Use new version of cg-base

Signed-off-by: Mattias Andrée <maandree@kth.se>

2 files changed, 700 insertions, 767 deletions

diff --git a/cg-base.c b/cg-base.c
index 9f77937..ad03937 100644
--- a/cg-base.c
+++ b/cg-base.c
@@ -1,20 +1,4 @@
-/**
- * cg-tools -- Cooperative gamma-enabled tools
- * Copyright (C) 2016, 2018  Mattias Andrée (maandree@kth.se)
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+/* See LICENSE file for copyright and license details. */
 #include "cg-base.h"
 
 #include <libclut.h>
@@ -33,7 +17,7 @@
 /**
  * The process's name
  */
-const char* argv0 = NULL;
+const char *argv0 = NULL;
 
 /**
  * The libcoopgamma context
@@ -43,18 +27,18 @@ libcoopgamma_context_t cg;
 /**
  * The names of the selected CRTC:s
  */
-char** crtcs = NULL;
+char **crtcs = NULL;
 
 /**
  * Gamma ramp updates for each CRTC
  */
-filter_update_t* crtc_updates = NULL;
+filter_update_t *crtc_updates = NULL;
 
 /**
  * CRTC and monitor information about
  * each selected CRTC and connect monitor
  */
-libcoopgamma_crtc_info_t* crtc_info = NULL;
+libcoopgamma_crtc_info_t *crtc_info = NULL;
 
 /**
  * The number of selected CRTC:s
@@ -70,7 +54,7 @@ size_t filters_n = 0;
 /**
  * Contexts for asynchronous ramp updates
  */
-static libcoopgamma_async_context_t* asyncs = NULL;
+static libcoopgamma_async_context_t *asyncs = NULL;
 
 /**
  * The number of pending receives
@@ -89,35 +73,35 @@ static int flush_pending = 0;
  */
 struct crtc_sort_data
 {
-  /**
-   * The gamma ramp type
-   */
-  libcoopgamma_depth_t depth;
-  
-  /**
-   * Should be 0
-   */
-  int __padding;
-  
-  /**
-   * The size of the red gamma ramp
-   */
-  size_t red_size;
-  
-  /**
-   * The size of the green gamma ramp
-   */
-  size_t green_size;
-  
-  /**
-   * The size of the blue gamma ramp
-   */
-  size_t blue_size;
-  
-  /**
-   * The index of the CRTC
-   */
-  size_t index;
+	/**
+	 * The gamma ramp type
+	 */
+	libcoopgamma_depth_t depth;
+
+	/**
+	 * Should be 0
+	 */
+	int __padding;
+
+	/**
+	 * The size of the red gamma ramp
+	 */
+	size_t red_size;
+
+	/**
+	 * The size of the green gamma ramp
+	 */
+	size_t green_size;
+
+	/**
+	 * The size of the blue gamma ramp
+	 */
+	size_t blue_size;
+
+	/**
+	 * The index of the CRTC
+	 */
+	size_t index;
 };
 
 
@@ -129,9 +113,10 @@ struct crtc_sort_data
  * @param   b  Return +1 if this string is less than `a`
  * @return     See `a` and `b`, 0 is returned if `a` and `b` are equal
  */
-static int nulstrcmp(const char *a, const char *b)
+static int
+nulstrcmp(const char *a, const char *b)
 {
-  return (a == NULL) ? -1 : strcmp(a, b);
+	return !a ? -1 : strcmp(a, b);
 }
 
 
@@ -142,12 +127,13 @@ static int nulstrcmp(const char *a, const char *b)
  * @param   b_  Return +1 if this one is higher
  * @return      See `a_` and `b_`, only -1 or +1 can be returned
  */
-static int crtc_sort_data_cmp(const void* a_, const void* b_)
+static int
+crtc_sort_data_cmp(const void *a_, const void *b_)
 {
-  const struct crtc_sort_data* a = a_;
-  const struct crtc_sort_data* b = b_;
-  int cmp = memcmp(a, b, sizeof(*a) - sizeof(a->index));
-  return cmp ? cmp : a->index < b->index ? -1 : +1;
+	const struct crtc_sort_data *a = a_;
+	const struct crtc_sort_data *b = b_;
+	int cmp = memcmp(a, b, sizeof(*a) - sizeof(a->index));
+	return cmp ? cmp : a->index < b->index ? -1 : +1;
 }
 
 
@@ -156,62 +142,58 @@ static int crtc_sort_data_cmp(const void* a_, const void* b_)
  * 
  * @return  Zero on success, -1 on error
  */
-int make_slaves(void)
+int
+make_slaves(void)
 {
-  struct crtc_sort_data* data;
-  size_t i, j, n = 0, master = 0, master_i;
-  
-  data = alloca(filters_n * sizeof(*data));
-  memset(data, 0, filters_n * sizeof(*data));
-  for (i = 0; i < filters_n; i++)
-    {
-      if (!(crtc_info[crtc_updates[i].crtc].supported))
-	continue;
-      
-      data[n].depth      = crtc_updates[i].filter.depth;
-      data[n].red_size   = crtc_updates[i].filter.ramps.u8.red_size;
-      data[n].green_size = crtc_updates[i].filter.ramps.u8.green_size;
-      data[n].blue_size  = crtc_updates[i].filter.ramps.u8.blue_size;
-      data[n].index      = i;
-      n++;
-    }
-  
-  qsort(data, n, sizeof(*data), crtc_sort_data_cmp);
-  if (n == 0)
-    return 0;
-  
-  master_i = data[0].index;
-  for (i = 1; i < n; i++)
-    if (memcmp(data + i, data + master, sizeof(*data) - sizeof(data->index)))
-      {
-	if (master + 1 < i)
-	  {
-	    crtc_updates[master_i].slaves = calloc(i - master, sizeof(size_t));
-	    if (crtc_updates[master_i].slaves == NULL)
-	      return -1;
-	    for (j = 1; master + j < i; j++)
-	      crtc_updates[master_i].slaves[j - 1] = data[master + j].index;
-	  }
-	master = i;
-	master_i = data[master].index;
-      }
-    else
-      {
-	libcoopgamma_ramps_destroy(&(crtc_updates[data[i].index].filter.ramps.u8));
-	crtc_updates[data[i].index].master = 0;
-	crtc_updates[data[i].index].filter.ramps.u8 = crtc_updates[master_i].filter.ramps.u8;
-      }
-  
-  if (master + 1 < i)
-    {
-      crtc_updates[master_i].slaves = calloc(i - master, sizeof(size_t));
-      if (crtc_updates[master_i].slaves == NULL)
-	return -1;
-      for (j = 1; master + j < i; j++)
-	crtc_updates[master_i].slaves[j - 1] = data[master + j].index;
-    }
-  
-  return 0;
+	struct crtc_sort_data *data;
+	size_t i, j, n = 0, master = 0, master_i;
+
+	data = alloca(filters_n * sizeof(*data));
+	memset(data, 0, filters_n * sizeof(*data));
+	for (i = 0; i < filters_n; i++) {
+		if (!crtc_info[crtc_updates[i].crtc].supported)
+			continue;
+
+		data[n].depth      = crtc_updates[i].filter.depth;
+		data[n].red_size   = crtc_updates[i].filter.ramps.u8.red_size;
+		data[n].green_size = crtc_updates[i].filter.ramps.u8.green_size;
+		data[n].blue_size  = crtc_updates[i].filter.ramps.u8.blue_size;
+		data[n].index      = i;
+		n++;
+	}
+
+	qsort(data, n, sizeof(*data), crtc_sort_data_cmp);
+	if (!n)
+		return 0;
+
+	master_i = data[0].index;
+	for (i = 1; i < n; i++) {
+		if (memcmp(data + i, data + master, sizeof(*data) - sizeof(data->index))) {
+			if (master + 1 < i) {
+				crtc_updates[master_i].slaves = calloc(i - master, sizeof(size_t));
+				if (!crtc_updates[master_i].slaves)
+					return -1;
+				for (j = 1; master + j < i; j++)
+					crtc_updates[master_i].slaves[j - 1] = data[master + j].index;
+			}
+			master = i;
+			master_i = data[master].index;
+		} else {
+			libcoopgamma_ramps_destroy(&crtc_updates[data[i].index].filter.ramps.u8);
+			crtc_updates[data[i].index].master = 0;
+			crtc_updates[data[i].index].filter.ramps.u8 = crtc_updates[master_i].filter.ramps.u8;
+		}
+	}
+
+	if (master + 1 < i) {
+		crtc_updates[master_i].slaves = calloc(i - master, sizeof(size_t));
+		if (!crtc_updates[master_i].slaves)
+			return -1;
+		for (j = 1; master + j < i; j++)
+			crtc_updates[master_i].slaves[j - 1] = data[master + j].index;
+	}
+
+	return 0;
 }
 
 
@@ -229,31 +211,32 @@ int make_slaves(void)
  * @throws  EINTR   Call to `poll` was interrupted by a signal
  * @throws  EAGAIN  Call to `poll` timed out
  */
-int update_filter(size_t index, int timeout)
+int
+update_filter(size_t index, int timeout)
 {
-  filter_update_t* filter = crtc_updates + index;
-  
-  if (!(filter->synced) || filter->failed)
-    abort();
-  
-  pending_recvs += 1;
-  
-  if (libcoopgamma_set_gamma_send(&(filter->filter), &cg, asyncs + index) < 0)
-    switch (errno)
-      {
-      case EINTR:
-      case EAGAIN:
+	filter_update_t *filter = crtc_updates + index;
+
+	if (!filter->synced || filter->failed)
+		abort();
+
+	pending_recvs += 1;
+
+	if (libcoopgamma_set_gamma_send(&filter->filter, &cg, asyncs + index) < 0) {
+		switch (errno) {
+		case EINTR:
+		case EAGAIN:
 #if EAGAIN != EWOULDBLOCK
-      case EWOULDBLOCK:
+		case EWOULDBLOCK:
 #endif
-	flush_pending = 1;
-	break;
-      default:
-	return -1;
-      }
+			flush_pending = 1;
+			break;
+		default:
+			return -1;
+		}
+	}
   
-  filter->synced = 0;
-  return synchronise(timeout);
+	filter->synced = 0;
+	return synchronise(timeout);
 }
 
 
@@ -270,78 +253,73 @@ int update_filter(size_t index, int timeout)
  * @throws  EINTR   Call to `poll` was interrupted by a signal
  * @throws  EAGAIN  Call to `poll` timed out
  */
-int synchronise(int timeout)
+int
+synchronise(int timeout)
 {
-  struct pollfd pollfd;
-  size_t selected;
-  
-  pollfd.fd = cg.fd;
-  pollfd.events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;
-  if (flush_pending > 0)
-    pollfd.events |= POLLOUT;
-  
-  pollfd.revents = 0;
-  if (poll(&pollfd, (nfds_t)1, timeout) < 0)
-    return -1;
-  
-  if (pollfd.revents & (POLLOUT | POLLERR | POLLHUP | POLLNVAL))
-    {
-      if (libcoopgamma_flush(&cg) < 0)
-	goto sync;
-      flush_pending = 0;
-    }
-  
-  if ((timeout < 0) && (pending_recvs > 0))
-    if (!(pollfd.revents & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)))
-      {
+	struct pollfd pollfd;
+	size_t selected;
+
+	pollfd.fd = cg.fd;
+	pollfd.events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;
+	if (flush_pending > 0)
+		pollfd.events |= POLLOUT;
+
 	pollfd.revents = 0;
-	if (poll(&pollfd, (nfds_t)1, -1) < 0)
-	  return -1;
-      }
-  
+	if (poll(&pollfd, (nfds_t)1, timeout) < 0)
+		return -1;
+
+	if (pollfd.revents & (POLLOUT | POLLERR | POLLHUP | POLLNVAL)) {
+		if (libcoopgamma_flush(&cg) < 0)
+			goto sync;
+		flush_pending = 0;
+	}
+
+	if (timeout < 0 && pending_recvs > 0) {
+		if (!(pollfd.revents & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI))) {
+			pollfd.revents = 0;
+			if (poll(&pollfd, (nfds_t)1, -1) < 0)
+				return -1;
+		}
+	}
+
  sync:
-  if (pollfd.revents & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI | POLLERR | POLLHUP | POLLNVAL))
-    for (;;)
-      {
-	if (libcoopgamma_synchronise(&cg, asyncs, filters_n, &selected) < 0)
-	  {
-	    if (errno == 0)
-	      continue;
-	    else
-	      goto fail;
-	  }
-	if (crtc_updates[selected].synced)
-	  continue;
-	crtc_updates[selected].synced = 1;
-	pending_recvs -= 1;
-	if (libcoopgamma_set_gamma_recv(&cg, asyncs + selected) < 0)
-	  {
-	    if (cg.error.server_side)
-	      {
-		crtc_updates[selected].error = cg.error;
-		crtc_updates[selected].failed = 1;
-		memset(&(cg.error), 0, sizeof(cg.error));
-	      }
-	    else
-	      goto cg_fail;
-	  }
-      }
-  
-  return pending_recvs == 0;
- cg_fail:
-  return -2;
- fail:
-  switch (errno)
-    {
-    case EINTR:
-    case EAGAIN:
+	if (pollfd.revents & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI | POLLERR | POLLHUP | POLLNVAL)) {
+		for (;;) {
+			if (libcoopgamma_synchronise(&cg, asyncs, filters_n, &selected) < 0) {
+				if (!errno)
+					continue;
+				goto fail;
+			}
+			if (crtc_updates[selected].synced)
+				continue;
+			crtc_updates[selected].synced = 1;
+			pending_recvs -= 1;
+			if (libcoopgamma_set_gamma_recv(&cg, asyncs + selected) < 0) {
+				if (cg.error.server_side) {
+					crtc_updates[selected].error = cg.error;
+					crtc_updates[selected].failed = 1;
+					memset(&cg.error, 0, sizeof(cg.error));
+				} else {
+					goto cg_fail;
+				}
+			}
+		}
+	}
+
+	return !pending_recvs;
+cg_fail:
+	return -2;
+fail:
+	switch (errno) {
+	case EINTR:
+	case EAGAIN:
 #if EAGAIN != EWOULDBLOCK
-    case EWOULDBLOCK:
+	case EWOULDBLOCK:
 #endif
-      return pending_recvs == 0;
-    default:
-      return -1;
-    }
+		return !pending_recvs;
+	default:
+		return -1;
+	}
 }
 
 
@@ -351,22 +329,23 @@ int synchronise(int timeout)
  * 
  * @return  Zero on success, -1 on error
  */
-static int initialise_proc(void)
+static int
+initialise_proc(void)
 {
-  sigset_t sigmask;
-  int sig;
-  
-  for (sig = 1; sig < _NSIG; sig++)
-    if (signal(sig, SIG_DFL) == SIG_ERR)
-      if (sig == SIGCHLD)
-	return -1;
-  
-  if (sigemptyset(&sigmask) < 0)
-    return -1;
-  if (sigprocmask(SIG_SETMASK, &sigmask, NULL) < 0)
-    return -1;
-  
-  return 0;
+	sigset_t sigmask;
+	int sig;
+
+	for (sig = 1; sig < _NSIG; sig++)
+		if (signal(sig, SIG_DFL) == SIG_ERR)
+			if (sig == SIGCHLD)
+				return -1;
+
+	if (sigemptyset(&sigmask) < 0)
+		return -1;
+	if (sigprocmask(SIG_SETMASK, &sigmask, NULL) < 0)
+		return -1;
+
+	return 0;
 }
 
 
@@ -376,21 +355,22 @@ static int initialise_proc(void)
  * 
  * @return  Zero on success, -1 on error
  */
-static int list_methods(void)
+static int
+list_methods(void)
 {
-  char** list;
-  size_t i;
-  
-  list = libcoopgamma_get_methods();
-  if (list == NULL)
-    return -1;
-  for (i = 0; list[i]; i++)
-    printf("%s\n", list[i]);
-  free(list);
-  if (fflush(stdout) < 0)
-    return -1;
-  
-  return 0;
+	char **list;
+	size_t i;
+
+	list = libcoopgamma_get_methods();
+	if (!list)
+		return -1;
+	for (i = 0; list[i]; i++)
+		printf("%s\n", list[i]);
+	free(list);
+	if (fflush(stdout) < 0)
+		return -1;
+
+	return 0;
 }
 
 
@@ -403,21 +383,22 @@ static int list_methods(void)
  * @return  Zero on success, -1 on error, -2
  *          on libcoopgamma error
  */
-static int list_crtcs(void)
+static int
+list_crtcs(void)
 {
-  char** list;
-  size_t i;
-  
-  list = libcoopgamma_get_crtcs_sync(&cg);
-  if (list == NULL)
-    return -2;
-  for (i = 0; list[i]; i++)
-    printf("%s\n", list[i]);
-  free(list);
-  if (fflush(stdout) < 0)
-    return -1;
-  
-  return 0;
+	char **list;
+	size_t i;
+
+	list = libcoopgamma_get_crtcs_sync(&cg);
+	if (!list)
+		return -2;
+	for (i = 0; list[i]; i++)
+		printf("%s\n", list[i]);
+	free(list);
+	if (fflush(stdout) < 0)
+		return -1;
+
+	return 0;
 }
 
 
@@ -427,99 +408,97 @@ static int list_crtcs(void)
  * @return  Zero on success, -1 on error, -2
  *          on libcoopgamma error
  */
-static int get_crtc_info(void)
+static int
+get_crtc_info(void)
 {
-  size_t i, unsynced = 0, selected;
-  char* synced;
-  int need_flush = 0;
-  struct pollfd pollfd;
-  
-  synced = alloca(crtcs_n * sizeof(*synced));
-  memset(synced, 0, crtcs_n * sizeof(*synced));
-  
-  i = 0;
-  pollfd.fd = cg.fd;
-  pollfd.events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;
-  
-  while ((unsynced > 0) || (i < crtcs_n))
-    {
-    wait:
-      if (i < crtcs_n)
-	pollfd.events |= POLLOUT;
-      else
-	pollfd.events &= ~POLLOUT;
+	size_t i, unsynced = 0, selected;
+	char *synced;
+	int need_flush = 0;
+	struct pollfd pollfd;
+
+	synced = alloca(crtcs_n * sizeof(*synced));
+	memset(synced, 0, crtcs_n * sizeof(*synced));
+
+	i = 0;
+	pollfd.fd = cg.fd;
+	pollfd.events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;
+
+	while (unsynced > 0 || i < crtcs_n) {
+	wait:
+		if (i < crtcs_n)
+			pollfd.events |= POLLOUT;
+		else
+			pollfd.events &= ~POLLOUT;
       
-      pollfd.revents = 0;
-      if (poll(&pollfd, (nfds_t)1, -1) < 0)
-	goto fail;
+		pollfd.revents = 0;
+		if (poll(&pollfd, (nfds_t)1, -1) < 0)
+			goto fail;
       
-      if (pollfd.revents & (POLLOUT | POLLERR | POLLHUP | POLLNVAL))
-	{
-	  if (need_flush && (libcoopgamma_flush(&cg) < 0))
-	    goto send_fail;
-	  need_flush = 0;
-	  for (; i < crtcs_n; i++)
-	    if (unsynced++, libcoopgamma_get_gamma_info_send(crtcs[i], &cg, asyncs + i) < 0)
-	      goto send_fail;
-	  goto send_done;
-	send_fail:
-	  switch (errno)
-	    {
-	    case EINTR:
-	    case EAGAIN:
+		if (pollfd.revents & (POLLOUT | POLLERR | POLLHUP | POLLNVAL)) {
+			if (need_flush && (libcoopgamma_flush(&cg) < 0))
+				goto send_fail;
+			need_flush = 0;
+			for (; i < crtcs_n; i++)
+				if (unsynced++, libcoopgamma_get_gamma_info_send(crtcs[i], &cg, asyncs + i) < 0)
+					goto send_fail;
+			goto send_done;
+		send_fail:
+			switch (errno) {
+			case EINTR:
+			case EAGAIN:
 #if EAGAIN != EWOULDBLOCK
-	    case EWOULDBLOCK:
+			case EWOULDBLOCK:
 #endif
-	      i++;
-	      need_flush = 1;
-	      break;
-	    default:
-	      goto fail;
-	    }
-	}
-    send_done:
-      
-      if ((unsynced == 0) && (i == crtcs_n))
-	break;
-      
-      if (pollfd.revents & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI))
-	while (unsynced > 0)
-	  switch (libcoopgamma_synchronise(&cg, asyncs, i, &selected))
-	    {
-	    case 0:
-	      if (synced[selected])
-		{
-		  libcoopgamma_skip_message(&cg);
-		  break;
+				i++;
+				need_flush = 1;
+				break;
+			default:
+				goto fail;
+			}
 		}
-	      synced[selected] = 1;
-	      unsynced -= 1;
-	      if (libcoopgamma_get_gamma_info_recv(crtc_info + selected, &cg, asyncs + selected) < 0)
-		goto cg_fail;
-	      break;
-	    case -1:
-	      switch (errno)
-		{
-		case 0:
-		  break;
-		case EINTR:
-		case EAGAIN:
+	send_done:
+
+		if (!unsynced && i == crtcs_n)
+			break;
+      
+		if (pollfd.revents & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
+			while (unsynced > 0) {
+				switch (libcoopgamma_synchronise(&cg, asyncs, i, &selected)) {
+				case 0:
+					if (synced[selected]) {
+						libcoopgamma_skip_message(&cg);
+						break;
+					}
+					synced[selected] = 1;
+					unsynced -= 1;
+					if (libcoopgamma_get_gamma_info_recv(crtc_info + selected, &cg, asyncs + selected) < 0)
+						goto cg_fail;
+					break;
+				case -1:
+					switch (errno)
+						{
+						case 0:
+							break;
+						case EINTR:
+						case EAGAIN:
 #if EAGAIN != EWOULDBLOCK
-		case EWOULDBLOCK:
+						case EWOULDBLOCK:
 #endif
-		  goto wait;
-		default:
-		  goto fail;
+							goto wait;
+						default:
+							goto fail;
+						}
+					break;
+				}
+			}
 		}
-	      break;
-	    }
-    }
-  
-  return 0;
- fail:
-  return -1;
- cg_fail:
-  return -2;
+	}
+
+	return 0;
+fail:
+	return -1;
+cg_fail:
+	return -2;
 }
 
 
@@ -555,373 +534,344 @@ static int get_crtc_info(void)
  * @param   argv  The command line arguments
  * @return        0 on success, 1 on error
  */
-int main(int argc, char* argv[])
+int
+main(int argc, char *argv[])
 {
-  int stage = 0;
-  int dealloc_crtcs = 0;
-  int rc = 0;
-  char* method = NULL;
-  char* site = NULL;
-  size_t crtc_i = 0;
-  int64_t priority = default_priority;
-  char* prio = NULL;
-  char* rule = NULL;
-  char* class = default_class;
-  char** classes = NULL;
-  size_t classes_n = 0;
-  int explicit_crtcs = 0;
-  int have_crtc_q = 0;
-  size_t i, filter_i;
-  
-  argv0 = *argv++, argc--;
-  
-  if (initialise_proc() < 0)
-    goto fail;
-  
-  crtcs = alloca(argc * sizeof(*crtcs));
-  
-  for (; *argv; argv++, argc--)
-    {
-      char* args = *argv;
-      char opt[3];
-      if (!strcmp(args, "--"))
-	{
-	  argv++, argc--;
-	  break;
+	int stage = 0;
+	int dealloc_crtcs = 0;
+	int rc = 0;
+	char *method = NULL;
+	char *site = NULL;
+	size_t crtc_i = 0;
+	int64_t priority = default_priority;
+	char *prio = NULL;
+	char *rule = NULL;
+	char *class = default_class;
+	char **classes = NULL;
+	size_t classes_n = 0;
+	int explicit_crtcs = 0;
+	int have_crtc_q = 0;
+	size_t i, filter_i;
+	const char *side, *crtc;
+	size_t len, n;
+	char *args, *arg, *end, *p, opt[3];
+	int at_end;
+
+	argv0 = *argv++, argc--;
+
+	if (initialise_proc() < 0)
+		goto fail;
+
+	crtcs = alloca((size_t)argc * sizeof(*crtcs));
+
+	for (; *argv; argv++, argc--) {
+		args = *argv;
+		if (!strcmp(args, "--")) {
+			argv++, argc--;
+			break;
+		}
+		opt[0] = *args++;
+		opt[2] = '\0';
+		if (*opt != '-' && *opt != '+')
+			break;
+		if (!*args)
+			break;
+		while (*args) {
+			opt[1] = *args++;
+			arg = args;
+			if ((at_end = !*arg))
+				arg = argv[1];
+			if (!strcmp(opt, "-M")) {
+				if (method || !(method = arg))
+					usage();
+			} else if (!strcmp(opt, "-S")) {
+				if (site || !(site = arg))
+					usage();
+			} else if (!strcmp(opt, "-c")) {
+				if (!arg)
+					usage();
+				crtcs[crtc_i++] = arg;
+				explicit_crtcs = 1;
+				if (!have_crtc_q && !strcmp(arg, "?"))
+					have_crtc_q = 1;
+			} else if (!strcmp(opt, "-p")) {
+				if (prio || !(prio = arg))
+					usage();
+			} else if (!strcmp(opt, "-R")) {
+				if (rule || !(rule = arg))
+					usage();
+			} else {
+				switch (handle_opt(opt, arg)) {
+				case 0:
+					goto next_opt;
+				case 1:
+					break;
+				default:
+					goto fail;
+				}
+			}
+			argv += at_end;
+			argc -= at_end;
+			break;
+		next_opt:;
+		}
 	}
-      opt[0] = *args++;
-      opt[2] = '\0';
-      if ((*opt != '-') && (*opt != '+'))
-	break;
-      while (*args)
-	{
-	  char* arg;
-	  int at_end;
-	  opt[1] = *args++;
-	  arg = args;
-	  if ((at_end = !*arg))
-	    arg = argv[1];
-	  if (!strcmp(opt, "-M"))
-	    {
-	      if ((method != NULL) || ((method = arg) == NULL))
-		usage();
-	    }
-	  else if (!strcmp(opt, "-S"))
-	    {
-	      if ((site != NULL) || ((site = arg) == NULL))
-		usage();
-	    }
-	  else if (!strcmp(opt, "-c"))
-	    {
-	      if (arg == NULL)
-		usage();
-	      crtcs[crtc_i++] = arg;
-	      explicit_crtcs = 1;
-	      if (!have_crtc_q && !strcmp(arg, "?"))
-		have_crtc_q = 1;
-	    }
-	  else if (!strcmp(opt, "-p"))
-	    {
-	      if ((prio != NULL) || ((prio = arg) == NULL))
-		usage();
-	    }
-	  else if (!strcmp(opt, "-R"))
-	    {
-	      if ((rule != NULL) || ((rule = arg) == NULL))
-		usage();
-	    }
-	  else
-	    switch (handle_opt(opt, arg))
-	      {
-	      case 0:
-		goto next_opt;
-	      case 1:
-		break;
-	      default:
+
+	crtcs_n = crtc_i;
+	crtcs[crtc_i] = NULL;
+	if (!have_crtc_q && nulstrcmp(method, "?") &&
+	    nulstrcmp(rule, "?") && nulstrcmp(rule, "??") &&
+	    (default_priority == NO_DEFAULT_PRIORITY || nulstrcmp(prio, "?")))
+		if (handle_args(argc, argv, prio) < 0)
+			goto fail;
+
+	if (default_priority != NO_DEFAULT_PRIORITY) {
+		if (!nulstrcmp(prio, "?")) {
+			printf("%" PRIi64 "\n", priority);
+			return 0;
+		} else if (prio) {
+			errno = 0;
+			priority = (int64_t)strtoll(prio, &end, 10);
+			if (errno || *end || !*prio)
+				usage();
+		}
+	}
+
+	if (!nulstrcmp(rule, "??")) {
+		if (!*class_suffixes)
+			printf("%s\n", class);
+		else
+			for (i = 0; class_suffixes[i]; i++)
+				printf("%s%s\n", class, class_suffixes[i]);
+		return 0;
+	} else if (!nulstrcmp(rule, "?")) {
+		printf("%s\n", strstr(strstr(class, "::") + 2, "::") + 2);
+		return 0;
+	} else if (rule) {
+		p = strstr(strstr(class, "::") + 2, "::") + 2;
+		n = (size_t)(p - class);
+		class = alloca(strlen(rule) + n + (size_t)1);
+		memcpy(class, default_class, n);
+		strcpy(class + n, rule);
+		if (strchr(class, '\n')) {
+			fprintf(stderr, "%s: LF character is not allowed in the filter's class\n", argv0);
+			goto custom_fail;
+		}
+	}
+
+	if (!nulstrcmp(method, "?")) {
+		if (list_methods() < 0)
+			goto fail;
+		return 0;
+	}
+
+	if (libcoopgamma_context_initialise(&cg) < 0)
 		goto fail;
-	      }
-	  argv += at_end;
-	  argc -= at_end;
-	  break;
-	next_opt:;
+	stage++;
+	if (libcoopgamma_connect(method, site, &cg) < 0) {
+		fprintf(stderr, "%s: server failed to initialise\n", argv0);
+		goto custom_fail;
 	}
-    }
-  
-  crtcs_n = crtc_i;
-  crtcs[crtc_i] = NULL;
-  if (!have_crtc_q && nulstrcmp(method, "?") &&
-      nulstrcmp(rule, "?") && nulstrcmp(rule, "??") &&
-      ((default_priority == NO_DEFAULT_PRIORITY) || nulstrcmp(prio, "?")))
-    if (handle_args(argc, argv, prio) < 0)
-      goto fail;
-  
-  if (default_priority != NO_DEFAULT_PRIORITY)
-    {
-      if (!nulstrcmp(prio, "?"))
-	{
-	  printf("%" PRIi64 "\n", priority);
-	  return 0;
+	stage++;
+
+	if (have_crtc_q) {
+		switch (list_crtcs()) {
+		case 0:
+			goto done;
+		case -1:
+			goto fail;
+		default:
+			goto cg_fail;
+		}
 	}
-      else if (prio != NULL)
-	{
-	  char *end;
-	  errno = 0;
-	  priority = (int64_t)strtoll(prio, &end, 10);
-	  if (errno || *end || !*prio)
-	    usage();
+
+	if (!crtcs_n) {
+		crtcs = libcoopgamma_get_crtcs_sync(&cg);
+		if (!crtcs)
+			goto cg_fail;
+		dealloc_crtcs = 1;
+		for (; crtcs[crtcs_n]; crtcs_n++);
 	}
-    }
-  
-  if (!nulstrcmp(rule, "??"))
-    {
-      size_t i;
-      if (*class_suffixes == NULL)
-	printf("%s\n", class);
-      else
-	for (i = 0; class_suffixes[i] != NULL; i++)
-	  printf("%s%s\n", class, class_suffixes[i]);
-      return 0;
-    }
-  else if (!nulstrcmp(rule, "?"))
-    {
-      printf("%s\n", strstr(strstr(class, "::") + 2, "::") + 2);
-      return 0;
-    }
-  else if (rule != NULL)
-    {
-      char* p = strstr(strstr(class, "::") + 2, "::") + 2;
-      size_t n = (size_t)(p - class);
-      class = alloca(strlen(rule) + n + (size_t)1);
-      memcpy(class, default_class, n);
-      strcpy(class + n, rule);
-      if (strchr(class, '\n'))
-	{
-	  fprintf(stderr, "%s: LF character is not allowed in the filter's class\n", argv0);
-	  goto custom_fail;
+
+	if (!crtcs_n) {
+		fprintf(stderr, "%s: no CRTC:s are available\n", argv0);
+		goto custom_fail;
 	}
-    }
-  
-  if (!nulstrcmp(method, "?"))
-    {
-      if (list_methods() < 0)
-	goto fail;
-      return 0;
-    }
-  
-  if (libcoopgamma_context_initialise(&cg) < 0)
-    goto fail;
-  stage++;
-  if (libcoopgamma_connect(method, site, &cg) < 0)
-    {
-      fprintf(stderr, "%s: server failed to initialise\n", argv0);
-      goto custom_fail;
-    }
-  stage++;
-  
-  if (have_crtc_q)
-    switch (list_crtcs())
-      {
-      case 0:
-	goto done;
-      case -1:
-	goto fail;
-      default:
-	goto cg_fail;
-      }
-  
-  if (crtcs_n == 0)
-    {
-      crtcs = libcoopgamma_get_crtcs_sync(&cg);
-      if (crtcs == NULL)
-	goto cg_fail;
-      dealloc_crtcs = 1;
-      for (; crtcs[crtcs_n] != NULL; crtcs_n++);
-    }
-  
-  if (crtcs_n == 0)
-    {
-      fprintf(stderr, "%s: no CRTC:s are available\n", argv0);
-      goto custom_fail;
-    }
-  
-  if (*class_suffixes == NULL)
-    {
-      classes = &class;
-      classes_n = 1;
-    }
-  else
-    {
-      size_t len = strlen(class);
-      while (class_suffixes[classes_n])
-	classes_n++;
-      classes = alloca(classes_n * sizeof(*classes));
-      for (i = 0; i < classes_n; i++)
-	{
-	  classes[i] = alloca(len + strlen(class_suffixes[i]) + sizeof(":"));
-	  stpcpy(stpcpy(stpcpy(classes[i], class), ":"), class_suffixes[i]);
+	
+	if (!*class_suffixes) {
+		classes = &class;
+		classes_n = 1;
+	} else {
+		len = strlen(class);
+		while (class_suffixes[classes_n])
+			classes_n++;
+		classes = alloca(classes_n * sizeof(*classes));
+		for (i = 0; i < classes_n; i++) {
+			classes[i] = alloca(len + strlen(class_suffixes[i]) + sizeof(":"));
+			stpcpy(stpcpy(stpcpy(classes[i], class), ":"), class_suffixes[i]);
+		}
 	}
-    }
-  filters_n = classes_n * crtcs_n;
-  
-  crtc_info = alloca(crtcs_n * sizeof(*crtc_info));
-  memset(crtc_info, 0, crtcs_n * sizeof(*crtc_info));
-  for (crtc_i = 0; crtc_i < crtcs_n; crtc_i++)
-    if (libcoopgamma_crtc_info_initialise(crtc_info + crtc_i) < 0)
-      goto cg_fail;
-  
-  if (libcoopgamma_set_nonblocking(&cg, 1) < 0)
-    goto fail;
-  
-  asyncs = alloca(filters_n * sizeof(*asyncs));
-  memset(asyncs, 0, filters_n * sizeof(*asyncs));
-  for (filter_i = 0; filter_i < filters_n; filter_i++)
-    if (libcoopgamma_async_context_initialise(asyncs + filter_i) < 0)
-      goto fail;
-  
-  switch (get_crtc_info())
-    {
-    case 0:
-      break;
-    case -1:
-      goto fail;
-    case -2:
-      goto cg_fail;
-    }
-  
-  for (crtc_i = 0; crtc_i < crtcs_n; crtc_i++)
-    {
-      if (explicit_crtcs && !(crtc_info[crtc_i].supported))
-	fprintf(stderr, "%s: warning: gamma adjustments not supported on CRTC: %s\n",
-		argv0, crtcs[crtc_i]);
-      if (crtc_info[crtc_i].cooperative == 0)
-	fprintf(stderr, "%s: warning: cooperative gamma server not running for CRTC: %s\n",
-		argv0, crtcs[crtc_i]);
-    }
-  
-  crtc_updates = alloca(filters_n * sizeof(*crtc_updates));
-  memset(crtc_updates, 0, filters_n * sizeof(*crtc_updates));
-  for (filter_i = i = 0; i < classes_n; i++)
-    for (crtc_i = 0; crtc_i < crtcs_n; crtc_i++, filter_i++)
-      {
-	if (libcoopgamma_filter_initialise(&(crtc_updates[filter_i].filter)) < 0)
-	  goto fail;
-	if (libcoopgamma_error_initialise(&(crtc_updates[filter_i].error)) < 0)
-	  goto fail;
-	crtc_updates[filter_i].crtc = crtc_i;
-	crtc_updates[filter_i].synced = 1;
-	crtc_updates[filter_i].failed = 0;
-	crtc_updates[filter_i].master = 1;
-	crtc_updates[filter_i].slaves = NULL;
-	crtc_updates[filter_i].filter.crtc                = crtcs[crtc_i];
-	crtc_updates[filter_i].filter.class               = classes[i];
-	crtc_updates[filter_i].filter.priority            = priority;
-	crtc_updates[filter_i].filter.depth               = crtc_info[crtc_i].depth;
-	crtc_updates[filter_i].filter.ramps.u8.red_size   = crtc_info[crtc_i].red_size;
-	crtc_updates[filter_i].filter.ramps.u8.green_size = crtc_info[crtc_i].green_size;
-	crtc_updates[filter_i].filter.ramps.u8.blue_size  = crtc_info[crtc_i].blue_size;
-	switch (crtc_updates[filter_i].filter.depth)
-	  {
+	filters_n = classes_n * crtcs_n;
+
+	crtc_info = alloca(crtcs_n * sizeof(*crtc_info));
+	memset(crtc_info, 0, crtcs_n * sizeof(*crtc_info));
+	for (crtc_i = 0; crtc_i < crtcs_n; crtc_i++)
+		if (libcoopgamma_crtc_info_initialise(crtc_info + crtc_i) < 0)
+			goto cg_fail;
+
+	if (libcoopgamma_set_nonblocking(&cg, 1) < 0)
+		goto fail;
+
+	asyncs = alloca(filters_n * sizeof(*asyncs));
+	memset(asyncs, 0, filters_n * sizeof(*asyncs));
+	for (filter_i = 0; filter_i < filters_n; filter_i++)
+		if (libcoopgamma_async_context_initialise(asyncs + filter_i) < 0)
+			goto fail;
+
+	switch (get_crtc_info()) {
+	case 0:
+		break;
+	case -1:
+		goto fail;
+	case -2:
+		goto cg_fail;
+	}
+
+	for (crtc_i = 0; crtc_i < crtcs_n; crtc_i++) {
+		if (explicit_crtcs && !crtc_info[crtc_i].supported) {
+			fprintf(stderr, "%s: warning: gamma adjustments not supported on CRTC: %s\n",
+			        argv0, crtcs[crtc_i]);
+		}
+		if (!crtc_info[crtc_i].cooperative) {
+			fprintf(stderr, "%s: warning: cooperative gamma server not running for CRTC: %s\n",
+			        argv0, crtcs[crtc_i]);
+		}
+	}
+
+	crtc_updates = alloca(filters_n * sizeof(*crtc_updates));
+	memset(crtc_updates, 0, filters_n * sizeof(*crtc_updates));
+	for (filter_i = i = 0; i < classes_n; i++) {
+		for (crtc_i = 0; crtc_i < crtcs_n; crtc_i++, filter_i++) {
+			if (libcoopgamma_filter_initialise(&crtc_updates[filter_i].filter) < 0)
+				goto fail;
+			if (libcoopgamma_error_initialise(&crtc_updates[filter_i].error) < 0)
+				goto fail;
+			crtc_updates[filter_i].crtc = crtc_i;
+			crtc_updates[filter_i].synced = 1;
+			crtc_updates[filter_i].failed = 0;
+			crtc_updates[filter_i].master = 1;
+			crtc_updates[filter_i].slaves = NULL;
+			crtc_updates[filter_i].filter.crtc                = crtcs[crtc_i];
+			crtc_updates[filter_i].filter.class               = classes[i];
+			crtc_updates[filter_i].filter.priority            = priority;
+			crtc_updates[filter_i].filter.depth               = crtc_info[crtc_i].depth;
+			crtc_updates[filter_i].filter.ramps.u8.red_size   = crtc_info[crtc_i].red_size;
+			crtc_updates[filter_i].filter.ramps.u8.green_size = crtc_info[crtc_i].green_size;
+			crtc_updates[filter_i].filter.ramps.u8.blue_size  = crtc_info[crtc_i].blue_size;
+			switch (crtc_updates[filter_i].filter.depth) {
 #define X(CONST, MEMBER, MAX, TYPE)\
-	    case CONST:\
-	      libcoopgamma_ramps_initialise(&(crtc_updates[filter_i].filter.ramps.MEMBER));\
-	      libclut_start_over(&(crtc_updates[filter_i].filter.ramps.MEMBER), MAX, TYPE, 1, 1, 1);\
-	      break;
-LIST_DEPTHS
+			case CONST:\
+				libcoopgamma_ramps_initialise(&crtc_updates[filter_i].filter.ramps.MEMBER);\
+				libclut_start_over(&crtc_updates[filter_i].filter.ramps.MEMBER, MAX, TYPE, 1, 1, 1);\
+				break;
+			LIST_DEPTHS
 #undef X
-	  default:
-	    fprintf(stderr, "%s: internal error: gamma ramp type is unrecognised: %i\n",
-		    argv0, crtc_updates[filter_i].filter.depth);
-	    goto custom_fail;
-	  }
-      }
-  
-  switch (start())
-    {
-    case 0:
-      break;
-    case -1:
-      goto fail;
-    case -2:
-      goto cg_fail;
-    case -3:
-      goto custom_fail;
-    }
-  
-  for (filter_i = 0; filter_i < filters_n; filter_i++)
-    if (crtc_updates[filter_i].failed)
-      {
-	const char* side = cg.error.server_side ? "server" : "client";
-	const char* crtc = crtc_updates[filter_i].filter.crtc;
-	if (cg.error.custom)
-	  {
-	    if ((cg.error.number != 0) && (cg.error.description != NULL))
-	      fprintf(stderr, "%s: %s-side error number %" PRIu64 " for CRTC %s: %s\n",
-		      argv0, side, cg.error.number, crtc, cg.error.description);
-	    else if (cg.error.number != 0)
-	      fprintf(stderr, "%s: %s-side error number %" PRIu64 " for CRTC %s\n",
-		      argv0, side, cg.error.number, crtc);
-	    else if (cg.error.description != NULL)
-	      fprintf(stderr, "%s: %s-side error for CRTC %s: %s\n", argv0, side, crtc, cg.error.description);
-	  }
-	else if (cg.error.description != NULL)
-	  fprintf(stderr, "%s: %s-side error for CRTC %s: %s\n", argv0, side, crtc, cg.error.description);
-	else
-	  fprintf(stderr, "%s: %s-side error for CRTC %s: %s\n", argv0, side, crtc, strerror(cg.error.number));
-      }
-  
- done:
-  if (dealloc_crtcs)
-    free(crtcs);
-  if (crtc_info != NULL)
-    for (crtc_i = 0; crtc_i < crtcs_n; crtc_i++)
-      libcoopgamma_crtc_info_destroy(crtc_info + crtc_i);
-  if (asyncs != NULL)
-    for (filter_i = 0; filter_i < filters_n; filter_i++)
-      libcoopgamma_async_context_destroy(asyncs + filter_i);
-  if (stage >= 1)
-    libcoopgamma_context_destroy(&cg, stage >= 2);
-  if (crtc_updates != NULL)
-    for (filter_i = 0; filter_i < filters_n; filter_i++)
-      {
-	if (crtc_updates[filter_i].master == 0)
-	  memset(&(crtc_updates[filter_i].filter.ramps.u8), 0, sizeof(crtc_updates[filter_i].filter.ramps.u8));
-	crtc_updates[filter_i].filter.crtc = NULL;
-	crtc_updates[filter_i].filter.class = NULL;
-	libcoopgamma_filter_destroy(&(crtc_updates[filter_i].filter));
-	libcoopgamma_error_destroy(&(crtc_updates[filter_i].error));
-	free(crtc_updates[filter_i].slaves);
-      }
-  return rc;
-  
- custom_fail:
-  rc = 1;
-  goto done;
-  
- fail:
-  rc = 1;
-  if (errno)
-    perror(argv0);
-  goto done;
-  
- cg_fail:
-  rc = 1;
-  {
-    const char* side = cg.error.server_side ? "server" : "client";
-    if (cg.error.custom)
-      {
-	if ((cg.error.number != 0) && (cg.error.description != NULL))
-	  fprintf(stderr, "%s: %s-side error number %" PRIu64 ": %s\n",
-		  argv0, side, cg.error.number, cg.error.description);
-	else if (cg.error.number != 0)
-	  fprintf(stderr, "%s: %s-side error number %" PRIu64 "\n", argv0, side, cg.error.number);
-	else if (cg.error.description != NULL)
-	  fprintf(stderr, "%s: %s-side error: %s\n", argv0, side, cg.error.description);
-      }
-    else if (cg.error.description != NULL)
-      fprintf(stderr, "%s: %s-side error: %s\n", argv0, side, cg.error.description);
-    else
-      fprintf(stderr, "%s: %s-side error: %s\n", argv0, side, strerror(cg.error.number));
-  }
-  goto done;
-}
+			default:
+				fprintf(stderr, "%s: internal error: gamma ramp type is unrecognised: %i\n",
+				        argv0, crtc_updates[filter_i].filter.depth);
+				goto custom_fail;
+			}
+		}
+	}
+
+	switch (start()) {
+	case 0:
+		break;
+	case -1:
+		goto fail;
+	case -2:
+		goto cg_fail;
+	case -3:
+		goto custom_fail;
+	}
+
+	for (filter_i = 0; filter_i < filters_n; filter_i++) {
+		if (crtc_updates[filter_i].failed) {
+			side = cg.error.server_side ? "server" : "client";
+			crtc = crtc_updates[filter_i].filter.crtc;
+			if (cg.error.custom) {
+				if (cg.error.number && cg.error.description) {
+					fprintf(stderr, "%s: %s-side error number %" PRIu64 " for CRTC %s: %s\n",
+						argv0, side, cg.error.number, crtc, cg.error.description);
+				} else if (cg.error.number) {
+					fprintf(stderr, "%s: %s-side error number %" PRIu64 " for CRTC %s\n",
+						argv0, side, cg.error.number, crtc);
+				} else if (cg.error.description) {
+					fprintf(stderr, "%s: %s-side error for CRTC %s: %s\n",
+						argv0, side, crtc, cg.error.description);
+				}
+			} else if (cg.error.description) {
+				fprintf(stderr, "%s: %s-side error for CRTC %s: %s\n",
+				        argv0, side, crtc, cg.error.description);
+			} else {
+				fprintf(stderr, "%s: %s-side error for CRTC %s: %s\n",
+				        argv0, side, crtc, strerror((int)cg.error.number));
+			}
+		}
+	}
 
+done:
+	if (dealloc_crtcs)
+		free(crtcs);
+	if (crtc_info)
+		for (crtc_i = 0; crtc_i < crtcs_n; crtc_i++)
+			libcoopgamma_crtc_info_destroy(crtc_info + crtc_i);
+	if (asyncs)
+		for (filter_i = 0; filter_i < filters_n; filter_i++)
+			libcoopgamma_async_context_destroy(asyncs + filter_i);
+	if (stage >= 1)
+		libcoopgamma_context_destroy(&cg, stage >= 2);
+	if (crtc_updates) {
+		for (filter_i = 0; filter_i < filters_n; filter_i++) {
+			if (!crtc_updates[filter_i].master) {
+				memset(&crtc_updates[filter_i].filter.ramps.u8, 0,
+				       sizeof(crtc_updates[filter_i].filter.ramps.u8));
+			}
+			crtc_updates[filter_i].filter.crtc = NULL;
+			crtc_updates[filter_i].filter.class = NULL;
+			libcoopgamma_filter_destroy(&crtc_updates[filter_i].filter);
+			libcoopgamma_error_destroy(&crtc_updates[filter_i].error);
+			free(crtc_updates[filter_i].slaves);
+		}
+	}
+	return rc;
+
+custom_fail:
+	rc = 1;
+	goto done;
+
+fail:
+	rc = 1;
+	if (errno)
+		perror(argv0);
+	goto done;
+
+cg_fail:
+	rc = 1;
+	side = cg.error.server_side ? "server" : "client";
+	if (cg.error.custom) {
+		if (cg.error.number && cg.error.description) {
+			fprintf(stderr, "%s: %s-side error number %" PRIu64 ": %s\n",
+			        argv0, side, cg.error.number, cg.error.description);
+		} else if (cg.error.number) {
+			fprintf(stderr, "%s: %s-side error number %" PRIu64 "\n", argv0, side, cg.error.number);
+		} else if (cg.error.description) {
+			fprintf(stderr, "%s: %s-side error: %s\n", argv0, side, cg.error.description);
+		}
+	} else if (cg.error.description) {
+		fprintf(stderr, "%s: %s-side error: %s\n", argv0, side, cg.error.description);
+	} else {
+		fprintf(stderr, "%s: %s-side error: %s\n", argv0, side, strerror((int)cg.error.number));
+	}
+	goto done;
+}
diff --git a/cg-base.h b/cg-base.h
index cd885e7..9913f91 100644
--- a/cg-base.h
+++ b/cg-base.h
@@ -1,20 +1,4 @@
-/**
- * cg-tools -- Cooperative gamma-enabled tools
- * Copyright (C) 2016  Mattias Andrée (maandree@kth.se)
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+/* See LICENSE file for copyright and license details. */
 #include <libcoopgamma.h>
 
 #include <inttypes.h>
@@ -25,7 +9,7 @@
  * Value of `default_priority` that indicates
  * that there is no default priority
  */
-#define NO_DEFAULT_PRIORITY  INT64_MAX
+#define NO_DEFAULT_PRIORITY INT64_MAX
 
 
 
@@ -40,12 +24,12 @@
  * 4)  The type of the ramp stops
  */
 #define LIST_DEPTHS\
-  X(LIBCOOPGAMMA_UINT8,  u8,  UINT8_MAX,   uint8_t)\
-  X(LIBCOOPGAMMA_UINT16, u16, UINT16_MAX,  uint16_t)\
-  X(LIBCOOPGAMMA_UINT32, u32, UINT32_MAX,  uint32_t)\
-  X(LIBCOOPGAMMA_UINT64, u64, UINT64_MAX,  uint64_t)\
-  X(LIBCOOPGAMMA_FLOAT,  f,   ((float)1),  float)\
-  X(LIBCOOPGAMMA_DOUBLE, d,   ((double)1), double)
+	X(LIBCOOPGAMMA_UINT8,  u8,  UINT8_MAX,   uint8_t)\
+	X(LIBCOOPGAMMA_UINT16, u16, UINT16_MAX,  uint16_t)\
+	X(LIBCOOPGAMMA_UINT32, u32, UINT32_MAX,  uint32_t)\
+	X(LIBCOOPGAMMA_UINT64, u64, UINT64_MAX,  uint64_t)\
+	X(LIBCOOPGAMMA_FLOAT,  f,   ((float)1),  float)\
+	X(LIBCOOPGAMMA_DOUBLE, d,   ((double)1), double)
 
 
 
@@ -55,54 +39,54 @@
  */
 typedef struct filter_update
 {
-  /**
-   * The filter to update
-   * 
-   * `.filter.crtc`, `.filter.class`, and
-   * `.filter.priority` (unless `default_priority`
-   * is `NO_DEFAULT_PRIORITY`), `.filter.depth`
-   * are preconfigured, and `.filter.ramps`
-   * is preinitialised and preset to an
-   * identity ramp
-   */
-  libcoopgamma_filter_t filter;
-  
-  /**
-   * The index of the CRTC
-   */
-  size_t crtc;
-  
-  /**
-   * Has the update been synchronised?
-   */
-  int synced;
-  
-  /**
-   * Did the update fail?
-   */
-  int failed;
-  
-  /**
-   * Error description if `.failed` is true
-   */
-  libcoopgamma_error_t error;
-  
-  /**
-   * If zero, the ramps in `.filter` shall
-   * neither be modified nor freed
-   */
-  int master;
-  
-  /**
-   * 0-terminated list of elements in
-   * `.crtc_updates` which shares gamma
-   * ramps with this instance
-   * 
-   * This will only be set if `.master`
-   * is true
-   */
-  size_t* slaves;
-  
+	/**
+	 * The filter to update
+	 * 
+	 * `.filter.crtc`, `.filter.class`, and
+	 * `.filter.priority` (unless `default_priority`
+	 * is `NO_DEFAULT_PRIORITY`), `.filter.depth`
+	 * are preconfigured, and `.filter.ramps`
+	 * is preinitialised and preset to an
+	 * identity ramp
+	 */
+	libcoopgamma_filter_t filter;
+
+	/**
+	 * The index of the CRTC
+	 */
+	size_t crtc;
+
+	/**
+	 * Has the update been synchronised?
+	 */
+	int synced;
+
+	/**
+	 * Did the update fail?
+	 */
+	int failed;
+
+	/**
+	 * Error description if `.failed` is true
+	 */
+	libcoopgamma_error_t error;
+
+	/**
+	 * If zero, the ramps in `.filter` shall
+	 * neither be modified nor freed
+	 */
+	int master;
+
+	/**
+	 * 0-terminated list of elements in
+	 * `.crtc_updates` which shares gamma
+	 * ramps with this instance
+	 * 
+	 * This will only be set if `.master`
+	 * is true
+	 */
+	size_t *slaves;
+
 } filter_update_t;
 
 
@@ -110,7 +94,7 @@ typedef struct filter_update
 /**
  * The process's name
  */
-extern const char* argv0;
+extern const char *argv0;
 
 /**
  * The libcoopgamma context
@@ -120,18 +104,18 @@ extern libcoopgamma_context_t cg;
 /**
  * The names of the selected CRTC:s
  */
-extern char** crtcs;
+extern char **crtcs;
 
 /**
  * Gamma ramp updates for each CRTC
  */
-extern filter_update_t* crtc_updates;
+extern filter_update_t *crtc_updates;
 
 /**
  * CRTC and monitor information about
  * each selected CRTC and connect monitor
  */
-extern libcoopgamma_crtc_info_t* crtc_info;
+extern libcoopgamma_crtc_info_t *crtc_info;
 
 /**
  * The number of selected CRTC:s
@@ -158,7 +142,7 @@ extern char default_class[];
 /**
  * Class suffixes
  */
-extern const char* const* class_suffixes;
+extern const char *const *class_suffixes;
 
 
 
@@ -226,7 +210,7 @@ extern void usage(void);
 #if defined(__GNUC__)
 __attribute__((__nonnull__(1)))
 #endif
-extern int handle_opt(char* opt, char* arg);
+extern int handle_opt(char *opt, char *arg);
 
 /**
  * This function is called after the last
@@ -240,7 +224,7 @@ extern int handle_opt(char* opt, char* arg);
 #if defined(__GNUC__)
 __attribute__((__nonnull__(2)))
 #endif
-extern int handle_args(int argc, char* argv[], char* prio);
+extern int handle_args(int argc, char *argv[], char *prio);
 
 /**
  * The main function for the program-specific code
@@ -251,4 +235,3 @@ extern int handle_args(int argc, char* argv[], char* prio);
  *          -3: Error, message already printed
  */
 extern int start(void);
-