Regex problem

[Kotan]

Hi!

I tried to use the POSIX regular expression functions under cygwin, and 
I only got segmentation faults. My program is working fine under Linux, 
but dont run at all with cygwin. Maybe you can give me a hint, whats 
wrong or if it is a bug.

Here the source code:

-------------------
#include <sys/types.h>
#include <regex.h>
//#include <pcreposix.h>
#include <stdio.h>
#include <string.h>

#define NMATCH 10

const char s[] = "ssh://user:password@host.com:22";
const char regex[] = "ssh://(([a-z]+)(:(.+))?@)?([a-z.]+)(:([0-9]+))?";

int main(int argc, char *argv[])
{
  regex_t *preg;
  regmatch_t pmatch[NMATCH];
  int i;
  char buf[256];
  char *p;
   
  preg = NULL;

  printf("regcomp...");

  if( regcomp( preg, regex, REG_ICASE | REG_EXTENDED ) != 0 )
    {
      printf("regcomp error!\n");
      return 1;
    }
 
  printf("regexec...");
 
  if( regexec(preg, s, NMATCH, pmatch, 0) != 0 )
    {
      printf("regexec failed (no match?)! \n");
      return 1;
    }
 
  for(i=0; i < NMATCH; i++) {
    printf("%d: %d %d\n", i, pmatch[i].rm_so, pmatch[i].rm_eo);
    if( pmatch[i].rm_so != -1 )
      {
    p = s;
    memset(buf, 0, sizeof(buf));
    strncpy(buf, p + pmatch[i].rm_so, pmatch[i].rm_eo-pmatch[i].rm_so);
    printf("%s\n", buf);
      }
   
  }
 
  regfree(preg);
  return 0;
}
----------

I tried the normal regex POSIX functions and also the Perl-compatiable 
Regular Expressions POSIX emulation using the pcreposix header and 
library. However the result is always the same:

----
$ ./reex
Segmentation fault (core dumped)
----
Exception: STATUS_ACCESS_VIOLATION at eip=61075334
eax=00000007 ebx=0A0505E0 ecx=00000000 edx=00000000 esi=0022EE30 
edi=0A050730
ebp=0022EEB8 esp=0022EE10 program=D:\cygwin\home\Kotan\reex.exe, pid 
1696, threa
d main
cs=001B ds=0023 es=0023 fs=003B gs=0000 ss=0023
Stack trace:
Frame     Function  Args
0022EEB8  61075334  (00000000, 00403020, 00000003, 0022EEE8)
0022F068  6108DB9F  (00000001, 61784348, 0A0500A8, 0022F0C0)
0022F0A8  61005F34  (0022F0C0, 00E50000, 00000408, 7C98C1B0)
0022FF88  6100614B  (00000000, 00000000, 00000000, 00000000)
End of stack trace
-------
When I am debugging it with ddd, I find out, that the stack seems to be 
manipulated by the regcomp function somehow, that the segmenation fault 
happens in cygwin_split_path by accessing adress 0. I also did a strace, 
where I dont find anything useful, but I attached it, if you want to 
look at it too..
The function regcomp seems always to segfault even if the regex string 
is much simpler or even empty.

So any hints, what could be wrong?

regards
  Daniel


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