405 lines
8.2 KiB
C
405 lines
8.2 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#if !defined(BUILTIN) && !defined(SHELL)
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#endif
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#ifndef lint
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static char sccsid[] = "@(#)printf.c 8.1 (Berkeley) 7/20/93";
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#endif /* not lint */
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.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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#ifdef SHELL
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#define main printfcmd
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#include "bltin/bltin.h"
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#endif
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#define PF(f, func) { \
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if (fieldwidth) \
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if (precision) \
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(void)printf(f, fieldwidth, precision, func); \
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else \
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(void)printf(f, fieldwidth, func); \
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else if (precision) \
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(void)printf(f, precision, func); \
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else \
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(void)printf(f, func); \
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}
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static int asciicode __P((void));
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static void escape __P((char *));
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static int getchr __P((void));
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static double getdouble __P((void));
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static int getint __P((int *));
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static int getlong __P((long *));
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static char *getstr __P((void));
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static char *mklong __P((char *, int));
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static void usage __P((void));
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static char **gargv;
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int
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#ifdef BUILTIN
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progprintf(argc, argv)
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#else
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main(argc, argv)
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#endif
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int argc;
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char *argv[];
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{
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extern int optind;
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static char *skip1, *skip2;
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int ch, end, fieldwidth, precision;
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char convch, nextch, *format, *fmt, *start;
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while ((ch = getopt(argc, argv, "")) != EOF)
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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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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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/*
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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. Note,
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* format strings are reused as necessary to use up the provided
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* arguments, arguments of zero/null string are provided to use
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* up the format string.
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*/
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skip1 = "#-+ 0";
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skip2 = "0123456789";
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escape(fmt = format = *argv); /* backslash interpretation */
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gargv = ++argv;
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for (;;) {
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end = 0;
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/* find next format specification */
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next: for (start = fmt;; ++fmt) {
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if (!*fmt) {
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/* avoid infinite loop */
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if (end == 1) {
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warnx("missing format character",
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NULL, NULL);
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return (1);
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}
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end = 1;
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if (fmt > start)
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(void)printf("%s", start);
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if (!*gargv)
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return (0);
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fmt = format;
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goto next;
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}
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/* %% prints a % */
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if (*fmt == '%') {
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if (*++fmt != '%')
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break;
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*fmt++ = '\0';
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(void)printf("%s", start);
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goto next;
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}
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}
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/* skip to field width */
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for (; strchr(skip1, *fmt); ++fmt);
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if (*fmt == '*') {
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if (getint(&fieldwidth))
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return (1);
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++fmt;
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} else {
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fieldwidth = 0;
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/* skip to possible '.', get following precision */
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for (; strchr(skip2, *fmt); ++fmt);
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}
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if (*fmt == '.') {
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/* precision present? */
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++fmt;
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if (*fmt == '*') {
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if (getint(&precision))
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return (1);
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++fmt;
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} else {
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precision = 0;
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/* skip to conversion char */
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for (; strchr(skip2, *fmt); ++fmt);
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}
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} else
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precision = 0;
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if (!*fmt) {
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warnx("missing format character", NULL, NULL);
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return (1);
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}
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convch = *fmt;
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nextch = *++fmt;
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*fmt = '\0';
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switch(convch) {
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case 'c': {
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char p;
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p = getchr();
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PF(start, p);
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break;
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}
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case 's': {
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char *p;
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p = getstr();
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PF(start, p);
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break;
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}
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case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': {
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long p;
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char *f;
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if ((f = mklong(start, convch)) == NULL)
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return (1);
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if (getlong(&p))
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return (1);
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PF(f, p);
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break;
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}
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case 'e': case 'E': case 'f': case 'g': case 'G': {
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double p;
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p = getdouble();
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PF(start, p);
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break;
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}
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default:
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warnx("illegal format character %c", convch, NULL);
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return (1);
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}
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*fmt = nextch;
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}
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/* NOTREACHED */
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}
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static char *
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mklong(str, ch)
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char *str;
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int ch;
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{
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static char copy[64];
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int len;
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len = strlen(str) + 2;
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memmove(copy, str, len - 3);
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copy[len - 3] = 'l';
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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 void
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escape(fmt)
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register char *fmt;
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{
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register char *store;
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register int value, c;
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for (store = fmt; c = *fmt; ++fmt, ++store) {
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if (c != '\\') {
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*store = c;
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continue;
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}
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switch (*++fmt) {
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case '\0': /* EOS, user error */
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*store = '\\';
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*++store = '\0';
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return;
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case '\\': /* backslash */
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case '\'': /* single quote */
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*store = *fmt;
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break;
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case 'a': /* bell/alert */
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*store = '\7';
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break;
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case 'b': /* backspace */
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*store = '\b';
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break;
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case 'f': /* form-feed */
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*store = '\f';
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break;
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case 'n': /* newline */
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*store = '\n';
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break;
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case 'r': /* carriage-return */
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*store = '\r';
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break;
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case 't': /* horizontal tab */
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*store = '\t';
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break;
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case 'v': /* vertical tab */
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*store = '\13';
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break;
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/* octal constant */
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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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for (c = 3, value = 0;
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c-- && *fmt >= '0' && *fmt <= '7'; ++fmt) {
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value <<= 3;
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value += *fmt - '0';
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}
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--fmt;
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*store = value;
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break;
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default:
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*store = *fmt;
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break;
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}
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}
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*store = '\0';
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}
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static int
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getchr()
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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 *
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getstr()
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{
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if (!*gargv)
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return ("");
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return (*gargv++);
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}
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static char *Number = "+-.0123456789";
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static int
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getint(ip)
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int *ip;
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{
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long val;
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if (getlong(&val))
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return (1);
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if (val > INT_MAX) {
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warnx("%s: %s", *gargv, strerror(ERANGE));
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return (1);
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}
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*ip = val;
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return (0);
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}
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static int
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getlong(lp)
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long *lp;
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{
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long val;
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char *ep;
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if (!*gargv) {
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*lp = 0;
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return (0);
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}
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if (strchr(Number, **gargv)) {
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errno = 0;
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val = strtol(*gargv, &ep, 0);
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if (*ep != '\0') {
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warnx("%s: illegal number", *gargv, NULL);
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return (1);
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}
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if (errno == ERANGE)
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if (val == LONG_MAX) {
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warnx("%s: %s", *gargv, strerror(ERANGE));
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return (1);
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}
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if (val == LONG_MIN) {
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warnx("%s: %s", *gargv, strerror(ERANGE));
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return (1);
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}
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*lp = val;
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++gargv;
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return (0);
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}
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*lp = (long)asciicode();
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return (0);
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}
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static double
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getdouble()
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{
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if (!*gargv)
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return ((double)0);
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if (strchr(Number, **gargv))
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return (atof(*gargv++));
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return ((double)asciicode());
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}
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static int
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asciicode()
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{
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register int ch;
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ch = **gargv;
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if (ch == '\'' || ch == '"')
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ch = (*gargv)[1];
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++gargv;
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return (ch);
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}
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static void
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usage()
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{
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(void)fprintf(stderr, "usage: printf format [arg ...]\n");
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}
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