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Diffstat (limited to 'newlib/libc/iconv/lib/aliasesi.c')
| -rw-r--r-- | newlib/libc/iconv/lib/aliasesi.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/newlib/libc/iconv/lib/aliasesi.c b/newlib/libc/iconv/lib/aliasesi.c new file mode 100644 index 000000000..f94ac8fb9 --- /dev/null +++ b/newlib/libc/iconv/lib/aliasesi.c @@ -0,0 +1,212 @@ +/* + * 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; +} + |