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	tSend message size inside messages through pipes - surf - customized build of s…
	git clone git://src.adamsgaard.dk/surf
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	---
	commit 02541c314678aa1ee6eb485ca9dce66a46693aac
	parent 2b71a22755bae132a639fe10475a0d42e582d244
	Author: Quentin Rameau <[email protected]>
	Date: Tue, 9 Oct 2018 12:27:59 +0200

	Send message size inside messages through pipes

	Diffstat:
	M common.h \| 2 +-
	M libsurf-webext.c \| 37 ++++++++++++++++++-----------…
	M surf.c \| 26 +++++++++++++++++---------

	3 files changed, 39 insertions(+), 26 deletions(-)
	---
	diff --git a/common.h b/common.h
	t@@ -1,3 +1,3 @@
	-#define MSGBUFSZ 32
	+#define MSGBUFSZ 8

	void die(char *, ...);
	diff --git a/libsurf-webext.c b/libsurf-webext.c
	t@@ -41,59 +41,64 @@ newpage(WebKitWebPage *page)
	static void
	msgsurf(Page p, const char s)
	{
	- char msg[MSGBUFSZ];
	+ static char msg[MSGBUFSZ];
	+ size_t sln = strlen(s);
	int ret;

	- msg[0] = p ? p->id : 0;
	- ret = snprintf(&msg[1], sizeof(msg) - 1, "%s", s);
	- if (ret >= sizeof(msg)) {
	+ if ((ret = snprintf(msg, sizeof(msg), "%c%c%s",
	+ 2 + sln, p ? p->id : 0, s))
	+ >= sizeof(msg)) {
	fprintf(stderr, "webext: message too long: %d\n", ret);
	return;
	}

	- if (pipeout) {
	- if (write(pipeout, msg, sizeof(msg)) < 0)
	- fprintf(stderr, "webext: error sending: %s\n", msg);
	- }
	+ if (pipeout && write(pipeout, msg, sizeof(msg)) < 0)
	+ fprintf(stderr, "webext: error sending: %.*s\n", ret-2, msg+2);
	}

	static gboolean
	readpipe(GIOChannel *s, GIOCondition c, gpointer unused)
	{
	- char msg[MSGBUFSZ];
	- gsize msgsz;
	+ static char msg[MSGBUFSZ], msgsz;
	WebKitDOMDOMWindow *view;
	GError *gerr = NULL;
	glong wh, ww;
	Page *p;

	- if (g_io_channel_read_chars(s, msg, LENGTH(msg), &msgsz, &gerr) !=
	+ if (g_io_channel_read_chars(s, msg, LENGTH(msg), NULL, &gerr) !=
	G_IO_STATUS_NORMAL) {
	fprintf(stderr, "webext: error reading pipe: %s\n",
	gerr->message);
	g_error_free(gerr);
	return TRUE;
	}
	- msg[msgsz] = '\0';
	+ if ((msgsz = msg[0]) < 3) {
	+ fprintf(stderr, "webext: message too short: %d\n", msgsz);
	+ return TRUE;
	+ }

	for (p = pages; p; p = p->next) {
	- if (p->id == msg[0])
	+ if (p->id == msg[1])
	break;
	}
	if (!p \|\| !(view = webkit_dom_document_get_default_view(
	webkit_web_page_get_dom_document(p->webpage))))
	return TRUE;

	- switch (msg[1]) {
	+ switch (msg[2]) {
	case 'h':
	+ if (msgsz != 4)
	+ return TRUE;
	ww = webkit_dom_dom_window_get_inner_width(view);
	webkit_dom_dom_window_scroll_by(view,
	- (ww / 100) * msg[2], 0);
	+ (ww / 100) * msg[3], 0);
	break;
	case 'v':
	+ if (msgsz != 4)
	+ return TRUE;
	wh = webkit_dom_dom_window_get_inner_height(view);
	webkit_dom_dom_window_scroll_by(view,
	- 0, (wh / 100) * msg[2]);
	+ 0, (wh / 100) * msg[3]);
	break;
	}

	diff --git a/surf.c b/surf.c
	t@@ -1209,20 +1209,22 @@ newview(Client c, WebKitWebView rv)
	static gboolean
	readpipe(GIOChannel *s, GIOCondition ioc, gpointer unused)
	{
	- char msg[MSGBUFSZ];
	- gsize msgsz;
	+ static char msg[MSGBUFSZ], msgsz;
	GError *gerr = NULL;

	- if (g_io_channel_read_chars(s, msg, sizeof(msg), &msgsz, &gerr) !=
	+ if (g_io_channel_read_chars(s, msg, sizeof(msg), NULL, &gerr) !=
	G_IO_STATUS_NORMAL) {
	fprintf(stderr, "surf: error reading pipe: %s\n",
	gerr->message);
	g_error_free(gerr);
	return TRUE;
	}
	- msg[msgsz] = '\0';
	+ if ((msgsz = msg[0]) < 3) {
	+ fprintf(stderr, "surf: message too short: %d\n", msgsz);
	+ return TRUE;
	+ }

	- switch (msg[1]) {
	+ switch (msg[2]) {
	case 'i':
	close(pipein[1]);
	close(pipeout[0]);
	t@@ -1843,12 +1845,18 @@ zoom(Client c, const Arg a)
	static void
	msgext(Client c, char type, const Arg a)
	{
	- char msg[MSGBUFSZ] = { c->pageid, type, a->i, '\0' };
	+ static char msg[MSGBUFSZ];
	+ int ret;

	- if (pipeout[1]) {
	- if (write(pipeout[1], msg, sizeof(msg)) < 0)
	- fprintf(stderr, "surf: error sending: %s\n", msg);
	+ if ((ret = snprintf(msg, sizeof(msg), "%c%c%c%c",
	+ 4, c->pageid, type, a->i))
	+ >= sizeof(msg)) {
	+ fprintf(stderr, "surf: message too long: %d\n", ret);
	+ return;
	}
	+
	+ if (pipeout[1] && write(pipeout[1], msg, sizeof(msg)) < 0)
	+ fprintf(stderr, "surf: error sending: %.*s\n", ret-2, msg+2);
	}

	void