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Contents of /code/tags/pcre-6.6/config.h.in

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Revision 87 - (hide annotations) (download)
Sat Feb 24 21:41:21 2007 UTC (8 years, 2 months ago) by nigel
Original Path: code/trunk/config.h.in
File size: 5766 byte(s)
Load pcre-6.5 into code/trunk.

1 nigel 85
2 nigel 87 /* On Unix-like systems config.in is converted by "configure" into config.h.
3     Some other environments also support the use of "configure". PCRE is written in
4     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 nigel 85
7 nigel 87 On a non-Unix-like system you should just copy this file into config.h, and set
8     up the macros the way you need them. You should normally change the definitions
9     of HAVE_STRERROR and HAVE_MEMMOVE to 1. Unfortunately, because of the way
10     autoconf works, these cannot be made the defaults. If your system has bcopy()
11     and not memmove(), change the definition of HAVE_BCOPY instead of HAVE_MEMMOVE.
12     If your system has neither bcopy() nor memmove(), leave them both as 0; an
13     emulation function will be used. */
14 nigel 85
15     /* 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",
17     this can be done via --enable-ebcdic. */
19     #ifndef EBCDIC
20     #define EBCDIC 0
21     #endif
23 nigel 87 /* If you are compiling for a system other than a Unix-like system or Win32,
24     and it needs some magic to be inserted before the definition of a function that
25     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 nigel 85
32 nigel 87 /* #define PCRE_DATA_SCOPE */
33 nigel 85
34 nigel 87 /* Define the following macro to empty if the "const" keyword does not work. */
35 nigel 85
36     #undef const
38 nigel 87 /* Define the following macro to "unsigned" if <stddef.h> does not define
39     size_t. */
40 nigel 85
41     #undef size_t
43     /* The following two definitions are mainly for the benefit of SunOS4, which
44 nigel 87 does not have the strerror() or memmove() functions that should be present in
45 nigel 85 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
47 nigel 87 cannot make this the default because "configure" files generated by autoconf
48 nigel 85 will only change 0 to 1; they won't change 1 to 0 if the functions are not
49     found. */
51     #define HAVE_STRERROR 0
52     #define HAVE_MEMMOVE 0
54 nigel 87 /* There are some non-Unix-like systems that don't even have bcopy(). If this
55     macro is false, an emulation is used. If HAVE_MEMMOVE is set to 1, the value of
56 nigel 85 HAVE_BCOPY is not relevant. */
58     #define HAVE_BCOPY 0
60     /* 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.
62 nigel 87 On Unix-like systems, "configure" can be used to override this default. */
63 nigel 85
64     #ifndef NEWLINE
65     #define NEWLINE '\n'
66     #endif
68 nigel 87 /* The value of LINK_SIZE determines the number of bytes used to store links as
69     offsets within the compiled regex. The default is 2, which allows for compiled
70     patterns up to 64K long. This covers the vast majority of cases. However, PCRE
71     can also be compiled to use 3 or 4 bytes instead. This allows for longer
72     patterns in extreme cases. On systems that support it, "configure" can be used
73     to override this default. */
74 nigel 85
75     #ifndef LINK_SIZE
76     #define LINK_SIZE 2
77     #endif
79     /* When calling PCRE via the POSIX interface, additional working storage is
80     required for holding the pointers to capturing substrings because PCRE requires
81     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
83     the stack, because this is faster than using malloc() for each call. The
84 nigel 87 threshold above which the stack is no longer used is defined by POSIX_MALLOC_
85     THRESHOLD. On systems that support it, "configure" can be used to override this
86     default. */
87 nigel 85
89     #define POSIX_MALLOC_THRESHOLD 10
90     #endif
92     /* 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.
94     Define NO_RECURSE to get a version that doesn't use recursion in the match()
95 nigel 87 function; instead it creates its own stack by steam using pcre_recurse_malloc()
96     to obtain memory from the heap. For more detail, see the comments and other
97     stuff just above the match() function. On systems that support it, "configure"
98     can be used to set this in the Makefile (use --disable-stack-for-recursion). */
99 nigel 85
100     /* #define NO_RECURSE */
102 nigel 87 /* 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. */
110     #ifndef MATCH_LIMIT
111     #define MATCH_LIMIT 10000000
112     #endif
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. */
125     #endif
127 nigel 85 /* End */

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