print.c

   1 #include "mmq.h"
   2
   3 /*
   4  * not thread safe, we won't ever try to be
   5  * this buffer is intentionally tiny because we want to keep all
   6  * of our messages as short as possible.  For path names, we write()
   7  * to STDOUT_FILENO directly.
   8  */
   9 static char buf[80];
  10
  11 static void spew(int fd, const char *fmt, va_list ap)
  12 {
  13         int nr = vsnprintf(buf, sizeof(buf), fmt, ap);
  14
  15         assert(nr > 0 && nr < sizeof(buf) && "spew buffer too small");
  16         write(fd, buf, nr);
  17 }
  18
  19 void emit(const char *fmt, ...)
  20 {
  21         va_list ap;
  22
  23         va_start(ap, fmt);
  24         spew(1, fmt, ap);
  25         va_end(ap);
  26 }
  27
  28 void warn(const char *fmt, ...)
  29 {
  30         va_list ap;
  31
  32         va_start(ap, fmt);
  33         spew(2, fmt, ap);
  34         va_end(ap);
  35 }
  36
  37 NORETURN void die(const char *fmt, ...)
  38 {
  39         va_list ap;
  40
  41         va_start(ap, fmt);
  42         spew(2, fmt, ap);
  43         va_end(ap);
  44         exit(1);
  45 }