automate enumeration of power-of-two #defines

this is a lot more legible, and makes it possible to insert values in
the middle without churn.

i didn't find a way to do this with the pre-processor, so we now have
another code generator.

we now use the $< make variable, which requires gmake on netbsd < 9.0,
and possibly other systems with an ancient make.

src/.gitignore

@@ -1,3 +1,4 @@
+/*_enum.h
 /drv_proxy.inc
 /mbsync
 /mdconvert

src/Makefile.am

@@ -19,6 +19,28 @@ drv_proxy.$(OBJEXT): drv_proxy.inc
 drv_proxy.inc: $(srcdir)/driver.h $(srcdir)/drv_proxy.c $(srcdir)/drv_proxy_gen.pl
 	perl $(srcdir)/drv_proxy_gen.pl $(srcdir)/driver.h $(srcdir)/drv_proxy.c drv_proxy.inc
 
+ENUM_GEN = $(srcdir)/bit_enum_gen.pl
+
+$(mbsync_OBJECTS): common_enum.h
+common_enum.h: common.h $(ENUM_GEN)
+	perl $(ENUM_GEN) < $< > $@
+
+$(mbsync_OBJECTS): driver_enum.h
+driver_enum.h: driver.h $(ENUM_GEN)
+	perl $(ENUM_GEN) < $< > $@
+
+$(mbsync_OBJECTS): sync_enum.h
+sync_enum.h: sync.h $(ENUM_GEN)
+	perl $(ENUM_GEN) < $< > $@
+
+sync.$(OBJEXT): sync_c_enum.h
+sync_c_enum.h: sync.c $(ENUM_GEN)
+	perl $(ENUM_GEN) < $< > $@
+
+sync.$(OBJEXT) sync_state.$(OBJEXT): sync_p_enum.h
+sync_p_enum.h: sync_p.h $(ENUM_GEN)
+	perl $(ENUM_GEN) < $< > $@
+
 mdconvert_SOURCES = mdconvert.c
 mdconvert_LDADD = $(DB_LIBS)
 if with_mdconvert
@@ -36,6 +58,6 @@ EXTRA_PROGRAMS = tst_timers
 exampledir = $(docdir)/examples
 example_DATA = mbsyncrc.sample
 
-EXTRA_DIST = drv_proxy_gen.pl run-tests.pl $(example_DATA) $(man_MANS)
+EXTRA_DIST = bit_enum_gen.pl drv_proxy_gen.pl run-tests.pl $(example_DATA) $(man_MANS)
 
-CLEANFILES = drv_proxy.inc
+CLEANFILES = *_enum.h drv_proxy.inc

src/bit_enum_gen.pl

@@ -0,0 +1,55 @@
+#!/usr/bin/perl
+#
+# SPDX-FileCopyrightText: 2022 Oswald Buddenhagen <ossi@users.sf.net>
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# mbsync - mailbox synchronizer
+#
+
+use strict;
+use warnings;
+
+my $in_enum = 0;
+my $conts;
+while (<>) {
+	s,\s*(?://.*)?$,,;
+	if ($in_enum) {
+		if (/^\)$/) {
+			$conts =~ s/\s//g;
+			$conts =~ s/,$//;
+			my @vals = split(/,/, $conts);
+			my $pfx;
+			for my $e (@vals) {
+				if (!defined($pfx)) {
+					$pfx = ($e =~ /^([A-Z]+_)/) ? $1 : "";
+				} elsif (length($pfx)) {
+					$pfx = "" if ((($e =~ /^([A-Z]+_)/) ? $1 : "") ne $pfx);
+				}
+			}
+			my $bit = 1;
+			my $bitn = 0;
+			for my $e (@vals) {
+				my $bits = ($e =~ s/\((\d+)\)$//) ? $1 : 1;
+				if ($bits != 1) {
+					print "#define $e(b) ($bit << (b))\n";
+				} else {
+					print "#define $e $bit\n";
+				}
+				$bit <<= $bits;
+				$bitn += $bits;
+			}
+			if (length($pfx)) {
+				print "#define ${pfx}_NUM_BITS $bitn\n";
+			}
+			print "\n";
+			$in_enum = 0;
+		} else {
+			$conts .= $_;
+		}
+	} else {
+		if (/^BIT_ENUM\($/) {
+			$conts = "";
+			$in_enum = 1;
+		}
+	}
+}

src/common.h

@@ -21,6 +21,8 @@
 #include <string.h>
 #include <time.h>
 
+#include "common_enum.h"
+
 typedef unsigned char uchar;
 typedef unsigned short ushort;
 typedef unsigned int uint;
@@ -41,6 +43,8 @@ typedef unsigned long ulong;
 #define shifted_bit(in, from, to) \
 	((int)(((uint)(in) / (from > to ? from / to : 1) * (to > from ? to / from : 1)) & to))
 
+#define BIT_ENUM(...)
+
 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
 # define ATTR_UNUSED __attribute__((unused))
 # define ATTR_NORETURN __attribute__((noreturn))
@@ -90,18 +94,23 @@ enum {
 	VERBOSE,
 };
 
-#define DEBUG_CRASH     0x01
+BIT_ENUM(
-#define DEBUG_MAILDIR   0x02
+	DEBUG_MAILDIR,
-#define DEBUG_NET       0x04
+	DEBUG_NET,
-#define DEBUG_NET_ALL   0x08
+	DEBUG_NET_ALL,
-#define DEBUG_SYNC      0x10
+	DEBUG_SYNC,
-#define DEBUG_MAIN      0x20
+	DEBUG_MAIN,
-#define DEBUG_DRV       0x40
+	DEBUG_DRV,
-#define DEBUG_DRV_ALL   0x80
+	DEBUG_DRV_ALL,
-#define PROGRESS        0x400
+
-#define KEEPJOURNAL     0x1000
+	DEBUG_CRASH,
-#define ZERODELAY       0x2000
+
-#define FORCEASYNC      0x4000
+	PROGRESS,
+
+	ZERODELAY,
+	KEEPJOURNAL,
+	FORCEASYNC,
+)
 
 #define DEBUG_ANY (DEBUG_MAILDIR | DEBUG_NET | DEBUG_SYNC | DEBUG_MAIN | DEBUG_DRV)
 #define DEBUG_ALL (DEBUG_ANY | DEBUG_CRASH)

src/driver.h

@@ -9,6 +9,7 @@
 #define DRIVER_H
 
 #include "config.h"
+#include "driver_enum.h"
 
 typedef struct driver driver_t;
 
@@ -33,26 +34,29 @@ typedef struct store_conf {
 /* For message->flags */
 // Keep the MESSAGE_FLAGS in sync (grep that)!
 /* The order is according to alphabetical maildir flag sort */
-#define F_DRAFT	     (1<<0) /* Draft */
+BIT_ENUM(
-#define F_FLAGGED    (1<<1) /* Flagged */
+	F_DRAFT,      // Draft
-#define F_FORWARDED  (1<<2) /* Passed */
+	F_FLAGGED,    // Flagged
-#define F_ANSWERED   (1<<3) /* Replied */
+	F_FORWARDED,  // Passed
-#define F_SEEN       (1<<4) /* Seen */
+	F_ANSWERED,   // Replied
-#define F_DELETED    (1<<5) /* Trashed */
+	F_SEEN,       // Seen
-#define NUM_FLAGS 6
+	F_DELETED,    // Trashed
-
+)
-extern const char MsgFlags[NUM_FLAGS];
+
+extern const char MsgFlags[F__NUM_BITS];
 void make_flags( uchar flags, char *buf );
 
 /* For message->status */
-#define M_RECENT       (1<<0) /* unsyncable flag; maildir_* depend on this being 1<<0 */
+BIT_ENUM(
-#define M_DEAD         (1<<1) /* expunged */
+	M_RECENT,   // unsyncable flag; maildir_*() depend on this being bit 0
-#define M_FLAGS        (1<<2) /* flags fetched */
+	M_DEAD,     // expunged
-// The following are only for IMAP FETCH response parsing
+	M_FLAGS,    // flags are valid
-#define M_DATE         (1<<3)
+	// The following are only for IMAP FETCH response parsing
-#define M_SIZE         (1<<4)
+	M_DATE,
-#define M_BODY         (1<<5)
+	M_SIZE,
-#define M_HEADER       (1<<6)
+	M_BODY,
+	M_HEADER,
+)
 
 #define TUIDL 12
 
@@ -74,15 +78,17 @@ typedef struct message {
 // The drivers don't use the first two, but may set them if loading the
 // particular range is required to handle some other flag; note that these
 // ranges may overlap.
-#define OPEN_OLD        (1<<0)  // Paired messages *in* this store.
+BIT_ENUM(
-#define OPEN_NEW        (1<<1)  // Messages (possibly) not yet propagated *from* this store.
+	OPEN_OLD,         // Paired messages *in* this store.
-#define OPEN_FLAGS      (1<<2)  // Note that fetch_msg() gets the flags regardless.
+	OPEN_NEW,         // Messages (possibly) not yet propagated *from* this store.
-#define OPEN_NEW_SIZE   (1<<4)
+	OPEN_FIND,
-#define OPEN_EXPUNGE    (1<<5)
+	OPEN_FLAGS,       // Note that fetch_msg() gets the flags regardless.
-#define OPEN_SETFLAGS   (1<<6)
+	OPEN_NEW_SIZE,
-#define OPEN_APPEND     (1<<7)
+	OPEN_OLD_IDS,
-#define OPEN_FIND       (1<<8)
+	OPEN_APPEND,
-#define OPEN_OLD_IDS    (1<<9)
+	OPEN_SETFLAGS,
+	OPEN_EXPUNGE,
+)
 
 #define UIDVAL_BAD ((uint)-1)
 

src/drv_maildir.c

@@ -1565,7 +1565,7 @@ maildir_store_msg( store_t *gctx, msg_data_t *data, int to_trash,
 	const char *box;
 	int ret, fd, bl;
 	uint uid;
-	char buf[_POSIX_PATH_MAX], nbuf[_POSIX_PATH_MAX], fbuf[NUM_FLAGS + 3], base[128];
+	char buf[_POSIX_PATH_MAX], nbuf[_POSIX_PATH_MAX], fbuf[as(MsgFlags) + 3], base[128];
 
 	bl = nfsnprintf( base, sizeof(base), "%lld.%d_%d.%s", (long long)time( NULL ), Pid, ++MaildirCount, Hostname );
 	if (!to_trash) {

src/sync.c

@@ -6,6 +6,7 @@
  */
 
 #include "sync_p.h"
+#include "sync_c_enum.h"
 
 channel_conf_t global_conf;
 channel_conf_t *channels;
@@ -43,23 +44,24 @@ static int check_cancel( sync_vars_t *svars );
    cleanup: close(F) & close(N)
 */
 
-#define ST_LOADED          (1<<0)
+BIT_ENUM(
-#define ST_FIND_OLD        (1<<1)
+	ST_PRESENT,
-#define ST_SENT_NEW        (1<<2)
+	ST_CONFIRMED,
-#define ST_FIND_NEW        (1<<3)
+	ST_SELECTED,
-#define ST_FOUND_NEW       (1<<4)
+	ST_FIND_OLD,
-#define ST_SENT_FLAGS      (1<<5)
+	ST_LOADED,
-#define ST_SENT_TRASH      (1<<6)
+	ST_SENT_FLAGS,
-#define ST_CLOSED          (1<<7)
+	ST_SENDING_NEW,
-#define ST_SENT_CANCEL     (1<<8)
+	ST_SENT_NEW,
-#define ST_CANCELED        (1<<9)
+	ST_FIND_NEW,
-#define ST_SELECTED        (1<<10)
+	ST_FOUND_NEW,
-#define ST_DID_EXPUNGE     (1<<11)
+	ST_SENT_TRASH,
-#define ST_CLOSING         (1<<12)
+	ST_CLOSING,
-#define ST_CONFIRMED       (1<<13)
+	ST_CLOSED,
-#define ST_PRESENT         (1<<14)
+	ST_DID_EXPUNGE,
-#define ST_SENDING_NEW     (1<<15)
+	ST_SENT_CANCEL,
-
+	ST_CANCELED,
+)
 
 static uchar
 sanitize_flags( uchar tflags, sync_vars_t *svars, int t )

src/sync.h

@@ -9,26 +9,31 @@
 #define SYNC_H
 
 #include "driver.h"
+#include "sync_enum.h"
 
 #define F 0  // far side
 #define N 1  // near side
 
-#define OP_NEW             (1<<0)
+BIT_ENUM(
-#define OP_RENEW           (1<<1)
+	OP_NEW,
-#define OP_DELETE          (1<<2)
+	OP_RENEW,
-#define OP_FLAGS           (1<<3)
+	OP_DELETE,
-#define  OP_MASK_TYPE      (OP_NEW|OP_RENEW|OP_DELETE|OP_FLAGS) /* asserted in the target ops */
+	OP_FLAGS,
-#define OP_EXPUNGE         (1<<4)
+	OP_EXPUNGE,
-#define OP_CREATE          (1<<5)
+	OP_CREATE,
-#define OP_REMOVE          (1<<6)
+	OP_REMOVE,
-#define XOP_PUSH           (1<<8)
+
-#define XOP_PULL           (1<<9)
+	XOP_PUSH,
-#define  XOP_MASK_DIR      (XOP_PUSH|XOP_PULL)
+	XOP_PULL,
-#define XOP_HAVE_TYPE      (1<<10)  // Aka mode; at least one of dir and type
+	XOP_HAVE_TYPE,  // Aka mode; have at least one of dir and type (see below)
-// The following must all have the same bit shift from the corresponding OP_* flags.
+	// The following must all have the same bit shift from the corresponding OP_* flags.
-#define XOP_HAVE_EXPUNGE   (1<<11)
+	XOP_HAVE_EXPUNGE,
-#define XOP_HAVE_CREATE    (1<<12)
+	XOP_HAVE_CREATE,
-#define XOP_HAVE_REMOVE    (1<<13)
+	XOP_HAVE_REMOVE,
+)
+
+#define OP_MASK_TYPE (OP_NEW | OP_RENEW | OP_DELETE | OP_FLAGS)  // Asserted in the target side ops
+#define XOP_MASK_DIR (XOP_PUSH | XOP_PULL)
 
 typedef struct channel_conf {
 	struct channel_conf *next;

src/sync_p.h

@@ -7,23 +7,28 @@
 #define DEBUG_FLAG DEBUG_SYNC
 
 #include "sync.h"
+#include "sync_p_enum.h"
 
 // This is the (mostly) persistent status of the sync record.
 // Most of these bits are actually mutually exclusive. It is a
 // bitfield to allow for easy testing for multiple states.
-#define S_EXPIRE       (1<<0)  // the entry is being expired (near side message removal scheduled)
+BIT_ENUM(
-#define S_EXPIRED      (1<<1)  // the entry is expired (near side message removal confirmed)
+	S_DEAD,         // ephemeral: the entry was killed and should be ignored
-#define S_PENDING      (1<<2)  // the entry is new and awaits propagation (possibly a retry)
+	S_EXPIRE,       // the entry is being expired (near side message removal scheduled)
-#define S_DUMMY(fn)    (1<<(3+(fn)))  // f/n message is only a placeholder
+	S_EXPIRED,      // the entry is expired (near side message removal confirmed)
-#define S_SKIPPED      (1<<5)  // pre-1.4 legacy: the entry was not propagated (message is too big)
+	S_PENDING,      // the entry is new and awaits propagation (possibly a retry)
-#define S_DEAD         (1<<7)  // ephemeral: the entry was killed and should be ignored
+	S_DUMMY(2),     // f/n message is only a placeholder
+	S_SKIPPED,      // pre-1.4 legacy: the entry was not propagated (message is too big)
+)
 
 // Ephemeral working set.
-#define W_NEXPIRE      (1<<0)  // temporary: new expiration state
+BIT_ENUM(
-#define W_DELETE       (1<<1)  // ephemeral: flags propagation is a deletion
+	W_NEXPIRE,      // temporary: new expiration state
-#define W_DEL(fn)      (1<<(2+(fn)))  // ephemeral: f/n message would be subject to expunge
+	W_DELETE,       // ephemeral: flags propagation is a deletion
-#define W_UPGRADE      (1<<4)  // ephemeral: upgrading placeholder, do not apply MaxSize
+	W_DEL(2),       // ephemeral: f/n message would be subject to expunge
-#define W_PURGE        (1<<5)  // ephemeral: placeholder is being nuked
+	W_UPGRADE,      // ephemeral: upgrading placeholder, do not apply MaxSize
+	W_PURGE,        // ephemeral: placeholder is being nuked
+)
 
 typedef struct sync_rec {
 	struct sync_rec *next;

src/sync_state.c

@@ -13,7 +13,7 @@
 #include <errno.h>
 #include <sys/stat.h>
 
-#define JOURNAL_VERSION "4"
+#define JOURNAL_VERSION "5"
 
 const char *str_fn[] = { "far side", "near side" }, *str_hl[] = { "push", "pull" };