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#include<stdio.h>
 
int main(void) {
    FILE *fp;
    size_t nread;
    if( fopen_s(&fp, "sample.c", "rb") < 0) {
        return 1;
    }
    char buf[BUFSIZ];
    while((nread = fread(buf, sizeof(char), BUFSIZ, fp)) > 0 ) {
        for(size_t it = 0; it != nread; ++it) {
            fwrite(buf+it, sizeof(char), 1, stdout);
        }
    }
    return 0;
//この日本語部分が文字化けする。
}

prog.c: In function ‘main’:
prog.c:6:9: warning: implicit declaration of function ‘fopen_s’; did you mean ‘fopen’? [-Wimplicit-function-declaration]
     if( fopen_s(&fp, "sample.c", "rb") < 0) {
         ^~~~~~~
         fopen
/usr/bin/ld: /home/y4dFMu/ccwcPlgf.o: in function `main':
prog.c:(.text.startup+0x37): undefined reference to `fopen_s'
collect2: error: ld returned 1 exit status

Standard output is empty