327 lines
9.0 KiB
Plaintext
327 lines
9.0 KiB
Plaintext
if [ ! "$_STRINGS_SUBR" ]; then _STRINGS_SUBR=1
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#
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# Copyright (c) 2006-2013 Devin Teske
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# All Rights Reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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############################################################ GLOBALS
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#
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# Valid characters that can appear in an sh(1) variable name
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#
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# Please note that the character ranges A-Z and a-z should be avoided because
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# these can include accent characters (which are not valid in a variable name).
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# For example, A-Z matches any character that sorts after A but before Z,
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# including A and Z. Although ASCII order would make more sense, that is not
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# how it works.
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#
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VALID_VARNAME_CHARS="0-9ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_"
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############################################################ FUNCTIONS
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# f_substr "$string" $start [ $length ]
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#
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# Simple wrapper to awk(1)'s `substr' function.
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#
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f_substr()
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{
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local string="$1" start="${2:-0}" len="${3:-0}"
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echo "$string" | awk "{ print substr(\$0, $start, $len) }"
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}
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# f_snprintf $var_to_set $size $format ...
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#
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# Similar to snprintf(3), write at most $size number of bytes into $var_to_set
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# using printf(1) syntax (`$format ...'). The value of $var_to_set is NULL
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# unless at-least one byte is stored from the output.
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#
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f_snprintf()
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{
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local __var_to_set="$1" __size="$2"
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shift 2 # var_to_set/size
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eval "$__var_to_set"=\$\( printf \"\$@\" \| awk -v max=\"\$__size\" \''
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{
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len = length($0)
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max -= len
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print substr($0,0,(max > 0 ? len : max + len))
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if ( max < 0 ) exit
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max--
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}'\' \)
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}
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# f_vsnprintf $var_to_set $size $format $format_args
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#
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# Similar to vsnprintf(3), write at most $size number of bytes into $var_to_set
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# using printf(1) syntax (`$format $format_args'). The value of $var_to_set is
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# NULL unless at-least one byte is stored from the output.
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#
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# Example 1:
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#
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# limit=7 format="%s"
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# format_args="'abc 123'" # 3-spaces between abc and 123
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# f_vsnprintf foo $limit "$format" "$format_args" # foo=[abc 1]
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#
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# Example 2:
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#
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# limit=12 format="%s %s"
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# format_args=" 'doghouse' 'foxhound' "
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# # even more spaces added to illustrate escape-method
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# f_vsnprintf foo $limit "$format" "$format_args" # foo=[doghouse fox]
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#
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# Example 3:
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#
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# limit=13 format="%s %s"
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# f_shell_escape arg1 'aaa"aaa' # arg1=[aaa"aaa] (no change)
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# f_shell_escape arg2 "aaa'aaa" # arg2=[aaa'\''aaa] (escaped s-quote)
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# format_args="'$arg1' '$arg2'" # use single-quotes to surround args
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# f_vsnprintf foo $limit "$format" "$format_args" # foo=[aaa"aaa aaa'a]
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#
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# In all of the above examples, the call to f_vsnprintf() does not change. Only
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# the contents of $limit, $format, and $format_args changes in each example.
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#
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f_vsnprintf()
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{
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eval f_snprintf \"\$1\" \"\$2\" \"\$3\" $4
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}
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# f_longest_line_length
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#
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# Simple wrapper to an awk(1) script to print the length of the longest line of
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# input (read from stdin). Supports the newline escape-sequence `\n' for
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# splitting a single line into multiple lines.
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#
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f_longest_line_length_awk='
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BEGIN { longest = 0 }
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{
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if (split($0, lines, /\\n/) > 1)
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{
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for (n in lines)
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{
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len = length(lines[n])
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longest = ( len > longest ? len : longest )
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}
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}
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else
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{
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len = length($0)
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longest = ( len > longest ? len : longest )
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}
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}
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END { print longest }
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'
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f_longest_line_length()
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{
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awk "$f_longest_line_length_awk"
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}
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# f_number_of_lines
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#
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# Simple wrapper to an awk(1) script to print the number of lines read from
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# stdin. Supports newline escape-sequence `\n' for splitting a single line into
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# multiple lines.
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#
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f_number_of_lines_awk='
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BEGIN { num_lines = 0 }
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{
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num_lines += split(" "$0, unused, /\\n/)
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}
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END { print num_lines }
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'
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f_number_of_lines()
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{
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awk "$f_number_of_lines_awk"
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}
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# f_isinteger $arg
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#
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# Returns true if argument is a positive/negative whole integer.
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#
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f_isinteger()
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{
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local arg="$1"
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# Prevent division-by-zero
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[ "$arg" = "0" ] && return $SUCCESS
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# Attempt to perform arithmetic divison (an operation which will exit
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# with error unless arg is a valid positive/negative whole integer).
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#
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( : $((0/$arg)) ) > /dev/null 2>&1
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}
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# f_uriencode [$text]
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#
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# Encode $text for the purpose of embedding safely into a URL. Non-alphanumeric
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# characters are converted to `%XX' sequence where XX represents the hexa-
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# decimal ordinal of the non-alphanumeric character. If $text is missing, data
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# is instead read from standard input.
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#
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f_uriencode_awk='
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BEGIN {
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output = ""
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for (n = 0; n < 256; n++) pack[sprintf("%c", n)] = sprintf("%%%02x", n)
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}
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{
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sline = ""
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slen = length($0)
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for (n = 1; n <= slen; n++) {
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char = substr($0, n, 1)
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if ( char !~ /^[[:alnum:]_]$/ ) char = pack[char]
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sline = sline char
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}
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output = output ( output ? "%0a" : "" ) sline
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}
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END { print output }
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'
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f_uriencode()
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{
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if [ $# -gt 0 ]; then
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echo "$1" | awk "$f_uriencode_awk"
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else
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awk "$f_uriencode_awk"
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fi
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}
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# f_uridecode [$text]
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#
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# Decode $text from a URI. Encoded characters are converted from their `%XX'
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# sequence into original unencoded ASCII sequences. If $text is missing, data
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# is instead read from standard input.
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#
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f_uridecode_awk='
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BEGIN { for (n = 0; n < 256; n++) chr[n] = sprintf("%c", n) }
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{
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sline = ""
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slen = length($0)
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for (n = 1; n <= slen; n++)
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{
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seq = substr($0, n, 3)
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if ( seq ~ /^%[[:xdigit:]][[:xdigit:]]$/ ) {
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hex = substr(seq, 2, 2)
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sline = sline chr[sprintf("%u", "0x"hex)]
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n += 2
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} else
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sline = sline substr(seq, 1, 1)
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}
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print sline
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}
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'
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f_uridecode()
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{
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if [ $# -gt 0 ]; then
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echo "$1" | awk "$f_uridecode_awk"
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else
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awk "$f_uridecode_awk"
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fi
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}
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# f_replaceall $string $find $replace [$var_to_set]
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#
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# Replace all occurrences of $find in $string with $replace. If $var_to_set is
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# either missing or NULL, the variable name is produced on standard out for
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# capturing in a sub-shell (which is less recommended due to performance
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# degradation).
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#
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f_replaceall()
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{
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local __left="" __right="$1"
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local __find="$2" __replace="$3" __var_to_set="$4"
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while :; do
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case "$__right" in *$__find*)
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__left="$__left${__right%%$__find*}$__replace"
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__right="${__right#*$__find}"
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continue
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esac
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break
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done
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__left="$__left${__right#*$__find}"
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if [ "$__var_to_set" ]; then
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setvar "$__var_to_set" "$__left"
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else
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echo "$__left"
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fi
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}
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# f_str2varname $string [$var_to_set]
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#
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# Convert a string into a suitable value to be used as a variable name
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# by converting unsuitable characters into the underscrore [_]. If $var_to_set
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# is either missing or NULL, the variable name is produced on standard out for
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# capturing in a sub-shell (which is less recommended due to performance
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# degradation).
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#
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f_str2varname()
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{
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local __string="$1" __var_to_set="$2"
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f_replaceall "$__string" "[!$VALID_VARNAME_CHARS]" "_" "$__var_to_set"
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}
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# f_shell_escape $string [$var_to_set]
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#
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# Escape $string for shell eval statement(s) by replacing all single-quotes
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# with a special sequence that creates a compound string when interpolated
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# by eval with surrounding single-quotes.
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#
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# For example:
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#
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# foo="abc'123"
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# f_shell_escape "$foo" bar # bar=[abc'\''123]
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# eval echo \'$bar\' # produces abc'123
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#
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# This is helpful when processing an argument list that has to retain its
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# escaped structure for later evaluations.
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#
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# WARNING: Surrounding single-quotes are not added; this is the responsibility
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# of the code passing the escaped values to eval (which also aids readability).
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#
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f_shell_escape()
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{
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local __string="$1" __var_to_set="$2"
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f_replaceall "$__string" "'" "'\\''" "$__var_to_set"
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}
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# f_shell_unescape $string [$var_to_set]
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#
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# The antithesis of f_shell_escape(), this function takes an escaped $string
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# and expands it.
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#
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# For example:
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#
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# foo="abc'123"
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# f_shell_escape "$foo" bar # bar=[abc'\''123]
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# f_shell_unescape "$bar" # produces abc'123
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#
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f_shell_unescape()
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{
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local __string="$1" __var_to_set="$2"
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f_replaceall "$__string" "'\\''" "'" "$__var_to_set"
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}
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############################################################ MAIN
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f_dprintf "%s: Successfully loaded." strings.subr
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fi # ! $_STRINGS_SUBR
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