4.4BSD/usr/src/usr.bin/printf/printf.c
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if !defined(BUILTIN) && !defined(SHELL)
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#endif
#ifndef lint
static char sccsid[] = "@(#)printf.c 8.1 (Berkeley) 7/20/93";
#endif /* not lint */
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#ifdef SHELL
#define EOF -1
#else
#include <stdio.h>
#endif
#include <stdlib.h>
#include <string.h>
/*
* XXX
* This *has* to go away. TK.
*/
#ifdef SHELL
#define main printfcmd
#define warnx(a, b, c) { \
char buf[64]; \
(void)sprintf(buf, sizeof(buf), a, b, c); \
error(buf); \
}
#include "../../bin/sh/bltin/bltin.h"
#endif
#define PF(f, func) { \
if (fieldwidth) \
if (precision) \
(void)printf(f, fieldwidth, precision, func); \
else \
(void)printf(f, fieldwidth, func); \
else if (precision) \
(void)printf(f, precision, func); \
else \
(void)printf(f, func); \
}
static int asciicode __P((void));
static void escape __P((char *));
static int getchr __P((void));
static double getdouble __P((void));
static int getint __P((int *));
static int getlong __P((long *));
static char *getstr __P((void));
static char *mklong __P((char *, int));
static void usage __P((void));
static char **gargv;
int
#ifdef BUILTIN
progprintf(argc, argv)
#else
main(argc, argv)
#endif
int argc;
char *argv[];
{
extern int optind;
static char *skip1, *skip2;
int ch, end, fieldwidth, precision;
char convch, nextch, *format, *fmt, *start;
while ((ch = getopt(argc, argv, "")) != EOF)
switch (ch) {
case '?':
default:
usage();
return (1);
}
argc -= optind;
argv += optind;
if (argc < 1) {
usage();
return (1);
}
/*
* Basic algorithm is to scan the format string for conversion
* specifications -- once one is found, find out if the field
* width or precision is a '*'; if it is, gather up value. Note,
* format strings are reused as necessary to use up the provided
* arguments, arguments of zero/null string are provided to use
* up the format string.
*/
skip1 = "#-+ 0";
skip2 = "*0123456789";
escape(fmt = format = *argv); /* backslash interpretation */
gargv = ++argv;
for (;;) {
end = 0;
/* find next format specification */
next: for (start = fmt;; ++fmt) {
if (!*fmt) {
/* avoid infinite loop */
if (end == 1) {
warnx("missing format character",
NULL, NULL);
return (1);
}
end = 1;
if (fmt > start)
(void)printf("%s", start);
if (!*gargv)
return (0);
fmt = format;
goto next;
}
/* %% prints a % */
if (*fmt == '%') {
if (*++fmt != '%')
break;
*fmt++ = '\0';
(void)printf("%s", start);
goto next;
}
}
/* skip to field width */
for (; strchr(skip1, *fmt); ++fmt);
if (*fmt == '*') {
if (getint(&fieldwidth))
return (1);
} else
fieldwidth = 0;
/* skip to possible '.', get following precision */
for (; strchr(skip2, *fmt); ++fmt);
if (*fmt == '.')
++fmt;
if (*fmt == '*') {
if (getint(&precision))
return (1);
} else
precision = 0;
/* skip to conversion char */
for (; strchr(skip2, *fmt); ++fmt);
if (!*fmt) {
warnx("missing format character", NULL, NULL);
return (1);
}
convch = *fmt;
nextch = *++fmt;
*fmt = '\0';
switch(convch) {
case 'c': {
char p;
p = getchr();
PF(start, p);
break;
}
case 's': {
char *p;
p = getstr();
PF(start, p);
break;
}
case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': {
long p;
char *f;
if ((f = mklong(start, convch)) == NULL)
return (1);
if (getlong(&p))
return (1);
PF(f, p);
break;
}
case 'e': case 'E': case 'f': case 'g': case 'G': {
double p;
p = getdouble();
PF(start, p);
break;
}
default:
warnx("illegal format character", NULL, NULL);
return (1);
}
*fmt = nextch;
}
/* NOTREACHED */
}
static char *
mklong(str, ch)
char *str;
int ch;
{
static char copy[64];
int len;
len = strlen(str) + 2;
memmove(copy, str, len - 3);
copy[len - 3] = 'l';
copy[len - 2] = ch;
copy[len - 1] = '\0';
return (copy);
}
static void
escape(fmt)
register char *fmt;
{
register char *store;
register int value, c;
for (store = fmt; c = *fmt; ++fmt, ++store) {
if (c != '\\') {
*store = c;
continue;
}
switch (*++fmt) {
case '\0': /* EOS, user error */
*store = '\\';
*++store = '\0';
return;
case '\\': /* backslash */
case '\'': /* single quote */
*store = *fmt;
break;
case 'a': /* bell/alert */
*store = '\7';
break;
case 'b': /* backspace */
*store = '\b';
break;
case 'f': /* form-feed */
*store = '\f';
break;
case 'n': /* newline */
*store = '\n';
break;
case 'r': /* carriage-return */
*store = '\r';
break;
case 't': /* horizontal tab */
*store = '\t';
break;
case 'v': /* vertical tab */
*store = '\13';
break;
/* octal constant */
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
for (c = 3, value = 0;
c-- && *fmt >= '0' && *fmt <= '7'; ++fmt) {
value <<= 3;
value += *fmt - '0';
}
--fmt;
*store = value;
break;
default:
*store = *fmt;
break;
}
}
*store = '\0';
}
static int
getchr()
{
if (!*gargv)
return ('\0');
return ((int)**gargv++);
}
static char *
getstr()
{
if (!*gargv)
return ("");
return (*gargv++);
}
static char *Number = "+-.0123456789";
static int
getint(ip)
int *ip;
{
long val;
if (getlong(&val))
return (1);
if (val > INT_MAX) {
warnx("%s: %s", *gargv, strerror(ERANGE));
return (1);
}
*ip = val;
return (0);
}
static int
getlong(lp)
long *lp;
{
long val;
char *ep;
if (!*gargv) {
*lp = 0;
return (0);
}
if (strchr(Number, **gargv)) {
errno = 0;
val = strtol(*gargv, &ep, 0);
if (*ep != '\0') {
warnx("%s: illegal number", *gargv, NULL);
return (1);
}
if (errno == ERANGE)
if (val == LONG_MAX) {
warnx("%s: %s", *gargv, strerror(ERANGE));
return (1);
}
if (val == LONG_MIN) {
warnx("%s: %s", *gargv, strerror(ERANGE));
return (1);
}
*lp = val;
++gargv;
return (0);
}
*lp = (long)asciicode();
return (0);
}
static double
getdouble()
{
if (!*gargv)
return ((double)0);
if (strchr(Number, **gargv))
return (atof(*gargv++));
return ((double)asciicode());
}
static int
asciicode()
{
register int ch;
ch = **gargv;
if (ch == '\'' || ch == '"')
ch = (*gargv)[1];
++gargv;
return (ch);
}
static void
usage()
{
(void)fprintf(stderr, "usage: printf format [arg ...]\n");
}