text: /*
   * bug_fix.c
   */
  #include <stdio.h>
  #include "oniguruma.h"
  
  static OnigCaseFoldType CF = ONIGENC_CASE_FOLD_MIN;
  
  static int
  search(regex_t* reg, unsigned char* str, unsigned char* end)
  {
    int r;
    unsigned char *start, *range;
    OnigRegion *region;
  
    region = onig_region_new();
  
    start = str;
    range = end;
    r = onig_search(reg, str, end, start, range, region, ONIG_OPTION_NONE);
    if (r >= 0) {
      int i;
  
      fprintf(stderr, "match at %d  (%s)\n", r,
              ONIGENC_NAME(onig_get_encoding(reg)));
      for (i = 0; i < region->num_regs; i++) {
        fprintf(stderr, "%d: (%d-%d)\n", i, region->beg[i], region->end[i]);
      }
    }
    else if (r == ONIG_MISMATCH) {
      fprintf(stderr, "search fail (%s)\n",
              ONIGENC_NAME(onig_get_encoding(reg)));
    }
    else { /* error */
      char s[ONIG_MAX_ERROR_MESSAGE_LEN];
      onig_error_code_to_str((UChar* )s, r);
      fprintf(stderr, "ERROR: %s\n", s);
      fprintf(stderr, "  (%s)\n", ONIGENC_NAME(onig_get_encoding(reg)));
      return -1;
    }
  
    onig_region_free(region, 1 /* 1:free self, 0:free contents only */);
    return 0;
  }
  
  static int
  exec_deluxe(OnigEncoding pattern_enc, OnigEncoding str_enc,
              OnigOptionType options, char* apattern, char* astr)
  {
    int r;
    unsigned char *end;
    regex_t* reg;
    OnigCompileInfo ci;
    OnigErrorInfo einfo;
    UChar* pattern = (UChar* )apattern;
    UChar* str     = (UChar* )astr;
  
    onig_initialize(&str_enc, 1);
  
    ci.num_of_elements = 5;
    ci.pattern_enc = pattern_enc;
    ci.target_enc  = str_enc;
    ci.syntax      = ONIG_SYNTAX_DEFAULT;
    ci.option      = options;
    ci.case_fold_flag  = CF;
  
    r = onig_new_deluxe(&reg, pattern,
                        pattern + onigenc_str_bytelen_null(pattern_enc, pattern),
                        &ci, &einfo);
    if (r != ONIG_NORMAL) {
      char s[ONIG_MAX_ERROR_MESSAGE_LEN];
      onig_error_code_to_str((UChar* )s, r, &einfo);
      fprintf(stderr, "ERROR: %s\n", s);
      return -1;
    }
  
    end = str + onigenc_str_bytelen_null(str_enc, str);
    r = search(reg, str, end);
  
    onig_free(reg);
    onig_end();
    return 0;
  }
  
  static int
  exec(OnigEncoding enc, OnigOptionType options, char* apattern, char* astr)
  {
    int r;
    unsigned char *end;
    regex_t* reg;
    OnigErrorInfo einfo;
    UChar* pattern = (UChar* )apattern;
    UChar* str     = (UChar* )astr;
  
    onig_initialize(&enc, 1);
  
    r = onig_new(&reg, pattern,
  	       pattern + onigenc_str_bytelen_null(enc, pattern),
  	       options, enc, ONIG_SYNTAX_DEFAULT, &einfo);
    if (r != ONIG_NORMAL) {
      char s[ONIG_MAX_ERROR_MESSAGE_LEN];
      onig_error_code_to_str((UChar* )s, r, &einfo);
      fprintf(stderr, "ERROR: %s\n", s);
      return -1;
    }
  
    end = str + onigenc_str_bytelen_null(enc, str);
    r = search(reg, str, end);
  
    onig_free(reg);
    onig_end();
    return 0;
  }
  
  
  
  extern int main(int argc, char* argv[])
  {
    /* fix ignore case in look-behind
       commit: 3340ec2cc5627172665303fe248c9793354d2251 */
    exec_deluxe(ONIG_ENCODING_UTF8, ONIG_ENCODING_UTF8,
                ONIG_OPTION_IGNORECASE,
                "(?<=\305\211)a", "\312\274na"); /* \u{0149}a  \u{02bc}na */
  
    exec(ONIG_ENCODING_UTF8, ONIG_OPTION_NONE, "(\\2)(\\1)", "aa"); /* fail. */
  
    exec(ONIG_ENCODING_UTF8, ONIG_OPTION_FIND_LONGEST,
         "a*", "aa aaa aaaa aaaaa "); /* match 12-17 */
  
    return 0;
  }
  