/[pcre]/code/tags/pcre-4.1/README
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revision 53 by nigel, Sat Feb 24 21:39:42 2007 UTC revision 63 by nigel, Sat Feb 24 21:40:03 2007 UTC
# Line 30  Windows systems (I myself do not use Win Line 30  Windows systems (I myself do not use Win
30  others are pointers to URLs containing relevant files.  others are pointers to URLs containing relevant files.
31    
32    
33  Building PCRE on a Unix system  Building PCRE on a Unix-like system
34  ------------------------------  -----------------------------------
35    
36  To build PCRE on a Unix system, first run the "configure" command from the PCRE  To build PCRE on a Unix-like system, first run the "configure" command from the
37  distribution directory, with your current directory set to the directory where  PCRE distribution directory, with your current directory set to the directory
38  you want the files to be created. This command is a standard GNU "autoconf"  where you want the files to be created. This command is a standard GNU
39  configuration script, for which generic instructions are supplied in INSTALL.  "autoconf" configuration script, for which generic instructions are supplied in
40    INSTALL.
41    
42  Most commonly, people build PCRE within its own distribution directory, and in  Most commonly, people build PCRE within its own distribution directory, and in
43  this case, on many systems, just running "./configure" is sufficient, but the  this case, on many systems, just running "./configure" is sufficient, but the
# Line 55  into /source/pcre/pcre-xxx, but you want Line 56  into /source/pcre/pcre-xxx, but you want
56  cd /build/pcre/pcre-xxx  cd /build/pcre/pcre-xxx
57  /source/pcre/pcre-xxx/configure  /source/pcre/pcre-xxx/configure
58    
59  If you want to make use of the experimential, incomplete support for UTF-8  There are some optional features that can be included or omitted from the PCRE
60  character strings in PCRE, you must add --enable-utf8 to the "configure"  library. You can read more about them in the pcrebuild man page.
61  command. Without it, the code for handling UTF-8 is not included in the  
62  library. (Even when included, it still has to be enabled by an option at run  . If you want to make use of the support for UTF-8 character strings in PCRE,
63  time.)    you must add --enable-utf8 to the "configure" command. Without it, the code
64      for handling UTF-8 is not included in the library. (Even when included, it
65      still has to be enabled by an option at run time.)
66    
67    . You can build PCRE to recognized CR or NL as the newline character, instead
68      of whatever your compiler uses for "\n", by adding --newline-is-cr or
69      --newline-is-nl to the "configure" command, respectively. Only do this if you
70      really understand what you are doing. On traditional Unix-like systems, the
71      newline character is NL.
72    
73    . When called via the POSIX interface, PCRE uses malloc() to get additional
74      storage for processing capturing parentheses if there are more than 10 of
75      them. You can increase this threshold by setting, for example,
76    
77      --with-posix-malloc-threshold=20
78    
79      on the "configure" command.
80    
81    . PCRE has a counter which can be set to limit the amount of resources it uses.
82      If the limit is exceeded during a match, the match fails. The default is ten
83      million. You can change the default by setting, for example,
84    
85      --with-match-limit=500000
86    
87      on the "configure" command. This is just the default; individual calls to
88      pcre_exec() can supply their own value. There is discussion on the pcreapi
89      man page.
90    
91    . The default maximum compiled pattern size is around 64K. You can increase
92      this by adding --with-link-size=3 to the "configure" command. You can
93      increase it even more by setting --with-link-size=4, but this is unlikely
94      ever to be necessary. If you build PCRE with an increased link size, test 2
95      (and 5 if you are using UTF-8) will fail. Part of the output of these tests
96      is a representation of the compiled pattern, and this changes with the link
97      size.
98    
99  The "configure" script builds five files:  The "configure" script builds five files:
100    
# Line 89  outputs information about where the libr Line 124  outputs information about where the libr
124  included in makefiles for programs that use PCRE, saving the programmer from  included in makefiles for programs that use PCRE, saving the programmer from
125  having to remember too many details.  having to remember too many details.
126    
 There is one esoteric feature that is controlled by "configure". It concerns  
 the character value used for "newline", and is something that you probably do  
 not want to change on a Unix system. The default is to use whatever value your  
 compiler gives to '\n'. By using --enable-newline-is-cr or  
 --enable-newline-is-lf you can force the value to be CR (13) or LF (10) if you  
 really want to.  
   
127    
128  Shared libraries on Unix systems  Shared libraries on Unix-like systems
129  --------------------------------  -------------------------------------
130    
131  The default distribution builds PCRE as two shared libraries and two static  The default distribution builds PCRE as two shared libraries and two static
132  libraries, as long as the operating system supports shared libraries. Shared  libraries, as long as the operating system supports shared libraries. Shared
# Line 123  Then run "make" in the usual way. Simila Line 151  Then run "make" in the usual way. Simila
151  build only shared libraries.  build only shared libraries.
152    
153    
154    Cross-compiling on a Unix-like system
155    -------------------------------------
156    
157    You can specify CC and CFLAGS in the normal way to the "configure" command, in
158    order to cross-compile PCRE for some other host. However, during the building
159    process, the dftables.c source file is compiled *and run* on the local host, in
160    order to generate the default character tables (the chartables.c file). It
161    therefore needs to be compiled with the local compiler, not the cross compiler.
162    You can do this by specifying HOST_CC (and if necessary HOST_CFLAGS) when
163    calling the "configure" command. If they are not specified, they default to the
164    values of CC and CFLAGS.
165    
166    
167  Building on non-Unix systems  Building on non-Unix systems
168  ----------------------------  ----------------------------
169    
# Line 140  To test PCRE on a Unix system, run the R Line 181  To test PCRE on a Unix system, run the R
181  configuring process. (This can also be run by "make runtest", "make check", or  configuring process. (This can also be run by "make runtest", "make check", or
182  "make test".) For other systems, see the instruction in NON-UNIX-USE.  "make test".) For other systems, see the instruction in NON-UNIX-USE.
183    
184  The script runs the pcretest test program (which is documented in the doc  The script runs the pcretest test program (which is documented in its own man
185  directory) on each of the testinput files (in the testdata directory) in turn,  page) on each of the testinput files (in the testdata directory) in turn,
186  and compares the output with the contents of the corresponding testoutput file.  and compares the output with the contents of the corresponding testoutput file.
187  A file called testtry is used to hold the output from pcretest. To run pcretest  A file called testtry is used to hold the output from pcretest. To run pcretest
188  on just one of the test files, give its number as an argument to RunTest, for  on just one of the test files, give its number as an argument to RunTest, for
189  example:  example:
190    
191    RunTest 3    RunTest 2
192    
193  The first and third test files can also be fed directly into the perltest  The first file can also be fed directly into the perltest script to check that
194  script to check that Perl gives the same results. The third file requires the  Perl gives the same results. The only difference you should see is in the first
195  additional features of release 5.005, which is why it is kept separate from the  few lines, where the Perl version is given instead of the PCRE version.
 main test input, which needs only Perl 5.004. In the long run, when 5.005 (or  
 higher) is widespread, these two test files may get amalgamated.  
196    
197  The second set of tests check pcre_fullinfo(), pcre_info(), pcre_study(),  The second set of tests check pcre_fullinfo(), pcre_info(), pcre_study(),
198  pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error  pcre_copy_substring(), pcre_get_substring(), pcre_get_substring_list(), error
# Line 171  listed for checking. Where the compariso Line 210  listed for checking. Where the compariso
210  test will contain [\x00-\xff], and similarly in some other cases. This is not a  test will contain [\x00-\xff], and similarly in some other cases. This is not a
211  bug in PCRE.  bug in PCRE.
212    
213  The fourth set of tests checks pcre_maketables(), the facility for building a  The third set of tests checks pcre_maketables(), the facility for building a
214  set of character tables for a specific locale and using them instead of the  set of character tables for a specific locale and using them instead of the
215  default tables. The tests make use of the "fr" (French) locale. Before running  default tables. The tests make use of the "fr" (French) locale. Before running
216  the test, the script checks for the presence of this locale by running the  the test, the script checks for the presence of this locale by running the
217  "locale" command. If that command fails, or if it doesn't include "fr" in the  "locale" command. If that command fails, or if it doesn't include "fr" in the
218  list of available locales, the fourth test cannot be run, and a comment is  list of available locales, the third test cannot be run, and a comment is
219  output to say why. If running this test produces instances of the error  output to say why. If running this test produces instances of the error
220    
221    ** Failed to set locale "fr"    ** Failed to set locale "fr"
# Line 184  output to say why. If running this test Line 223  output to say why. If running this test
223  in the comparison output, it means that locale is not available on your system,  in the comparison output, it means that locale is not available on your system,
224  despite being listed by "locale". This does not mean that PCRE is broken.  despite being listed by "locale". This does not mean that PCRE is broken.
225    
226  The fifth test checks the experimental, incomplete UTF-8 support. It is not run  The fourth test checks the UTF-8 support. It is not run automatically unless
227  automatically unless PCRE is built with UTF-8 support. This file can be fed  PCRE is built with UTF-8 support. To do this you must set --enable-utf8 when
228  directly to the perltest8 script, which requires Perl 5.6 or higher. The sixth  running "configure". This file can be also fed directly to the perltest script,
229  file tests internal UTF-8 features of PCRE that are not relevant to Perl.  provided you are running Perl 5.8 or higher. (For Perl 5.6, a small patch,
230    commented in the script, can be be used.)
231    
232    The fifth and final file tests error handling with UTF-8 encoding, and internal
233    UTF-8 features of PCRE that are not relevant to Perl.
234    
235    
236  Character tables  Character tables
# Line 243  The distribution should contain the foll Line 286  The distribution should contain the foll
286    study.c               ) source of    study.c               ) source of
287    pcre.c                )   the functions    pcre.c                )   the functions
288    pcreposix.c           )    pcreposix.c           )
289      printint.c            )
290    pcre.in               "source" for the header for the external API; pcre.h    pcre.in               "source" for the header for the external API; pcre.h
291                            is built from this by "configure"                            is built from this by "configure"
292    pcreposix.h           header for the external POSIX wrapper API    pcreposix.h           header for the external POSIX wrapper API
# Line 266  The distribution should contain the foll Line 310  The distribution should contain the foll
310    configure             a configuring shell script (built by autoconf)    configure             a configuring shell script (built by autoconf)
311    configure.in          the autoconf input used to build configure    configure.in          the autoconf input used to build configure
312    doc/Tech.Notes        notes on the encoding    doc/Tech.Notes        notes on the encoding
313    doc/pcre.3            man page source for the PCRE functions    doc/*.3               man page sources for the PCRE functions
314    doc/pcre.html         HTML version    doc/*.1               man page sources for pcregrep and pcretest
315    doc/pcre.txt          plain text version    doc/html/*            HTML documentation
316    doc/pcreposix.3       man page source for the POSIX wrapper API    doc/pcre.txt          plain text version of the man pages
317    doc/pcreposix.html    HTML version    doc/pcretest.txt      plain text documentation of test program
318    doc/pcreposix.txt     plain text version    doc/perltest.txt      plain text documentation of Perl test program
   doc/pcretest.txt      documentation of test program  
   doc/perltest.txt      documentation of Perl test program  
   doc/pcregrep.1        man page source for the pcregrep utility  
   doc/pcregrep.html     HTML version  
   doc/pcregrep.txt      plain text version  
319    install-sh            a shell script for installing files    install-sh            a shell script for installing files
320    ltmain.sh             file used to build a libtool script    ltmain.sh             file used to build a libtool script
321    pcretest.c            comprehensive test program    pcretest.c            comprehensive test program
322    pcredemo.c            simple demonstration of coding calls to PCRE    pcredemo.c            simple demonstration of coding calls to PCRE
323    perltest              Perl test program    perltest              Perl test program
   perltest8             Perl test program for UTF-8 tests  
324    pcregrep.c            source of a grep utility that uses PCRE    pcregrep.c            source of a grep utility that uses PCRE
325    pcre-config.in        source of script which retains PCRE information    pcre-config.in        source of script which retains PCRE information
326    testdata/testinput1   test data, compatible with Perl 5.004 and 5.005    testdata/testinput1   test data, compatible with Perl
327    testdata/testinput2   test data for error messages and non-Perl things    testdata/testinput2   test data for error messages and non-Perl things
328    testdata/testinput3   test data, compatible with Perl 5.005    testdata/testinput3   test data for locale-specific tests
329    testdata/testinput4   test data for locale-specific tests    testdata/testinput4   test data for UTF-8 tests compatible with Perl
330    testdata/testinput5   test data for UTF-8 tests compatible with Perl 5.6    testdata/testinput5   test data for other UTF-8 tests
   testdata/testinput6   test data for other UTF-8 tests  
331    testdata/testoutput1  test results corresponding to testinput1    testdata/testoutput1  test results corresponding to testinput1
332    testdata/testoutput2  test results corresponding to testinput2    testdata/testoutput2  test results corresponding to testinput2
333    testdata/testoutput3  test results corresponding to testinput3    testdata/testoutput3  test results corresponding to testinput3
334    testdata/testoutput4  test results corresponding to testinput4    testdata/testoutput4  test results corresponding to testinput4
335    testdata/testoutput5  test results corresponding to testinput5    testdata/testoutput5  test results corresponding to testinput5
   testdata/testoutput6  test results corresponding to testinput6  
336    
337  (C) Auxiliary files for Win32 DLL  (C) Auxiliary files for Win32 DLL
338    
339    dll.mk    dll.mk
340    pcre.def    pcre.def
341    
342    (D) Auxiliary file for VPASCAL
343    
344      makevp.bat
345    
346  Philip Hazel <ph10@cam.ac.uk>  Philip Hazel <ph10@cam.ac.uk>
347  August 2001  February 2003

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