#include <stdio.h>#include <errno.h>#include <stdarg.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <inttypes.h>#include <sys/time.h> #include "cutils.h" _Noreturn void GCC_FMT_ATTR (3, 4) err (int exitcode, int errno_val,                                        const char *fmt, ...){    va_list ap;     va_start (ap, fmt);    vfprintf (stdout, fmt, ap);    va_end (ap);    fprintf (stdout, ": %s\n", strerror (errno_val));    fflush (stdout);    _exit (exitcode);} _Noreturn void GCC_FMT_ATTR (2, 3) errx (int exitcode, const char *fmt, ...){    va_list ap;     va_start (ap, fmt);    vfprintf (stdout, fmt, ap);    va_end (ap);    fputc ('\n', stdout);    fflush (stdout);    _exit (exitcode);} void *parse_pointer (const char *cap, const char *s){    void *ptr;    int ret = sscanf (s, "%" SCNxPTR, (uintptr_t *) &ptr);    if (ret != 1) {        errx (1, "%s: cannot parse pointer in `%s' (ret=%d)", cap, s, ret);    }    return ptr;} double now (void){    struct timeval tv;    gettimeofday (&tv, NULL);   /* gettimeofday shall always return zero */    return tv.tv_sec + tv.tv_usec*1e-6;} void fmt_linkn (char *s, const char *c, unsigned int l, int n){    div_t d;    int sl = 0, nn = n;     do { d = div (n, l); sl++; n = d.quot; } while (d.quot);    for (int i = 0, n = nn; i < sl; ++i) {        d = div (n, l);        s[sl-1-i] = c[d.rem];        n = d.quot;    }    s[sl] = 0;}