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

   1
   2 /*
   3  * snprintb.c -- snprintf a %b string
   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
  13 char *
  14 snprintb (char *buffer, size_t n, unsigned v, char *bits)
  15 {
  16     register int i, j;
  17     register char c, *bp;
  18
  19     snprintf (buffer, n, bits && *bits == 010 ? "0%o" : "0x%x", v);
  20     bp = buffer + strlen(buffer);
  21     n -= strlen(buffer);
  22
  23     if (bits && *++bits) {
  24         j = 0;
  25         *bp++ = '<';
  26         while ((i = *bits++) && n > 1)
  27             if (v & (1 << (i - 1))) {
  28                 if (j++ && n > 1) {
  29                     *bp++ = ',';
  30                     n--;
  31                 }
  32                 for (; (c = *bits) > 32 && n > 1; bits++) {
  33                     *bp++ = c;
  34                     n--;
  35                 }
  36             }
  37             else
  38                 for (; *bits > 32; bits++)
  39                     continue;
  40         if (n > 1)
  41             *bp++ = '>';
  42
  43         *bp = 0;
  44     }
  45
  46     return buffer;
  47 }