bsdgrep(1): Slooowly peel away the chunky onion

(or peel off the band-aid, whatever floats your boat)

This addresses two separate issues:

1.) Nothing within bsdgrep actually knew whether it cared about line numbers
  or not.

2.) The file layer knew nothing about the context in which it was being
  called.

#1 is only important when we're *not* processing line-by-line. #2 is
debatably a good idea; the parsing context is only handy because that's
where we store current offset information and, as of this commit, whether or
not it needs to be line-aware.

usr.bin/grep/file.c

@@ -95,7 +95,7 @@ grep_lnbufgrow(size_t newlen)
 }
 
 char *
-grep_fgetln(struct file *f, size_t *lenp)
+grep_fgetln(struct file *f, struct parsec *pc)
 {
 	unsigned char *p;
 	char *ret;
@@ -109,18 +109,18 @@ grep_fgetln(struct file *f, size_t *lenp)
 
 	if (bufrem == 0) {
 		/* Return zero length to indicate EOF */
-		*lenp = 0;
+		pc->ln.len= 0;
 		return (bufpos);
 	}
 
-	/* Look for a newline in the remaining part of the buffer */
+	/* Look for a newline in the remaining part of the [6rbuffer */
 	if ((p = memchr(bufpos, fileeol, bufrem)) != NULL) {
 		++p; /* advance over newline */
 		ret = bufpos;
 		len = p - bufpos;
 		bufrem -= len;
 		bufpos = p;
-		*lenp = len;
+		pc->ln.len = len;
 		return (ret);
 	}
 
@@ -155,11 +155,11 @@ grep_fgetln(struct file *f, size_t *lenp)
 		bufpos = p;
 		break;
 	}
-	*lenp = len;
+	pc->ln.len = len;
 	return (lnbuf);
 
 error:
-	*lenp = 0;
+	pc->ln.len = 0;
 	return (NULL);
 }
 

usr.bin/grep/grep.h

@@ -97,6 +97,21 @@ struct epat {
 	int		 mode;
 };
 
+/*
+ * Parsing context; used to hold things like matches made and
+ * other useful bits
+ */
+struct parsec {
+	regmatch_t	matches[MAX_MATCHES];		/* Matches made */
+	/* XXX TODO: This should be a chunk, not a line */
+	struct str	ln;				/* Current line */
+	size_t		lnstart;			/* Position in line */
+	size_t		matchidx;			/* Latest match index */
+	int		printed;			/* Metadata printed? */
+	bool		binary;				/* Binary file? */
+	bool		cntlines;			/* Count lines? */
+};
+
 /* Flags passed to regcomp() and regexec() */
 extern int	 cflags, eflags;
 
@@ -141,4 +156,4 @@ void	 clearqueue(void);
 /* file.c */
 void		 grep_close(struct file *f);
 struct file	*grep_open(const char *path);
-char		*grep_fgetln(struct file *f, size_t *len);
+char		*grep_fgetln(struct file *f, struct parsec *pc);

usr.bin/grep/util.c

@@ -56,20 +56,6 @@ __FBSDID("$FreeBSD$");
 
 static bool	 first_match = true;
 
-/*
- * Parsing context; used to hold things like matches made and
- * other useful bits
- */
-struct parsec {
-	regmatch_t	matches[MAX_MATCHES];		/* Matches made */
-	/* XXX TODO: This should be a chunk, not a line */
-	struct str	ln;				/* Current line */
-	size_t		lnstart;			/* Position in line */
-	size_t		matchidx;			/* Latest match index */
-	int		printed;			/* Metadata printed? */
-	bool		binary;				/* Binary file? */
-};
-
 /*
  * Match printing context
  */
@@ -276,7 +262,7 @@ procmatches(struct mprintc *mc, struct parsec *pc, bool matched)
 		if (mflag) {
 			/* XXX TODO: Decrement by number of matched lines */
 			mcount -= 1;
-			if (mflag && mcount <= 0)
+			if (mcount <= 0)
 				return (false);
 		}
 	} else if (mc->doctx)
@@ -327,6 +313,7 @@ procfile(const char *fn)
 	pc.ln.boff = 0;
 	pc.ln.off = -1;
 	pc.binary = f->binary;
+	pc.cntlines = false;
 	memset(&mc, 0, sizeof(mc));
 	mc.printmatch = true;
 	if ((pc.binary && binbehave == BINFILE_BIN) || cflag || qflag ||
@@ -334,6 +321,8 @@ procfile(const char *fn)
 		mc.printmatch = false;
 	if (mc.printmatch && (Aflag != 0 || Bflag != 0))
 		mc.doctx = true;
+	if (mc.printmatch && (Aflag != 0 || Bflag != 0 || mflag || nflag))
+		pc.cntlines = true;
 	mcount = mlimit;
 
 	for (lines = 0; lines == 0 || !(lflag || qflag); ) {
@@ -349,7 +338,7 @@ procfile(const char *fn)
 		pc.ln.boff = 0;
 		pc.ln.off += pc.ln.len + 1;
 		/* XXX TODO: Grab a chunk */
-		if ((pc.ln.dat = grep_fgetln(f, &pc.ln.len)) == NULL ||
+		if ((pc.ln.dat = grep_fgetln(f, &pc)) == NULL ||
 		    pc.ln.len == 0)
 			break;