Detect if the input file cannot be opened

hangman.c

@@ -135,14 +135,13 @@ void initGuessWord(game_state *gs, char *filename) {
     int i;
     mvprintw(0, 1, "Please enter your word: ");
     if (strlen(gs->guessWord) == 0) { /* Word can be set by arguments */
-        if (strlen(filename) == 0) {
+        /* If a file argument was specified then try to read a random line from the file,
+           if this is not successful or if there is no file argument use the manual input. */
+        if (strlen(filename) == 0 || readRandomLine(filename, gs->guessWord) != 0) { // readRandomLine is only excecuted when strlen(filename) != 0
             /* Manual input */
             curs_set(1);
             getnstr(gs->guessWord, MAXWORDLENGTH - 1); /* Reads the guessWord with a limit */
             curs_set(0);
-        } else {
-            /* Random line from file */
-            readRandomLine(filename, gs->guessWord);
         }
     }
 
@@ -366,10 +365,16 @@ int centerDiff(int coordinate, char *str) {
     return coordinate - (len / 2); /* Integer division */
 }
 
-void readRandomLine(char *file, char *result) {
-    FILE *fp = fopen(file, "r");
+int readRandomLine(char *file, char *result) {
+    FILE *fp;
     int count = 0, wordlength = 0;
     char line[MAXWORDLENGTH];
+
+    fp = fopen(file, "r");
+    if (fp == NULL) {
+        return 1;
+    }
+
     srand(time(NULL));
     while (fgets(line, MAXWORDLENGTH, fp) != NULL) {
         count++;
@@ -381,6 +386,8 @@ void readRandomLine(char *file, char *result) {
     wordlength = strlen(result);
     result[wordlength - 1] = '\0';
     fclose(fp);
+
+    return 0;
 }
 
 void trollHitScreen(game_state *gs, hitfeed *hf, int hits) {

hangman.h

@@ -62,7 +62,7 @@ void showStartScreen(game_state *gs);
 void startGame(game_state *gs, hitfeed *hf);
 void showHelp(game_state *gs);
 int centerDiff(int coordinate, char *str);
-void readRandomLine(char *file, char *result);
+int readRandomLine(char *file, char *result);
 void trollHitScreen(game_state *gs, hitfeed *hf, int hits);
 void addHitToFeed(hitfeed *hf, char *streak, int hit);
 void trollHandleImpressive(hitfeed *hf, game_state *gs, int hits);