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[Qemu-devel] [PULL 2/5] rules.mak: New string testing functions


From: Paolo Bonzini
Subject: [Qemu-devel] [PULL 2/5] rules.mak: New string testing functions
Date: Thu, 17 Oct 2013 17:35:30 +0200

From: Peter Maydell <address@hidden>

Add new string testing functions which return a y/n result:
 eq : are two strings equal (ignoring leading/trailing space)?
 ne : are two strings unequal?
 isempty : is a string empty?
 notempty : is a string non-empty?

Based on an idea by Ákos Kovács <address@hidden>.

Signed-off-by: Peter Maydell <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
 rules.mak | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/rules.mak b/rules.mak
index 65a1b96..49edb9b 100644
--- a/rules.mak
+++ b/rules.mak
@@ -106,6 +106,17 @@ leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
 # Logical if: like make's $(if) but with an leqv-like test
 lif = $(if $(subst n,,$1),$2,$3)
 
+# String testing functions: inputs to these can be any string;
+# the output is always either "y" or "n". Leading and trailing whitespace
+# is ignored when comparing strings.
+# String equality
+eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
+# String inequality
+ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
+# Emptiness/non-emptiness tests:
+isempty = $(if $1,n,y)
+notempty = $(if $1,y,n)
+
 # Generate files with tracetool
 TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
 
-- 
1.8.3.1





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