| /* |
| * 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; |
| } |
| |