contain the relevant magic. If
26    you do not define this macro, it defaults to "extern" for a C compiler and
27    "extern C" for a C++ compiler on non-Win32 systems. This macro apears at the
28    start of every exported function that is part of the external API. It does not
29    appear on functions that are "external" in the C sense, but which are internal
30    to the library. */
31    
32  #define PCRE_EXPORT  /* #define PCRE_DATA_SCOPE */
33    
34  /* Define to empty if the "const" keyword does not work. */  /* Define the following macro to empty if the "const" keyword does not work. */
35    
36  #undef const  #undef const
37    
38  /* Define to "unsigned" if <stddef.h> doesn't define size_t. */  /* Define the following macro to "unsigned" if <stddef.h> does not define
39    size_t. */
40    
41  #undef size_t  #undef size_t
42    
43  /* The following two definitions are mainly for the benefit of SunOS4, which  /* The following two definitions are mainly for the benefit of SunOS4, which
44  doesn't have the strerror() or memmove() functions that should be present in  does not have the strerror() or memmove() functions that should be present in
45  all Standard C libraries. The macros HAVE_STRERROR and HAVE_MEMMOVE should  all Standard C libraries. The macros HAVE_STRERROR and HAVE_MEMMOVE should
46  normally be defined with the value 1 for other systems, but unfortunately we  normally be defined with the value 1 for other systems, but unfortunately we
47  can't make this the default because "configure" files generated by autoconf  cannot make this the default because "configure" files generated by autoconf
48  will only change 0 to 1; they won't change 1 to 0 if the functions are not  will only change 0 to 1; they won't change 1 to 0 if the functions are not
49  found. */  found. */
50    
51  #define HAVE_STRERROR 0  #define HAVE_STRERROR 0
52  #define HAVE_MEMMOVE  0  #define HAVE_MEMMOVE  0
53    
54  /* There are some non-Unix systems that don't even have bcopy(). If this macro  /* There are some non-Unix-like systems that don't even have bcopy(). If this
55  is false, an emulation is used. If HAVE_MEMMOVE is set to 1, the value of  macro is false, an emulation is used. If HAVE_MEMMOVE is set to 1, the value of
56  HAVE_BCOPY is not relevant. */  HAVE_BCOPY is not relevant. */
57    
58  #define HAVE_BCOPY    0  #define HAVE_BCOPY    0
59    
60  /* The value of NEWLINE determines the newline character. The default is to  /* The value of NEWLINE determines the newline character. The default is to
61  leave it up to the compiler, but some sites want to force a particular value.  leave it up to the compiler, but some sites want to force a particular value.
62  On Unix systems, "configure" can be used to override this default. */  On Unix-like systems, "configure" can be used to override this default. */
63    
64  #ifndef NEWLINE  #ifndef NEWLINE
65  #define NEWLINE '\n'  #define NEWLINE '\n'
66  #endif  #endif
67    
68  /* The value of LINK_SIZE determines the number of bytes used to store  /* The value of LINK_SIZE determines the number of bytes used to store links as
69  links as offsets within the compiled regex. The default is 2, which allows for  offsets within the compiled regex. The default is 2, which allows for compiled
70  compiled patterns up to 64K long. This covers the vast majority of cases.  patterns up to 64K long. This covers the vast majority of cases. However, PCRE
71  However, PCRE can also be compiled to use 3 or 4 bytes instead. This allows for  can also be compiled to use 3 or 4 bytes instead. This allows for longer
72  longer patterns in extreme cases. On Unix systems, "configure" can be used to  patterns in extreme cases. On systems that support it, "configure" can be used
73  override this default. */  to override this default. */
74    
75  #ifndef LINK_SIZE  #ifndef LINK_SIZE
76  #define LINK_SIZE   2  #define LINK_SIZE   2
77  #endif  #endif
78    
 /* The value of MATCH_LIMIT determines the default number of times the match()  
 function can be called during a single execution of pcre_exec(). (There is a  
 runtime method of setting a different limit.) The limit exists in order to  
 catch runaway regular expressions that take for ever to determine that they do  
 not match. The default is set very large so that it does not accidentally catch  
 legitimate cases. On Unix systems, "configure" can be used to override this  
 default default. */  
   
 #ifndef MATCH_LIMIT  
 #define MATCH_LIMIT 10000000  
 #endif  
   
79  /* When calling PCRE via the POSIX interface, additional working storage is  /* When calling PCRE via the POSIX interface, additional working storage is
80  required for holding the pointers to capturing substrings because PCRE requires  required for holding the pointers to capturing substrings because PCRE requires
81  three integers per substring, whereas the POSIX interface provides only two. If  three integers per substring, whereas the POSIX interface provides only two. If
82  the number of expected substrings is small, the wrapper function uses space on  the number of expected substrings is small, the wrapper function uses space on
83  the stack, because this is faster than using malloc() for each call. The  the stack, because this is faster than using malloc() for each call. The
84  threshold above which the stack is no longer use is defined by POSIX_MALLOC_  threshold above which the stack is no longer used is defined by POSIX_MALLOC_
85  THRESHOLD. On Unix systems, "configure" can be used to override this default.  THRESHOLD. On systems that support it, "configure" can be used to override this
86  */  default. */
87    
88  #ifndef POSIX_MALLOC_THRESHOLD  #ifndef POSIX_MALLOC_THRESHOLD
89  #define POSIX_MALLOC_THRESHOLD 10  #define POSIX_MALLOC_THRESHOLD 10
# Line 97  THRESHOLD. On Unix systems, "configure" Line 92  THRESHOLD. On Unix systems, "configure"
92  /* PCRE uses recursive function calls to handle backtracking while matching.  /* PCRE uses recursive function calls to handle backtracking while matching.
93  This can sometimes be a problem on systems that have stacks of limited size.  This can sometimes be a problem on systems that have stacks of limited size.
94  Define NO_RECURSE to get a version that doesn't use recursion in the match()  Define NO_RECURSE to get a version that doesn't use recursion in the match()
95  function; instead it creates its own stack by steam using pcre_recurse_malloc  function; instead it creates its own stack by steam using pcre_recurse_malloc()
96  to get memory. For more detail, see comments and other stuff just above the  to obtain memory from the heap. For more detail, see the comments and other
97  match() function. On Unix systems, "configure" can be used to set this in the  stuff just above the match() function. On systems that support it, "configure"
98  Makefile (use --disable-stack-for-recursion). */  can be used to set this in the Makefile (use --disable-stack-for-recursion). */
99    
100  /* #define NO_RECURSE */  /* #define NO_RECURSE */
101    
102    /* The value of MATCH_LIMIT determines the default number of times the internal
103    match() function can be called during a single execution of pcre_exec(). There
104    is a runtime interface for setting a different limit. The limit exists in order
105    to catch runaway regular expressions that take for ever to determine that they
106    do not match. The default is set very large so that it does not accidentally
107    catch legitimate cases. On systems that support it, "configure" can be used to
108    override this default default. */
109    
110    #ifndef MATCH_LIMIT
111    #define MATCH_LIMIT 10000000
112    #endif
113    
114    /* The above limit applies to all calls of match(), whether or not they
115    increase the recursion depth. In some environments it is desirable to limit the
116    depth of recursive calls of match() more strictly, in order to restrict the
117    maximum amount of stack (or heap, if NO_RECURSE is defined) that is used. The
118    value of MATCH_LIMIT_RECURSION applies only to recursive calls of match(). To
119    have any useful effect, it must be less than the value of MATCH_LIMIT. There is
120    a runtime method for setting a different limit. On systems that support it,
121    "configure" can be used to override this default default. */
122    
123    #ifndef MATCH_LIMIT_RECURSION
124    #define MATCH_LIMIT_RECURSION MATCH_LIMIT
125    #endif
126    
127  /* End */  /* End */

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