Info Panel: display more OS details

Rely on old utsname and os-release (http://0pointer.de/blog/projects/os-release) when available
to display more underlying OS details in the Info panel.
The idea is when someone creates a bug entry we can request them to copy/paste that screen
to give more info about the context that could help us debug the issue.
For example, on my current system it's displaying:
"Running on: Ubuntu 22.10 (x86_64)"

src/dialog.c

@@ -37,6 +37,7 @@
 #include <limits.h>
 #include <errno.h>
 #include <time.h>
+#include <sys/utsname.h>
 
 #ifdef HAVE_MALLOC_H
 #include <malloc.h>
@@ -1172,6 +1173,58 @@ static void destroyInfoPanel(WCoreWindow *foo, void *data, XEvent *event)
 	infoPanel = NULL;
 }
 
+char *getPrettyOSName(void)
+{
+	char line[200];
+	char *token;
+	char *posn = NULL;
+	const char s[2] = "=";
+	FILE *fp;
+
+	fp = fopen("/etc/os-release", "r");
+	if (!fp) {
+		fp = fopen("/usr/lib/os-release", "r");
+		if (!fp) {
+			wwarning(_("no os-release file on the system"));
+			return NULL;
+		}
+	}
+
+	while (fgets(line, sizeof(line), fp) != NULL) {
+		if (strncmp(line, "PRETTY_NAME", strlen("PRETTY_NAME")) == 0) {
+			line[strcspn(line, "\r\n")] = 0;
+			token = strtok(line, s);
+			if (token) {
+				//get straight to the second part of the line
+				token = strtok(NULL, s);
+				if (token) {
+					//removing potential quotes
+					char *dst = token;
+					char *src = token;
+					char c;
+
+					while ((c = *src++) != '\0') {
+						if (c == '\\') {
+							*dst++ = c;
+							if ((c = *src++) == '\0')
+								break;
+							*dst++ = c;
+						}
+						else if (c != '"' && c != '\'')
+							*dst++ = c;
+					}
+					*dst = '\0';
+					posn = malloc(strlen(token));
+					strncpy(posn, token, strlen(token));
+				}
+			}
+			break;
+		}
+	}
+	fclose(fp);
+	return posn;
+}
+
 void wShowInfoPanel(WScreen *scr)
 {
 	InfoPanel *panel;
@@ -1198,6 +1251,7 @@ void wShowInfoPanel(WScreen *scr)
 	int current_year = 2020;
 	time_t s;
 	struct tm *current_time;
+	struct utsname uts;
 
 	s = time(NULL);
 	if (s) {
@@ -1225,7 +1279,7 @@ void wShowInfoPanel(WScreen *scr)
 #else
 	pwidth = WMScaleX(382);
 #endif
-	pheight = WMScaleY(250);
+	pheight = WMScaleY(270);
 	WMResizeWidget(panel->win, pwidth, pheight);
 
 	logo = WMCreateApplicationIconBlendedPixmap(scr->wmscreen, (RColor *) NULL);
@@ -1289,7 +1343,7 @@ void wShowInfoPanel(WScreen *scr)
 
 	panel->copyrL = WMCreateLabel(panel->win);
 	WMResizeWidget(panel->copyrL, WMScaleX(360), WMScaleY(60));
-	WMMoveWidget(panel->copyrL, WMScaleX(15), WMScaleY(190));
+	WMMoveWidget(panel->copyrL, WMScaleX(15), WMScaleY(210));
 	WMSetLabelTextAlignment(panel->copyrL, WALeft);
 
 	snprintf(buffer, sizeof(buffer), COPYRIGHT_TEXT, current_year);
@@ -1302,9 +1356,19 @@ void wShowInfoPanel(WScreen *scr)
 	}
 
 	strbuf = NULL;
+	if (uname(&uts) != -1) {
+		char *posn = getPrettyOSName();
+		if (posn) {
+			snprintf(buffer, sizeof(buffer), _("Running on: %s (%s)\n"), posn, uts.machine);
+			free(posn);
+		}
+		else
+			snprintf(buffer, sizeof(buffer), _("Running on: %s (%s)\n"), uts.sysname, uts.machine);
+		strbuf = wstrappend(strbuf, buffer);
+	}
+
 	snprintf(buffer, sizeof(buffer), _("Using visual 0x%x: %s %ibpp "),
 		 (unsigned)scr->w_visual->visualid, visuals[scr->w_visual->class], scr->w_depth);
-
 	strbuf = wstrappend(strbuf, buffer);
 
 	switch (scr->w_depth) {
@@ -1329,9 +1393,9 @@ void wShowInfoPanel(WScreen *scr)
 		struct mallinfo2 ma = mallinfo2();
 		snprintf(buffer, sizeof(buffer),
 #ifdef DEBUG
-					_("Total memory allocated: %lu kB (in use: %lu kB, %lu free chunks).\n"),
+					_("Total memory allocated: %lu kB (in use: %lu kB, %lu free chunks)\n"),
 #else
-					_("Total memory allocated: %lu kB (in use: %lu kB).\n"),
+					_("Total memory allocated: %lu kB (in use: %lu kB)\n"),
 #endif
 					(ma.arena + ma.hblkhd) / 1024,
 					(ma.uordblks + ma.hblkhd) / 1024
@@ -1382,7 +1446,7 @@ void wShowInfoPanel(WScreen *scr)
 	strbuf = wstrappend(strbuf, _("Xinerama: "));
 	{
 		char tmp[128];
-		snprintf(tmp, sizeof(tmp) - 1, _("%d head(s) found."), scr->xine_info.count);
+		snprintf(tmp, sizeof(tmp) - 1, _("%d head(s) found"), scr->xine_info.count);
 		strbuf = wstrappend(strbuf, tmp);
 	}
 #endif
@@ -1394,14 +1458,13 @@ void wShowInfoPanel(WScreen *scr)
 		strbuf = wstrappend(strbuf, _("supported"));
 	else
 		strbuf = wstrappend(strbuf, _("unsupported"));
-	strbuf = wstrappend(strbuf, ".");
 #endif
 
 	panel->infoL = WMCreateLabel(panel->win);
 #if defined(HAVE_MALLOC_H) && defined(HAVE_MALLINFO2) && defined(DEBUG)
-	WMResizeWidget(panel->infoL, WMScaleX(380), WMScaleY(80));
+	WMResizeWidget(panel->infoL, WMScaleX(380), WMScaleY(100));
 #else
-	WMResizeWidget(panel->infoL, WMScaleX(350), WMScaleY(80));
+	WMResizeWidget(panel->infoL, WMScaleX(350), WMScaleY(100));
 #endif
 	WMMoveWidget(panel->infoL, WMScaleX(15), WMScaleY(115));
 	WMSetLabelText(panel->infoL, strbuf);