string.c

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/************************************************************************/
/************************************************************************/

#include <GKlib.h>



/************************************************************************/
/************************************************************************/
char *gk_strchr_replace(char *str, char *fromlist, char *tolist)
{
  gk_idx_t i, j, k; 
  size_t len, fromlen, tolen;

  len     = strlen(str);
  fromlen = strlen(fromlist);
  tolen   = strlen(tolist);

  for (i=j=0; i<len; i++) {
    for (k=0; k<fromlen; k++) {
      if (str[i] == fromlist[k]) {
        if (k < tolen) 
          str[j++] = tolist[k];
        break;
      }
    }
    if (k == fromlen)
      str[j++] = str[i];
  }
  str[j] = '\0';

  return str;
}



/************************************************************************/
/************************************************************************/
int gk_strstr_replace(char *str, char *pattern, char *replacement, char *options,
      char **new_str)
{
  gk_idx_t i; 
  int j, rc, flags, global, nmatches;
  size_t len, rlen, nlen, offset, noffset;
  regex_t re;
  regmatch_t matches[10];

  
  /* Parse the options */
  flags = REG_EXTENDED;
  if (strchr(options, 'i') != NULL)
    flags = flags | REG_ICASE;
  global = (strchr(options, 'g') != NULL ? 1 : 0);


  /* Compile the regex */
  if ((rc = regcomp(&re, pattern, flags)) != 0) { 
    len = regerror(rc, &re, NULL, 0);
    *new_str = gk_cmalloc(len, "gk_strstr_replace: new_str");
    regerror(rc, &re, *new_str, len);
    return 0;
  }

  /* Prepare the output string */
  len = strlen(str);
  nlen = 2*len;
  noffset = 0;
  *new_str = gk_cmalloc(nlen+1, "gk_strstr_replace: new_str");


  /* Get into the matching-replacing loop */
  rlen = strlen(replacement);
  offset = 0;
  nmatches = 0;
  do {
    rc = regexec(&re, str+offset, 10, matches, 0);

    if (rc == REG_ESPACE) {
      gk_free((void **)new_str, LTERM);
      *new_str = gk_strdup("regexec ran out of memory.");
      regfree(&re);
      return 0;
    }
    else if (rc == REG_NOMATCH) {
      if (nlen-noffset < len-offset) {
        nlen += (len-offset) - (nlen-noffset);
        *new_str = (char *)gk_realloc(*new_str, (nlen+1)*sizeof(char), "gk_strstr_replace: new_str");
      }
      strcpy(*new_str+noffset, str+offset);
      noffset += (len-offset);
      break;
    }
    else { /* A match was found! */
      nmatches++;

      /* Copy the left unmatched portion of the string */
      if (matches[0].rm_so > 0) {
        if (nlen-noffset < matches[0].rm_so) {
          nlen += matches[0].rm_so - (nlen-noffset);
          *new_str = (char *)gk_realloc(*new_str, (nlen+1)*sizeof(char), "gk_strstr_replace: new_str");
        }
        strncpy(*new_str+noffset, str+offset, matches[0].rm_so);
        noffset += matches[0].rm_so;
      }

      /* Go and append the replacement string */
      for (i=0; i<rlen; i++) {
        switch (replacement[i]) {
          case '\\':
            if (i+1 < rlen) {
              if (nlen-noffset < 1) {
                nlen += nlen + 1;
                *new_str = (char *)gk_realloc(*new_str, (nlen+1)*sizeof(char), "gk_strstr_replace: new_str");
              }
              *new_str[noffset++] = replacement[++i];
            }
            else {
              gk_free((void **)new_str, LTERM);
              *new_str = gk_strdup("Error in replacement string. Missing character following '\'.");
              regfree(&re);
              return 0;
            }
            break;

          case '$':
            if (i+1 < rlen) {
              j = (int)(replacement[++i] - '0');
              if (j < 0 || j > 9) {
                gk_free((void **)new_str, LTERM);
                *new_str = gk_strdup("Error in captured subexpression specification.");
                regfree(&re);
                return 0;
              }

              if (nlen-noffset < matches[j].rm_eo-matches[j].rm_so) {
                nlen += nlen + (matches[j].rm_eo-matches[j].rm_so);
                *new_str = (char *)gk_realloc(*new_str, (nlen+1)*sizeof(char), "gk_strstr_replace: new_str");
              }

              strncpy(*new_str+noffset, str+offset+matches[j].rm_so, matches[j].rm_eo);
              noffset += matches[j].rm_eo-matches[j].rm_so;
            }
            else {
              gk_free((void **)new_str, LTERM);
              *new_str = gk_strdup("Error in replacement string. Missing subexpression number folloing '$'.");
              regfree(&re);
              return 0;
            }
            break;

          default:
            if (nlen-noffset < 1) {
              nlen += nlen + 1;
              *new_str = (char *)gk_realloc(*new_str, (nlen+1)*sizeof(char), "gk_strstr_replace: new_str");
            }
            (*new_str)[noffset++] = replacement[i];
        }
      }

      /* Update the offset of str for the next match */
      offset += matches[0].rm_eo;

      if (!global) {
        /* Copy the right portion of the string if no 'g' option */
        if (nlen-noffset < len-offset) {
          nlen += (len-offset) - (nlen-noffset);
          *new_str = (char *)gk_realloc(*new_str, (nlen+1)*sizeof(char), "gk_strstr_replace: new_str");
        }
        strcpy(*new_str+noffset, str+offset);
        noffset += (len-offset);
      }
    }
  } while (global);

  (*new_str)[noffset] = '\0';

  regfree(&re);
  return nmatches + 1;

}



/************************************************************************/
/*************************************************************************/
char *gk_strtprune(char *str, char *rmlist)
{
  gk_idx_t i, j;
  size_t len;

  len = strlen(rmlist);

  for (i=strlen(str)-1; i>=0; i--) {
    for (j=0; j<len; j++) {
      if (str[i] == rmlist[j])
        break;
    }
    if (j == len)
      break;
  }

  str[i+1] = '\0';

  return str;
}


/************************************************************************/
/*************************************************************************/
char *gk_strhprune(char *str, char *rmlist)
{
  gk_idx_t i, j;
  size_t len;

  len = strlen(rmlist);

  for (i=0; str[i]; i++) {
    for (j=0; j<len; j++) {
      if (str[i] == rmlist[j])
        break;
    }
    if (j == len)
      break;
  }

  if (i>0) { /* If something needs to be removed */
    for (j=0; str[i]; i++, j++)
      str[j] = str[i];
    str[j] = '\0';
  }

  return str;
}


/************************************************************************/
/*************************************************************************/
char *gk_strtoupper(char *str)
{
  int i;

  for (i=0; str[i]!='\0'; str[i]=toupper(str[i]), i++); 
  return str;
}


/************************************************************************/
/*************************************************************************/
char *gk_strtolower(char *str)
{
  int i;

  for (i=0; str[i]!='\0'; str[i]=tolower(str[i]), i++); 
  return str;
}


/************************************************************************/
/*************************************************************************/
char *gk_strdup(char *orgstr)
{
  int len;
  char *str=NULL;

  if (orgstr != NULL) {
    len = strlen(orgstr)+1;
    str = gk_malloc(len*sizeof(char), "gk_strdup: str");
    strcpy(str, orgstr);
  }

  return str;
}


/************************************************************************/
/*************************************************************************/
int gk_strcasecmp(char *s1, char *s2)
{
  int i=0;

  if (strlen(s1) != strlen(s2))
    return 0;

  while (s1[i] != '\0') {
    if (tolower(s1[i]) != tolower(s2[i]))
      return 0;
    i++;
  }

  return 1;
}


/************************************************************************/
/*************************************************************************/
int gk_strrcmp(char *s1, char *s2)
{
  int i1 = strlen(s1)-1;
  int i2 = strlen(s2)-1;

  while ((i1 >= 0) && (i2 >= 0)) {
    if (s1[i1] != s2[i2])
      return (s1[i1] - s2[i2]);
    i1--;
    i2--;
  }

  /* i1 == -1 and/or i2 == -1 */

  if (i1 < i2)
    return -1;
  if (i1 > i2)
    return 1;
  return 0;
}



/************************************************************************/
/*************************************************************************/
char *gk_time2str(time_t time)
{
  static char datestr[128];
  struct tm *tm;

  tm = localtime(&time);

  if (strftime(datestr, 128, "%m/%d/%Y %H:%M:%S", tm) == 0)
    return NULL;
  else
    return datestr;
}



#if !defined(WIN32) && !defined(__MINGW32__)
/************************************************************************/
/*************************************************************************/
time_t gk_str2time(char *str)
{
  struct tm time;
  time_t rtime;

  memset(&time, '\0', sizeof(time));
  
  if (strptime(str, "%m/%d/%Y %H:%M:%S", &time) == NULL)
    return -1;

  rtime = mktime(&time);
  return (rtime < 0 ? 0 : rtime);
}
#endif


/*************************************************************************
* This function returns the ID of a particular string based on the 
* supplied StringMap array
**************************************************************************/
int gk_GetStringID(gk_StringMap_t *strmap, char *key)
{
  int i;

  for (i=0; strmap[i].name; i++) {
    if (gk_strcasecmp(key, strmap[i].name))
      return strmap[i].id;
  }

  return -1;
}