774 lines
16 KiB
C
774 lines
16 KiB
C
/* $NetBSD: printf.c,v 1.54 2021/05/20 02:01:07 christos Exp $ */
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. 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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, 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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#include <sys/cdefs.h>
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#ifndef lint
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#if !defined(BUILTIN) && !defined(SHELL)
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__COPYRIGHT("@(#) Copyright (c) 1989, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif
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#endif
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)printf.c 8.2 (Berkeley) 3/22/95";
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#else
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__RCSID("$NetBSD: printf.c,v 1.54 2021/05/20 02:01:07 christos Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <locale.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef __GNUC__
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#define ESCAPE '\e'
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#else
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#define ESCAPE 033
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#endif
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static void conv_escape_str(char *, void (*)(int), int);
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static char *conv_escape(char *, char *, int);
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static char *conv_expand(const char *);
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static char getchr(void);
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static double getdouble(void);
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static int getwidth(void);
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static intmax_t getintmax(void);
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static char *getstr(void);
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static char *mklong(const char *, char);
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static intmax_t wide_char(const char *);
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static void check_conversion(const char *, const char *);
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static void usage(void);
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static void b_count(int);
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static void b_output(int);
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static size_t b_length;
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static char *b_fmt;
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static int rval;
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static char **gargv;
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#ifdef BUILTIN /* csh builtin */
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#define main progprintf
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#endif
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#ifdef SHELL /* sh (aka ash) builtin */
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#define main printfcmd
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#include "../../bin/sh/bltin/bltin.h"
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#endif /* SHELL */
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#define PF(f, func) { \
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if (fieldwidth != -1) { \
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if (precision != -1) \
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error = printf(f, fieldwidth, precision, func); \
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else \
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error = printf(f, fieldwidth, func); \
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} else if (precision != -1) \
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error = printf(f, precision, func); \
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else \
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error = printf(f, func); \
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}
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#define APF(cpp, f, func) { \
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if (fieldwidth != -1) { \
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if (precision != -1) \
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error = asprintf(cpp, f, fieldwidth, precision, func); \
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else \
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error = asprintf(cpp, f, fieldwidth, func); \
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} else if (precision != -1) \
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error = asprintf(cpp, f, precision, func); \
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else \
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error = asprintf(cpp, f, func); \
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}
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#define isodigit(c) ((c) >= '0' && (c) <= '7')
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#define octtobin(c) ((c) - '0')
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#define check(c, a) (c) >= (a) && (c) <= (a) + 5 ? (c) - (a) + 10
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#define hextobin(c) (check(c, 'a') : check(c, 'A') : (c) - '0')
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#ifdef main
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int main(int, char *[]);
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#endif
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int
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main(int argc, char *argv[])
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{
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char *fmt, *start;
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int fieldwidth, precision;
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char nextch;
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char *format;
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char ch;
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int error;
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#if !defined(SHELL) && !defined(BUILTIN)
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(void)setlocale (LC_ALL, "");
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#endif
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rval = 0; /* clear for builtin versions (avoid holdover) */
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clearerr(stdout); /* for the builtin version */
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/*
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* printf does not comply with Posix XBD 12.2 - there are no opts,
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* not even the -- end of options marker. Do not run getoot().
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*/
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if (argc > 2 && strchr(argv[1], '%') == NULL) {
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int o;
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/*
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* except that if there are multiple args and
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* the first (the nominal format) contains no '%'
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* conversions (which we will approximate as no '%'
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* characters at all, conversions or not) then the
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* results are unspecified, and we can do what we
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* like. So in that case, for some backward compat
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* to scripts which (stupidly) do:
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* printf -- format args
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* process this case the old way.
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*/
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while ((o = getopt(argc, argv, "")) != -1) {
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switch (o) {
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case '?':
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default:
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usage();
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return 1;
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}
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}
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argc -= optind;
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argv += optind;
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} else {
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argc -= 1; /* drop argv[0] (the program name) */
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argv += 1;
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}
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if (argc < 1) {
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usage();
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return 1;
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}
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format = *argv;
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gargv = ++argv;
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#define SKIP1 "#-+ 0'"
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#define SKIP2 "0123456789"
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do {
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/*
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* Basic algorithm is to scan the format string for conversion
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* specifications -- once one is found, find out if the field
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* width or precision is a '*'; if it is, gather up value.
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* Note, format strings are reused as necessary to use up the
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* provided arguments, arguments of zero/null string are
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* provided to use up the format string.
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*/
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/* find next format specification */
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for (fmt = format; (ch = *fmt++) != '\0';) {
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if (ch == '\\') {
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char c_ch;
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fmt = conv_escape(fmt, &c_ch, 0);
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putchar(c_ch);
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continue;
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}
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if (ch != '%' || (*fmt == '%' && ++fmt)) {
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(void)putchar(ch);
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continue;
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}
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/*
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* Ok - we've found a format specification,
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* Save its address for a later printf().
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*/
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start = fmt - 1;
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/* skip to field width */
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fmt += strspn(fmt, SKIP1);
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if (*fmt == '*') {
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fmt++;
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fieldwidth = getwidth();
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} else {
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fieldwidth = -1;
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/* skip to possible '.' for precision */
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fmt += strspn(fmt, SKIP2);
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}
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if (*fmt == '.') {
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/* get following precision */
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fmt++;
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if (*fmt == '*') {
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fmt++;
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precision = getwidth();
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} else {
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precision = -1;
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fmt += strspn(fmt, SKIP2);
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}
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} else
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precision = -1;
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ch = *fmt;
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if (!ch) {
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warnx("%s: missing format character", start);
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return 1;
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}
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/*
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* null terminate format string to we can use it
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* as an argument to printf.
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*/
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nextch = fmt[1];
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fmt[1] = 0;
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switch (ch) {
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case 'B': {
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const char *p = conv_expand(getstr());
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if (p == NULL)
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goto out;
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*fmt = 's';
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PF(start, p);
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if (error < 0)
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goto out;
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break;
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}
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case 'b': {
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/*
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* There has to be a better way to do this,
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* but the string we generate might have
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* embedded nulls
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*/
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static char *a, *t;
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char *cp = getstr();
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/* Free on entry in case shell longjumped out */
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if (a != NULL)
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free(a);
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a = NULL;
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if (t != NULL)
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free(t);
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t = NULL;
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/* Count number of bytes we want to output */
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b_length = 0;
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conv_escape_str(cp, b_count, 0);
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t = malloc(b_length + 1);
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if (t == NULL)
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goto out;
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(void)memset(t, 'x', b_length);
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t[b_length] = 0;
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/* Get printf to calculate the lengths */
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*fmt = 's';
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APF(&a, start, t);
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if (error == -1)
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goto out;
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b_fmt = a;
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/* Output leading spaces and data bytes */
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conv_escape_str(cp, b_output, 1);
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/* Add any trailing spaces */
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printf("%s", b_fmt);
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break;
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}
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case 'c': {
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char p = getchr();
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PF(start, p);
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if (error < 0)
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goto out;
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break;
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}
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case 's': {
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char *p = getstr();
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PF(start, p);
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if (error < 0)
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goto out;
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break;
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}
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case 'd':
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case 'i': {
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intmax_t p = getintmax();
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char *f = mklong(start, ch);
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PF(f, p);
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if (error < 0)
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goto out;
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break;
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}
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case 'o':
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case 'u':
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case 'x':
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case 'X': {
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uintmax_t p = (uintmax_t)getintmax();
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char *f = mklong(start, ch);
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PF(f, p);
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if (error < 0)
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goto out;
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break;
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}
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case 'a':
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case 'A':
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case 'e':
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case 'E':
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case 'f':
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case 'F':
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case 'g':
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case 'G': {
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double p = getdouble();
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PF(start, p);
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if (error < 0)
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goto out;
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break;
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}
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case '%':
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/* Don't ask, but this is useful ... */
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if (fieldwidth == 'N' && precision == 'B')
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return 0;
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/* FALLTHROUGH */
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default:
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warnx("%s: invalid directive", start);
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return 1;
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}
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*fmt++ = ch;
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*fmt = nextch;
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/* escape if a \c was encountered */
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if (rval & 0x100)
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goto done;
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}
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} while (gargv != argv && *gargv);
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done:
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(void)fflush(stdout);
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if (ferror(stdout)) {
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clearerr(stdout);
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err(1, "write error");
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}
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return rval & ~0x100;
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out:
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warn("print failed");
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return 1;
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}
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/* helper functions for conv_escape_str */
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static void
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/*ARGSUSED*/
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b_count(int ch)
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{
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b_length++;
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}
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/* Output one converted character for every 'x' in the 'format' */
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static void
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b_output(int ch)
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{
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for (;;) {
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switch (*b_fmt++) {
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case 0:
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b_fmt--;
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return;
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case ' ':
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putchar(' ');
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break;
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default:
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putchar(ch);
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return;
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}
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}
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}
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/*
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* Print SysV echo(1) style escape string
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* Halts processing string if a \c escape is encountered.
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*/
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static void
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conv_escape_str(char *str, void (*do_putchar)(int), int quiet)
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{
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int value;
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int ch;
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char c;
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while ((ch = *str++) != '\0') {
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if (ch != '\\') {
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do_putchar(ch);
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continue;
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}
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ch = *str++;
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if (ch == 'c') {
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/* \c as in SYSV echo - abort all processing.... */
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rval |= 0x100;
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break;
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}
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/*
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* %b string octal constants are not like those in C.
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* They start with a \0, and are followed by 0, 1, 2,
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* or 3 octal digits.
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*/
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if (ch == '0') {
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int octnum = 0, i;
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for (i = 0; i < 3; i++) {
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if (!isdigit((unsigned char)*str) || *str > '7')
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break;
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octnum = (octnum << 3) | (*str++ - '0');
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}
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do_putchar(octnum);
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continue;
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}
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/* \[M][^|-]C as defined by vis(3) */
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if (ch == 'M' && *str == '-') {
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do_putchar(0200 | str[1]);
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str += 2;
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continue;
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}
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if (ch == 'M' && *str == '^') {
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str++;
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value = 0200;
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ch = '^';
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} else
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value = 0;
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if (ch == '^') {
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ch = *str++;
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if (ch == '?')
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value |= 0177;
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else
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value |= ch & 037;
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do_putchar(value);
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continue;
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}
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/* Finally test for sequences valid in the format string */
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str = conv_escape(str - 1, &c, quiet);
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do_putchar(c);
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}
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}
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/*
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* Print "standard" escape characters
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*/
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static char *
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conv_escape(char *str, char *conv_ch, int quiet)
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{
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int value = 0;
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char ch, *begin;
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int c;
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ch = *str++;
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switch (ch) {
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case '\0':
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if (!quiet)
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warnx("incomplete escape sequence");
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rval = 1;
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value = '\\';
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--str;
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break;
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case '0': case '1': case '2': case '3':
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case '4': case '5': case '6': case '7':
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str--;
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for (c = 3; c-- && isodigit(*str); str++) {
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value <<= 3;
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value += octtobin(*str);
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}
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break;
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case 'x':
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/*
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* Hexadecimal character constants are not required to be
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* supported (by SuS v1) because there is no consistent
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* way to detect the end of the constant.
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* Supporting 2 byte constants is a compromise.
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*/
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begin = str;
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for (c = 2; c-- && isxdigit((unsigned char)*str); str++) {
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value <<= 4;
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value += hextobin(*str);
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}
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if (str == begin) {
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if (!quiet)
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warnx("\\x%s: missing hexadecimal number "
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"in escape", begin);
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rval = 1;
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}
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break;
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case '\\': value = '\\'; break; /* backslash */
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case '\'': value = '\''; break; /* single quote */
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case '"': value = '"'; break; /* double quote */
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case 'a': value = '\a'; break; /* alert */
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case 'b': value = '\b'; break; /* backspace */
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case 'e': value = ESCAPE; break; /* escape */
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case 'E': value = ESCAPE; break; /* escape */
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case 'f': value = '\f'; break; /* form-feed */
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case 'n': value = '\n'; break; /* newline */
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case 'r': value = '\r'; break; /* carriage-return */
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case 't': value = '\t'; break; /* tab */
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case 'v': value = '\v'; break; /* vertical-tab */
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default:
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if (!quiet)
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warnx("unknown escape sequence `\\%c'", ch);
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rval = 1;
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value = ch;
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break;
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}
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*conv_ch = (char)value;
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return str;
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}
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/* expand a string so that everything is printable */
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static char *
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conv_expand(const char *str)
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{
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static char *conv_str;
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char *cp;
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char ch;
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if (conv_str)
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free(conv_str);
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/* get a buffer that is definitely large enough.... */
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conv_str = malloc(4 * strlen(str) + 1);
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if (!conv_str)
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return NULL;
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cp = conv_str;
|
|
|
|
while ((ch = *(const char *)str++) != '\0') {
|
|
switch (ch) {
|
|
/* Use C escapes for expected control characters */
|
|
case '\\': ch = '\\'; break; /* backslash */
|
|
case '\'': ch = '\''; break; /* single quote */
|
|
case '"': ch = '"'; break; /* double quote */
|
|
case '\a': ch = 'a'; break; /* alert */
|
|
case '\b': ch = 'b'; break; /* backspace */
|
|
case ESCAPE: ch = 'e'; break; /* escape */
|
|
case '\f': ch = 'f'; break; /* form-feed */
|
|
case '\n': ch = 'n'; break; /* newline */
|
|
case '\r': ch = 'r'; break; /* carriage-return */
|
|
case '\t': ch = 't'; break; /* tab */
|
|
case '\v': ch = 'v'; break; /* vertical-tab */
|
|
default:
|
|
/* Copy anything printable */
|
|
if (isprint((unsigned char)ch)) {
|
|
*cp++ = ch;
|
|
continue;
|
|
}
|
|
/* Use vis(3) encodings for the rest */
|
|
*cp++ = '\\';
|
|
if (ch & 0200) {
|
|
*cp++ = 'M';
|
|
ch &= (char)~0200;
|
|
}
|
|
if (ch == 0177) {
|
|
*cp++ = '^';
|
|
*cp++ = '?';
|
|
continue;
|
|
}
|
|
if (ch < 040) {
|
|
*cp++ = '^';
|
|
*cp++ = ch | 0100;
|
|
continue;
|
|
}
|
|
*cp++ = '-';
|
|
*cp++ = ch;
|
|
continue;
|
|
}
|
|
*cp++ = '\\';
|
|
*cp++ = ch;
|
|
}
|
|
|
|
*cp = 0;
|
|
return conv_str;
|
|
}
|
|
|
|
static char *
|
|
mklong(const char *str, char ch)
|
|
{
|
|
static char copy[64];
|
|
size_t len;
|
|
|
|
len = strlen(str) + 2;
|
|
if (len > sizeof copy) {
|
|
warnx("format \"%s\" too complex", str);
|
|
len = 4;
|
|
rval = 1;
|
|
}
|
|
(void)memmove(copy, str, len - 3);
|
|
copy[len - 3] = 'j';
|
|
copy[len - 2] = ch;
|
|
copy[len - 1] = '\0';
|
|
return copy;
|
|
}
|
|
|
|
static char
|
|
getchr(void)
|
|
{
|
|
if (!*gargv)
|
|
return 0;
|
|
return **gargv++;
|
|
}
|
|
|
|
static char *
|
|
getstr(void)
|
|
{
|
|
static char empty[] = "";
|
|
if (!*gargv)
|
|
return empty;
|
|
return *gargv++;
|
|
}
|
|
|
|
static int
|
|
getwidth(void)
|
|
{
|
|
unsigned long val;
|
|
char *s, *ep;
|
|
|
|
s = *gargv;
|
|
if (s == NULL)
|
|
return 0;
|
|
gargv++;
|
|
|
|
errno = 0;
|
|
val = strtoul(s, &ep, 0);
|
|
check_conversion(s, ep);
|
|
|
|
/* Arbitrarily 'restrict' field widths to 1Mbyte */
|
|
if (val > 1 << 20) {
|
|
warnx("%s: invalid field width", s);
|
|
return 0;
|
|
}
|
|
|
|
return (int)val;
|
|
}
|
|
|
|
static intmax_t
|
|
getintmax(void)
|
|
{
|
|
intmax_t val;
|
|
char *cp, *ep;
|
|
|
|
cp = *gargv;
|
|
if (cp == NULL)
|
|
return 0;
|
|
gargv++;
|
|
|
|
if (*cp == '\"' || *cp == '\'')
|
|
return wide_char(cp);
|
|
|
|
errno = 0;
|
|
val = strtoimax(cp, &ep, 0);
|
|
check_conversion(cp, ep);
|
|
return val;
|
|
}
|
|
|
|
static double
|
|
getdouble(void)
|
|
{
|
|
double val;
|
|
char *ep;
|
|
|
|
if (!*gargv)
|
|
return 0.0;
|
|
|
|
/* This is a NetBSD extension, not required by POSIX (it is useless) */
|
|
if (*(ep = *gargv) == '\"' || *ep == '\'')
|
|
return (double)wide_char(ep);
|
|
|
|
errno = 0;
|
|
val = strtod(*gargv, &ep);
|
|
check_conversion(*gargv++, ep);
|
|
return val;
|
|
}
|
|
|
|
/*
|
|
* XXX This is just a placeholder for a later version which
|
|
* will do mbtowc() on p+1 (and after checking that all of the
|
|
* string has been consumed) return that value.
|
|
*
|
|
* This (mbtowc) behaviour is required by POSIX (as is the check
|
|
* that the whole arg is consumed).
|
|
*
|
|
* What follows is actually correct if we assume that LC_CTYPE=C
|
|
* (or something else similar that is a single byte charset).
|
|
*/
|
|
static intmax_t
|
|
wide_char(const char *p)
|
|
{
|
|
intmax_t ch = (intmax_t)(unsigned char)p[1];
|
|
|
|
if (ch != 0 && p[2] != '\0') {
|
|
warnx("%s: not completely converted", p);
|
|
rval = 1;
|
|
}
|
|
|
|
return ch;
|
|
}
|
|
|
|
static void
|
|
check_conversion(const char *s, const char *ep)
|
|
{
|
|
if (*ep) {
|
|
if (ep == s)
|
|
warnx("%s: expected numeric value", s);
|
|
else
|
|
warnx("%s: not completely converted", s);
|
|
rval = 1;
|
|
} else if (errno == ERANGE) {
|
|
warnx("%s: %s", s, strerror(ERANGE));
|
|
rval = 1;
|
|
}
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr, "Usage: %s format [arg ...]\n", getprogname());
|
|
}
|