Move glib-ectomy.[ch] into the common directory

3 files changed, 280 insertions, 1 deletions

diff --git a/common/Makefile.am b/common/Makefile.am
index 71592813..5a5a4702 100644
--- a/common/Makefile.am
+++ b/common/Makefile.am
@@ -1,8 +1,10 @@
 
-noinst_LIBRARIES = libtextfile.a
+noinst_LIBRARIES = libtextfile.a libglib-ectomy.a
 
 libtextfile_a_SOURCES = textfile.h textfile.c
 
+libglib_ectomy_a_SOURCES = glib-ectomy.h glib-ectomy.c
+
 noinst_PROGRAMS = test_textfile
 
 test_textfile_LDADD = libtextfile.a
diff --git a/common/glib-ectomy.c b/common/glib-ectomy.c
new file mode 100644
index 00000000..bea7f47c
--- /dev/null
+++ b/common/glib-ectomy.c
@@ -0,0 +1,185 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <malloc.h>
+#include <string.h>
+#include <limits.h>
+
+#include "glib-ectomy.h"
+
+GIOError g_io_channel_read(GIOChannel *channel, gchar *buf, gsize count, gsize *bytes_read)
+{
+	int fd = channel->fd;
+	gssize result;
+
+	/* At least according to the Debian manpage for read */
+	if (count > SSIZE_MAX)
+		count = SSIZE_MAX;
+
+retry:
+	result = read (fd, buf, count);
+
+	if (result < 0) {
+		*bytes_read = 0;
+
+		switch (errno) {
+#ifdef EINTR
+		case EINTR:
+			goto retry;
+#endif
+#ifdef EAGAIN
+		case EAGAIN:
+			return G_IO_STATUS_AGAIN;
+#endif
+		default:
+			return G_IO_STATUS_ERROR;
+		}
+	}
+
+	*bytes_read = result;
+
+	return (result > 0) ? G_IO_STATUS_NORMAL : G_IO_STATUS_EOF;
+}
+
+void g_io_channel_close(GIOChannel *channel)
+{
+	if (!channel)
+		return;
+
+	close(channel->fd);
+
+	memset(channel, 0, sizeof(channel));
+	free(channel);
+}
+
+GIOChannel *g_io_channel_unix_new(int fd)
+{
+	GIOChannel *channel;
+
+	channel = malloc(sizeof(GIOChannel));
+	if (!channel)
+		return NULL;
+
+	channel->fd = fd;
+
+	return channel;
+}
+
+gint g_io_channel_unix_get_fd(GIOChannel *channel)
+{
+	return channel->fd;
+}
+
+struct watch {
+	guint id;
+	GIOChannel *channel;
+	GIOCondition condition;
+	GIOFunc func;
+	gpointer user_data;
+
+	struct watch *next;
+};
+
+static struct watch watch_head = { .id = 0, .next = 0 };
+
+void g_io_remove_watch(guint id)
+{
+	struct watch *w, *p;
+
+	for (p = &watch_head, w = watch_head.next; w; w = w->next)
+		if (w->id == id) {
+			p->next = w->next;
+			free (w);
+			return;
+		}
+}
+
+guint g_io_add_watch(GIOChannel *channel, GIOCondition condition, GIOFunc func, gpointer user_data)
+{
+	struct watch *watch = malloc(sizeof(struct watch));
+
+	watch->id = ++watch_head.id;
+	watch->channel = channel;
+	watch->condition = condition;
+	watch->func = func;
+	watch->user_data = user_data;
+
+	watch->next = watch_head.next;
+	watch_head.next = watch;
+
+	return watch->id;
+}
+
+GMainLoop *g_main_loop_new(GMainContext *context, gboolean is_running)
+{
+	GMainLoop *ml;
+
+	ml = malloc(sizeof(GMainLoop));
+	if (!ml)
+		return NULL;
+
+	ml->bail = 0;
+
+	return ml;
+}
+
+void g_main_loop_run(GMainLoop *loop)
+{
+	int open_max = sysconf(_SC_OPEN_MAX);
+	struct pollfd *ufds;
+
+	ufds = malloc(open_max * sizeof(struct pollfd));
+	if (!ufds)
+		return;
+
+	while (!loop->bail) {
+		int nfds, rc, i;
+		struct watch *p, *w;
+
+		nfds = 0;
+		for (w = watch_head.next; w != NULL; w = w->next) {
+			ufds[nfds].fd = w->channel->fd;
+			ufds[nfds].events = w->condition;
+			ufds[nfds].revents = 0;
+			nfds++;
+		}
+
+		rc = poll(ufds, nfds, -1);
+		if (rc < 0)
+			continue;
+
+		p = &watch_head;
+		w = watch_head.next;
+		i = 0;
+
+		while (w) {
+			if (ufds[i].revents) {
+				gboolean keep = w->func(w->channel, ufds[i].revents, w->user_data);
+				if (!keep) {
+					p->next = w->next;
+					memset(w, 0, sizeof(*w));
+					w = p->next;
+					i++;
+					continue;
+				}
+			}
+
+			p = w;
+			w = w->next;
+			i++;
+		}
+	}
+
+	free(ufds);
+}
+
+void g_main_loop_quit(GMainLoop *loop)
+{
+	loop->bail = 1;
+}
diff --git a/common/glib-ectomy.h b/common/glib-ectomy.h
new file mode 100644
index 00000000..c507e3c7
--- /dev/null
+++ b/common/glib-ectomy.h
@@ -0,0 +1,92 @@
+#ifndef __GLIB_ECTOMY_H
+#define __GLIB_ECTOMY_H
+
+#include <stdlib.h>
+#include <sys/poll.h>
+
+typedef char	gchar;
+typedef short	gshort;
+typedef long	glong;
+typedef int	gint;
+typedef gint	gboolean;
+
+typedef unsigned char	guchar;
+typedef unsigned short	gushort;
+typedef unsigned long	gulong;
+typedef unsigned int	guint;
+
+typedef float	gfloat;
+typedef double	gdouble;
+
+typedef void *		gpointer;
+typedef const void *	gconstpointer;
+
+typedef size_t	gsize;
+typedef ssize_t	gssize;
+
+#ifndef SSIZE_MAX
+#define SSIZE_MAX	INT_MAX
+#endif
+
+typedef struct _GIOChannel {
+	int fd;
+} GIOChannel;
+
+typedef struct _GMainContext {
+	int dummy;
+} GMainContext;
+
+typedef struct _GMainLoop {
+	int bail;
+} GMainLoop;
+
+typedef enum {
+	G_IO_ERROR_NONE,
+	G_IO_ERROR_AGAIN,
+	G_IO_ERROR_INVAL,
+	G_IO_ERROR_UNKNOWN
+} GIOError;
+
+typedef enum {
+	G_IO_STATUS_ERROR	= -1,
+	G_IO_STATUS_NORMAL	= 0,
+	G_IO_STATUS_EOF		= 1,
+	G_IO_STATUS_AGAIN	= 2
+} GIOStatus;
+
+#ifndef FALSE
+#define FALSE (0)
+#endif
+
+#ifndef TRUE
+#define TRUE (!FALSE)
+#endif
+
+typedef enum {
+	G_IO_IN		= POLLIN,
+	G_IO_OUT	= POLLOUT,
+	G_IO_PRI	= POLLPRI,
+	G_IO_ERR	= POLLERR,
+	G_IO_HUP	= POLLHUP,
+	G_IO_NVAL	= POLLNVAL
+} GIOCondition;
+
+typedef gboolean (*GIOFunc) (GIOChannel *source, GIOCondition condition, gpointer data);
+
+GIOError g_io_channel_read(GIOChannel *channel, gchar *buf, gsize count, gsize *bytes_read);
+void g_io_channel_close(GIOChannel *channel);
+
+GIOChannel *g_io_channel_unix_new(int fd);
+gint g_io_channel_unix_get_fd(GIOChannel *channel);
+guint g_io_add_watch(GIOChannel *channel, GIOCondition condition, GIOFunc func, gpointer user_data);
+void g_io_remove_watch(guint id);
+
+GMainLoop *g_main_loop_new(GMainContext *context, gboolean is_running);
+void g_main_loop_run(GMainLoop *loop);
+void g_main_loop_quit(GMainLoop *loop);
+
+#define g_main_new(is_running)	g_main_loop_new(NULL, is_running);
+#define g_main_run(loop)	g_main_loop_run(loop)
+#define g_main_quit(loop)	g_main_loop_quit(loop)
+
+#endif /* __GLIB_ECTOMY_H */