Add printf(1)
This is a particularly interesting program. I managed to implement everything according to POSIX except how octal escapes are specified in the standard, which is yet another format compared to the one demanded for tr(1). This not only confuses people, it also adds unnecessary cruft for no real gain. So in order to be able to use unescape() easily and for consistency, I used our initial format \o[oo] instead of \0[ooo]. Marked as optional is UTF-8 support for %c in the POSIX specification. Given how well-developed libutf has become, doing this here was more or less trivial, putting us yet again ahead of the competition.
This commit is contained in:
FRIGN
parent
d7a438b2f8
commit
bafd41e1cf
2
README
2
README
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@ -51,7 +51,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
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=* nohup yes none
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#* paste yes none
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=* printenv non-posix none
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printf stolen stolen
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#* printf yes none
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=* pwd yes none
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= readlink non-posix none
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=* renice yes none
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|
|
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2
TODO
2
TODO
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@ -24,7 +24,7 @@ tput
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The following programs have been imported from OpenBSD and need
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replacing or cleaning up:
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printf
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(none)
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If you are looking for some work to do on sbase, another option is to
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pick a utility from the list in the README which has missing flags or
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387
printf.1
387
printf.1
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@ -1,386 +1,33 @@
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.\" $OpenBSD: src/usr.bin/printf/printf.1,v 1.27 2014/05/25 07:36:36 jmc Exp $
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.\"
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.\" Copyright (c) 1989, 1990 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Institute of Electrical and Electronics Engineers, Inc.
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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
|
||||
.\" 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.
|
||||
.\" 3. Neither the name of the University nor the names of its contributors
|
||||
.\" may be used to endorse or promote products derived from this software
|
||||
.\" without specific prior written permission.
|
||||
.\"
|
||||
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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
|
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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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.\" from: @(#)printf.1 5.11 (Berkeley) 7/24/91
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.\"
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.Dd $Mdocdate: May 13 2014 $
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.Dd February 15, 2015
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.Dt PRINTF 1
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.Os
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.Os sbase
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.Sh NAME
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.Nm printf
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.Nd formatted output
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.Nd print formatted data
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.Sh SYNOPSIS
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.Nm
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.Ar format
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.Op Ar argument ...
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.Op Ar arg ...
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.Sh DESCRIPTION
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.Nm
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formats and prints its arguments, after the first, under control
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of the
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.Ar format .
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The
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writes formatted data according to
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.Ar format
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is a character string which contains three types of objects: plain characters,
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which are simply copied to standard output, character escape sequences which
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are converted and copied to the standard output, and format specifications,
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each of which causes printing of the next successive
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.Ar argument .
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using each
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.Ar arg
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until drained.
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.Pp
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The arguments after the first are treated as strings
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if the corresponding format is
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.Cm b ,
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.Cm c
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or
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.Cm s ;
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otherwise it is evaluated as a C constant, with the following extensions:
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.Bl -bullet -offset indent
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.It
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A leading plus or minus sign is allowed.
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.It
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If the leading character is a single or double quote, the value is the
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.Tn ASCII
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code of the next character.
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.El
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.Pp
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The format string is reused as often as necessary to satisfy the arguments.
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Any extra format specifications are evaluated with zero or the null
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string.
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.Pp
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Character escape sequences are in backslash notation as defined in
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.St -ansiC .
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The characters and their meanings are as follows:
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.Pp
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.Bl -tag -width Ds -offset indent -compact
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.It Cm \ee
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Write an <escape> character.
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.It Cm \ea
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Write a <bell> character.
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.It Cm \eb
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Write a <backspace> character.
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.It Cm \ef
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Write a <form-feed> character.
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.It Cm \en
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Write a <new-line> character.
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.It Cm \er
|
||||
Write a <carriage return> character.
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.It Cm \et
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Write a <tab> character.
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.It Cm \ev
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Write a <vertical tab> character.
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.It Cm \e\'
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Write a <single quote> character.
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.It Cm \e\e
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Write a backslash character.
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.It Cm \e Ns Ar num
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Write an 8-bit character whose
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.Tn ASCII
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value is the 1-, 2-, or 3-digit
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octal number
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.Ar num .
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.El
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.Pp
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Each format specification is introduced by the percent
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.Pq Sq \&%
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character.
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The remainder of the format specifiers include,
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in the following order:
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.Bl -tag -width Ds
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.It "Zero or more of the following flags:"
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.Bl -tag -width Ds
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.It Cm #
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Specifies that the value should be printed in an
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.Dq alternate form .
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For the
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.Cm o
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format the precision of the number is increased to force the first
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character of the output string to a zero.
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For the
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.Cm x
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.Pq Cm X
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format, a non-zero result has the string
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.Li 0x
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.Pq Li 0X
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prepended to it.
|
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For
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.Cm a ,
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.Cm A ,
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.Cm e ,
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.Cm E ,
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.Cm f ,
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.Cm F ,
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.Cm g ,
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and
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.Cm G
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formats, the result will always contain a decimal point, even if no
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digits follow the point (normally, a decimal point only appears in the
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results of those formats if a digit follows the decimal point).
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For
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.Cm g
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and
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.Cm G
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formats, trailing zeros are not removed from the result as they
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would otherwise be.
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For all other formats, behaviour is undefined.
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.It Cm \&\-
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Specifies the
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.Em left adjustment
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of the output in the indicated field.
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.It Cm \&+
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Specifies that there should always be
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a sign placed before the number when using signed formats.
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.It Sq \&\ \&
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A space specifies that a blank should be left before a positive number
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for a signed format.
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A
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.Ql +
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overrides a space if both are used.
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.It Cm \&0
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A zero character specifies that zero-padding should be used
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rather than blank-padding.
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This flag is ignored if used with a precision
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specifier and any of the
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.Cm d , i , o , u ,
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or
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.Cm x
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.Pq Cm X
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formats.
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A
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.Ql \&-
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overrides a
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.Ql \&0
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if both are used.
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.El
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.It "Field Width:"
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An optional digit string specifying a
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.Em field width ;
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if the output string has fewer characters than the field width it will
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be blank-padded on the left (or right, if the left-adjustment indicator
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has been given) to make up the field width (note that a leading zero
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is a flag, but an embedded zero is part of a field width).
|
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.It Precision:
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An optional period
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.Pq Sq \&. ,
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followed by an optional digit string giving a
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.Em precision
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||||
which specifies the number of digits to appear after the decimal point,
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||||
for
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.Cm e
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and
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.Cm f
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formats, or the maximum number of characters to be printed
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from a string; if the digit string is missing, the precision is treated
|
||||
as zero.
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.It Format:
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A character which indicates the type of format to use (one of
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.Cm diouxXfFeEgGaAbcs ) .
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.El
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.Pp
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A field width or precision may be
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.Ql \&*
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instead of a digit string.
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||||
In this case an
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.Ar argument
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||||
supplies the field width or precision.
|
||||
.Pp
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||||
The format characters and their meanings are:
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.Bl -tag -width Fl
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.It Cm diouXx
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The
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.Ar argument
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||||
is printed as a signed decimal
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.Pq Cm d No or Cm i ,
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unsigned octal, unsigned decimal,
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||||
or unsigned hexadecimal
|
||||
.Pq Cm x No or Cm X ,
|
||||
respectively.
|
||||
.It Cm fF
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||||
The
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.Ar argument
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||||
is printed in the style
|
||||
.Sm off
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||||
.Pf [\-]ddd Cm \&. No ddd
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||||
.Sm on
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||||
where the number of d's
|
||||
after the decimal point is equal to the precision specification for
|
||||
the argument.
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||||
If the precision is missing, 6 digits are given; if the precision
|
||||
is explicitly 0, no digits and no decimal point are printed.
|
||||
.Pp
|
||||
If the argument is infinity, it will be converted to [-]inf
|
||||
.Pq Cm f
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||||
or [-]INF
|
||||
.Pq Cm F ,
|
||||
respectively.
|
||||
If the argument is not-a-number (NaN), it will be converted to
|
||||
[-]nan
|
||||
.Pq Cm f
|
||||
or [-]NAN
|
||||
.Pq Cm F ,
|
||||
respectively.
|
||||
.It Cm eE
|
||||
The
|
||||
.Ar argument
|
||||
is printed in the style
|
||||
.Sm off
|
||||
.Pf [\-]d Cm \&. No ddd Cm e No \*(Pmdd
|
||||
.Sm on
|
||||
where there
|
||||
is one digit before the decimal point and the number after is equal to
|
||||
the precision specification for the argument; when the precision is
|
||||
missing, 6 digits are produced.
|
||||
An upper-case
|
||||
.Sq E
|
||||
is used for an
|
||||
.Cm E
|
||||
format.
|
||||
.Pp
|
||||
If the argument is infinity, it will be converted to [-]inf
|
||||
.Pq Cm e
|
||||
or [-]INF
|
||||
.Pq Cm E ,
|
||||
respectively.
|
||||
If the argument is not-a-number (NaN), it will be converted to
|
||||
[-]nan
|
||||
.Pq Cm e
|
||||
or [-]NAN
|
||||
.Pq Cm E ,
|
||||
respectively.
|
||||
.It Cm gG
|
||||
The
|
||||
.Ar argument
|
||||
is printed in style
|
||||
.Cm f
|
||||
or in style
|
||||
.Cm e
|
||||
.Pq Cm E
|
||||
whichever gives full precision in minimum space.
|
||||
.Pp
|
||||
If the argument is infinity, it will be converted to [-]inf
|
||||
.Pq Cm g
|
||||
or [-]INF
|
||||
.Pq Cm G ,
|
||||
respectively.
|
||||
If the argument is not-a-number (NaN), it will be converted to
|
||||
[-]nan
|
||||
.Pq Cm g
|
||||
or [-]NAN
|
||||
.Pq Cm G ,
|
||||
respectively.
|
||||
.It Cm aA
|
||||
The
|
||||
.Ar argument
|
||||
is printed in style
|
||||
.Sm off
|
||||
.Pf [\-]0xh Cm \&. No hhh Cm p No [\*(Pm]d
|
||||
.Sm on
|
||||
where there is one digit before the hexadecimal point and the number
|
||||
after is equal to the precision specification for the argument.
|
||||
When the precision is missing, enough digits are produced to convey
|
||||
the argument's exact double-precision floating-point representation.
|
||||
.Pp
|
||||
If the argument is infinity, it will be converted to [-]inf
|
||||
.Pq Cm a
|
||||
or [-]INF
|
||||
.Pq Cm A ,
|
||||
respectively.
|
||||
If the argument is not-a-number (NaN), it will be converted to
|
||||
[-]nan
|
||||
.Pq Cm a
|
||||
or [-]NAN
|
||||
.Pq Cm A ,
|
||||
respectively.
|
||||
.It Cm b
|
||||
Characters from the string
|
||||
.Ar argument
|
||||
are printed with backslash-escape sequences expanded.
|
||||
.It Cm c
|
||||
The first character of
|
||||
.Ar argument
|
||||
is printed.
|
||||
.It Cm s
|
||||
Characters from the string
|
||||
.Ar argument
|
||||
are printed until the end is reached or until the number of characters
|
||||
indicated by the precision specification is reached; however if the
|
||||
precision is 0 or missing, all characters in the string are printed.
|
||||
.It Cm \&%
|
||||
Print a
|
||||
.Ql \&% ;
|
||||
no argument is used.
|
||||
.El
|
||||
.Pp
|
||||
In no case does a non-existent or small field width cause truncation of
|
||||
a field; padding takes place only if the specified field width exceeds
|
||||
the actual width.
|
||||
.Sh EXIT STATUS
|
||||
.Ex -std printf
|
||||
.Sh EXAMPLES
|
||||
Convert a hexadecimal value to decimal and print it out:
|
||||
.Pp
|
||||
.D1 Ic $ printf \&"%d\en\&" 0x20
|
||||
.Pp
|
||||
Print the decimal representation of the character 'a' (see
|
||||
.Xr ascii 7 ) :
|
||||
.Pp
|
||||
.D1 Ic $ printf \&"%d\en\&" \e'a
|
||||
.Sh SEE ALSO
|
||||
.Xr echo 1 ,
|
||||
.Nm
|
||||
interprets the standard escape sequences \e\e, \e', \e", \ea, \eb, \ee,
|
||||
\ef, \en, \er, \et, \ev, \exH[H], \eO[OO], the sequence \ec, which
|
||||
terminates further output if it's found inside
|
||||
.Ar format
|
||||
or a %b format string, the format specification %b for an unescaped string and all C
|
||||
.Xr printf 3
|
||||
format specifications ending with csdiouxXaAeEfFgG, including variable width and precision.
|
||||
.Sh STANDARDS
|
||||
The
|
||||
.Nm
|
||||
utility is compliant with the
|
||||
.St -p1003.1-2008
|
||||
specification.
|
||||
.Pp
|
||||
The escape sequences \ee and \e' are extensions to that specification.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Nm
|
||||
command appeared in
|
||||
.Bx 4.3 Reno .
|
||||
.Sh CAVEATS
|
||||
It is important never to pass a string with user-supplied data as a
|
||||
format without using
|
||||
.Ql %s .
|
||||
An attacker can put format specifiers in the string to mangle your stack,
|
||||
leading to a possible security hole.
|
||||
.Pp
|
||||
Always be sure to use the proper secure idiom:
|
||||
.Bd -literal -offset indent
|
||||
printf "%s" "$STRING"
|
||||
.Ed
|
||||
.Sh BUGS
|
||||
Since arguments are translated from
|
||||
.Tn ASCII
|
||||
to floating-point, and
|
||||
then back again, floating-point precision may be lost.
|
||||
specification except from the octal-escape format in %b format strings, which has been changed
|
||||
from \e0[ooo] to \eo[oo] for consistency reasons.
|
||||
|
|
|
|||
602
printf.c
602
printf.c
|
|
@ -1,497 +1,147 @@
|
|||
/* $OpenBSD: printf.c,v 1.22 2014/05/25 07:36:36 jmc Exp $ */
|
||||
|
||||
/*
|
||||
* Copyright (c) 1989 The Regents of the University of California.
|
||||
* 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.
|
||||
* 3. Neither the name of the University nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
||||
*/
|
||||
|
||||
/* See LICENSE file for copyright and license details. */
|
||||
#include <ctype.h>
|
||||
#include <limits.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <limits.h>
|
||||
#include <locale.h>
|
||||
#include <errno.h>
|
||||
#include <err.h>
|
||||
|
||||
static int print_escape_str(const char *);
|
||||
static int print_escape(const char *);
|
||||
#include "utf.h"
|
||||
#include "util.h"
|
||||
|
||||
static int getchr(void);
|
||||
static double getdouble(void);
|
||||
static int getint(void);
|
||||
static long getlong(void);
|
||||
static unsigned long getulong(void);
|
||||
static char *getstr(void);
|
||||
static char *mklong(const char *, int);
|
||||
static void check_conversion(const char *, const char *);
|
||||
static void usage(void);
|
||||
|
||||
static int rval;
|
||||
static char **gargv;
|
||||
|
||||
#define isodigit(c) ((c) >= '0' && (c) <= '7')
|
||||
#define octtobin(c) ((c) - '0')
|
||||
#define hextobin(c) ((c) >= 'A' && (c) <= 'F' ? c - 'A' + 10 : (c) >= 'a' && (c) <= 'f' ? c - 'a' + 10 : c - '0')
|
||||
|
||||
#define PF(f, func) { \
|
||||
if (havefieldwidth) \
|
||||
if (haveprecision) \
|
||||
(void)printf(f, fieldwidth, precision, func); \
|
||||
else \
|
||||
(void)printf(f, fieldwidth, func); \
|
||||
else if (haveprecision) \
|
||||
(void)printf(f, precision, func); \
|
||||
else \
|
||||
(void)printf(f, func); \
|
||||
}
|
||||
|
||||
int
|
||||
main(int argc, char *argv[])
|
||||
static void usage(void)
|
||||
{
|
||||
char *fmt, *start;
|
||||
int havefieldwidth, haveprecision;
|
||||
int fieldwidth, precision;
|
||||
char convch, nextch;
|
||||
char *format;
|
||||
|
||||
setlocale (LC_ALL, "");
|
||||
|
||||
/* Need to accept/ignore "--" option. */
|
||||
if (argc > 1 && strcmp(argv[1], "--") == 0) {
|
||||
argc--;
|
||||
argv++;
|
||||
eprintf("%s format [arg ...]\n", argv0);
|
||||
}
|
||||
|
||||
if (argc < 2) {
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
Rune *rarg;
|
||||
size_t i, j, argi, lastargi, formatlen, arglen;
|
||||
long long num;
|
||||
double dou;
|
||||
int cooldown = 0, width, precision;
|
||||
char *format, *tmp, *arg, *fmt;
|
||||
|
||||
argv0 = argv[0];
|
||||
if (argc < 2)
|
||||
usage();
|
||||
return (1);
|
||||
|
||||
format = argv[1];
|
||||
if ((tmp = strstr(format, "\\c"))) {
|
||||
*tmp = 0;
|
||||
cooldown = 1;
|
||||
}
|
||||
formatlen = unescape(format);
|
||||
|
||||
format = *++argv;
|
||||
gargv = ++argv;
|
||||
|
||||
#define SKIP1 "#-+ 0"
|
||||
#define SKIP2 "0123456789"
|
||||
do {
|
||||
/*
|
||||
* Basic algorithm is to scan the format string for conversion
|
||||
* specifications -- once one is found, find out if the field
|
||||
* width or precision is a '*'; if it is, gather up value.
|
||||
* Note, format strings are reused as necessary to use up the
|
||||
* provided arguments, arguments of zero/null string are
|
||||
* provided to use up the format string.
|
||||
*/
|
||||
|
||||
/* find next format specification */
|
||||
for (fmt = format; *fmt; fmt++) {
|
||||
switch (*fmt) {
|
||||
case '%':
|
||||
start = fmt++;
|
||||
|
||||
if (*fmt == '%') {
|
||||
putchar ('%');
|
||||
lastargi = 0;
|
||||
for (i = 0, argi = 2; !cooldown || i < formatlen; i++, i = cooldown ? i : (i % formatlen)) {
|
||||
if (i == 0) {
|
||||
if (lastargi == argi)
|
||||
break;
|
||||
} else if (*fmt == 'b') {
|
||||
char *p = getstr();
|
||||
if (print_escape_str(p)) {
|
||||
return (rval);
|
||||
lastargi = argi;
|
||||
}
|
||||
break;
|
||||
if (format[i] != '%') {
|
||||
putchar(format[i]);
|
||||
continue;
|
||||
}
|
||||
|
||||
/* skip to field width */
|
||||
for (; strchr(SKIP1, *fmt); ++fmt)
|
||||
;
|
||||
if (*fmt == '*') {
|
||||
++fmt;
|
||||
havefieldwidth = 1;
|
||||
fieldwidth = getint();
|
||||
} else
|
||||
havefieldwidth = 0;
|
||||
|
||||
/* skip to field precision */
|
||||
for (; strchr(SKIP2, *fmt); ++fmt)
|
||||
;
|
||||
haveprecision = 0;
|
||||
if (*fmt == '.') {
|
||||
++fmt;
|
||||
if (*fmt == '*') {
|
||||
++fmt;
|
||||
haveprecision = 1;
|
||||
precision = getint();
|
||||
}
|
||||
for (; strchr(SKIP2, *fmt); ++fmt)
|
||||
;
|
||||
}
|
||||
|
||||
if (!*fmt) {
|
||||
warnx ("missing format character");
|
||||
return(1);
|
||||
}
|
||||
|
||||
convch = *fmt;
|
||||
nextch = *(fmt + 1);
|
||||
*(fmt + 1) = '\0';
|
||||
switch(convch) {
|
||||
case 'c': {
|
||||
char p = getchr();
|
||||
PF(start, p);
|
||||
break;
|
||||
}
|
||||
case 's': {
|
||||
char *p = getstr();
|
||||
PF(start, p);
|
||||
break;
|
||||
}
|
||||
case 'd':
|
||||
case 'i': {
|
||||
long p;
|
||||
char *f = mklong(start, convch);
|
||||
if (!f) {
|
||||
warnx("out of memory");
|
||||
return (1);
|
||||
}
|
||||
p = getlong();
|
||||
PF(f, p);
|
||||
break;
|
||||
}
|
||||
case 'o':
|
||||
case 'u':
|
||||
case 'x':
|
||||
case 'X': {
|
||||
unsigned long p;
|
||||
char *f = mklong(start, convch);
|
||||
if (!f) {
|
||||
warnx("out of memory");
|
||||
return (1);
|
||||
}
|
||||
p = getulong();
|
||||
PF(f, p);
|
||||
break;
|
||||
}
|
||||
case 'a':
|
||||
case 'A':
|
||||
case 'e':
|
||||
case 'E':
|
||||
case 'f':
|
||||
case 'F':
|
||||
case 'g':
|
||||
case 'G': {
|
||||
double p = getdouble();
|
||||
PF(start, p);
|
||||
break;
|
||||
}
|
||||
default:
|
||||
warnx ("%s: invalid directive", start);
|
||||
return(1);
|
||||
}
|
||||
*(fmt + 1) = nextch;
|
||||
break;
|
||||
|
||||
case '\\':
|
||||
fmt += print_escape(fmt);
|
||||
break;
|
||||
|
||||
default:
|
||||
putchar (*fmt);
|
||||
break;
|
||||
}
|
||||
}
|
||||
} while (gargv > argv && *gargv);
|
||||
|
||||
return (rval);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Print SysV echo(1) style escape string
|
||||
* Halts processing string and returns 1 if a \c escape is encountered.
|
||||
*/
|
||||
static int
|
||||
print_escape_str(const char *str)
|
||||
{
|
||||
int value;
|
||||
int c;
|
||||
|
||||
while (*str) {
|
||||
if (*str == '\\') {
|
||||
str++;
|
||||
/*
|
||||
* %b string octal constants are not like those in C.
|
||||
* They start with a \0, and are followed by 0, 1, 2,
|
||||
* or 3 octal digits.
|
||||
*/
|
||||
if (*str == '0') {
|
||||
str++;
|
||||
for (c = 3, value = 0; c-- && isodigit(*str); str++) {
|
||||
value <<= 3;
|
||||
value += octtobin(*str);
|
||||
}
|
||||
putchar (value);
|
||||
str--;
|
||||
} else if (*str == 'c') {
|
||||
return 1;
|
||||
} else {
|
||||
str--;
|
||||
str += print_escape(str);
|
||||
}
|
||||
} else {
|
||||
putchar (*str);
|
||||
}
|
||||
str++;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Print "standard" escape characters
|
||||
*/
|
||||
static int
|
||||
print_escape(const char *str)
|
||||
{
|
||||
const char *start = str;
|
||||
int value;
|
||||
int c;
|
||||
|
||||
str++;
|
||||
|
||||
switch (*str) {
|
||||
case '0': case '1': case '2': case '3':
|
||||
case '4': case '5': case '6': case '7':
|
||||
for (c = 3, value = 0; c-- && isodigit(*str); str++) {
|
||||
value <<= 3;
|
||||
value += octtobin(*str);
|
||||
}
|
||||
putchar(value);
|
||||
return str - start - 1;
|
||||
/* NOTREACHED */
|
||||
|
||||
case 'x':
|
||||
str++;
|
||||
for (value = 0; isxdigit((unsigned char)*str); str++) {
|
||||
value <<= 4;
|
||||
value += hextobin(*str);
|
||||
}
|
||||
if (value > UCHAR_MAX) {
|
||||
warnx ("escape sequence out of range for character");
|
||||
rval = 1;
|
||||
}
|
||||
putchar (value);
|
||||
return str - start - 1;
|
||||
/* NOTREACHED */
|
||||
|
||||
case '\\': /* backslash */
|
||||
putchar('\\');
|
||||
break;
|
||||
|
||||
case '\'': /* single quote */
|
||||
putchar('\'');
|
||||
break;
|
||||
|
||||
case '"': /* double quote */
|
||||
putchar('"');
|
||||
break;
|
||||
|
||||
case 'a': /* alert */
|
||||
putchar('\a');
|
||||
break;
|
||||
|
||||
case 'b': /* backspace */
|
||||
putchar('\b');
|
||||
break;
|
||||
|
||||
case 'e': /* escape */
|
||||
putchar(033);
|
||||
break;
|
||||
|
||||
case 'f': /* form-feed */
|
||||
putchar('\f');
|
||||
break;
|
||||
|
||||
case 'n': /* newline */
|
||||
putchar('\n');
|
||||
break;
|
||||
|
||||
case 'r': /* carriage-return */
|
||||
putchar('\r');
|
||||
break;
|
||||
|
||||
case 't': /* tab */
|
||||
putchar('\t');
|
||||
break;
|
||||
|
||||
case 'v': /* vertical-tab */
|
||||
putchar('\v');
|
||||
break;
|
||||
|
||||
case '\0':
|
||||
warnx("null escape sequence");
|
||||
rval = 1;
|
||||
return 0;
|
||||
|
||||
default:
|
||||
putchar(*str);
|
||||
warnx("unknown escape sequence `\\%c'", *str);
|
||||
rval = 1;
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static char *
|
||||
mklong(const char *str, int ch)
|
||||
{
|
||||
static char *copy;
|
||||
static int copysize;
|
||||
int len;
|
||||
|
||||
len = strlen(str) + 2;
|
||||
if (copysize < len) {
|
||||
char *newcopy;
|
||||
copysize = len + 256;
|
||||
|
||||
newcopy = realloc(copy, copysize);
|
||||
if (newcopy == NULL) {
|
||||
copysize = 0;
|
||||
free(copy);
|
||||
copy = NULL;
|
||||
return (NULL);
|
||||
}
|
||||
copy = newcopy;
|
||||
}
|
||||
(void) memmove(copy, str, len - 3);
|
||||
copy[len - 3] = 'l';
|
||||
copy[len - 2] = ch;
|
||||
copy[len - 1] = '\0';
|
||||
return (copy);
|
||||
}
|
||||
|
||||
static int
|
||||
getchr(void)
|
||||
{
|
||||
if (!*gargv)
|
||||
return((int)'\0');
|
||||
return((int)**gargv++);
|
||||
}
|
||||
|
||||
static char *
|
||||
getstr(void)
|
||||
{
|
||||
if (!*gargv)
|
||||
return("");
|
||||
return(*gargv++);
|
||||
}
|
||||
|
||||
static char *number = "+-.0123456789";
|
||||
static int
|
||||
getint(void)
|
||||
{
|
||||
if (!*gargv)
|
||||
return(0);
|
||||
|
||||
if (strchr(number, **gargv))
|
||||
return(atoi(*gargv++));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static long
|
||||
getlong(void)
|
||||
{
|
||||
long val;
|
||||
char *ep;
|
||||
|
||||
if (!*gargv)
|
||||
return(0L);
|
||||
|
||||
if (**gargv == '\"' || **gargv == '\'')
|
||||
return (long) *((*gargv++)+1);
|
||||
|
||||
errno = 0;
|
||||
val = strtol (*gargv, &ep, 0);
|
||||
check_conversion(*gargv++, ep);
|
||||
return val;
|
||||
}
|
||||
|
||||
static unsigned long
|
||||
getulong(void)
|
||||
{
|
||||
unsigned long val;
|
||||
char *ep;
|
||||
|
||||
if (!*gargv)
|
||||
return(0UL);
|
||||
|
||||
if (**gargv == '\"' || **gargv == '\'')
|
||||
return (unsigned long) *((*gargv++)+1);
|
||||
|
||||
errno = 0;
|
||||
val = strtoul (*gargv, &ep, 0);
|
||||
check_conversion(*gargv++, ep);
|
||||
return val;
|
||||
}
|
||||
|
||||
static double
|
||||
getdouble(void)
|
||||
{
|
||||
double val;
|
||||
char *ep;
|
||||
|
||||
if (!*gargv)
|
||||
return(0.0);
|
||||
|
||||
if (**gargv == '\"' || **gargv == '\'')
|
||||
return (double) *((*gargv++)+1);
|
||||
|
||||
errno = 0;
|
||||
val = strtod (*gargv, &ep);
|
||||
check_conversion(*gargv++, ep);
|
||||
return val;
|
||||
}
|
||||
|
||||
static void
|
||||
check_conversion(const char *s, const char *ep)
|
||||
{
|
||||
if (*ep) {
|
||||
if (ep == s)
|
||||
warnx ("%s: expected numeric value", s);
|
||||
/* field width */
|
||||
width = 0;
|
||||
for (i++; strchr("#-+ 0", format[i]); i++);
|
||||
if (format[i] == '*') {
|
||||
if (argi < argc)
|
||||
width = estrtonum(argv[argi++], 0, INT_MAX);
|
||||
else
|
||||
warnx ("%s: not completely converted", s);
|
||||
rval = 1;
|
||||
} else if (errno == ERANGE) {
|
||||
(void)fprintf(stderr, "%s: %s\n", s, strerror(ERANGE));
|
||||
rval = 1;
|
||||
cooldown = 1;
|
||||
i++;
|
||||
} else {
|
||||
j = i;
|
||||
for (; strchr("+-0123456789", format[i]); i++);
|
||||
if (j != i) {
|
||||
tmp = estrndup(format + j, i - j);
|
||||
tmp[i - j] = 0;
|
||||
width = estrtonum(tmp, 0, INT_MAX);
|
||||
free(tmp);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
usage(void)
|
||||
{
|
||||
(void)fprintf(stderr, "usage: printf format [argument ...]\n");
|
||||
/* field precision */
|
||||
precision = 6;
|
||||
if (format[i] == '.') {
|
||||
if (format[++i] == '*') {
|
||||
if (argi < argc)
|
||||
precision = estrtonum(argv[argi++], 0, INT_MAX);
|
||||
else
|
||||
cooldown = 1;
|
||||
} else {
|
||||
j = i;
|
||||
for (; strchr("+-0123456789", format[i]); i++);
|
||||
if (j != i) {
|
||||
tmp = estrndup(format + j, i - j);
|
||||
tmp[i - j] = 0;
|
||||
precision = estrtonum(tmp, 0, INT_MAX);
|
||||
free(tmp);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (format[i] != '%') {
|
||||
if (argi < argc)
|
||||
arg = argv[argi++];
|
||||
else {
|
||||
arg = "";
|
||||
cooldown = 1;
|
||||
}
|
||||
} else
|
||||
putchar('%');
|
||||
|
||||
switch (format[i]) {
|
||||
case 'b':
|
||||
if ((tmp = strstr(arg, "\\c"))) {
|
||||
*tmp = 0;
|
||||
argi = argc;
|
||||
}
|
||||
unescape(arg);
|
||||
fputs(arg, stdout);
|
||||
break;
|
||||
case 'c':
|
||||
unescape(arg);
|
||||
rarg = emalloc((utflen(arg) + 1) * sizeof(*rarg));
|
||||
utftorunestr(arg, rarg);
|
||||
efputrune(rarg, stdout, "<stdout>");
|
||||
free(rarg);
|
||||
break;
|
||||
case 's':
|
||||
fputs(arg, stdout);
|
||||
break;
|
||||
case 'd': case 'i': case 'o': case 'u': case 'x': case 'X':
|
||||
arglen = strlen(arg);
|
||||
for (j = 0; j < arglen && isspace(arg[j]); j++);
|
||||
if (arg[j] == '\'' || arg[j] == '\"') {
|
||||
arg += j + 1;
|
||||
unescape(arg);
|
||||
rarg = emalloc((utflen(arg) + 1) * sizeof(*rarg));
|
||||
utftorunestr(arg, rarg);
|
||||
num = rarg[0];
|
||||
} else
|
||||
num = (strlen(arg) > 0) ? estrtonum(arg, LLONG_MIN, LLONG_MAX) : 0;
|
||||
fmt = estrdup("%*ll#");
|
||||
fmt[4] = format[i];
|
||||
printf(fmt, width, num);
|
||||
free(fmt);
|
||||
break;
|
||||
case 'a': case 'A': case 'e': case 'E': case 'f': case 'F': case 'g': case 'G':
|
||||
fmt = estrdup("%*.*#");
|
||||
fmt[4] = format[i];
|
||||
dou = (strlen(arg) > 0) ? estrtod(arg) : 0;
|
||||
printf(fmt, width, precision, dou);
|
||||
free(fmt);
|
||||
break;
|
||||
default:
|
||||
eprintf("Invalid format specifier '%c'.\n", format[i]);
|
||||
}
|
||||
if (argi >= argc)
|
||||
cooldown = 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
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Reference in New Issue
Block a user