Using PCRE on ILE - regex

Question

I am trying to use the pcre library (from AIX) on IBM iseries.
It should be possible using PASE.
I installed the pcre library with the rpm provided by yips.
I tried to use it in c ile source, but i couldn't achieve it.
Exemples : yips, ibm, ibm redbook
I can't find the way to do it.
Here is what i have done so far.
#include <stdio.h>
#include <qp2shell2.h>
#include <qp2user.h>
#define JOB_CCSID 0
int main(int argc, char *argv[])
{
int rc;
QP2_ptr64_t id;
void *getpid_pase;
const QP2_arg_type_t signature[] = { QP2_ARG_END };
QP2_word_t result;
/*
* Call QP2SHELL2 to run the OS/400 PASE program
* /usr/lib/start32, which starts OS/400 PASE in
* 32-bit mode (and leaves it active on return)
*/
QP2SHELL2("/usr/lib/start32");
/*
* Qp2dlopen opens the global name space (rather than
* loading a new shared executable) when the first
* argument is a null pointer. Qp2dlsym locates the
* function descriptor for the OS/400 PASE getpid
* subroutine (exported by shared library libc.a)
*/
id = Qp2dlopen("/usr/lib/libpcre.a", QP2_RTLD_NOW, JOB_CCSID);
getpid_pase = Qp2dlsym(id, "pcrecpp::RE", JOB_CCSID, NULL);
//id = Qp2dlopen(NULL, QP2_RTLD_NOW, JOB_CCSID);
//getpid_pase = Qp2dlsym(id, "getpid", JOB_CCSID, NULL);
/*
* Call Qp2CallPase to run the OS/400 PASE getpid
* function, and print the result. Use Qp2errnop
* to find and print the OS/400 PASE errno if the
* function result was -1
*/
rc = Qp2CallPase(getpid_pase,
NULL, // no argument list
signature,
QP2_RESULT_WORD,
&result);
printf("OS/400 PASE getpid() = %i\n", result);
if (result == -1)
printf("OS/400 errno = %i\n", *Qp2errnop());
/*
* Close the Qp2dlopen instance, and then call
* Qp2EndPase to end OS/400 PASE in this job
*/
Qp2dlclose(id);
Qp2EndPase();
return 0;
}

Answer 1

Today I tried the same and I could compile pcre to ILE using CRTCMOD.
In the zip-file of pcre you can find a file named NON_AUTOTOOLS_BUILD (if I remember the name correctly) with with all information needed to compile it.
In fact you only need to:
edit config.h to match your environment (available functions like memmove, features like pthreads, EBCDIC support and NewLine=37 (x'25') )
compile dftables.c using CRTBNDC DEFINE(HAVE_CONFIG_H) ...
CALL DFTABLES to generate the character tables for EBCDIC (this step was a bit tricky, because it couldn't open the IFS-File for output. so I put the output in a source member and used CPYTOSTMF to get it in the IFS)
compile the all the .c files unsing CRTCMOD DEFINE(HAVE_CONFIG_H) ...
create a *SRVPGM from the modules
write the Prototypes for RPG
It works like a charm, except for a little problem with CCSIDs. I generated the chartables for CCSID 1141, but for some reason PCRE expects input to be CCSID 37.
Also note that, if you write the prototypes in RPG, pcre_free is special. This function is not implemented in PCRE (you could write your own and plug it in if you want) and defaults to free. Your prototype should look like
Dpcre_free PR EXTPROC('free')
D * value
*white spaces not accurate
Hope that helps