linux fopen 中文

FILE *fopen(const char *filename, const char *mode);

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

int convert_encoding(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) return -1;
    char *pin = inbuf;
    char *pout = outbuf;
    size_t inbytesleft = inlen;
    size_t outbytesleft = outlen;
    int ret = iconv(cd, &pin, &inbytesleft, &pout, &outbytesleft);
    iconv_close(cd);
    return ret;
}

int main() {
    FILE *fp = fopen("中文文件.txt", "rb");
    if (!fp) {
        perror("fopen");
        return 1;
    }

    fseek(fp, 0, SEEK_END);
    long file_size = ftell(fp);
    fseek(fp, 0, SEEK_SET);

    char *inbuf = malloc(file_size + 1);
    fread(inbuf, 1, file_size, fp);
    inbuf[file_size] = '\0';

    char *outbuf = malloc(file_size * 4 + 1); // 足够大的缓冲区
    int result = convert_encoding("GBK", "UTF-8", inbuf, file_size, outbuf, file_size * 4);
    if (result == -1) {
        perror("iconv");
        free(inbuf);
        free(outbuf);
        fclose(fp);
        return 1;
    }

    printf("%s\n", outbuf);

    free(inbuf);
    free(outbuf);
    fclose(fp);
    return 0;
}