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Editing: strings.subr
if [ ! "$_STRINGS_SUBR" ]; then _STRINGS_SUBR=1 # # Copyright (c) 2006-2016 Devin Teske # All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # 1. Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # 2. Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in the # documentation and/or other materials provided with the distribution. # # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE # ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF # SUCH DAMAGE. # # $FreeBSD$ # ############################################################ INCLUDES BSDCFG_SHARE="/usr/share/bsdconfig" . $BSDCFG_SHARE/common.subr || exit 1 ############################################################ GLOBALS # # A Literal newline (for use with f_replace_all(), or IFS, or whatever) # NL=" " # END-QUOTE # # Valid characters that can appear in an sh(1) variable name # # Please note that the character ranges A-Z and a-z should be avoided because # these can include accent characters (which are not valid in a variable name). # For example, A-Z matches any character that sorts after A but before Z, # including A and Z. Although ASCII order would make more sense, that is not # how it works. # VALID_VARNAME_CHARS="0-9ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_" ############################################################ FUNCTIONS # f_isinteger $arg # # Returns true if argument is a positive/negative whole integer. # f_isinteger() { local arg="${1#-}" [ "${arg:-x}" = "${arg%[!0-9]*}" ] } # f_substr [-v $var_to_set] $string $start [$length] # # Similar to awk(1)'s substr(), return length substring of string that begins # at start position counted from 1. # case "$BASH_VERSION" in *?*) f_substr() { local __var_to_set= case "$1" in -v) __var_to_set="$2"; shift 2 ;; -v?*) __var_to_set="${2#-v}"; shift 1 ;; esac local __tmp="$1" __start="${2:-1}" __len="$3" [ "$__start" -gt 0 ] 2> /dev/null && __start=$(( $__start - 1 )) if [ ! "$__var_to_set" ]; then eval echo \"\${__tmp:\$__start${__len:+:\$__len}}\" return $? fi if [ "$__len" ]; then eval $__var_to_set=\"\${__tmp:\$__start:\$__len}\" else eval $__var_to_set=\"\${__tmp:\$__start}\" fi } ;; *) # NB: On FreeBSD, sh(1) runs this faster than bash(1) runs the above f_substr() { local OPTIND=1 OPTARG __flag __var_to_set= while getopts v: __flag; do case "$__flag" in v) __var_to_set="$OPTARG" ;; esac done shift $(( $OPTIND - 1 )) local __tmp="$1" __start="${2:-1}" __size="$3" local __tbuf __tbuf_len __trim __trimq if [ ! "$__tmp" ]; then [ "$__var_to_set" ] && setvar "$__var_to_set" "" return ${SUCCESS:-0} fi [ "$__start" -ge 1 ] 2> /dev/null || __start=1 if ! [ "${__size:-1}" -ge 1 ] 2> /dev/null; then [ "$__var_to_set" ] && setvar "$__var_to_set" "" return ${FAILURE:-1} fi __trim=$(( $__start - 1 )) while [ $__trim -gt 0 ]; do __tbuf="?" __tbuf_len=1 while [ $__tbuf_len -lt $(( $__trim / $__tbuf_len )) ] do __tbuf="$__tbuf?" __tbuf_len=$(( $__tbuf_len + 1 )) done __trimq=$(( $__trim / $__tbuf_len )) __trim=$(( $__trim - $__tbuf_len * $__trimq )) while [ $__trimq -gt 0 ]; do __tmp="${__tmp#$__tbuf}" __trimq=$(( $__trimq - 1 )) done done local __tmp_size=${#__tmp} local __mask __mask_len __trim=$(( $__tmp_size - ${__size:-$__tmp_size} )) while [ $__trim -gt 0 ]; do __tbuf="?" __tbuf_len=1 if [ $__trim -le $__size ]; then while [ $__tbuf_len -lt $(( $__trim / $__tbuf_len )) ]; do __tbuf="$__tbuf?" __tbuf_len=$(( $__tbuf_len + 1 )) done __trimq=$(( $__trim / $__tbuf_len )) __trim=$(( $__trim - $__tbuf_len * $__trimq )) while [ $__trimq -gt 0 ]; do __tmp="${__tmp%$__tbuf}" __trimq=$(( $__trimq - 1 )) done else __mask="$__tmp" while [ $__tbuf_len -lt $(( $__size / $__tbuf_len )) ]; do __tbuf="$__tbuf?" __tbuf_len=$(( $__tbuf_len + 1 )) done __trimq=$(( $__size / $__tbuf_len )) if [ $__size -ne $(( $__trimq * $__tbuf_len )) ]; then __tbuf="$__tbuf?" __tbuf_len=$(( $__tbuf_len + 1 )) fi __mask_len=$(( $__tmp_size - $__tbuf_len * $__trimq )) __trim=$(( $__tmp_size - $__mask_len - $__size )) while [ $__trimq -gt 0 ]; do __mask="${__mask#$__tbuf}" __trimq=$(( $__trimq - 1 )) done __tmp="${__tmp%"$__mask"}" fi done if [ "$__var_to_set" ]; then setvar "$__var_to_set" "$__tmp" else echo "$__tmp" fi } esac # f_sprintf $var_to_set $format [$arguments ...] # # Similar to sprintf(3), write a string into $var_to_set using printf(1) syntax # (`$format [$arguments ...]'). # case "$BASH_VERSION" in 3.1*|4.*) f_sprintf() { local __var_to_set="$1" __tmp shift 1 # var_to_set printf -v __tmp "$@" eval "$__var_to_set"=\"\${__tmp%\$NL}\" } ;; *) # NB: On FreeBSD, sh(1) runs this faster than bash(1) runs the above f_sprintf() { local __var_to_set="$1" shift 1 # var_to_set eval "$__var_to_set"=\$\( printf -- \"\$@\" \) } esac # f_vsprintf $var_to_set $format $format_args # # Similar to vsprintf(3), write a string into $var_to_set using printf(1) # syntax (`$format $format_args'). # f_vsprintf() { eval f_sprintf \"\$1\" \"\$2\" $3 } # f_snprintf $var_to_set $size $format [$arguments ...] # # Similar to snprintf(3), write at most $size number of bytes into $var_to_set # using printf(1) syntax (`$format [$arguments ...]'). # f_snprintf() { local __var_to_set="$1" __size="$2" shift 2 # var_to_set size local __f_snprintf_tmp f_sprintf __f_snprintf_tmp "$@" f_substr "$__var_to_set" "$__f_snprintf_tmp" 1 "$__size" } # f_vsnprintf $var_to_set $size $format $format_args # # Similar to vsnprintf(3), write at most $size number of bytes into $var_to_set # using printf(1) syntax (`$format $format_args'). The value of $var_to_set is # NULL unless at-least one byte is stored from the output. # # Example 1: # # limit=7 format="%s" # format_args="'abc 123'" # 3-spaces between abc and 123 # f_vsnprintf foo $limit "$format" "$format_args" # foo=[abc 1] # # Example 2: # # limit=12 format="%s %s" # format_args=" 'doghouse' 'fox' " # # even more spaces added to illustrate escape-method # f_vsnprintf foo $limit "$format" "$format_args" # foo=[doghouse fox] # # Example 3: # # limit=13 format="%s %s" # f_shell_escape arg1 'aaa"aaa' # arg1=[aaa"aaa] (no change) # f_shell_escape arg2 "aaa'aaa" # arg2=[aaa'\''aaa] (escaped s-quote) # format_args="'$arg1' '$arg2'" # use single-quotes to surround args # f_vsnprintf foo $limit "$format" "$format_args" # foo=[aaa"aaa aaa'a] # # In all of the above examples, the call to f_vsnprintf() does not change. Only # the contents of $limit, $format, and $format_args changes in each example. # f_vsnprintf() { eval f_snprintf \"\$1\" \"\$2\" \"\$3\" $4 } # f_replaceall $string $find $replace [$var_to_set] # # Replace all occurrences of $find in $string with $replace. If $var_to_set is # either missing or NULL, the variable name is produced on standard out for # capturing in a sub-shell (which is less recommended due to performance # degradation). # # To replace newlines or a sequence containing the newline character, use $NL # as `\n' is not supported. # f_replaceall() { local __left="" __right="$1" local __find="$2" __replace="$3" __var_to_set="$4" while :; do case "$__right" in *$__find*) __left="$__left${__right%%$__find*}$__replace" __right="${__right#*$__find}" continue esac break done __left="$__left${__right#*$__find}" if [ "$__var_to_set" ]; then setvar "$__var_to_set" "$__left" else echo "$__left" fi } # f_str2varname $string [$var_to_set] # # Convert a string into a suitable value to be used as a variable name # by converting unsuitable characters into the underscrore [_]. If $var_to_set # is either missing or NULL, the variable name is produced on standard out for # capturing in a sub-shell (which is less recommended due to performance # degradation). # f_str2varname() { local __string="$1" __var_to_set="$2" f_replaceall "$__string" "[!$VALID_VARNAME_CHARS]" "_" "$__var_to_set" } # f_shell_escape $string [$var_to_set] # # Escape $string for shell eval statement(s) by replacing all single-quotes # with a special sequence that creates a compound string when interpolated # by eval with surrounding single-quotes. # # For example: # # foo="abc'123" # f_shell_escape "$foo" bar # bar=[abc'\''123] # eval echo \'$bar\' # produces abc'123 # # This is helpful when processing an argument list that has to retain its # escaped structure for later evaluations. # # WARNING: Surrounding single-quotes are not added; this is the responsibility # of the code passing the escaped values to eval (which also aids readability). # f_shell_escape() { local __string="$1" __var_to_set="$2" f_replaceall "$__string" "'" "'\\''" "$__var_to_set" } # f_shell_unescape $string [$var_to_set] # # The antithesis of f_shell_escape(), this function takes an escaped $string # and expands it. # # For example: # # foo="abc'123" # f_shell_escape "$foo" bar # bar=[abc'\''123] # f_shell_unescape "$bar" # produces abc'123 # f_shell_unescape() { local __string="$1" __var_to_set="$2" f_replaceall "$__string" "'\\''" "'" "$__var_to_set" } # f_expand_number $string [$var_to_set] # # Unformat $string into a number, optionally to be stored in $var_to_set. This # function follows the SI power of two convention. # # The prefixes are: # # Prefix Description Multiplier # k kilo 1024 # M mega 1048576 # G giga 1073741824 # T tera 1099511627776 # P peta 1125899906842624 # E exa 1152921504606846976 # # NOTE: Prefixes are case-insensitive. # # Upon successful completion, success status is returned; otherwise the number # -1 is produced ($var_to_set set to -1 or if $var_to_set is NULL or missing) # on standard output. In the case of failure, the error status will be one of: # # Status Reason # 1 Given $string contains no digits # 2 An unrecognized prefix was given # 3 Result too large to calculate # f_expand_number() { local __string="$1" __var_to_set="$2" local __cp __num __bshift __maxinput # Remove any leading non-digits __string="${__string#${__string%%[0-9]*}}" # Store the numbers (no trailing suffix) __num="${__string%%[!0-9]*}" # Produce `-1' if string didn't contain any digits if [ ! "$__num" ]; then if [ "$__var_to_set" ]; then setvar "$__var_to_set" -1 else echo -1 fi return 1 # 1 = "Given $string contains no digits" fi # Remove all the leading numbers from the string to get at the prefix __string="${__string#"$__num"}" # # Test for invalid prefix (and determine bitshift length) # case "$__string" in ""|[[:space:]]*) # Shortcut if [ "$__var_to_set" ]; then setvar "$__var_to_set" $__num else echo $__num fi return $SUCCESS ;; [Kk]*) __bshift=10 ;; [Mm]*) __bshift=20 ;; [Gg]*) __bshift=30 ;; [Tt]*) __bshift=40 ;; [Pp]*) __bshift=50 ;; [Ee]*) __bshift=60 ;; *) # Unknown prefix if [ "$__var_to_set" ]; then setvar "$__var_to_set" -1 else echo -1 fi return 2 # 2 = "An unrecognized prefix was given" esac # Determine if the wheels fall off __maxinput=$(( 0x7fffffffffffffff >> $__bshift )) if [ $__num -gt $__maxinput ]; then # Input (before expanding) would exceed 64-bit signed int if [ "$__var_to_set" ]; then setvar "$__var_to_set" -1 else echo -1 fi return 3 # 3 = "Result too large to calculate" fi # Shift the number out and produce it __num=$(( $__num << $__bshift )) if [ "$__var_to_set" ]; then setvar "$__var_to_set" $__num else echo $__num fi } # f_longest_line_length # # Simple wrapper to an awk(1) script to print the length of the longest line of # input (read from stdin). Supports the newline escape-sequence `\n' for # splitting a single line into multiple lines. # f_longest_line_length_awk=' BEGIN { longest = 0 } { if (split($0, lines, /\\n/) > 1) { for (n in lines) { len = length(lines[n]) longest = ( len > longest ? len : longest ) } } else { len = length($0) longest = ( len > longest ? len : longest ) } } END { print longest } ' f_longest_line_length() { awk "$f_longest_line_length_awk" } # f_number_of_lines # # Simple wrapper to an awk(1) script to print the number of lines read from # stdin. Supports newline escape-sequence `\n' for splitting a single line into # multiple lines. # f_number_of_lines_awk=' BEGIN { num_lines = 0 } { num_lines += split(" "$0, unused, /\\n/) } END { print num_lines } ' f_number_of_lines() { awk "$f_number_of_lines_awk" } # f_uriencode [$text] # # Encode $text for the purpose of embedding safely into a URL. Non-alphanumeric # characters are converted to `%XX' sequence where XX represents the hexa- # decimal ordinal of the non-alphanumeric character. If $text is missing, data # is instead read from standard input. # f_uriencode_awk=' BEGIN { output = "" for (n = 0; n < 256; n++) pack[sprintf("%c", n)] = sprintf("%%%02x", n) } { sline = "" slen = length($0) for (n = 1; n <= slen; n++) { char = substr($0, n, 1) if ( char !~ /^[[:alnum:]_]$/ ) char = pack[char] sline = sline char } output = output ( output ? "%0a" : "" ) sline } END { print output } ' f_uriencode() { if [ $# -gt 0 ]; then echo "$1" | awk "$f_uriencode_awk" else awk "$f_uriencode_awk" fi } # f_uridecode [$text] # # Decode $text from a URI. Encoded characters are converted from their `%XX' # sequence into original unencoded ASCII sequences. If $text is missing, data # is instead read from standard input. # f_uridecode_awk=' BEGIN { for (n = 0; n < 256; n++) chr[n] = sprintf("%c", n) } { sline = "" slen = length($0) for (n = 1; n <= slen; n++) { seq = substr($0, n, 3) if ( seq ~ /^%[[:xdigit:]][[:xdigit:]]$/ ) { hex = substr(seq, 2, 2) sline = sline chr[sprintf("%u", "0x"hex)] n += 2 } else sline = sline substr(seq, 1, 1) } print sline } ' f_uridecode() { if [ $# -gt 0 ]; then echo "$1" | awk "$f_uridecode_awk" else awk "$f_uridecode_awk" fi } ############################################################ MAIN f_dprintf "%s: Successfully loaded." strings.subr fi # ! $_STRINGS_SUBR
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