NetBSD/usr.bin/printf/printf.c

310 lines
6.9 KiB
C

/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
/*static char sccsid[] = "from: @(#)printf.c 5.9 (Berkeley) 6/1/90";*/
static char rcsid[] = "$Id: printf.c,v 1.3 1993/08/01 18:10:03 mycroft Exp $";
#endif /* not lint */
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#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); \
}
char **gargv;
main(argc, argv)
int argc;
char **argv;
{
static char *skip1, *skip2;
register char *format, *fmt, *start;
register int end, fieldwidth, precision;
char convch, nextch, *getstr(), *mklong();
double getdouble();
long getlong();
if (argc < 2) {
fprintf(stderr, "usage: printf format [arg ...]\n");
exit(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) {
fprintf(stderr,
"printf: missing format character.\n");
exit(1);
}
end = 1;
if (fmt > start)
(void)printf("%s", start);
if (!*gargv)
exit(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 (; index(skip1, *fmt); ++fmt);
fieldwidth = *fmt == '*' ? getint() : 0;
/* skip to possible '.', get following precision */
for (; index(skip2, *fmt); ++fmt);
if (*fmt == '.')
++fmt;
precision = *fmt == '*' ? getint() : 0;
/* skip to conversion char */
for (; index(skip2, *fmt); ++fmt);
if (!*fmt) {
fprintf(stderr, "printf: missing format character.\n");
exit(1);
}
convch = *fmt;
nextch = *++fmt;
*fmt = '\0';
switch(convch) {
case 'c': {
char p = getchr();
PF(start, p);
break;
}
case 's': {
char *p = getstr();
PF(start, p);
break;
}
case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': {
char *f = mklong(start, convch);
long p = getlong();
PF(f, p);
break;
}
case 'e': case 'E': case 'f': case 'g': case 'G': {
double p = getdouble();
PF(start, p);
break;
}
default:
fprintf(stderr, "printf: illegal format character.\n");
exit(1);
}
*fmt = nextch;
}
/* NOTREACHED */
}
char *
mklong(str, ch)
char *str, ch;
{
int len;
char *copy, *malloc();
len = strlen(str) + 2;
if (!(copy = malloc((u_int)len))) { /* never freed; XXX */
fprintf(stderr, "printf: out of memory.\n");
exit(1);
}
bcopy(str, copy, len - 3);
copy[len - 3] = 'l';
copy[len - 2] = ch;
copy[len - 1] = '\0';
return(copy);
}
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';
}
getchr()
{
if (!*gargv)
return((int)'\0');
return((int)**gargv++);
}
char *
getstr()
{
if (!*gargv)
return("");
return(*gargv++);
}
static char *number = "+-.0123456789";
getint()
{
if (!*gargv)
return(0);
if (index(number, **gargv))
return(atoi(*gargv++));
return(asciicode());
}
long
getlong()
{
long atol();
if (!*gargv)
return((long)0);
if (index(number, **gargv))
return(strtol(*gargv++, (char **)NULL, 0));
return((long)asciicode());
}
double
getdouble()
{
double atof();
if (!*gargv)
return((double)0);
if (index(number, **gargv))
return(atof(*gargv++));
return((double)asciicode());
}
asciicode()
{
register char ch;
ch = **gargv;
if (ch == '\'' || ch == '"')
ch = (*gargv)[1];
++gargv;
return(ch);
}