tweaks: condense a handful of comments, and drop an assert

src/files.c

@@ -1900,13 +1900,12 @@ bool write_file(const char *name, FILE *f_open, bool tmp,
 	while (fileptr != NULL) {
 		size_t data_len = strlen(fileptr->data), size;
 
-		/* Convert newlines to nulls, just before we write to disk. */
+		/* Decode LFs as the NULs that they are, before writing to disk. */
 		sunder(fileptr->data);
 
 		size = fwrite(fileptr->data, sizeof(char), data_len, f);
 
-		/* Convert nulls to newlines.  data_len is the string's real
-		 * length. */
+		/* Re-encode any embedded NULs as LFs. */
 		unsunder(fileptr->data, data_len);
 
 		if (size < data_len) {

src/global.c

@@ -125,8 +125,7 @@ openfilestruct *firstfile = NULL;
 
 #ifndef NANO_TINY
 char *matchbrackets = NULL;
-		/* The opening and closing brackets that can be found by bracket
-		 * searches. */
+		/* The opening and closing brackets that bracket searches can find. */
 char *whitespace = NULL;
 		/* The characters used when visibly showing tabs and spaces. */
 int whitespace_len[2];
@@ -464,8 +463,6 @@ void assign_keyinfo(sc *s, const char *keystring, const int keycode)
 	s->keystr = keystring;
 	s->meta = (keystring[0] == 'M' && keycode == 0);
 
-	assert(strlen(keystring) > 1 && (!s->meta || strlen(keystring) > 2));
-
 	if (keycode)
 		s->keycode = keycode;
 	else

src/prompt.c

@@ -446,8 +446,7 @@ functionptrtype acquire_an_answer(int *actual, bool allow_tabs,
 	char *history = NULL;
 		/* The current history string. */
 	char *magichistory = NULL;
-		/* The temporary string typed at the bottom of the history, if
-		 * any. */
+		/* The (partial) answer that was typed at the prompt, if any. */
 #ifdef ENABLE_TABCOMP
 	int last_kbinput = ERR;
 		/* The key we pressed before the current key. */
@@ -534,9 +533,8 @@ functionptrtype acquire_an_answer(int *actual, bool allow_tabs,
 					typing_x = strlen(answer);
 				}
 
-				/* If, after scrolling down, we're at the bottom of the
-				 * history list, answer is blank, and magichistory is set,
-				 * save magichistory in answer. */
+				/* If we've reached the bottom of the history list, and answer
+				 * is blank, and magichistory is set, restore the old answer. */
 				if ((*history_list)->next == NULL &&
 						*answer == '\0' && magichistory != NULL) {
 					answer = mallocstrcpy(answer, magichistory);

src/rcfile.c

@@ -926,8 +926,7 @@ void parse_rcfile(FILE *rcstream, bool syntax_only)
 		while (isblank((unsigned char)*ptr))
 			ptr++;
 
-		/* If we have a blank line or a comment, skip to the next
-		 * line. */
+		/* If the line is empty or a comment, skip to next line. */
 		if (*ptr == '\0' || *ptr == '#')
 			continue;