diplodocus.org Git - nmh/blob - sbr/error.c

   1
   2 /*
   3  * error.c -- main error handling routines
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #include <h/mh.h>
  11
  12 #ifdef HAVE_WRITEV
  13 # include <sys/types.h>
  14 # include <sys/uio.h>
  15 #endif
  16
  17
  18 /*
  19  * print out error message
  20  */
  21 void
  22 advise (char *what, char *fmt, ...)
  23 {
  24     va_list ap;
  25
  26     va_start(ap, fmt);
  27     advertise (what, NULL, fmt, ap);
  28     va_end(ap);
  29 }
  30
  31
  32 /*
  33  * print out error message and exit
  34  */
  35 void
  36 adios (char *what, char *fmt, ...)
  37 {
  38     va_list ap;
  39
  40     va_start(ap, fmt);
  41     advertise (what, NULL, fmt, ap);
  42     va_end(ap);
  43     done (1);
  44 }
  45
  46
  47 /*
  48  * admonish the user
  49  */
  50 void
  51 admonish (char *what, char *fmt, ...)
  52 {
  53     va_list ap;
  54
  55     va_start(ap, fmt);
  56     advertise (what, "continuing...", fmt, ap);
  57     va_end(ap);
  58 }
  59
  60
  61 /*
  62  * main routine for printing error messages.
  63  *
  64  * Use writev() if available, for slightly better performance.
  65  * Why?  Well, there are a couple of reasons.  Primarily, it
  66  * gives a smoother output...  More importantly though, it's a
  67  * sexy syscall()...
  68  */
  69 void
  70 advertise (char *what, char *tail, char *fmt, va_list ap)
  71 {
  72     int eindex = errno;
  73
  74 #ifdef HAVE_WRITEV
  75     char buffer[BUFSIZ], err[BUFSIZ];
  76     struct iovec iob[20], *iov;
  77 #endif
  78
  79     fflush (stdout);
  80
  81 #ifdef HAVE_WRITEV
  82     fflush (stderr);
  83     iov = iob;
  84
  85     if (invo_name && *invo_name) {
  86         iov->iov_len = strlen (iov->iov_base = invo_name);
  87         iov++;
  88         iov->iov_len = strlen (iov->iov_base = ": ");
  89         iov++;
  90     }
  91
  92     vsnprintf (buffer, sizeof(buffer), fmt, ap);
  93     iov->iov_len = strlen (iov->iov_base = buffer);
  94     iov++;
  95     if (what) {
  96         if (*what) {
  97             iov->iov_len = strlen (iov->iov_base = " ");
  98             iov++;
  99             iov->iov_len = strlen (iov->iov_base = what);
 100             iov++;
 101             iov->iov_len = strlen (iov->iov_base = ": ");
 102             iov++;
 103         }
 104         if (!(iov->iov_base = strerror (eindex))) {
 105             /* this shouldn't happen, but we'll test for it just in case */
 106             snprintf (err, sizeof(err), "Error %d", eindex);
 107             iov->iov_base = err;
 108         }
 109         iov->iov_len = strlen (iov->iov_base);
 110         iov++;
 111     }
 112     if (tail && *tail) {
 113         iov->iov_len = strlen (iov->iov_base = ", ");
 114         iov++;
 115         iov->iov_len = strlen (iov->iov_base = tail);
 116         iov++;
 117     }
 118     iov->iov_len = strlen (iov->iov_base = "\n");
 119     iov++;
 120     writev (fileno (stderr), iob, iov - iob);
 121 #else
 122     if (invo_name && *invo_name)
 123         fprintf (stderr, "%s: ", invo_name);
 124     vfprintf (stderr, fmt, ap);
 125
 126     if (what) {
 127         char *s;
 128
 129         if (*what)
 130             fprintf (stderr, " %s: ", what);
 131         if ((s = strerror(eindex)))
 132             fprintf (stderr, "%s", s);
 133         else
 134             fprintf (stderr, "Error %d", eindex);
 135     }
 136     if (tail)
 137         fprintf (stderr, ", %s", tail);
 138     fputc ('\n', stderr);
 139 #endif
 140 }