Exemplo n.º 1
0
int
main (int argc, char * argv[])
{
  if (argc == 1)
    {
      /* Display all the break opportunities in the input string.  */
      char *input = read_file (stdin);
      int length = strlen (input);
      char *breaks = malloc (length);
      int i;

      u8_possible_linebreaks ((uint8_t *) input, length, "UTF-8", breaks);

      for (i = 0; i < length; i++)
        {
          switch (breaks[i])
            {
            case UC_BREAK_POSSIBLE:
              /* U+2027 in UTF-8 encoding */
              putc (0xe2, stdout); putc (0x80, stdout); putc (0xa7, stdout);
              break;
            case UC_BREAK_MANDATORY:
              /* U+21B2 (or U+21B5) in UTF-8 encoding */
              putc (0xe2, stdout); putc (0x86, stdout); putc (0xb2, stdout);
              break;
            case UC_BREAK_PROHIBITED:
              break;
            default:
              abort ();
            }
          putc (input[i], stdout);
        }

      free (breaks);

      return 0;
    }
  else
    return 1;
}
Exemplo n.º 2
0
void
ulc_possible_linebreaks (const char *s, size_t n, const char *encoding,
                         char *p)
{
  if (n > 0)
    {
      if (is_utf8_encoding (encoding))
        u8_possible_linebreaks ((const uint8_t *) s, n, encoding, p);
      else
        {
          /* Convert the string to UTF-8 and build a translation table
             from offsets into s to offsets into the translated string.  */
          size_t *offsets = (size_t *) malloc (n * sizeof (size_t));

          if (offsets != NULL)
            {
              uint8_t *t;
              size_t m;

              t = u8_conv_from_encoding (encoding, iconveh_question_mark,
                                         s, n, offsets, NULL, &m);
              if (t != NULL)
                {
                  char *q = (char *) (m > 0 ? malloc (m) : NULL);

                  if (m == 0 || q != NULL)
                    {
                      size_t i;

                      /* Determine the possible line breaks of the UTF-8
                         string.  */
                      u8_possible_linebreaks (t, m, encoding, q);

                      /* Translate the result back to the original string.  */
                      memset (p, UC_BREAK_PROHIBITED, n);
                      for (i = 0; i < n; i++)
                        if (offsets[i] != (size_t)(-1))
                          p[i] = q[offsets[i]];

                      free (q);
                      free (t);
                      free (offsets);
                      return;
                    }
                  free (t);
                }
              free (offsets);
            }

          /* Impossible to convert.  */
#if C_CTYPE_ASCII
          if (is_all_ascii (s, n))
            {
              /* ASCII is a subset of UTF-8.  */
              u8_possible_linebreaks ((const uint8_t *) s, n, encoding, p);
              return;
            }
#endif
          /* We have a non-ASCII string and cannot convert it.
             Don't produce line breaks except those already present in the
             input string.  All we assume here is that the encoding is
             minimally ASCII compatible.  */
          {
            const char *s_end = s + n;
            while (s < s_end)
              {
                *p = (*s == '\n' ? UC_BREAK_MANDATORY : UC_BREAK_PROHIBITED);
                s++;
                p++;
              }
          }
        }
    }
}
Exemplo n.º 3
0
int
u8_width_linebreaks (const uint8_t *s, size_t n,
                     int width, int start_column, int at_end_columns,
                     const char *o, const char *encoding,
                     char *p)
{
  const uint8_t *s_end;
  char *last_p;
  int last_column;
  int piece_width;

  u8_possible_linebreaks (s, n, encoding, p);

  s_end = s + n;
  last_p = NULL;
  last_column = start_column;
  piece_width = 0;
  while (s < s_end)
    {
      ucs4_t uc;
      int count = u8_mbtouc_unsafe (&uc, s, s_end - s);

      /* Respect the override.  */
      if (o != NULL && *o != UC_BREAK_UNDEFINED)
        *p = *o;

      if (*p == UC_BREAK_POSSIBLE || *p == UC_BREAK_MANDATORY)
        {
          /* An atomic piece of text ends here.  */
          if (last_p != NULL && last_column + piece_width > width)
            {
              /* Insert a line break.  */
              *last_p = UC_BREAK_POSSIBLE;
              last_column = 0;
            }
        }

      if (*p == UC_BREAK_MANDATORY)
        {
          /* uc is a line break character.  */
          /* Start a new piece at column 0.  */
          last_p = NULL;
          last_column = 0;
          piece_width = 0;
        }
      else
        {
          /* uc is not a line break character.  */
          int w;

          if (*p == UC_BREAK_POSSIBLE)
            {
              /* Start a new piece.  */
              last_p = p;
              last_column += piece_width;
              piece_width = 0;
              /* No line break for the moment, may be turned into
                 UC_BREAK_POSSIBLE later, via last_p. */
            }

          *p = UC_BREAK_PROHIBITED;

          w = uc_width (uc, encoding);
          if (w >= 0) /* ignore control characters in the string */
            piece_width += w;
        }

      s += count;
      p += count;
      if (o != NULL)
        o += count;
    }

  /* The last atomic piece of text ends here.  */
  if (last_p != NULL && last_column + piece_width + at_end_columns > width)
    {
      /* Insert a line break.  */
      *last_p = UC_BREAK_POSSIBLE;
      last_column = 0;
    }

  return last_column + piece_width;
}