311 lines
9.1 KiB
C
311 lines
9.1 KiB
C
/*
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* Copyright (c) 2003, Artem B. Bityuckiy, SoftMine Corporation.
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* Rights transferred to Franklin Electronic Publishers.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <reent.h>
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#include "local.h"
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/*
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* strnstr - locate a substring in a fixed-size string.
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*
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* PARAMETERS:
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* _CONST char *haystack - the string in which to search.
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* _CONST char *needle - the string which to search.
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* int length - the maximum 'haystack' string length.
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*
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* DESCRIPTION:
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* The strstr() function finds the first occurrence of the substring
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* 'needle'in the string 'haystack'. At most 'length' bytes is searched.
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*
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* RETURN:
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* Returns a pointer to the beginning of the substring, or NULL if the
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* substring was not found.
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*/
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static char *
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_DEFUN(strnstr, (haystack, needle, length),
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_CONST char *haystack _AND
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_CONST char *needle _AND
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int length)
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{
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int i;
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_CONST char *max = haystack + length;
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if (*haystack == '\0')
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return *needle == '\0' ? (char *)haystack : NULL;
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while (haystack < max)
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{
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i = 0;
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while (1)
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{
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if (needle[i] == '\0')
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return (char *)haystack;
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if (needle[i] != haystack[i++])
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break;
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}
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haystack += 1;
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}
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return (char *)NULL;
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}
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/*
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* canonical_form - canonize 'str'.
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*
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* PARAMETERS:
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* struct _reent *rptr - reent structure of curent thread/process.
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* _CONST char *str - string to canonize.
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*
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* DESCRIPTION:
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* Converts all letters to small and substitute all '-' by '_'.
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*
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* RETURN:
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* Returns canonical form of 'str' if success, NULL if failure.
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*/
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static _CONST char *
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_DEFUN(canonical_form, (rptr, str),
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struct _reent *rptr _AND
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_CONST char *str)
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{
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char *p, *p1;
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if (str == NULL || (p = p1 = _strdup_r(rptr, str)) == NULL)
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return NULL;
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for (; *str; str++, p++)
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{
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if (*str == '-')
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*p = '_';
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else
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*p = tolower(*str);
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}
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return (_CONST char *)p1;
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}
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/*
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* find_alias - find "official" name by alias.
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*
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* PARAMETERS:
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* struct _reent *rptr - reent structure of curent thread/process.
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* _CONST char *alias - alias by which "official" name should be found.
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* _CONST char *table - aliases table.
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* int len - aliases table length.
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*
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* DESCRIPTION:
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* 'table' contains the list of names and their aliases. "Official"
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* names go first, e.g.:
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*
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* Official_name1 alias11 alias12 alias1N
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* Official_name2 alias21 alias22 alias2N
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* Official_nameM aliasM1 aliasM2 aliasMN
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*
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* If line begins with backspace it is considered as the continuation of
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* previous line.
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*
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* RETURN:
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* Returns pointer to "official" name if success, NULL if failure.
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*/
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static _CONST char *
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_DEFUN(find_alias, (rptr, alias, table, len),
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struct _reent *rptr _AND
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_CONST char *alias _AND
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_CONST char *table _AND
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int len)
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{
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_CONST char *end;
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_CONST char *p;
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_CONST char *candidate;
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int l = strlen(alias);
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_CONST char *ptable = table;
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_CONST char *table_end = table + len;
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if (table == NULL || alias == NULL || *table == '\0' || *alias == '\0')
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return NULL;
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search_again:
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if (len < l)
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return NULL;
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if ((p = strnstr(ptable, alias, len)) == NULL)
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return NULL;
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/* Check that substring is segregated by '\n', '\t' or ' ' */
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if (!((p == table || *(p-1) == ' ' || *(p-1) == '\n' || *(p-1) == '\t') &&
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(p+l == table_end || *(p+l) == ' ' || *(p+l) == '\n' || *(p+l) == '\t')))
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{
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ptable = p + l;
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len -= table - p;
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goto search_again;
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}
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while(!(--p < table || (*p == '\n' && *(p+1) != ' ' && *(p+1) != '\t')));
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if (*(++p) == '#')
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return NULL;
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for (end = p + 1; *end != '\t' && *end != ' ' && *end != '\n' && *end != '\0'; end++);
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return _strndup_r(rptr, p, (size_t)(end - p));
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}
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/*
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* _iconv_construct_filename -- constructs full file name from it's
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* path and name
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*
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* PARAMETERS:
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* struct _reent *rptr - reent structure of current thread/process.
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* _CONST char *path - path to file.
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* _CONST char *file - the name of file.
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*
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* DESCRIPTION:
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* Function concatenates 'path' and 'file'.
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* 'path' and 'name' shouldn't be NULL.
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*
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* RETURN:
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* The pointer to full file name if success, NULL if faulture.
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*/
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char *
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_DEFUN(_iconv_construct_filename, (rptr, path, file),
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struct _reent *rptr _AND
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_CONST char *path _AND
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_CONST char *file)
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{
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int len1, len2;
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char *fname;
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if (path == NULL || file == NULL)
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return NULL;
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len1 = strlen(path);
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len2 = strlen(file);
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if ((fname = _malloc_r(rptr, len1 + len2 + 2 /* '/' + '\0' */)) == NULL)
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return NULL;
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memcpy(fname, path, len1);
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if (fname[len1 - 1] != '/')
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fname[len1++] = '/';
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memcpy(fname + len1, file, len2);
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fname[len1 + len2] = '\0';
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return fname;
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}
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/*
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* _iconv_resolve_alias - resolves "official" name by given alias.
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*
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* PARAMETERS:
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* struct _reent *rptr - reent structure of curent thread/process.
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* _CONST char *alias - alias to resolve.
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* _CONST char *bialiases - aliases table.
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* int cf - canonize flag.
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* _CONST char *fname - name of external file with list uf aliases.
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*
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* DESCRIPTION:
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* Tries to find 'alias' in aliases list ('bialiases'). If not
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* found, searches at 'fname' file. 'cf' flag shows if 'alias' should be
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* canonized before searching. Both 'bialiases' and 'fname' can't be NULL
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* pointers.
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*
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* RETURN:
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* Returns pointer to name found if success, NULL if failure.
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*/
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char *
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_DEFUN(_iconv_resolve_alias, (rptr, alias, bialiases, cf, fname),
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struct _reent *rptr _AND
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_CONST char *alias _AND
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_CONST char *bialiases _AND
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int cf _AND
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_CONST char *fname)
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{
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_CONST char *name = alias;
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_CONST char *ptr = alias;
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_CONST char *table;
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_iconv_fd_t desc;
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/* Alias shouldn't contain whitespaces, '\n' and '\r' symbols */
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while (*ptr)
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if (*ptr == ' ' || *ptr == '\r' || *ptr++ == '\n')
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return NULL;
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if (cf && (name = canonical_form(rptr, alias)) == NULL)
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return NULL;
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if ((alias = find_alias(rptr, name, (char *)bialiases,
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strlen(bialiases))) != NULL)
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goto free_and_return;
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if (_iconv_load_file(rptr, fname, &desc) != 0)
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goto free_and_return;
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alias = find_alias(rptr, name, desc.mem, desc.len);
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close_free_and_return:
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_iconv_unload_file(rptr, &desc);
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free_and_return:
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if (cf)
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_free_r(rptr, (_VOID_PTR)name);
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return (char*)alias;
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}
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/*
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* _iconv_resolve_cs_name - resolves convrter's "official" name by given alias.
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*
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* PARAMETERS:
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* struct _reent *rptr - reent structure of curent thread/process.
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* _CONST char *cs - charset alias to resolve.
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* _CONST char *path - external file with aliases list.
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*
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* DESCRIPTION:
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* First, tries to find 'cs' among built-in aliases. If not fount, tries to
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* find it external file.
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*
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* RETURN: Official name if found, NULL else.
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*/
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char *
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_DEFUN(_iconv_resolve_cs_name, (rptr, cs, path),
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struct _reent *rptr _AND
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_CONST char *cs _AND
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_CONST char *path)
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{
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char *fname, *p;
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if (path == NULL || *path == (_CONST char)0)
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if ((path = _getenv_r(rptr, "NLSPATH")) == NULL || *path == '\0')
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path = NLS_DEFAULT_NLSPATH;
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fname = _iconv_construct_filename(rptr, path, ICONV_ALIASES_FNAME);
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if (fname == NULL)
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return NULL;
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p = (char *)_iconv_resolve_alias(rptr, cs, _iconv_builtin_aliases,
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1, (_CONST char *)fname);
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if (fname != NULL)
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_free_r(rptr, (_VOID_PTR)fname);
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return p;
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}
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