linux c字符集转换代码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <iconv.h>

int convert(const char *from_charset, const char *to_charset, char *inbuf, size_t inlen, char *outbuf, size_t outlen) {
    iconv_t cd = iconv_open(to_charset, from_charset);
    if (cd == (iconv_t)-1) {
        perror("iconv_open");
        return -1;
    }

    char *inptr = inbuf;
    char *outptr = outbuf;
    size_t inbytesleft = inlen;
    size_t outbytesleft = outlen;

    size_t ret = iconv(cd, &inptr, &inbytesleft, &outptr, &outbytesleft);
    if (ret == (size_t)-1) {
        perror("iconv");
        iconv_close(cd);
        return -1;
    }

    iconv_close(cd);
    return 0;
}

int main() {
    const char *utf8_str = "你好，世界！";
    size_t utf8_len = strlen(utf8_str);

    char gbk_buf[100];
    memset(gbk_buf, 0, sizeof(gbk_buf));

    if (convert("UTF-8", "GBK", (char *)utf8_str, utf8_len, gbk_buf, sizeof(gbk_buf)) == 0) {
        printf("Converted string: %s\n", gbk_buf);
    } else {
        printf("Conversion failed.\n");
    }

    return 0;
}