OpenBSD-4.6/usr.bin/printf/printf.c
/* $OpenBSD: printf.c,v 1.14 2008/09/08 17:04:20 martynas Exp $ */
/*
* 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. 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
#if !defined(SHELL) && !defined(BUILTIN)
char copyright[] =
"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
All rights reserved.\n";
#endif
#endif /* not lint */
#ifndef lint
/*static char sccsid[] = "from: @(#)printf.c 5.9 (Berkeley) 6/1/90";*/
static char rcsid[] = "$OpenBSD: printf.c,v 1.14 2008/09/08 17:04:20 martynas Exp $";
#endif /* not lint */
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <locale.h>
#include <errno.h>
#include <err.h>
static int print_escape_str(const char *);
static int print_escape(const char *);
static int getchr(void);
static double getdouble(void);
static int getint(void);
static long getlong(void);
static unsigned long getulong(void);
static char *getstr(void);
static char *mklong(const char *, int);
static void check_conversion(const char *, const char *);
static void usage(void);
static int rval;
static char **gargv;
#define isodigit(c) ((c) >= '0' && (c) <= '7')
#define octtobin(c) ((c) - '0')
#define hextobin(c) ((c) >= 'A' && (c) <= 'F' ? c - 'A' + 10 : (c) >= 'a' && (c) <= 'f' ? c - 'a' + 10 : c - '0')
#ifdef SHELL
#define main printfcmd
#include "../../bin/sh/bltin/bltin.h"
#include <stdarg.h>
static void
warnx(const char *fmt, ...)
{
char buf[64];
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof buf, fmt, ap);
va_end(ap);
error(buf);
}
#endif /* SHELL */
#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); \
}
int
#ifdef BUILTIN
progprintf(int argc, char *argv[])
#else
main(int argc, char *argv[])
#endif
{
char *fmt, *start;
int fieldwidth, precision;
char convch, nextch;
char *format;
#if !defined(SHELL) && !defined(BUILTIN)
setlocale (LC_ALL, "");
#endif
/* Need to accept/ignore "--" option. */
if (argc > 1 && strcmp(argv[1], "--") == 0) {
argc--;
argv++;
}
if (argc < 2) {
usage();
return (1);
}
format = *++argv;
gargv = ++argv;
#define SKIP1 "#-+ 0"
#define SKIP2 "*0123456789"
do {
/*
* 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.
*/
/* find next format specification */
for (fmt = format; *fmt; fmt++) {
switch (*fmt) {
case '%':
start = fmt++;
if (*fmt == '%') {
putchar ('%');
break;
} else if (*fmt == 'b') {
char *p = getstr();
if (print_escape_str(p)) {
return (rval);
}
break;
}
/* skip to field width */
for (; strchr(SKIP1, *fmt); ++fmt) ;
fieldwidth = *fmt == '*' ? getint() : 0;
/* skip to possible '.', get following precision */
for (; strchr(SKIP2, *fmt); ++fmt) ;
if (*fmt == '.')
++fmt;
precision = *fmt == '*' ? getint() : 0;
for (; strchr(SKIP2, *fmt); ++fmt) ;
if (!*fmt) {
warnx ("missing format character");
return(1);
}
convch = *fmt;
nextch = *(fmt + 1);
*(fmt + 1) = '\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': {
long p;
char *f = mklong(start, convch);
if (!f) {
warnx("out of memory");
return (1);
}
p = getlong();
PF(f, p);
break;
}
case 'o':
case 'u':
case 'x':
case 'X': {
unsigned long p;
char *f = mklong(start, convch);
if (!f) {
warnx("out of memory");
return (1);
}
p = getulong();
PF(f, p);
break;
}
case 'a':
case 'A':
case 'e':
case 'E':
case 'f':
case 'F':
case 'g':
case 'G': {
double p = getdouble();
PF(start, p);
break;
}
default:
warnx ("%s: invalid directive", start);
return(1);
}
*(fmt + 1) = nextch;
break;
case '\\':
fmt += print_escape(fmt);
break;
default:
putchar (*fmt);
break;
}
}
} while (gargv > argv && *gargv);
return (rval);
}
/*
* Print SysV echo(1) style escape string
* Halts processing string and returns 1 if a \c escape is encountered.
*/
static int
print_escape_str(const char *str)
{
int value;
int c;
while (*str) {
if (*str == '\\') {
str++;
/*
* %b string octal constants are not like those in C.
* They start with a \0, and are followed by 0, 1, 2,
* or 3 octal digits.
*/
if (*str == '0') {
str++;
for (c = 3, value = 0; c-- && isodigit(*str); str++) {
value <<= 3;
value += octtobin(*str);
}
putchar (value);
str--;
} else if (*str == 'c') {
return 1;
} else {
str--;
str += print_escape(str);
}
} else {
putchar (*str);
}
str++;
}
return 0;
}
/*
* Print "standard" escape characters
*/
static int
print_escape(const char *str)
{
const char *start = str;
int value;
int c;
str++;
switch (*str) {
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
for (c = 3, value = 0; c-- && isodigit(*str); str++) {
value <<= 3;
value += octtobin(*str);
}
putchar(value);
return str - start - 1;
/* NOTREACHED */
case 'x':
str++;
for (value = 0; isxdigit(*str); str++) {
value <<= 4;
value += hextobin(*str);
}
if (value > UCHAR_MAX) {
warnx ("escape sequence out of range for character");
rval = 1;
}
putchar (value);
return str - start - 1;
/* NOTREACHED */
case '\\': /* backslash */
putchar('\\');
break;
case '\'': /* single quote */
putchar('\'');
break;
case '"': /* double quote */
putchar('"');
break;
case 'a': /* alert */
putchar('\a');
break;
case 'b': /* backspace */
putchar('\b');
break;
case 'e': /* escape */
#ifdef __GNUC__
putchar('\e');
#else
putchar(033);
#endif
break;
case 'f': /* form-feed */
putchar('\f');
break;
case 'n': /* newline */
putchar('\n');
break;
case 'r': /* carriage-return */
putchar('\r');
break;
case 't': /* tab */
putchar('\t');
break;
case 'v': /* vertical-tab */
putchar('\v');
break;
default:
putchar(*str);
warnx("unknown escape sequence `\\%c'", *str);
rval = 1;
}
return 1;
}
static char *
mklong(const char *str, int ch)
{
static char *copy;
static int copysize;
int len;
len = strlen(str) + 2;
if (copysize < len) {
char *newcopy;
copysize = len + 256;
newcopy = realloc(copy, copysize);
if (newcopy == NULL) {
copysize = 0;
free(copy);
copy = NULL;
return (NULL);
}
copy = newcopy;
}
(void) memmove(copy, str, len - 3);
copy[len - 3] = 'l';
copy[len - 2] = ch;
copy[len - 1] = '\0';
return (copy);
}
static int
getchr(void)
{
if (!*gargv)
return((int)'\0');
return((int)**gargv++);
}
static char *
getstr(void)
{
if (!*gargv)
return("");
return(*gargv++);
}
static char *number = "+-.0123456789";
static int
getint(void)
{
if (!*gargv)
return(0);
if (strchr(number, **gargv))
return(atoi(*gargv++));
return 0;
}
static long
getlong(void)
{
long val;
char *ep;
if (!*gargv)
return(0L);
if (**gargv == '\"' || **gargv == '\'')
return (long) *((*gargv++)+1);
errno = 0;
val = strtol (*gargv, &ep, 0);
check_conversion(*gargv++, ep);
return val;
}
static unsigned long
getulong(void)
{
unsigned long val;
char *ep;
if (!*gargv)
return(0UL);
if (**gargv == '\"' || **gargv == '\'')
return (unsigned long) *((*gargv++)+1);
errno = 0;
val = strtoul (*gargv, &ep, 0);
check_conversion(*gargv++, 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: printf format [arg ...]\n");
}