#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <unigbrk.h>
#include "libpspp/assertion.h"
#include "libpspp/hmapx.h"
#include "libpspp/str.h"
#include "libpspp/version.h"
+#include "gl/c-strcase.h"
#include "gl/localcharset.h"
#include "gl/xalloc.h"
#include "gl/relocatable.h"
return out.string;
}
+/* Returns the name of the encoding that should be used for file names.
+
+ This is meant to be the same encoding used by g_filename_from_uri() and
+ g_filename_to_uri() in GLib. */
+static const char *
+filename_encoding (void)
+{
+#if defined _WIN32 || defined __WIN32__
+ return "UTF-8";
+#else
+ return locale_charset ();
+#endif
+}
+
+static char *
+xconcat2 (const char *a, size_t a_len,
+ const char *b, size_t b_len)
+{
+ char *s = xmalloc (a_len + b_len + 1);
+ memcpy (s, a, a_len);
+ memcpy (s + a_len, b, b_len);
+ s[a_len + b_len] = '\0';
+ return s;
+}
+
+/* Conceptually, this function concatenates HEAD_LEN-byte string HEAD and
+ TAIL_LEN-byte string TAIL, both encoded in UTF-8, then converts them to
+ ENCODING. If the re-encoded result is no more than MAX_LEN bytes long, then
+ it returns HEAD_LEN. Otherwise, it drops one character[*] from the end of
+ HEAD and tries again, repeating as necessary until the concatenated result
+ fits or until HEAD_LEN reaches 0.
+
+ [*] Actually this function drops grapheme clusters instead of characters, so
+ that, e.g. a Unicode character followed by a combining accent character
+ is either completely included or completely excluded from HEAD_LEN. See
+ UAX #29 at http://unicode.org/reports/tr29/ for more information on
+ grapheme clusters.
+
+ A null ENCODING is treated as UTF-8.
+
+ Sometimes this function has to actually construct the concatenated string to
+ measure its length. When this happens, it sets *RESULTP to that
+ null-terminated string, allocated with malloc(), for the caller to use if it
+ needs it. Otherwise, it sets *RESULTP to NULL.
+
+ Simple examples for encoding="UTF-8", max_len=6:
+
+ head="abc", tail="xyz" => 3
+ head="abcd", tail="xyz" => 3 ("d" dropped).
+ head="abc", tail="uvwxyz" => 0 ("abc" dropped).
+ head="abc", tail="tuvwxyz" => 0 ("abc" dropped).
+
+ Examples for encoding="ISO-8859-1", max_len=6:
+
+ head="éèä", tail="xyz" => 6
+ (each letter in head is only 1 byte in ISO-8859-1 even though they
+ each take 2 bytes in UTF-8 encoding)
+*/
+static size_t
+utf8_encoding_concat__ (const char *head, size_t head_len,
+ const char *tail, size_t tail_len,
+ const char *encoding, size_t max_len,
+ char **resultp)
+{
+ *resultp = NULL;
+ if (head_len == 0)
+ return 0;
+ else if (encoding == NULL || !c_strcasecmp (encoding, "UTF-8"))
+ {
+ if (head_len + tail_len <= max_len)
+ return head_len;
+ else if (tail_len >= max_len)
+ return 0;
+ else
+ {
+ size_t copy_len;
+ size_t prev;
+ size_t ofs;
+ int mblen;
+
+ copy_len = 0;
+ for (ofs = u8_mbtouc (&prev, CHAR_CAST (const uint8_t *, head),
+ head_len);
+ ofs <= max_len - tail_len;
+ ofs += mblen)
+ {
+ ucs4_t next;
+
+ mblen = u8_mbtouc (&next,
+ CHAR_CAST (const uint8_t *, head + ofs),
+ head_len - ofs);
+ if (uc_is_grapheme_break (prev, next))
+ copy_len = ofs;
+
+ prev = next;
+ }
+
+ return copy_len;
+ }
+ }
+ else
+ {
+ char *result;
+
+ result = (tail_len > 0
+ ? xconcat2 (head, head_len, tail, tail_len)
+ : CONST_CAST (char *, head));
+ if (recode_string_len (encoding, "UTF-8", result,
+ head_len + tail_len) <= max_len)
+ {
+ *resultp = result != head ? result : NULL;
+ return head_len;
+ }
+ else
+ {
+ bool correct_result = false;
+ size_t copy_len;
+ size_t prev;
+ size_t ofs;
+ int mblen;
+
+ copy_len = 0;
+ for (ofs = u8_mbtouc (&prev, CHAR_CAST (const uint8_t *, head),
+ head_len);
+ ofs <= head_len;
+ ofs += mblen)
+ {
+ ucs4_t next;
+
+ mblen = u8_mbtouc (&next,
+ CHAR_CAST (const uint8_t *, head + ofs),
+ head_len - ofs);
+ if (uc_is_grapheme_break (prev, next))
+ {
+ if (result != head)
+ {
+ memcpy (result, head, ofs);
+ memcpy (result + ofs, tail, tail_len);
+ result[ofs + tail_len] = '\0';
+ }
+
+ if (recode_string_len (encoding, "UTF-8", result,
+ ofs + tail_len) <= max_len)
+ {
+ correct_result = true;
+ copy_len = ofs;
+ }
+ else
+ correct_result = false;
+ }
+
+ prev = next;
+ }
+
+ if (result != head)
+ {
+ if (correct_result)
+ *resultp = result;
+ else
+ free (result);
+ }
+
+ return copy_len;
+ }
+ }
+}
+
+/* Concatenates a prefix of HEAD with all of TAIL and returns the result as a
+ null-terminated string owned by the caller. HEAD, TAIL, and the returned
+ string are all encoded in UTF-8. As many characters[*] from the beginning
+ of HEAD are included as will fit within MAX_LEN bytes supposing that the
+ resulting string were to be re-encoded in ENCODING. All of TAIL is always
+ included, even if TAIL by itself is longer than MAX_LEN in ENCODING.
+
+ [*] Actually this function drops grapheme clusters instead of characters, so
+ that, e.g. a Unicode character followed by a combining accent character
+ is either completely included or completely excluded from the returned
+ string. See UAX #29 at http://unicode.org/reports/tr29/ for more
+ information on grapheme clusters.
+
+ A null ENCODING is treated as UTF-8.
+
+ Simple examples for encoding="UTF-8", max_len=6:
+
+ head="abc", tail="xyz" => "abcxyz"
+ head="abcd", tail="xyz" => "abcxyz"
+ head="abc", tail="uvwxyz" => "uvwxyz"
+ head="abc", tail="tuvwxyz" => "tuvwxyz"
+
+ Examples for encoding="ISO-8859-1", max_len=6:
+
+ head="éèä", tail="xyz" => "éèäxyz"
+ (each letter in HEAD is only 1 byte in ISO-8859-1 even though they
+ each take 2 bytes in UTF-8 encoding)
+*/
+char *
+utf8_encoding_concat (const char *head, const char *tail,
+ const char *encoding, size_t max_len)
+{
+ size_t tail_len = strlen (tail);
+ size_t prefix_len;
+ char *result;
+
+ prefix_len = utf8_encoding_concat__ (head, strlen (head), tail, tail_len,
+ encoding, max_len, &result);
+ return (result != NULL
+ ? result
+ : xconcat2 (head, prefix_len, tail, tail_len));
+}
+
+/* Returns the length, in bytes, of the string that would be returned by
+ utf8_encoding_concat() if passed the same arguments, but the implementation
+ is often more efficient. */
+size_t
+utf8_encoding_concat_len (const char *head, const char *tail,
+ const char *encoding, size_t max_len)
+{
+ size_t tail_len = strlen (tail);
+ size_t prefix_len;
+ char *result;
+
+ prefix_len = utf8_encoding_concat__ (head, strlen (head), tail, tail_len,
+ encoding, max_len, &result);
+ free (result);
+ return prefix_len + tail_len;
+}
+
+/* Returns an allocated, null-terminated string, owned by the caller,
+ containing as many characters[*] from the beginning of S that would fit
+ within MAX_LEN bytes if the returned string were to be re-encoded in
+ ENCODING. Both S and the returned string are encoded in UTF-8.
+
+ [*] Actually this function drops grapheme clusters instead of characters, so
+ that, e.g. a Unicode character followed by a combining accent character
+ is either completely included or completely excluded from the returned
+ string. See UAX #29 at http://unicode.org/reports/tr29/ for more
+ information on grapheme clusters.
+
+ A null ENCODING is treated as UTF-8.
+*/
+char *
+utf8_encoding_trunc (const char *s, const char *encoding, size_t max_len)
+{
+ return utf8_encoding_concat (s, "", encoding, max_len);
+}
+
+/* Returns the length, in bytes, of the string that would be returned by
+ utf8_encoding_trunc() if passed the same arguments, but the implementation
+ is often more efficient. */
+size_t
+utf8_encoding_trunc_len (const char *s, const char *encoding, size_t max_len)
+{
+ return utf8_encoding_concat_len (s, "", encoding, max_len);
+}
+
+/* Returns FILENAME converted from UTF-8 to the filename encoding.
+ On Windows the filename encoding is UTF-8; elsewhere it is based on the
+ current locale. */
+char *
+utf8_to_filename (const char *filename)
+{
+ return recode_string (filename_encoding (), "UTF-8", filename, -1);
+}
+
+/* Returns FILENAME converted from the filename encoding to UTF-8.
+ On Windows the filename encoding is UTF-8; elsewhere it is based on the
+ current locale. */
+char *
+filename_to_utf8 (const char *filename)
+{
+ return recode_string ("UTF-8", filename_encoding (), filename, -1);
+}
+
/* Converts the string TEXT, which should be encoded in FROM-encoding, to a
dynamically allocated string in TO-encoding. Any characters which cannot be
converted will be represented by '?'.
hmapx_init (&map);
}
-
const char *
get_default_encoding (void)
{
projects / pspp-builds.git / blobdiff