资源简介
This library provides an iconv() implementation, for use on systems which don't have one, or whose implementation cannot convert from/to Unicode.
代码片段和文件信息
/* Copyright (C) 1999-2001 2003 2011 Bruno Haible.
This file is not part of the GNU LIBICONV Library.
This file is put into the public domain. */
#include “iconv_string.h“
#include
#include
#include
#include
#define tmpbufsize 4096
int iconv_string (const char* tocode const char* fromcode
const char* start const char* end
char** resultp size_t* lengthp)
{
iconv_t cd = iconv_open(tocodefromcode);
size_t length;
char* result;
if (cd == (iconv_t)(-1)) {
if (errno != EINVAL)
return -1;
/* Unsupported fromcode or tocode. Check whether the caller requested
autodetection. */
if (!strcmp(fromcode“autodetect_utf8“)) {
int ret;
/* Try UTF-8 first. There are very few ISO-8859-1 inputs that would
be valid UTF-8 but many UTF-8 inputs are valid ISO-8859-1. */
ret = iconv_string(tocode“UTF-8“startendresultplengthp);
if (!(ret < 0 && errno == EILSEQ))
return ret;
ret = iconv_string(tocode“ISO-8859-1“startendresultplengthp);
return ret;
}
if (!strcmp(fromcode“autodetect_jp“)) {
int ret;
/* Try 7-bit encoding first. If the input contains bytes >= 0x80
it will fail. */
ret = iconv_string(tocode“ISO-2022-JP-2“startendresultplengthp);
if (!(ret < 0 && errno == EILSEQ))
return ret;
/* Try EUC-JP next. Short SHIFT_JIS inputs may come out wrong. This
is unavoidable. People will condemn SHIFT_JIS.
If we tried SHIFT_JIS first then some short EUC-JP inputs would
come out wrong and people would condemn EUC-JP and Unix which
would not be good. */
ret = iconv_string(tocode“EUC-JP“startendresultplengthp);
if (!(ret < 0 && errno == EILSEQ))
return ret;
/* Finally try SHIFT_JIS. */
ret = iconv_string(tocode“SHIFT_JIS“startendresultplengthp);
return ret;
}
if (!strcmp(fromcode“autodetect_kr“)) {
int ret;
/* Try 7-bit encoding first. If the input contains bytes >= 0x80
it will fail. */
ret = iconv_string(tocode“ISO-2022-KR“startendresultplengthp);
if (!(ret < 0 && errno == EILSEQ))
return ret;
/* Finally try EUC-KR. */
ret = iconv_string(tocode“EUC-KR“startendresultplengthp);
return ret;
}
errno = EINVAL;
return -1;
}
/* Determine the length we need. */
{
size_t count = 0;
char tmpbuf[tmpbufsize];
const char* inptr = start;
size_t insize = end-start;
while (insize > 0) {
char* outptr = tmpbuf;
size_t outsize = tmpbufsize;
size_t res = iconv(cd&inptr&insize&outptr&outsize);
if (res == (size_t)(-1) && errno != E2BIG) {
int saved_errno = (errno == EINVAL ? EILSEQ : errno);
iconv_close(cd);
errno = saved_errno;
return -1;
}
count += outptr-tmpbuf;
}
{
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