This patch improves ISO C conformance of qmail code -- specifically,

of qmail-lspawn, qmail-newmrh, qmail-newu, qmail-pop3d, qmail-popup,
qmail-rspawn, and qmail-smtpd.  This fixes two known bugs:

  -  qmail-smtpd can be crashed by a client sending a sufficiently
     long (e.g. 2GB) header line in an email.

  -  qmail_lspawn, qmail-newmrh, qmail-newu, and qmail-rspawn might
     crash or otherwise misbehave on hosts with a smaller "int" type
     than "char *" type, e.g. 64-bit hosts with 32-bit "int"s.

The other changes are unlikely to have any effect, except possibly on
unusual architectures and/or in the presence of rare optimizations.

This is Version 1 of this patch.  It adds the changes to
cdbmake_add.c, spawn.c, and, correspondingly, Makefile, which pertain
to the second bug listed above.

Makefile

@@ -263,7 +263,7 @@ makelib cdbmake_pack.o cdbmake_hash.o cdbmake_add.o
 	cdbmake_add.o
 
 cdbmake_add.o: \
-compile cdbmake_add.c cdbmake.h uint32.h
+compile cdbmake_add.c cdbmake.h alloc.h uint32.h
 	./compile cdbmake_add.c
 
 cdbmake_hash.o: \
@@ -1892,7 +1892,7 @@ trylsock.c compile load
 
 spawn.o: \
 compile chkspawn spawn.c sig.h wait.h substdio.h byte.h str.h \
-stralloc.h gen_alloc.h select.h exit.h coe.h open.h error.h \
+stralloc.h gen_alloc.h select.h exit.h alloc.h coe.h open.h error.h \
 auto_qmail.h auto_uids.h auto_spawn.h
 	./chkspawn
 	./compile spawn.c

cdbmake_add.c

@@ -1,3 +1,4 @@
+#include "alloc.h"
 #include "cdbmake.h"
 
 void cdbmake_init(cdbm)

qmail-pop3d.c

@@ -66,14 +66,14 @@ void die_nomaildir() { err("this user has no $HOME/Maildir"); die(); }
 void die_scan() { err("unable to scan $HOME/Maildir"); die(); }
 
 void err_syntax() { err("syntax error"); }
-void err_unimpl() { err("unimplemented"); }
+void err_unimpl(arg) char *arg; { err("unimplemented"); }
 void err_deleted() { err("already deleted"); }
 void err_nozero() { err("messages are counted from 1"); }
 void err_toobig() { err("not that many messages"); }
 void err_nosuch() { err("unable to open that message"); }
 void err_nounlink() { err("unable to unlink all deleted messages"); }
 
-void okay() { puts("+OK \r\n"); flush(); }
+void okay(arg) char *arg; { puts("+OK \r\n"); flush(); }
 
 void printfn(fn) char *fn;
 {
@@ -146,7 +146,7 @@ void getlist()
   }
 }
 
-void pop3_stat()
+void pop3_stat(arg) char *arg;
 {
   int i;
   unsigned long total;
@@ -161,15 +161,15 @@ void pop3_stat()
   flush();
 }
 
-void pop3_rset()
+void pop3_rset(arg) char *arg;
 {
   int i;
   for (i = 0;i < numm;++i) m[i].flagdeleted = 0;
   last = 0;
-  okay();
+  okay(0);
 }
 
-void pop3_last()
+void pop3_last(arg) char *arg;
 {
   puts("+OK ");
   put(strnum,fmt_uint(strnum,last));
@@ -177,7 +177,7 @@ void pop3_last()
   flush();
 }
 
-void pop3_quit()
+void pop3_quit(arg) char *arg;
 {
   int i;
   for (i = 0;i < numm;++i)
@@ -192,7 +192,7 @@ void pop3_quit()
 	if (!stralloc_0(&line)) die_nomem();
 	rename(m[i].fn,line.s); /* if it fails, bummer */
       }
-  okay();
+  okay(0);
   die();
 }
 
@@ -214,7 +214,7 @@ void pop3_dele(arg) char *arg;
   if (i == -1) return;
   m[i].flagdeleted = 1;
   if (i + 1 > last) last = i + 1;
-  okay();
+  okay(0);
 }
 
 void list(i,flaguidl)
@@ -238,7 +238,7 @@ void dolisting(arg,flaguidl) char *arg; int flaguidl;
     list(i,flaguidl);
   }
   else {
-    okay();
+    okay(0);
     for (i = 0;i < numm;++i)
       if (!m[i].flagdeleted)
 	list(i,flaguidl);
@@ -267,7 +267,7 @@ void pop3_top(arg) char *arg;
  
   fd = open_read(m[i].fn);
   if (fd == -1) { err_nosuch(); return; }
-  okay();
+  okay(0);
   substdio_fdbuf(&ssmsg,read,fd,ssmsgbuf,sizeof(ssmsgbuf));
   blast(&ssmsg,limit);
   close(fd);
@@ -299,7 +299,7 @@ char **argv;
  
   getlist();
 
-  okay();
+  okay(0);
   commands(&ssin,pop3commands);
   die();
 }

qmail-popup.c

@@ -64,10 +64,10 @@ void die_badauth() { err("authorization failed"); }
 
 void err_syntax() { err("syntax error"); }
 void err_wantuser() { err("USER first"); }
-void err_authoriz() { err("authorization first"); }
+void err_authoriz(arg) char *arg; { err("authorization first"); }
 
-void okay() { puts("+OK \r\n"); flush(); }
-void pop3_quit() { okay(); die(); }
+void okay(arg) char *arg; { puts("+OK \r\n"); flush(); }
+void pop3_quit(arg) char *arg; { okay(0); die(); }
 
 
 char unique[FMT_ULONG + FMT_ULONG + 3];
@@ -136,7 +136,7 @@ void pop3_greet()
 void pop3_user(arg) char *arg;
 {
   if (!*arg) { err_syntax(); return; }
-  okay();
+  okay(0);
   seenuser = 1;
   if (!stralloc_copys(&username,arg)) die_nomem(); 
   if (!stralloc_0(&username)) die_nomem(); 

qmail-smtpd.c

@@ -51,12 +51,12 @@ void straynewline() { out("451 See http://pobox.com/~djb/docs/smtplf.html.\r\n")
 
 void err_bmf() { out("553 sorry, your envelope sender is in my badmailfrom list (#5.7.1)\r\n"); }
 void err_nogateway() { out("553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)\r\n"); }
-void err_unimpl() { out("502 unimplemented (#5.5.1)\r\n"); }
+void err_unimpl(arg) char *arg; { out("502 unimplemented (#5.5.1)\r\n"); }
 void err_syntax() { out("555 syntax error (#5.5.4)\r\n"); }
 void err_wantmail() { out("503 MAIL first (#5.5.1)\r\n"); }
 void err_wantrcpt() { out("503 RCPT first (#5.5.1)\r\n"); }
-void err_noop() { out("250 ok\r\n"); }
-void err_vrfy() { out("252 send some mail, i'll try my best\r\n"); }
+void err_noop(arg) char *arg; { out("250 ok\r\n"); }
+void err_vrfy(arg) char *arg; { out("252 send some mail, i'll try my best\r\n"); }
 void err_qqt() { out("451 qqt failure (#4.3.0)\r\n"); }
 
 
@@ -67,11 +67,11 @@ void smtp_greet(code) char *code;
   substdio_puts(&ssout,code);
   substdio_put(&ssout,greeting.s,greeting.len);
 }
-void smtp_help()
+void smtp_help(arg) char *arg;
 {
   out("214 netqmail home page: http://qmail.org/netqmail\r\n");
 }
-void smtp_quit()
+void smtp_quit(arg) char *arg;
 {
   smtp_greet("221 "); out("\r\n"); flush(); _exit(0);
 }
@@ -232,7 +232,7 @@ void smtp_ehlo(arg) char *arg;
   smtp_greet("250-"); out("\r\n250-PIPELINING\r\n250 8BITMIME\r\n");
   seenmail = 0; dohelo(arg);
 }
-void smtp_rset()
+void smtp_rset(arg) char *arg;
 {
   seenmail = 0;
   out("250 flushed\r\n");
@@ -316,8 +316,8 @@ int *hops;
         if (flagmaybex) if (pos == 7) ++*hops;
         if (pos < 2) if (ch != "\r\n"[pos]) flagmaybey = 0;
         if (flagmaybey) if (pos == 1) flaginheader = 0;
+	++pos;
       }
-      ++pos;
       if (ch == '\n') { pos = 0; flagmaybex = flagmaybey = flagmaybez = 1; }
     }
     switch(state) {
@@ -365,7 +365,7 @@ void acceptmessage(qp) unsigned long qp;
   out("\r\n");
 }
 
-void smtp_data() {
+void smtp_data(arg) char *arg; {
   int hops;
   unsigned long qp;
   char *qqx;

spawn.c

@@ -5,6 +5,7 @@
 #include "substdio.h"
 #include "byte.h"
 #include "str.h"
+#include "alloc.h"
 #include "stralloc.h"
 #include "select.h"
 #include "exit.h"