working toward a process-group signalling system

1 files changed, 47 insertions, 11 deletions

diff --git a/tools/skrewt.c b/tools/skrewt.c
index 8ae4db4..b81f0ea 100644
--- a/tools/skrewt.c
+++ b/tools/skrewt.c
@@ -21,7 +21,8 @@ void usage(const int sts){
 "\n"
 "  Typically used as a filter in a pipeline, along with spamc -E\n"
 "  Options\n"
-"    -h      print this msg (and exit immediately).\n"
+"    -help              print this msg (and exit immediately).\n"
+"    -maxsize ii        msg size in bytes; anything bigger will be rejected.\n"
 "\n"
 "  Messages containing the string '-please-bounce-this-' will be rejected.\n"
 "  Messages with no date will be rejected.\n"
@@ -82,17 +83,53 @@ string toLower(const std::string& a){
   return rslt;
 }
 
-
+////////////////
 string ltrim(string foo){
   size_t where = foo.find_first_not_of(" \t\r\n");
   if (where == foo.npos) return foo;
   return foo.substr(where);
 }
 
-int main(int argc, char** argv){
-  if (argc > 1) {
-    if (argv[1] == string("-h")) usage(0);
-    usage(1);
+////////////////
+// little utility to help with argument parsing:
+//
+int prefix(const string shorter, const string longer){
+  return shorter == longer.substr(0, shorter.length());
+}
+
+////////////////////////////////////////////////////////////
+int main(int _argc, const char** _argv){
+////  pid_t pid = getpid();
+////  cout << pid << endl;
+////  cout << getpgid(pid) << endl;
+  int argc(_argc);
+  const char **argv(_argv);
+  string progname(*argv); argv++; argc--;
+
+  int maxsize(1000000);
+
+  while (argc) {
+    string arg(*argv); argv++; argc--;
+    if (arg.substr(0,2) == "--") arg = arg.substr(1);
+    if (prefix(arg, "-help")) {
+      usage(0);
+    }
+    if (prefix(arg, "-maxsize")) {
+      if (!argc) {
+        cerr << "Option -maxsize requires an argument" << endl;
+        exit(1);
+      }
+      maxsize = atoi(*argv); argv++; argc--;
+    }
+    if (arg.substr(0,1) == "-") {
+      cerr << "Unrecognized option '" << arg << "'" << endl;
+      cerr << "For help, try:  " << progname << " -help" << endl;
+      exit(1);
+    } else {
+      cerr << "Extraneous verbiage '" << arg << "'" << endl;
+      cerr << "For help, try:  " << progname << " -help" << endl;
+      exit(1);
+    }
   }
 
   int inheads(1);
@@ -101,7 +138,6 @@ int main(int argc, char** argv){
   int textlines(0);
   int gotdate(0);
   int msgsize(0);
-  int msgmax(1000000);
   for (;;){
     if (cin.eof()) break;
     if (cin.bad()) return 1;
@@ -119,8 +155,8 @@ int main(int argc, char** argv){
         string line;
         if (getline(cin, line).fail()) continue;
         msgsize += line.length()+1;
-        if (msgsize > msgmax) {
-          cerr << "skrewt rejection: bigger than " << msgmax << endl;
+        if (msgsize > maxsize) {
+          cerr << "skrewt rejection: bigger than " << maxsize << endl;
           exit(1);
         }
         header += "\n" + line;
@@ -185,8 +221,8 @@ int main(int argc, char** argv){
       string line;
       if (!getline(cin, line).fail()) {
         msgsize += line.length()+1;
-        if (msgsize > msgmax) {
-          cerr << "skrewt rejection: bigger than " << msgmax << endl;
+        if (msgsize > maxsize) {
+          cerr << "skrewt rejection: bigger than " << maxsize << endl;
           exit(1);
         }
         if (line == "--" + boundary) {