693 lines
14 KiB
C
693 lines
14 KiB
C
/* $NetBSD: printf.c,v 1.35 2011/03/15 23:11:49 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 1.35 2011/03/15 23:11:49 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));
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static char *conv_escape(char *, char *);
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static char *conv_expand(const char *);
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static int 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 uintmax_t getuintmax(void);
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static char *getstr(void);
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static char *mklong(const char *, int);
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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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#ifdef main
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int main(int, char *[]);
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#endif
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int 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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int 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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while ((ch = getopt(argc, argv, "")) != -1) {
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switch (ch) {
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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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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);
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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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/* Ok - we've found a format specification,
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Save its address for a later printf(). */
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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 '.', get following precision */
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fmt += strspn(fmt, SKIP2);
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if (*fmt == '.') {
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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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} else
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precision = -1;
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fmt += strspn(fmt, SKIP2);
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ch = *fmt;
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if (!ch) {
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warnx("missing format character");
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return (1);
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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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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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/* 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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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);
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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);
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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 = getuintmax();
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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 'e':
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case 'E':
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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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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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return rval & ~0x100;
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}
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} while (gargv != argv && *gargv);
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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))
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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);
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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)
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{
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int value;
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int ch;
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char num_buf[4], *num_end;
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ch = *str++;
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switch (ch) {
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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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num_buf[0] = ch;
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ch = str[0];
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num_buf[1] = ch;
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num_buf[2] = ch ? str[1] : 0;
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num_buf[3] = 0;
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value = strtoul(num_buf, &num_end, 8);
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str += num_end - (num_buf + 1);
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break;
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case 'x':
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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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ch = str[0];
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num_buf[0] = ch;
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num_buf[1] = ch ? str[1] : 0;
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num_buf[2] = 0;
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value = strtoul(num_buf, &num_end, 16);
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str += num_end - num_buf;
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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 '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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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 = 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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int 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;
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while ((ch = *(const unsigned char *)str++) != '\0') {
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switch (ch) {
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/* Use C escapes for expected control characters */
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case '\\': ch = '\\'; break; /* backslash */
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case '\'': ch = '\''; break; /* single quote */
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case '"': ch = '"'; break; /* double quote */
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case '\a': ch = 'a'; break; /* alert */
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case '\b': ch = 'b'; break; /* backspace */
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case ESCAPE: ch = 'e'; break; /* escape */
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case '\f': ch = 'f'; break; /* form-feed */
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case '\n': ch = 'n'; break; /* newline */
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case '\r': ch = 'r'; break; /* carriage-return */
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case '\t': ch = 't'; break; /* tab */
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case '\v': ch = 'v'; break; /* vertical-tab */
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default:
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/* Copy anything printable */
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if (isprint(ch)) {
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*cp++ = ch;
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continue;
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}
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/* Use vis(3) encodings for the rest */
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*cp++ = '\\';
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if (ch & 0200) {
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*cp++ = 'M';
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ch &= ~0200;
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}
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if (ch == 0177) {
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*cp++ = '^';
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*cp++ = '?';
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continue;
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}
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if (ch < 040) {
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*cp++ = '^';
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*cp++ = ch | 0100;
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continue;
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}
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*cp++ = '-';
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*cp++ = ch;
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continue;
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}
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*cp++ = '\\';
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*cp++ = ch;
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}
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*cp = 0;
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return conv_str;
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}
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static char *
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mklong(const char *str, int ch)
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{
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static char copy[64];
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size_t len;
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len = strlen(str) + 2;
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if (len > sizeof copy) {
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warnx("format %s too complex\n", str);
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len = 4;
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}
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(void)memmove(copy, str, len - 3);
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copy[len - 3] = 'j';
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copy[len - 2] = ch;
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copy[len - 1] = '\0';
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return copy;
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}
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static int
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getchr(void)
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{
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if (!*gargv)
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return 0;
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return (int)**gargv++;
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}
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|
static char *
|
|
getstr(void)
|
|
{
|
|
static char empty[] = "";
|
|
if (!*gargv)
|
|
return empty;
|
|
return *gargv++;
|
|
}
|
|
|
|
static int
|
|
getwidth(void)
|
|
{
|
|
long val;
|
|
char *s, *ep;
|
|
|
|
s = *gargv;
|
|
if (!*gargv)
|
|
return (0);
|
|
gargv++;
|
|
|
|
errno = 0;
|
|
val = strtoul(s, &ep, 0);
|
|
check_conversion(s, ep);
|
|
|
|
/* Arbitrarily 'restrict' field widths to 1Mbyte */
|
|
if (val < 0 || val > 1 << 20) {
|
|
warnx("%s: invalid field width", s);
|
|
return 0;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
static intmax_t
|
|
getintmax(void)
|
|
{
|
|
intmax_t val;
|
|
char *cp, *ep;
|
|
|
|
cp = *gargv;
|
|
if (cp == NULL)
|
|
return 0;
|
|
gargv++;
|
|
|
|
if (*cp == '\"' || *cp == '\'')
|
|
return *(cp+1);
|
|
|
|
errno = 0;
|
|
val = strtoimax(cp, &ep, 0);
|
|
check_conversion(cp, ep);
|
|
return val;
|
|
}
|
|
|
|
static uintmax_t
|
|
getuintmax(void)
|
|
{
|
|
uintmax_t val;
|
|
char *cp, *ep;
|
|
|
|
cp = *gargv;
|
|
if (cp == NULL)
|
|
return 0;
|
|
gargv++;
|
|
|
|
if (*cp == '\"' || *cp == '\'')
|
|
return *(cp + 1);
|
|
|
|
/* strtoumax won't error -ve values */
|
|
while (isspace(*(unsigned char *)cp))
|
|
cp++;
|
|
if (*cp == '-') {
|
|
warnx("%s: expected positive numeric value", cp);
|
|
rval = 1;
|
|
return 0;
|
|
}
|
|
|
|
errno = 0;
|
|
val = strtoumax(cp, &ep, 0);
|
|
check_conversion(cp, 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);
|
|
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());
|
|
}
|