avoid null pointer dereference on %*p fields in scanf

[musl] / src / stdio / __string_read.c

#include "stdio_impl.h"

size_t __string_read(FILE *f, unsigned char *buf, size_t len)
{
        char *src = f->cookie;
        size_t k = strnlen(src, len+256);
        if (k < len) len = k;
        memcpy(buf, src, len);
        f->rpos = (void *)(src+len);
        f->rend = (void *)(src+k);
        f->cookie = src+k;
        return len;
}