#include <stdlib.h>
#include <strings.h> /* rindex strlen */
#include <string.h> /* rindex strlen */
#include <stdio.h>

#define xmalloc malloc

char *logfile;
char *indfile;

void test(const char *idxfile, int idxcount, int fsti) {
  
#define REPLACESUFFIXNAME(_fname_, _suffix_)		\
  if (!_fname_ && (idxcount - fsti > 0)) {		\
    char *extp = strrchr((const char *)idxfile, '.');	\
    int length =  strlen((const char *)idxfile);	\
    							\
    if ( extp )						\
      length -= strlen(extp);				\
    								\
    _fname_ = (char *)xmalloc(length + sizeof(_suffix_) + 1);		\
    (void)sprintf(_fname_, "%*.*s%s", length, length, idxfile, _suffix_); \
  }

  REPLACESUFFIXNAME(indfile, ".ind");
  REPLACESUFFIXNAME(logfile, ".ilg");

}

int main(int argc, char **argv) {
  int idxcount = 1;
  int fsti = 0;

  int i;
  for ( i = 1; i < argc; i++ ) {

    test(argv[i], idxcount, fsti);
    printf("%s=[%s]\n", "idxfile", argv[i]);
    printf("%s=[%s]\n", "indfile", indfile);    free(indfile);    indfile=NULL;
    printf("%s=[%s]\n", "logfile", logfile);    free(logfile);    logfile=NULL;
  }
}