/simpletypesystem/trunk

/*

Copyright (c) 2013-2014 Gustav Hartvigsson

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.

*/

#include "utils.h"

#include <string.h>

#include <stdlib.h>

#include <stdio.h>

#include <stdarg.h>

#include <time.h>

#include <wchar.h>

#include <locale.h>

char *

s_string_new (const char * s) {

  char * ret_val = strdup (s);

  return ret_val;

}

char *

s_string_new_fmt (const char * format, ...) {

  char * buffer = malloc (strlen (format) + 512);

  char * ret_val = NULL;

  va_list args;

  va_start(args, format);

  vsprintf (buffer, format, args);

  ret_val = (char *) strdup (buffer);

  va_end(args);

  free (buffer);

  return ret_val;

}

char *

s_string_new_with_len (const char * s, size_t len) {

  char * ret_val = malloc (len + 1);

  strncpy (ret_val, s, len);

  return ret_val;

}

char *

s_current_time (void) {

  char * ret_val = malloc (21);

  time_t t = time (NULL);

  strftime (ret_val, 21, "%F %T", localtime (&t));

  return ret_val;

}

char *

s_wstring_to_string (const wchar_t * ws) {

  size_t buflen;

  char * buffer;

  char * resized;

  size_t bufpos;

  mbstate_t mbstate;

  memset (&mbstate, 0, sizeof (mbstate));

  /* Save locale */

    char * saved_locale;

  {

    char * old_locale;

    size_t old_locale_len;

    old_locale = setlocale (LC_ALL, NULL);

    old_locale_len = strlen (old_locale) + 1;

    saved_locale = malloc (sizeof (char *) * old_locale_len);

    memcpy (saved_locale, old_locale, old_locale_len);

    /* set locale */

    setlocale (LC_ALL, "");

  }

  /* Thanks to Florian Philipp.

   * Thread: https://plus.google.com/u/0/+GustavHartvigsson/posts/4Wk7La1kWPP

   *

   * to avoid parsing the string twice, we allocate memory speculatively

   * with exponential growth. Then we shrink it at the end.

   *

   * Alternative:  use

   * const wchar_t* tmp = ws;

   * size_t buflen = wcsrtombs(NULL, &tmp, 0, mbstate);

   * buffer = malloc(buflen);

   * wcsrtombs(buffer, &ws, 0, mbstate);

   * return buffer;

   */

  for (buflen = 4, buffer = NULL, bufpos = 0; ws; buflen *= 2) {

    size_t converted;

    if(! (resized = realloc (buffer, buflen)))

      goto err;

    buffer = resized;

    if((converted = wcsrtombs (buffer + bufpos, &ws, buflen - bufpos, &mbstate))

       == (size_t) -1)

      goto err;

    bufpos += converted;

  }

  /* shrink buffer to actually required size */

  if (! (resized = realloc (buffer, bufpos + 1)))

    goto err;

  /* reset locale */

  setlocale (LC_ALL, saved_locale);

  return resized;

err:

  /* reset locale */

  setlocale (LC_ALL, saved_locale);

  free(buffer);

  return NULL;

}