Author: dteske
Date: Thu May 16 16:46:02 2013
New Revision: 250701
URL: http://svnweb.freebsd.org/changeset/base/250701
Log:
Add a handy function for truncating variables to a specific byte-length. It
should be noted that newlines are both preserved and included in said byte-
count. If you want to truncate single-line values without regard to line
termination, there's always f_substr() which already exists herein.
Modified:
head/usr.sbin/bsdconfig/share/strings.subr
Modified: head/usr.sbin/bsdconfig/share/strings.subr
==============================================================================
--- head/usr.sbin/bsdconfig/share/strings.subr Thu May 16 16:20:17 2013
(r250700)
+++ head/usr.sbin/bsdconfig/share/strings.subr Thu May 16 16:46:02 2013
(r250701)
@@ -51,6 +51,26 @@ f_substr()
echo "$string" | awk "{ print substr(\$0, $start, $len) }"
}
+# f_snprintf $var_to_set $size $format ...
+#
+# Similar to snprintf(3), write at most $size number of bytes into $var_to_set
+# using printf(1) syntax (`$format ...'). The value of $var_to_set is NULL
+# unless at-least one byte is stored from the output.
+#
+f_snprintf()
+{
+ local __var_to_set="$1" __size="$2"
+ shift 2 # var_to_set/size
+ eval "$__var_to_set"=\$\( printf \"\$@\" \| awk -v max=\"\$__size\" \''
+ {
+ len = length($0)
+ max -= len
+ print substr($0,0,(max > 0 ? len : max + len))
+ if ( max < 0 ) exit
+ max--
+ }'\' \)
+}
+
# f_longest_line_length
#
# Simple wrapper to an awk(1) script to print the length of the longest line of
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