cutils.c

   1 #include <stdio.h>
   2 #include <errno.h>
   3 #include <stdarg.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7 #include <inttypes.h>
   8 #include <sys/time.h>
   9
  10 #include "cutils.h"
  11
  12 _Noreturn void GCC_FMT_ATTR (3, 4) err (int exitcode, int errno_val,
  13                                         const char *fmt, ...)
  14 {
  15     va_list ap;
  16
  17     va_start (ap, fmt);
  18     vfprintf (stdout, fmt, ap);
  19     va_end (ap);
  20     fprintf (stdout, ": %s\n", strerror (errno_val));
  21     fflush (stdout);
  22     _exit (exitcode);
  23 }
  24
  25 _Noreturn void GCC_FMT_ATTR (2, 3) errx (int exitcode, const char *fmt, ...)
  26 {
  27     va_list ap;
  28
  29     va_start (ap, fmt);
  30     vfprintf (stdout, fmt, ap);
  31     va_end (ap);
  32     fputc ('\n', stdout);
  33     fflush (stdout);
  34     _exit (exitcode);
  35 }
  36
  37 void *parse_pointer (const char *cap, const char *s)
  38 {
  39     void *ptr;
  40     int ret = sscanf (s, "%" SCNxPTR, (uintptr_t *) &ptr);
  41     if (ret != 1) {
  42         errx (1, "%s: cannot parse pointer in `%s' (ret=%d)", cap, s, ret);
  43     }
  44     return ptr;
  45 }
  46
  47 double now (void)
  48 {
  49     struct timeval tv;
  50     gettimeofday (&tv, NULL);   /* gettimeofday shall always return zero */
  51     return tv.tv_sec + tv.tv_usec*1e-6;
  52 }
  53
  54 void fmt_linkn (char *s, const char *c, unsigned int l, int n)
  55 {
  56     div_t d;
  57     int sl = 0, nn = n;
  58
  59     do { d = div (n, l); sl++; n = d.quot; } while (d.quot);
  60     for (int i = 0, n = nn; i < sl; ++i) {
  61         d = div (n, l);
  62         s[sl-1-i] = c[d.rem];
  63         n = d.quot;
  64     }
  65     s[sl] = 0;
  66 }