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/*
* Copyright (c) 2003-2004, Artem B. Bityuckiy
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <_ansi.h>
#include <reent.h>
#include <newlib.h>
#include <sys/types.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <ctype.h>
#include <sys/iconvnls.h>
#include "local.h"
/*
* strnstr - locate a substring in a fixed-size string.
*
* PARAMETERS:
* _CONST char *haystack - the string in which to search.
* _CONST char *needle - the string which to search.
* int length - the maximum 'haystack' string length.
*
* DESCRIPTION:
* The strstr() function finds the first occurrence of the substring
* 'needle' in the string 'haystack'. At most 'length' bytes are searched.
*
* RETURN:
* Returns a pointer to the beginning of substring, or NULL if substring
* was not found.
*/
static char *
_DEFUN(strnstr, (haystack, needle, length),
_CONST char *haystack _AND
_CONST char *needle _AND
int length)
{
_CONST char *max = haystack + length;
if (*haystack == '\0')
return *needle == '\0' ? (char *)haystack : (char *)NULL;
while (haystack < max)
{
int i = 0;
while (1)
{
if (needle[i] == '\0')
return (char *)haystack;
if (needle[i] != haystack[i])
break;
i += 1;
}
haystack += 1;
}
return (char *)NULL;
}
/*
* canonical_form - canonize 'str'.
*
* PARAMETERS:
* struct _reent *rptr - reent structure of current thread/process.
* _CONST char *str - string to canonize.
*
* DESCRIPTION:
* Converts all letters to small and substitute all '-' characters by '_'
* characters.
*
* RETURN:
* Returns canonical form of 'str' if success, NULL if failure.
*/
static _CONST char *
_DEFUN(canonical_form, (rptr, str),
struct _reent *rptr _AND
_CONST char *str)
{
char *p, *p1;
if (str == NULL || (p = p1 = _strdup_r (rptr, str)) == NULL)
return (_CONST char *)NULL;
for (; *str; str++, p++)
{
if (*str == '-')
*p = '_';
else
*p = tolower (*str);
}
return (_CONST char *)p1;
}
/*
* find_alias - find encoding name name by it's alias.
*
* PARAMETERS:
* struct _reent *rptr - reent structure of current thread/process.
* _CONST char *alias - alias by which "official" name should be found.
* _CONST char *table - aliases table.
* int len - aliases table length.
*
* DESCRIPTION:
* 'table' contains the list of encoding names and aliases.
* Names go first, e.g.:
*
* name1 alias11 alias12 alias1N
* name2 alias21 alias22 alias2N
* nameM aliasM1 aliasM2 aliasMN
*
* If line begins with backspace it is considered as the continuation of
* previous line.
*
* RETURN:
* Returns pointer to name found if success. In case of error returns NULL
* and sets current thread's/process's errno.
*/
static char *
_DEFUN(find_alias, (rptr, alias, table, len),
struct _reent *rptr _AND
_CONST char *alias _AND
_CONST char *table _AND
int len)
{
_CONST char *end;
_CONST char *p;
int l = strlen (alias);
_CONST char *ptable = table;
_CONST char *table_end = table + len;
if (table == NULL || alias == NULL || *table == '\0' || *alias == '\0')
return NULL;
search_again:
if (len < l || (p = strnstr (ptable, alias, len)) == NULL)
return NULL;
/* Check that substring is segregated by '\n', '\t' or ' ' */
if (!((p == table || isspace (*(p-1)) || *(p-1) == '\n')
&& (p+l == table_end || isspace (*(p+l)) || *(p+l) == '\n')))
{
ptable = p + l;
len -= table - p;
goto search_again;
}
while(--p > table && *p != '\n');
if (*(++p) == '#')
return NULL;
for (end = p + 1; !isspace (*end) && *end != '\n' && *end != '\0'; end++);
return _strndup_r (rptr, p, (size_t)(end - p));
}
/*
* _iconv_resolve_encoding_name - resolves encoding's name by given alias.
*
* PARAMETERS:
* struct _reent *rptr - reent structure of current thread/process.
* _CONST char *ca - encoding alias to resolve.
*
* DESCRIPTION:
* First, tries to find 'ca' among built-in aliases. If not found, tries to
* find it external file.
*
* RETURN:
* Encoding name if found. In case of error returns NULL
* and sets current thread's/process's errno.
*/
char *
_DEFUN(_iconv_resolve_encoding_name, (rptr, cname, path),
struct _reent *rptr _AND
_CONST char *ca)
{
char *p = (char *)ca;
/* Alias shouldn't contain white spaces, '\n' and '\r' symbols */
while (*p)
if (*p == ' ' || *p == '\r' || *p++ == '\n')
return NULL;
if ((ca = canonical_form (rptr, ca)) == NULL)
return NULL;
p = find_alias (rptr, ca, _iconv_aliases, strlen (_iconv_aliases));
_free_r (rptr, (_VOID_PTR)ca);
return p;
}
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