diff options
Diffstat (limited to 'newlib/libc/iconv/lib/aliases.c')
| -rw-r--r-- | newlib/libc/iconv/lib/aliases.c | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/newlib/libc/iconv/lib/aliases.c b/newlib/libc/iconv/lib/aliases.c new file mode 100644 index 000000000..5ef2a6cca --- /dev/null +++ b/newlib/libc/iconv/lib/aliases.c @@ -0,0 +1,315 @@ +/* + * Copyright (c) 2003, Artem B. Bityuckiy, SoftMine Corporation. + * Rights transferred to Franklin Electronic Publishers. + * + * 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. + */ +#if defined(ENABLE_ICONV) + +#include <_ansi.h> +#include <string.h> +#include <stdlib.h> +#include <reent.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 'searchee' string length. + * + * DESCRIPTION: + * The strstr() function finds the first occurrence of the substring + * 'needle'in the string 'haystack'. At most 'length' bytes is searched. + * + * RETURN: + * Returns a pointer to the beginning of the substring, or NULL if the + * substring is not found. + */ +static char * +_DEFUN(strnstr, (haystack, needle, length), + _CONST char *haystack _AND + _CONST char *needle _AND + int length) +{ + int i; + _CONST char *max = haystack + length; + + if (*haystack == '\0') + return *needle == '\0' ? (char *)haystack : NULL; + + while (haystack < max) + { + i = 0; + while (1) + { + if (needle[i] == '\0') + return (char *)haystack; + if (needle[i] != haystack[i++]) + break; + } + haystack += 1; + } + return (char *)NULL; +} + +/* + * canonical_form - canonize 'str'. + * + * PARAMETERS: + * struct _reent *rptr - reent structure of curent thread/process. + * _CONST char *str - string to canonize. + * + * DESCRIPTION: + * Convert all letters to small and substitute all '-' by '_'. + * + * 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 NULL; + + for (; *str; str++, p++) + { + if (*str == '-') + *p = '_'; + else + *p = tolower(*str); + } + + return (_CONST char *)p1; +} + +/* + * find_alias - find "official" name by alias. + * + * PARAMETERS: + * struct _reent *rptr - reent structure of curent thread/process. + * _CONST char *alias - alias by which "official" name should be found. + * char *table - alias table. + * int len - alias table length. + * + * DESCRIPTION: + * 'table' contains the list of that names and their aliases. "Official" + * names go first, e.g.: + * + * Official_name1 alias11 alias12 alias1N + * Official_name2 alias21 alias22 alias2N + * Official_nameM aliasM1 aliasM2 aliasMN + * + * If line begins with backspace it is considered as the continuation of + * previous line. + * + * RETURN: + * Returns pointer to name "official" if success, NULL if failure. + */ +static _CONST 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; + _CONST char *candidate; + 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) + return NULL; + + if ((p = strnstr(ptable, alias, len)) == NULL) + return NULL; + + /* Check that substring is segregated by '\n', '\t' or ' ' */ + if (!((p == table || *(p-1) == ' ' || *(p-1) == '\n' || *(p-1) == '\t') && + (p+l == table_end || *(p+l) == ' ' || *(p+l) == '\n' || *(p+l) == '\t'))) + { + ptable = p + l; + len -= table - p; + goto search_again; + } + + while(!(--p < table || (*p == '\n' && *(p+1) != ' ' && *(p+1) != '\t'))); + + if (*(++p) == '#') + return NULL; + + for (end = p + 1; *end != '\t' && *end != ' ' && *end != '\n' && *end != '\0'; end++); + + return _strndup_r(rptr, p, (size_t)(end - p)); +} + +/* + * _iconv_construct_filename -- constructs file name string from it's + * path and name + * + * PARAMETERS: + * struct _reent *rptr - reent structure of current thread/process. + * _CONST char *path - path to file. + * _CONST char *file - the name of file. + * + * DESCRIPTION: + * Function concatenates 'path' and 'file'. + * 'path' and 'name' shouldn't be NULL. + * + * RETURN: + * The pointer to file path if success, NULL else. + */ +char * +_DEFUN(_iconv_construct_filename, (rptr, path, file), + struct _reent *rptr _AND + _CONST char *path _AND + _CONST char *file) +{ + int len1, len2; + char *fname; + + if (path == NULL || file == NULL) + return NULL; + + len1 = strlen(path); + len2 = strlen(file); + + if ((fname = _malloc_r(rptr, len1 + len2 + 2 /* '/' + '\0' */)) == NULL) + return NULL; + + memcpy(fname, path, len1); + if (fname[len1 - 1] != '/') + fname[len1++] = '/'; + memcpy(fname + len1, file, len2); + fname[len1 + len2] = '\0'; + + return fname; +} + +/* + * _iconv_resolve_alias - resolves charset's name by given alias. + * + * PARAMETERS: + * struct _reent *rptr - reent structure of curent thread/process. + * _CONST char *alias - alias to resolve. + * _CONST char *bialiases - built-in aliases table. + * int cf - canonize flag. + * _CONST char *fname - external file with aliases list. + * + * DESCRIPTION: + * Tries to find 'alias' in built-in aliases list ('bialiases'). If not + * found, searches at 'fname' file. 'cf' flag shows if 'alias' should be + * canonized before searching. Both 'bialiases' and 'fname' can be NULL + * pointers. + * + * RETURN: + * Returns pointer to name found if success, NULL if failure. + */ +char * +_DEFUN(_iconv_resolve_alias, (rptr, alias, bialiases, cf, fname), + struct _reent *rptr _AND + _CONST char *alias _AND + _CONST char *bialiases _AND + int cf _AND + _CONST char *fname) +{ + _CONST char *name = alias; + _CONST char *ptr = alias; + _CONST char *table; + _iconv_fd_t desc; + + /* Alias shouldn't contain whitespaces, '\n' and '\r' symbols */ + while (*ptr) + if (*ptr == ' ' || *ptr == '\r' || *ptr++ == '\n') + return NULL; + + if (cf && (name = canonical_form(rptr, alias)) == NULL) + return NULL; + + if ((alias = find_alias(rptr, name, (char *)bialiases, + strlen(bialiases))) != NULL) + goto free_and_return; + + if (_iconv_load_file(rptr, fname, &desc) != 0) + goto free_and_return; + + alias = find_alias(rptr, name, desc.mem, desc.len); + +close_free_and_return: + _iconv_unload_file(rptr, &desc); +free_and_return: + if (cf) + _free_r(rptr, (_VOID_PTR)name); + return (char*)alias; +} + +/* + * _iconv_resolve_cs_name - resolves charset by given alias. + * + * PARAMETERS: + * struct _reent *rptr - reent structure of curent thread/process. + * _CONST char *cs - charset alias to resolve. + * _CONST char *path - external file with aliases list. + * + * DESCRIPTION: + * First, tries to find 'cs' among built-in aliases. If not fount, tries to + * find it external file. + * + * RETURN: Official name if found, NULL else. + */ +char * +_DEFUN(_iconv_resolve_cs_name, (rptr, cs, path), + struct _reent *rptr _AND + _CONST char *cs _AND + _CONST char *path) +{ + char *fname, *p; + + if (path == NULL || *path == (_CONST char)0) + if ((path = _getenv_r(rptr, "NLSPATH")) == NULL || *path == '\0') + path = NLS_DEFAULT_NLSPATH; + + fname = _iconv_construct_filename(rptr, path, ICONV_ALIASES_FNAME); + if (fname == NULL) + return NULL; + + p = (char *)_iconv_resolve_alias(rptr, cs, iconv_builtin_aliases, + 1, (_CONST char *)fname); + if (fname != NULL) + _free_r(rptr, (_VOID_PTR)fname); + return p; +} + +#endif /* #if defined(ENABLE_ICONV) */ + |