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build: image: use printf for ModelNameLimit16

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Fix syntax error on macos, for substr is undefined results according to
the POSIX standard.

From expr on macos:
 According to the POSIX standard, the use of string arguments length,
 substr, index, or match produces undefined results.  In this version of
 expr, these arguments are treated just as their respective string values.

By a simple test Makefile:

define ModelNameLimit16
$(shell expr substr "$(word 2, $(subst _, ,$(1)))" 1 16)
endef

define ModelNameLimit16_2
$(shell printf %.16s "$(word 2, $(subst _, ,$(1)))")
endef

hello:
	echo $(call ModelNameLimit16, technicolor_tg582n-telecom-italia)
	echo $(call ModelNameLimit16_2, technicolor_tg582n-telecom-italia)

The same output is produced.

echo tg582n-telecom-i
tg582n-telecom-i
echo tg582n-telecom-i
tg582n-telecom-i

Signed-off-by: Huangbin Zhan <zhanhb88@gmail.com>
[ wrap commit description to 80 columns and improve it ]
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
This commit is contained in:
Huangbin Zhan 2022-03-30 00:15:29 +08:00 committed by Christian Marangi
parent 88803cb0e6
commit 2f8ac8bcea
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1 changed files with 1 additions and 1 deletions
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2
include/image-commands.mk
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@ -4,7 +4,7 @@ IMAGE_KERNEL = $(word 1,$^)
IMAGE_ROOTFS = $(word 2,$^)
define ModelNameLimit16
$(shell expr substr "$(word 2, $(subst _, ,$(1)))" 1 16)
$(shell printf %.16s "$(word 2, $(subst _, ,$(1)))")
endef
define rootfs_align