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   1 /* snprintb.c -- snprintf a %b string
   2  *
   3  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   4  * COPYRIGHT file in the root directory of the nmh distribution for
   5  * complete copyright information.
   6  */
   7
   8 #include <h/mh.h>
   9
  10
  11 char *
  12 snprintb (char *buffer, size_t n, unsigned v, char *bits)
  13 {
  14     size_t len;
  15     int i, j;
  16     char c, *bp;
  17
  18     snprintf (buffer, n, bits && *bits == 010 ? "0%o" : "0x%x", v);
  19     len = strlen(buffer);
  20     bp = buffer + len;
  21     n -= len;
  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 }