Improve .if/.ie condition handling.

* Support string comparisons.
* Support negation not only for numerical, but for all conditions.
* Switch the `o' condition from false to true.
* Handle the `c', `d', and `r' conditions as false for now.
* Use int for boolean data instead of rolling our own "enum roffrule";
needed such that we can use the standard ! and == operators.

Havard Eidnes reported via the NetBSD bug tracking system that some
Tcl*(3) manuals need this, and Thomas Klausner <wiz at NetBSD>
forwarded the report to me.  This doesn't make the crazy Tcl*(3)
macrology maze happy yet, but brings us a bit closer.

3 files changed, 57 insertions, 2 deletions

diff --git a/regress/usr.bin/mandoc/roff/cond/Makefile b/regress/usr.bin/mandoc/roff/cond/Makefile
index 6f4f653b392..11511142584 100644
--- a/regress/usr.bin/mandoc/roff/cond/Makefile
+++ b/regress/usr.bin/mandoc/roff/cond/Makefile
@@ -1,5 +1,5 @@
-# $OpenBSD: Makefile,v 1.4 2013/10/04 02:19:47 schwarze Exp $
+# $OpenBSD: Makefile,v 1.5 2014/03/08 04:43:39 schwarze Exp $
 
-REGRESS_TARGETS = if ie close numeric before-Dd
+REGRESS_TARGETS = if ie close numeric strcmp before-Dd
 
 .include <bsd.regress.mk>
diff --git a/regress/usr.bin/mandoc/roff/cond/strcmp.in b/regress/usr.bin/mandoc/roff/cond/strcmp.in
new file mode 100644
index 00000000000..eabe80ffe63
--- /dev/null
+++ b/regress/usr.bin/mandoc/roff/cond/strcmp.in
@@ -0,0 +1,37 @@
+.TH COND-STRCMP 1 "March 8, 2014" OpenBSD
+.SH NAME
+cond-strcmp \- roff conditions involving string comparison
+.SH DESCRIPTION
+empty:
+.ie """ (t)
+.el (f)
+one char:
+.ie xaxax (t)
+.el (f)
+three chars:
+.ie xabcxabcx (t)
+.el (f)
+.br
+mismatch:
+.ie xabcxabdx (t)
+.el (f)
+longer:
+.ie xabcxabcdx (t)
+.el (f)
+shorter:
+.ie xabcdxabcx (t)
+.el (f)
+.br
+no middle:
+.ie xabc (t)
+.el (f)
+no end:
+.ie xabcxabc
+.el (f)
+.SS Negation
+match:
+.ie !xabcxabcx (t)
+.el (f)
+mismatch:
+.ie !xaxbx (t)
+.el (f)
diff --git a/regress/usr.bin/mandoc/roff/cond/strcmp.out_ascii b/regress/usr.bin/mandoc/roff/cond/strcmp.out_ascii
new file mode 100644
index 00000000000..d96b51b527a
--- /dev/null
+++ b/regress/usr.bin/mandoc/roff/cond/strcmp.out_ascii
@@ -0,0 +1,18 @@
+COND-STRCMP(1)             OpenBSD Reference Manual             COND-STRCMP(1)
+
+
+
+NNAAMMEE
+       cond-strcmp - roff conditions involving string comparison
+
+DDEESSCCRRIIPPTTIIOONN
+       empty: (t) one char: (t) three chars: (t)
+       mismatch: (f) longer: (f) shorter: (f)
+       no middle: (f) no end: (f)
+
+   NNeeggaattiioonn
+       match: (f) mismatch: (t)
+
+
+
+OpenBSD                          March 8, 2014                  COND-STRCMP(1)