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-rw-r--r--lib/striconveha.c348
1 files changed, 348 insertions, 0 deletions
diff --git a/lib/striconveha.c b/lib/striconveha.c
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--- /dev/null
+++ b/lib/striconveha.c
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+/* Character set conversion with error handling and autodetection.
+ Copyright (C) 2002, 2005, 2007, 2009 Free Software Foundation, Inc.
+ Written by Bruno Haible.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+/* Specification. */
+#include "striconveha.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "malloca.h"
+#include "c-strcase.h"
+#include "striconveh.h"
+
+#define SIZEOF(a) (sizeof(a)/sizeof(a[0]))
+
+
+/* Autodetection list. */
+
+struct autodetect_alias
+{
+ struct autodetect_alias *next;
+ const char *name;
+ const char * const *encodings_to_try;
+};
+
+static const char * const autodetect_utf8_try[] =
+{
+ /* Try UTF-8 first. There are very few ISO-8859-1 inputs that would
+ be valid UTF-8, but many UTF-8 inputs are valid ISO-8859-1. */
+ "UTF-8", "ISO-8859-1",
+ NULL
+};
+static const char * const autodetect_jp_try[] =
+{
+ /* Try 7-bit encoding first. If the input contains bytes >= 0x80,
+ it will fail.
+ Try EUC-JP next. Short SHIFT_JIS inputs may come out wrong. This
+ is unavoidable. People will condemn SHIFT_JIS.
+ If we tried SHIFT_JIS first, then some short EUC-JP inputs would
+ come out wrong, and people would condemn EUC-JP and Unix, which
+ would not be good.
+ Finally try SHIFT_JIS. */
+ "ISO-2022-JP-2", "EUC-JP", "SHIFT_JIS",
+ NULL
+};
+static const char * const autodetect_kr_try[] =
+{
+ /* Try 7-bit encoding first. If the input contains bytes >= 0x80,
+ it will fail.
+ Finally try EUC-KR. */
+ "ISO-2022-KR", "EUC-KR",
+ NULL
+};
+
+static struct autodetect_alias autodetect_predefined[] =
+{
+ { &autodetect_predefined[1], "autodetect_utf8", autodetect_utf8_try },
+ { &autodetect_predefined[2], "autodetect_jp", autodetect_jp_try },
+ { NULL, "autodetect_kr", autodetect_kr_try }
+};
+
+static struct autodetect_alias *autodetect_list = &autodetect_predefined[0];
+static struct autodetect_alias **autodetect_list_end =
+ &autodetect_predefined[SIZEOF(autodetect_predefined)-1].next;
+
+int
+uniconv_register_autodetect (const char *name,
+ const char * const *try_in_order)
+{
+ size_t namelen;
+ size_t listlen;
+ size_t memneed;
+ size_t i;
+ char *memory;
+ struct autodetect_alias *new_alias;
+ char *new_name;
+ const char **new_try_in_order;
+
+ /* The TRY_IN_ORDER list must not be empty. */
+ if (try_in_order[0] == NULL)
+ {
+ errno = EINVAL;
+ return -1;
+ }
+
+ /* We must deep-copy NAME and TRY_IN_ORDER, because they may be allocated
+ with dynamic extent. */
+ namelen = strlen (name) + 1;
+ memneed = sizeof (struct autodetect_alias) + namelen + sizeof (char *);
+ for (i = 0; try_in_order[i] != NULL; i++)
+ memneed += sizeof (char *) + strlen (try_in_order[i]) + 1;
+ listlen = i;
+
+ memory = (char *) malloc (memneed);
+ if (memory != NULL)
+ {
+ new_alias = (struct autodetect_alias *) memory;
+ memory += sizeof (struct autodetect_alias);
+
+ new_try_in_order = (const char **) memory;
+ memory += (listlen + 1) * sizeof (char *);
+
+ new_name = (char *) memory;
+ memcpy (new_name, name, namelen);
+ memory += namelen;
+
+ for (i = 0; i < listlen; i++)
+ {
+ size_t len = strlen (try_in_order[i]) + 1;
+ memcpy (memory, try_in_order[i], len);
+ new_try_in_order[i] = (const char *) memory;
+ memory += len;
+ }
+ new_try_in_order[i] = NULL;
+
+ /* Now insert the new alias. */
+ new_alias->name = new_name;
+ new_alias->encodings_to_try = new_try_in_order;
+ new_alias->next = NULL;
+ /* FIXME: Not multithread-safe. */
+ *autodetect_list_end = new_alias;
+ autodetect_list_end = &new_alias->next;
+ return 0;
+ }
+ else
+ {
+ errno = ENOMEM;
+ return -1;
+ }
+}
+
+/* Like mem_iconveha, except no handling of transliteration. */
+static int
+mem_iconveha_notranslit (const char *src, size_t srclen,
+ const char *from_codeset, const char *to_codeset,
+ enum iconv_ilseq_handler handler,
+ size_t *offsets,
+ char **resultp, size_t *lengthp)
+{
+ int retval = mem_iconveh (src, srclen, from_codeset, to_codeset, handler,
+ offsets, resultp, lengthp);
+ if (retval >= 0 || errno != EINVAL)
+ return retval;
+ else
+ {
+ struct autodetect_alias *alias;
+
+ /* Unsupported from_codeset or to_codeset. Check whether the caller
+ requested autodetection. */
+ for (alias = autodetect_list; alias != NULL; alias = alias->next)
+ if (strcmp (from_codeset, alias->name) == 0)
+ {
+ const char * const *encodings;
+
+ if (handler != iconveh_error)
+ {
+ /* First try all encodings without any forgiving. */
+ encodings = alias->encodings_to_try;
+ do
+ {
+ retval = mem_iconveha_notranslit (src, srclen,
+ *encodings, to_codeset,
+ iconveh_error, offsets,
+ resultp, lengthp);
+ if (!(retval < 0 && errno == EILSEQ))
+ return retval;
+ encodings++;
+ }
+ while (*encodings != NULL);
+ }
+
+ encodings = alias->encodings_to_try;
+ do
+ {
+ retval = mem_iconveha_notranslit (src, srclen,
+ *encodings, to_codeset,
+ handler, offsets,
+ resultp, lengthp);
+ if (!(retval < 0 && errno == EILSEQ))
+ return retval;
+ encodings++;
+ }
+ while (*encodings != NULL);
+
+ /* Return the last call's result. */
+ return -1;
+ }
+
+ /* It wasn't an autodetection name. */
+ errno = EINVAL;
+ return -1;
+ }
+}
+
+int
+mem_iconveha (const char *src, size_t srclen,
+ const char *from_codeset, const char *to_codeset,
+ bool transliterate,
+ enum iconv_ilseq_handler handler,
+ size_t *offsets,
+ char **resultp, size_t *lengthp)
+{
+ if (srclen == 0)
+ {
+ /* Nothing to convert. */
+ *lengthp = 0;
+ return 0;
+ }
+
+ /* When using GNU libc >= 2.2 or GNU libiconv >= 1.5,
+ we want to use transliteration. */
+#if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2) || __GLIBC__ > 2 || _LIBICONV_VERSION >= 0x0105
+ if (transliterate)
+ {
+ int retval;
+ size_t len = strlen (to_codeset);
+ char *to_codeset_suffixed = (char *) malloca (len + 10 + 1);
+ memcpy (to_codeset_suffixed, to_codeset, len);
+ memcpy (to_codeset_suffixed + len, "//TRANSLIT", 10 + 1);
+
+ retval = mem_iconveha_notranslit (src, srclen,
+ from_codeset, to_codeset_suffixed,
+ handler, offsets, resultp, lengthp);
+
+ freea (to_codeset_suffixed);
+
+ return retval;
+ }
+ else
+#endif
+ return mem_iconveha_notranslit (src, srclen,
+ from_codeset, to_codeset,
+ handler, offsets, resultp, lengthp);
+}
+
+/* Like str_iconveha, except no handling of transliteration. */
+static char *
+str_iconveha_notranslit (const char *src,
+ const char *from_codeset, const char *to_codeset,
+ enum iconv_ilseq_handler handler)
+{
+ char *result = str_iconveh (src, from_codeset, to_codeset, handler);
+
+ if (result != NULL || errno != EINVAL)
+ return result;
+ else
+ {
+ struct autodetect_alias *alias;
+
+ /* Unsupported from_codeset or to_codeset. Check whether the caller
+ requested autodetection. */
+ for (alias = autodetect_list; alias != NULL; alias = alias->next)
+ if (strcmp (from_codeset, alias->name) == 0)
+ {
+ const char * const *encodings;
+
+ if (handler != iconveh_error)
+ {
+ /* First try all encodings without any forgiving. */
+ encodings = alias->encodings_to_try;
+ do
+ {
+ result = str_iconveha_notranslit (src,
+ *encodings, to_codeset,
+ iconveh_error);
+ if (!(result == NULL && errno == EILSEQ))
+ return result;
+ encodings++;
+ }
+ while (*encodings != NULL);
+ }
+
+ encodings = alias->encodings_to_try;
+ do
+ {
+ result = str_iconveha_notranslit (src,
+ *encodings, to_codeset,
+ handler);
+ if (!(result == NULL && errno == EILSEQ))
+ return result;
+ encodings++;
+ }
+ while (*encodings != NULL);
+
+ /* Return the last call's result. */
+ return NULL;
+ }
+
+ /* It wasn't an autodetection name. */
+ errno = EINVAL;
+ return NULL;
+ }
+}
+
+char *
+str_iconveha (const char *src,
+ const char *from_codeset, const char *to_codeset,
+ bool transliterate,
+ enum iconv_ilseq_handler handler)
+{
+ if (*src == '\0' || c_strcasecmp (from_codeset, to_codeset) == 0)
+ {
+ char *result = strdup (src);
+
+ if (result == NULL)
+ errno = ENOMEM;
+ return result;
+ }
+
+ /* When using GNU libc >= 2.2 or GNU libiconv >= 1.5,
+ we want to use transliteration. */
+#if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2) || __GLIBC__ > 2 || _LIBICONV_VERSION >= 0x0105
+ if (transliterate)
+ {
+ char *result;
+ size_t len = strlen (to_codeset);
+ char *to_codeset_suffixed = (char *) malloca (len + 10 + 1);
+ memcpy (to_codeset_suffixed, to_codeset, len);
+ memcpy (to_codeset_suffixed + len, "//TRANSLIT", 10 + 1);
+
+ result = str_iconveha_notranslit (src, from_codeset, to_codeset_suffixed,
+ handler);
+
+ freea (to_codeset_suffixed);
+
+ return result;
+ }
+ else
+#endif
+ return str_iconveha_notranslit (src, from_codeset, to_codeset, handler);
+}
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