iconv（）32位和Linux上的64位

Question

我有一些代碼在Linux上使用iconv（）來驗證字符串是否為UTF-8編碼。 我創建的轉換如下：

iconv_t c = iconv_open("UTF-8","UTF-8");

我像這樣運行iconv（）：

int status = iconv(c, &fromArray, (size_t*)&inSize, &toArray, (size_t*)&outSize);

然后，如果status不是-1，則我將字符串具有有效的UTF-8。

它可以在32位環境（最初開發和測試）中編譯並正常工作。 但是我現在有一個要求在64位環境中工作（我相信是Fedora 14的64位風格）。 當我對此進行編譯並進行測試時， status始終為-1並且在errno始終會收到EILSEQ錯誤，即使對於32位編譯器所說的相同字符串也可以。

有誰知道為什么會發生這種情況嗎？

Answer 1

最近遇到了同樣的問題。 轉換為（size_t *）更有可能是根本原因。 該問題甚至可以通過以下代碼輕松模擬：

cat >Makefile <<EOF
all: build test clean

clean:
    rm -f *.o core* t32 t64
test: build
    @echo ; echo "run_32bit version:" ; ./t32
    @echo ; echo "run_64bit version:" ; ./t64
build:
    g++ -m32 t.cpp -o t32 -Wall -O0 -g
    g++      t.cpp -o t64 -Wall -O0 -g
EOF

cat >t.cpp <<EOF
#include <errno.h>
#include <stdio.h>
#include <iconv.h>

char buff_toArray [BUFSIZ];
char buff_fromArray [] = \
"<TESTS_STRINGS>\
    <T_VERIFICATION_STRINGS/>\
</TESTS_STRINGS>";

void iconv_test ( const char* desc, size_t* size )
{
   printf ("%s = size[%zu]\n",desc, (*size) );
}

int main (int argc, char* argv[])
{

 char* toArray = &buff_toArray[0];
 char* fromArray = &buff_fromArray[0];

 const int inSize_const = 61;
 short inSize_short = (short) sizeof(buff_fromArray);
 int inSize_int = (int) sizeof(buff_fromArray);
 unsigned int inSize_uint = (unsigned int) sizeof(buff_fromArray);
 long inSize_long = (long) sizeof(buff_fromArray);
 long long inSize_llong = (long long) sizeof(buff_fromArray);
 size_t inSize_size_t = sizeof(buff_fromArray);

 printf ("fake iconv usage:\n");
 iconv_test((const char*) "inSize_const", (size_t*)&inSize_const);
 iconv_test((const char*) "inSize_short", (size_t*)&inSize_short);
 iconv_test((const char*) "inSize_int", (size_t*)&inSize_int);
 iconv_test((const char*) "inSize_uint", (size_t*)&inSize_uint);
 iconv_test((const char*) "inSize_long", (size_t*)&inSize_long);
 iconv_test((const char*) "inSize_llong", (size_t*)&inSize_llong);
 iconv_test((const char*) "inSize_size_t", &inSize_size_t);

 printf ("real iconv usage:\n");
 int inSize = sizeof(buff_fromArray);
 int outSize = sizeof(buff_toArray);

 iconv_t c = iconv_open("UTF-8","UTF-8");
 int status = iconv(c, &fromArray, (size_t*)&inSize, &toArray, (size_t*)&outSize);
 printf ("status=[%d], errno=[%d] \n", status, errno );

 printf ("result string:\n");
 for(size_t i = 0; i <= sizeof(buff_toArray); i++) { printf ("%c", buff_toArray[i]); }
 printf ("\n");

 int close_status =  iconv_close(c);
 printf ("close status=[%d], errno=[%d] \n", close_status, errno );

 return 0;
}
EOF