#include <stddef.h>
#include <stdio.h>
#include <string.h>

__attribute__((noinline)) int read_only_scanners(const char* haystack) {
    const void* m = memchr(haystack, 'x', strlen(haystack));
    const char* s = strstr(haystack, "needle");
    const char* c = strchr(haystack, '=');
    return (m != NULL) + (s != NULL) + (c != NULL);
}

__attribute__((noinline)) void safe_writer(char* dst, const char* src) {
    char local[32];
    memset(local, 0, sizeof(local));
    memcpy(local, src, 8);
    strncpy(dst, local, 31);
    dst[31] = '\0';
}

int main(void) {
    char dst[32];
    safe_writer(dst, "needle=x");
    printf("%d %s\n", read_only_scanners(dst), dst);
    return 0;
}