1 files changed, 86 insertions, 0 deletions
diff --git a/REORG.TODO/scripts/gen-posix-conf-vars.awk b/REORG.TODO/scripts/gen-posix-conf-vars.awk
new file mode 100644
index 0000000000..9a4c54256a
--- /dev/null
+++ b/REORG.TODO/scripts/gen-posix-conf-vars.awk
@@ -0,0 +1,86 @@
+# Generate posix-conf-vars-def.h with definitions for CONF_DEF{CONF} for each
+# configuration variable that getconf or sysconf may use.  Currently it is
+# equipped only to generate such macros for specification macros and for
+# SYSCONF macros in the _POSIX namespace.
+
+BEGIN {
+  prefix = ""
+}
+
+$1 ~ /^#/ || $0 ~ /^\s*$/ {
+  next
+}
+
+# Begin a new prefix.
+$NF == "{" {
+  type = $1
+  prefix = $2
+
+  if (NF == 4)
+    sc_prefix = $3
+  else
+    sc_prefix = "_SC"
+
+  next
+}
+
+$1 == "}" {
+  prefix = ""
+  type = ""
+  sc_prefix = ""
+  next
+}
+
+{
+  if (prefix == "" && type == "" && sc_prefix == "") {
+    printf ("Syntax error at %s:%d\n", FILENAME, FNR) > "/dev/stderr"
+    exit 1
+  }
+
+  # The prefix and variable names are indices and the value indicates what type
+  # of variable it is.  The possible options are:
+  # CONFSTR: A configuration string
+  # SYSCONF: A numeric value
+  # SPEC: A specification
+  c = prefix "_" $1
+  sc_prefixes[c] = sc_prefix
+  prefix_conf[c] = type
+  conf[c] = $1
+}
+
+END {
+  print "/* AUTOGENERATED by gen-posix-conf-vars.awk.  DO NOT EDIT.  */\n"
+
+  # Generate macros that specify if a sysconf macro is defined and/or set.
+  for (c in prefix_conf) {
+    printf "#ifndef _%s\n", c
+    printf "# define CONF_DEF_%s CONF_DEF_UNDEFINED\n", c
+    # CONFSTR have string values and they are not set or unset.
+    if (prefix_conf[c] != "CONFSTR") {
+      printf "#else\n"
+      printf "# if _%s > 0\n", c
+      printf "#  define CONF_DEF_%s CONF_DEF_DEFINED_SET\n", c
+      printf "# else\n"
+      printf "#  define CONF_DEF_%s CONF_DEF_DEFINED_UNSET\n", c
+      printf "# endif\n"
+    }
+    printf "#endif\n\n"
+
+    # Build a name -> sysconf number associative array to print a C array at
+    # the end.
+    if (prefix_conf[c] == "SPEC")
+      spec[c] = sc_prefixes[c] "_" conf[c]
+  }
+
+  # Print the specification array.  Define the macro NEED_SPEC_ARRAY before
+  # including posix-conf-vars.h to make it available in the compilation unit.
+  print "#if NEED_SPEC_ARRAY"
+  print "static const struct { const char *name; int num; } specs[] ="
+  print "  {"
+  for (s in spec) {
+    printf "    { \"%s\", %s },\n", s, spec[s]
+  }
+  print "  };"
+  print "static const size_t nspecs = sizeof (specs) / sizeof (specs[0]);"
+  print "#endif"
+}