scripts/firstversions.awk

   1 # Script to preprocess Versions.all lists based on "earliest version"
   2 # specifications in the shlib-versions file.
   3
   4 # Return -1, 0 or 1 according to whether v1 is less than, equal to or
   5 # greater than v2 as a version string. Simplified from GNU Autoconf
   6 # version; this one does not need to handle .0x fraction-style versions.
   7 function vers_compare (v1, v2)
   8 {
   9   while (length(v1) && length(v2)) {
  10     if (v1 ~ /^[0-9]/ && v2 ~ /^[0-9]/) {
  11       for (len1 = 1; substr(v1, len1 + 1) ~ /^[0-9]/; len1++) continue;
  12       for (len2 = 1; substr(v2, len2 + 1) ~ /^[0-9]/; len2++) continue;
  13       d1 = substr(v1, 1, len1); v1 = substr(v1, len1 + 1);
  14       d2 = substr(v2, 1, len2); v2 = substr(v2, len2 + 1);
  15       d1 += 0;
  16       d2 += 0;
  17     } else {
  18       d1 = substr(v1, 1, 1); v1 = substr(v1, 2);
  19       d2 = substr(v2, 1, 1); v2 = substr(v2, 2);
  20     }
  21     if (d1 < d2) return -1;
  22     if (d1 > d2) return 1;
  23   }
  24   if (length(v2)) return -1;
  25   if (length(v1)) return 1;
  26   return 0;
  27 }
  28
  29 NF > 2 && $2 == ":" {
  30   for (i = 0; i <= NF - 3; ++i)
  31     firstversion[$1, i] = $(3 + i);
  32   idx[$1] = 0;
  33   next;
  34 }
  35
  36 NF == 2 && $2 == "{" { thislib = $1; print; next }
  37
  38 $1 == "}" {
  39   if ((thislib, idx[thislib]) in firstversion) {
  40     # We haven't seen the stated version, but have produced
  41     # others pointing to it, so we synthesize it now.
  42     printf "  %s\n", firstversion[thislib, idx[thislib]];
  43     idx[thislib]++;
  44   }
  45   print;
  46   next;
  47 }
  48
  49 /GLIBC_PRIVATE/ { print; next }
  50
  51 {
  52   if ((thislib, idx[thislib]) in firstversion) {
  53     f = v = firstversion[thislib, idx[thislib]];
  54     while (vers_compare($1, v) >= 0) {
  55       delete firstversion[thislib, idx[thislib]];
  56       idx[thislib]++;
  57       if ((thislib, idx[thislib]) in firstversion)
  58         v = firstversion[thislib, idx[thislib]];
  59       else
  60         break;
  61     }
  62     if ($1 == v || $1 == f)
  63       # This version was the specified earliest version itself.
  64       print;
  65     else if (vers_compare($1, v) < 0) {
  66       # This version is older than the specified earliest version.
  67       print "  " $1, "=", v;
  68       # Record that V has been referred to, so we will be sure to emit it
  69       # if we hit a later one without hitting V itself.
  70       usedversion[thislib, v] = 1;
  71     }
  72     else {
  73       # This version is newer than the specified earliest version.
  74       # We haven't seen that version itself or else we wouldn't be here
  75       # because we would have removed it from the firstversion array.
  76       # If there were any earlier versions that used that one, emit it now.
  77       if ((thislib, v) in usedversion) {
  78         print "  " v;
  79       }
  80       print "  " $1;
  81     }
  82   }
  83   else
  84     print;
  85 }