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     size_t len;
  17     int i, j;
  18     char c, *bp;
  19
  20     snprintf (buffer, n, bits && *bits == 010 ? "0%o" : "0x%x", v);
  21     len = strlen(buffer);
  22     bp = buffer + len;
  23     n -= len;
  24
  25     if (bits && *++bits) {
  26         j = 0;
  27         *bp++ = '<';
  28         while ((i = *bits++) && n > 1)
  29             if (v & (1 << (i - 1))) {
  30                 if (j++ && n > 1) {
  31                     *bp++ = ',';
  32                     n--;
  33                 }
  34                 for (; (c = *bits) > 32 && n > 1; bits++) {
  35                     *bp++ = c;
  36                     n--;
  37                 }
  38             }
  39             else
  40                 for (; *bits > 32; bits++)
  41                     continue;
  42         if (n > 1)
  43             *bp++ = '>';
  44
  45         *bp = 0;
  46     }
  47
  48     return buffer;
  49 }