bringing in awk preprocessor from rusty-snake

1 files changed, 64 insertions, 0 deletions

diff --git a/src/man/preproc.awk b/src/man/preproc.awk
new file mode 100755
index 000000000..d5cee8c44
--- /dev/null
+++ b/src/man/preproc.awk
@@ -0,0 +1,64 @@
+#!/usr/bin/gawk -E
+
+# Copyright (c) 2019,2020 rusty-snake
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+function errexit(msg) {
+        print msg > "/dev/stderr"
+        exit 1
+}
+
+BEGIN {
+        macros[0] = 0
+        for (arg in ARGV) {
+                if (ARGV[arg] ~ /^-D[A-Z_]+$/) {
+                        macros[length(macros) + 1] = substr(ARGV[arg], 3)
+                } else {
+                        if (ARGV[arg] == "gawk" || ARGV[arg] == "awk")
+                                continue
+#                       errexit("Invalid commandline argument" ARGV[arg])
+                }
+                ARGV[arg] = ""
+        }
+
+        include = 1
+}
+/^#ifdef [A-Z_]+$/ {
+        macro = substr($0, 8)
+        for (i in macros) {
+                if (macros[i] == macro) {
+                        include = 1
+                        next
+                }
+        }
+        include = 0
+}
+/^#if 0$/ {
+        include = 0
+        next
+}
+/^#endif$/ {
+        include = 1
+        next
+}
+{
+        if (include)
+                print
+}