Add file names and line numbers to calendar format error messages

Without file name and line number it is very cumbersum to identify the
locations of errors in calendar files.

MFC after:	3 days

usr.bin/calendar/io.c

@@ -75,6 +75,10 @@ static const char *calendarHomes[] = {".calendar", _PATH_INCLUDE_LOCAL, _PATH_IN
 static const char *calendarNoMail = "nomail";/* don't sent mail if file exist */
 
 static char path[MAXPATHLEN];
+static const char *cal_home;
+static const char *cal_dir;
+static const char *cal_file;
+static int cal_line;
 
 struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
 struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
@@ -118,7 +122,7 @@ cal_fopen(const char *file)
 	}
 
 	if (chdir(home) != 0) {
-		warnx("Cannot enter home directory");
+		warnx("Cannot enter home directory \"%s\"", home);
 		return (NULL);
 	}
 
@@ -126,8 +130,12 @@ cal_fopen(const char *file)
 		if (chdir(calendarHomes[i]) != 0)
 			continue;
 
-		if ((fp = fopen(file, "r")) != NULL)
+		if ((fp = fopen(file, "r")) != NULL) {
+			cal_home = home;
+			cal_dir = calendarHomes[i];
+			cal_file = file;
 			return (fp);
+		}
 	}
 
 	warnx("can't open calendar file \"%s\"", file);
@@ -139,10 +147,19 @@ cal_fopen(const char *file)
 	return (NULL);
 }
 
+#define	WARN0(format)		   \
+	warnx(format " in %s/%s/%s line %d", cal_home, cal_dir, cal_file, cal_line)
+#define	WARN1(format, arg1)		   \
+	warnx(format " in %s/%s/%s line %d", arg1, cal_home, cal_dir, cal_file, cal_line)
+
 static int
 token(char *line, FILE *out, int *skip)
 {
 	char *walk, c, a;
+	const char *this_cal_home;
+	const char *this_cal_dir;
+	const char *this_cal_file;
+	int this_cal_line;
 
 	if (strncmp(line, "endif", 5) == 0) {
 		if (*skip > 0)
@@ -155,7 +172,7 @@ token(char *line, FILE *out, int *skip)
 		trimlr(&walk);
 
 		if (*walk == '\0') {
-			warnx("Expecting arguments after #ifdef");
+			WARN0("Expecting arguments after #ifdef");
 			return (T_ERR);
 		}
 
@@ -170,7 +187,7 @@ token(char *line, FILE *out, int *skip)
 		trimlr(&walk);
 
 		if (*walk == '\0') {
-			warnx("Expecting arguments after #ifndef");
+			WARN0("Expecting arguments after #ifndef");
 			return (T_ERR);
 		}
 
@@ -185,7 +202,7 @@ token(char *line, FILE *out, int *skip)
 		trimlr(&walk);
 
 		if (*walk != '\0') {
-			warnx("Expecting no arguments after #else");
+			WARN0("Expecting no arguments after #else");
 			return (T_ERR);
 		}
 
@@ -206,12 +223,12 @@ token(char *line, FILE *out, int *skip)
 		trimlr(&walk);
 
 		if (*walk == '\0') {
-			warnx("Expecting arguments after #include");
+			WARN0("Expecting arguments after #include");
 			return (T_ERR);
 		}
 
 		if (*walk != '<' && *walk != '\"') {
-			warnx("Excecting '<' or '\"' after #include");
+			WARN0("Excecting '<' or '\"' after #include");
 			return (T_ERR);
 		}
 
@@ -220,13 +237,21 @@ token(char *line, FILE *out, int *skip)
 		c = walk[strlen(walk) - 1];
 
 		if (a != c) {
-			warnx("Unterminated include expecting '%c'", a);
+			WARN1("Unterminated include expecting '%c'", a);
 			return (T_ERR);
 		}
 		walk[strlen(walk) - 1] = '\0';
 
+		this_cal_home = cal_home;
+		this_cal_dir = cal_dir;
+		this_cal_file = cal_file;
+		this_cal_line = cal_line;
 		if (cal_parse(cal_fopen(walk), out))
 			return (T_ERR);
+		cal_home = this_cal_home;
+		cal_dir = this_cal_dir;
+		cal_file = this_cal_file;
+		cal_line = this_cal_line;
 
 		return (T_OK);
 	}
@@ -238,7 +263,7 @@ token(char *line, FILE *out, int *skip)
 		trimlr(&walk);
 
 		if (*walk == '\0') {
-			warnx("Expecting arguments after #define");
+			WARN0("Expecting arguments after #define");
 			return (T_ERR);
 		}
 
@@ -290,7 +315,9 @@ cal_parse(FILE *in, FILE *out)
 	if (in == NULL)
 		return (1);
 
+	cal_line = 0;
 	while ((linelen = getline(&line, &linecap, in)) > 0) {
+		cal_line++;
 		buf = line;
 		if (buf[linelen - 1] == '\n')
 			buf[--linelen] = '\0';

usr.bin/calendar/parsedata.c

@@ -312,10 +312,7 @@ determinestyle(char *date, int *flags,
 
 }
 
-void
-remember(int *rememberindex, int *y, int *m, int *d, char **ed, int yy, int mm,
-    int dd, char *extra);
-void
+static void
 remember(int *rememberindex, int *y, int *m, int *d, char **ed, int yy, int mm,
     int dd, char *extra)
 {