Handle malloc failures from read_line

common/readline.c

@@ -1,4 +1,5 @@
 #include "readline.h"
+#include "log.h"
 #include <stdlib.h>
 #include <stdio.h>
 
@@ -7,6 +8,7 @@ char *read_line(FILE *file) {
 	char *string = malloc(size);
 	char lastChar = '\0';
 	if (!string) {
+		sway_log(L_ERROR, "Unable to allocate memory for read_line");
 		return NULL;
 	}
 	while (1) {
@@ -27,6 +29,7 @@ char *read_line(FILE *file) {
 			char *new_string = realloc(string, size *= 2);
 			if (!new_string) {
 				free(string);
+				sway_log(L_ERROR, "Unable to allocate memory for read_line");
 				return NULL;
 			}
 			string = new_string;

sway/config.c

@@ -575,6 +575,9 @@ bool read_config(FILE *file, struct sway_config *config) {
 	char *line;
 	while (!feof(file)) {
 		line = read_line(file);
+		if (!line) {
+			continue;
+		}
 		line_number++;
 		line = strip_whitespace(line);
 		if (line[0] == '#') {

sway/main.c

@@ -53,7 +53,10 @@ void detect_proprietary() {
 		return;
 	}
 	while (!feof(f)) {
-		char *line = read_line(f);
+		char *line;
+		if (!(line = read_line(f))) {
+			break;
+		}
 		if (strstr(line, "nvidia")) {
 			fprintf(stderr, "\x1B[1;31mWarning: Proprietary nvidia drivers do NOT support Wayland. Use nouveau.\x1B[0m\n");
 			fprintf(stderr, "\x1B[1;31mYes, they STILL don't work with the newly announced wayland \"support\".\x1B[0m\n");
@@ -118,7 +121,10 @@ static void log_distro() {
 		if (f) {
 			sway_log(L_INFO, "Contents of %s:", paths[i]);
 			while (!feof(f)) {
-				char *line = read_line(f);
+				char *line;
+				if (!(line = read_line(f))) {
+					break;
+				}
 				if (*line) {
 					sway_log(L_INFO, "%s", line);
 				}
@@ -136,7 +142,10 @@ static void log_kernel() {
 		return;
 	}
 	while (!feof(f)) {
-		char *line = read_line(f);
+		char *line;
+		if (!(line = read_line(f))) {
+			break;
+		}
 		if (*line) {
 			sway_log(L_INFO, "%s", line);
 		}