printf.c - fp2-dev/platform/external/busybox - Gitiles

 /* vi: set sw=4 ts=4: */
 /* printf - format and print data
    Copyright (C) 90, 91, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2, or (at your option)
    any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software Foundation,
    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

 /* Usage: printf format [argument...]

    A front end to the printf function that lets it be used from the shell.

    Backslash escapes:

    \" = double quote
    \\ = backslash
    \a = alert (bell)
    \b = backspace
    \c = produce no further output
    \f = form feed
    \n = new line
    \r = carriage return
    \t = horizontal tab
    \v = vertical tab
    \0ooo = octal number (ooo is 0 to 3 digits)
    \xhhh = hexadecimal number (hhh is 1 to 3 digits)

    Additional directive:

    %b = print an argument string, interpreting backslash escapes

    The `format' argument is re-used as many times as necessary
    to convert all of the given arguments.

    David MacKenzie <djm@gnu.ai.mit.edu> */


 //   19990508 Busy Boxed! Dave Cinege

 #include "internal.h"
 #include <unistd.h>
 #include <stdio.h>
 #include <sys/types.h>
 #include <getopt.h>
 #include <sys/stat.h>
 #include <string.h>
 #include <errno.h>
 #include <stdlib.h>
 #include <fcntl.h>
 #include <ctype.h>
 #include <libintl.h>


 #ifndef S_IFMT
 # define S_IFMT 0170000
 #endif
 #if !defined(S_ISBLK) && defined(S_IFBLK)
 # define	S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
 #endif
 #if !defined(S_ISCHR) && defined(S_IFCHR)
 # define	S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
 #endif
 #if !defined(S_ISDIR) && defined(S_IFDIR)
 # define	S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
 #endif
 #if !defined(S_ISREG) && defined(S_IFREG)
 # define	S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
 #endif
 #if !defined(S_ISFIFO) && defined(S_IFIFO)
 # define	S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
 #endif
 #if !defined(S_ISLNK) && defined(S_IFLNK)
 # define	S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
 #endif
 #if !defined(S_ISSOCK) && defined(S_IFSOCK)
 # define	S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
 #endif
 #if !defined(S_ISMPB) && defined(S_IFMPB)	/* V7 */
 # define S_ISMPB(m) (((m) & S_IFMT) == S_IFMPB)
 # define S_ISMPC(m) (((m) & S_IFMT) == S_IFMPC)
 #endif
 #if !defined(S_ISNWK) && defined(S_IFNWK)	/* HP/UX */
 # define S_ISNWK(m) (((m) & S_IFMT) == S_IFNWK)
 #endif

 #define IN_CTYPE_DOMAIN(c) 1

 #ifdef isblank
 # define ISBLANK(c) (IN_CTYPE_DOMAIN (c) && isblank (c))
 #else
 # define ISBLANK(c) ((c) == ' ' || (c) == '\t')
 #endif
 #ifdef isgraph
 # define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isgraph (c))
 #else
 # define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isprint (c) && !isspace (c))
 #endif

 #define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))
 #define ISALNUM(c) (IN_CTYPE_DOMAIN (c) && isalnum (c))
 #define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c))
 #define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl (c))
 #define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (c))
 #define ISPUNCT(c) (IN_CTYPE_DOMAIN (c) && ispunct (c))
 #define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
 #define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c))
 #define ISXDIGIT(c) (IN_CTYPE_DOMAIN (c) && isxdigit (c))
 #define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
 #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)

 #define isodigit(c) ((c) >= '0' && (c) <= '7')
 #define hextobin(c) ((c)>='a'&&(c)<='f' ? (c)-'a'+10 : (c)>='A'&&(c)<='F' ? (c)-'A'+10 : (c)-'0')
 #define octtobin(c) ((c) - '0')

 static double xstrtod __P((char *s));
 static int print_esc __P((char *escstart));
 static int print_formatted __P((char *format, int argc, char **argv));
 static long xstrtol __P((char *s));
 static unsigned long xstrtoul __P((char *s));
 static void print_direc
 __P(

 	(char *start, size_t length, int field_width, int precision,
 	 char *argument));
 static void print_esc_char __P((int c));
 static void print_esc_string __P((char *str));
 static void verify __P((char *s, char *end));

 /* The value to return to the calling program.  */
 static int exit_status;

 static const char printf_usage[] = "printf FORMAT [ARGUMENT...]\n"
 #ifndef BB_FEATURE_TRIVIAL_HELP
 	"\nFormats and prints ARGUMENT(s) according to FORMAT,\n"
 	"Where FORMAT controls the output exactly as in C printf.\n"
 #endif
 	;

 int printf_main(int argc, char **argv)
 {
 	char *format;
 	int args_used;

 	exit_status = 0;
 	if (argc <= 1 || **(argv + 1) == '-') {
 		usage(printf_usage);
 	}

 	format = argv[1];
 	argc -= 2;
 	argv += 2;

 	do {
 		args_used = print_formatted(format, argc, argv);
 		argc -= args_used;
 		argv += args_used;
 	}
 	while (args_used > 0 && argc > 0);

 /*
   if (argc > 0)
     fprintf(stderr, "excess args ignored");
 */

 	exit(exit_status);
 }

 /* Print the text in FORMAT, using ARGV (with ARGC elements) for
    arguments to any `%' directives.
    Return the number of elements of ARGV used.  */

 static int print_formatted(char *format, int argc, char **argv)
 {
 	int save_argc = argc;		/* Preserve original value.  */
 	char *f;					/* Pointer into `format'.  */
 	char *direc_start;			/* Start of % directive.  */
 	size_t direc_length;		/* Length of % directive.  */
 	int field_width;			/* Arg to first '*', or -1 if none.  */
 	int precision;				/* Arg to second '*', or -1 if none.  */

 	for (f = format; *f; ++f) {
 		switch (*f) {
 		case '%':
 			direc_start = f++;
 			direc_length = 1;
 			field_width = precision = -1;
 			if (*f == '%') {
 				putchar('%');
 				break;
 			}
 			if (*f == 'b') {
 				if (argc > 0) {
 					print_esc_string(*argv);
 					++argv;
 					--argc;
 				}
 				break;
 			}
 			if (strchr("-+ #", *f)) {
 				++f;
 				++direc_length;
 			}
 			if (*f == '*') {
 				++f;
 				++direc_length;
 				if (argc > 0) {
 					field_width = xstrtoul(*argv);
 					++argv;
 					--argc;
 				} else
 					field_width = 0;
 			} else
 				while (ISDIGIT(*f)) {
 					++f;
 					++direc_length;
 				}
 			if (*f == '.') {
 				++f;
 				++direc_length;
 				if (*f == '*') {
 					++f;
 					++direc_length;
 					if (argc > 0) {
 						precision = xstrtoul(*argv);
 						++argv;
 						--argc;
 					} else
 						precision = 0;
 				} else
 					while (ISDIGIT(*f)) {
 						++f;
 						++direc_length;
 					}
 			}
 			if (*f == 'l' || *f == 'L' || *f == 'h') {
 				++f;
 				++direc_length;
 			}
 			/*
 			   if (!strchr ("diouxXfeEgGcs", *f))
 			   fprintf(stderr, "%%%c: invalid directive", *f);
 			 */
 			++direc_length;
 			if (argc > 0) {
 				print_direc(direc_start, direc_length, field_width,
 							precision, *argv);
 				++argv;
 				--argc;
 			} else
 				print_direc(direc_start, direc_length, field_width,
 							precision, "");
 			break;

 		case '\\':
 			f += print_esc(f);
 			break;

 		default:
 			putchar(*f);
 		}
 	}

 	return save_argc - argc;
 }

 /* Print a \ escape sequence starting at ESCSTART.
    Return the number of characters in the escape sequence
    besides the backslash. */

 static int print_esc(char *escstart)
 {
 	register char *p = escstart + 1;
 	int esc_value = 0;			/* Value of \nnn escape. */
 	int esc_length;				/* Length of \nnn escape. */

 	/* \0ooo and \xhhh escapes have maximum length of 3 chars. */
 	if (*p == 'x') {
 		for (esc_length = 0, ++p;
 			 esc_length < 3 && ISXDIGIT(*p); ++esc_length, ++p)
 			esc_value = esc_value * 16 + hextobin(*p);
 /*      if (esc_length == 0)
 	fprintf(stderr, "missing hex in esc");
 */
 		putchar(esc_value);
 	} else if (*p == '0') {
 		for (esc_length = 0, ++p;
 			 esc_length < 3 && isodigit(*p); ++esc_length, ++p)
 			esc_value = esc_value * 8 + octtobin(*p);
 		putchar(esc_value);
 	} else if (strchr("\"\\abcfnrtv", *p))
 		print_esc_char(*p++);
 /*  else
     fprintf(stderr, "\\%c: invalid esc", *p);
 */
 	return p - escstart - 1;
 }

 /* Output a single-character \ escape.  */

 static void print_esc_char(int c)
 {
 	switch (c) {
 	case 'a':					/* Alert. */
 		putchar(7);
 		break;
 	case 'b':					/* Backspace. */
 		putchar(8);
 		break;
 	case 'c':					/* Cancel the rest of the output. */
 		exit(0);
 		break;
 	case 'f':					/* Form feed. */
 		putchar(12);
 		break;
 	case 'n':					/* New line. */
 		putchar(10);
 		break;
 	case 'r':					/* Carriage return. */
 		putchar(13);
 		break;
 	case 't':					/* Horizontal tab. */
 		putchar(9);
 		break;
 	case 'v':					/* Vertical tab. */
 		putchar(11);
 		break;
 	default:
 		putchar(c);
 		break;
 	}
 }

 /* Print string STR, evaluating \ escapes. */

 static void print_esc_string(char *str)
 {
 	for (; *str; str++)
 		if (*str == '\\')
 			str += print_esc(str);
 		else
 			putchar(*str);
 }

 static void
 print_direc(char *start, size_t length, int field_width, int precision,
 			char *argument)
 {
 	char *p;					/* Null-terminated copy of % directive. */

 	p = xmalloc((unsigned) (length + 1));
 	strncpy(p, start, length);
 	p[length] = 0;

 	switch (p[length - 1]) {
 	case 'd':
 	case 'i':
 		if (field_width < 0) {
 			if (precision < 0)
 				printf(p, xstrtol(argument));
 			else
 				printf(p, precision, xstrtol(argument));
 		} else {
 			if (precision < 0)
 				printf(p, field_width, xstrtol(argument));
 			else
 				printf(p, field_width, precision, xstrtol(argument));
 		}
 		break;

 	case 'o':
 	case 'u':
 	case 'x':
 	case 'X':
 		if (field_width < 0) {
 			if (precision < 0)
 				printf(p, xstrtoul(argument));
 			else
 				printf(p, precision, xstrtoul(argument));
 		} else {
 			if (precision < 0)
 				printf(p, field_width, xstrtoul(argument));
 			else
 				printf(p, field_width, precision, xstrtoul(argument));
 		}
 		break;

 	case 'f':
 	case 'e':
 	case 'E':
 	case 'g':
 	case 'G':
 		if (field_width < 0) {
 			if (precision < 0)
 				printf(p, xstrtod(argument));
 			else
 				printf(p, precision, xstrtod(argument));
 		} else {
 			if (precision < 0)
 				printf(p, field_width, xstrtod(argument));
 			else
 				printf(p, field_width, precision, xstrtod(argument));
 		}
 		break;

 	case 'c':
 		printf(p, *argument);
 		break;

 	case 's':
 		if (field_width < 0) {
 			if (precision < 0)
 				printf(p, argument);
 			else
 				printf(p, precision, argument);
 		} else {
 			if (precision < 0)
 				printf(p, field_width, argument);
 			else
 				printf(p, field_width, precision, argument);
 		}
 		break;
 	}

 	free(p);
 }

 static unsigned long xstrtoul(char *s)
 {
 	char *end;
 	unsigned long val;

 	errno = 0;
 	val = strtoul(s, &end, 0);
 	verify(s, end);
 	return val;
 }

 static long xstrtol(char *s)
 {
 	char *end;
 	long val;

 	errno = 0;
 	val = strtol(s, &end, 0);
 	verify(s, end);
 	return val;
 }

 static double xstrtod(char *s)
 {
 	char *end;
 	double val;

 	errno = 0;
 	val = strtod(s, &end);
 	verify(s, end);
 	return val;
 }

 static void verify(char *s, char *end)
 {
 	if (errno) {
 		fprintf(stderr, "%s", s);
 		exit_status = 1;
 	} else if (*end) {
 		/*
 		   if (s == end)
 		   fprintf(stderr, "%s: expected numeric", s);
 		   else
 		   fprintf(stderr, "%s: not completely converted", s);
 		 */
 		exit_status = 1;
 	}
 }
	/* vi: set sw=4 ts=4: */
	/* printf - format and print data
	Copyright (C) 90, 91, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2, or (at your option)
	any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software Foundation,
	Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */

	/* Usage: printf format [argument...]

	A front end to the printf function that lets it be used from the shell.

	Backslash escapes:

	\" = double quote
	\\ = backslash
	\a = alert (bell)
	\b = backspace
	\c = produce no further output
	\f = form feed
	\n = new line
	\r = carriage return
	\t = horizontal tab
	\v = vertical tab
	\0ooo = octal number (ooo is 0 to 3 digits)
	\xhhh = hexadecimal number (hhh is 1 to 3 digits)

	Additional directive:

	%b = print an argument string, interpreting backslash escapes

	The `format' argument is re-used as many times as necessary
	to convert all of the given arguments.

	David MacKenzie <djm@gnu.ai.mit.edu> */


	// 19990508 Busy Boxed! Dave Cinege

	#include "internal.h"
	#include <unistd.h>
	#include <stdio.h>
	#include <sys/types.h>
	#include <getopt.h>
	#include <sys/stat.h>
	#include <string.h>
	#include <errno.h>
	#include <stdlib.h>
	#include <fcntl.h>
	#include <ctype.h>
	#include <libintl.h>


	#ifndef S_IFMT
	# define S_IFMT 0170000
	#endif
	#if !defined(S_ISBLK) && defined(S_IFBLK)
	# define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
	#endif
	#if !defined(S_ISCHR) && defined(S_IFCHR)
	# define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
	#endif
	#if !defined(S_ISDIR) && defined(S_IFDIR)
	# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
	#endif
	#if !defined(S_ISREG) && defined(S_IFREG)
	# define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
	#endif
	#if !defined(S_ISFIFO) && defined(S_IFIFO)
	# define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
	#endif
	#if !defined(S_ISLNK) && defined(S_IFLNK)
	# define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
	#endif
	#if !defined(S_ISSOCK) && defined(S_IFSOCK)
	# define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
	#endif
	#if !defined(S_ISMPB) && defined(S_IFMPB) /* V7 */
	# define S_ISMPB(m) (((m) & S_IFMT) == S_IFMPB)
	# define S_ISMPC(m) (((m) & S_IFMT) == S_IFMPC)
	#endif
	#if !defined(S_ISNWK) && defined(S_IFNWK) /* HP/UX */
	# define S_ISNWK(m) (((m) & S_IFMT) == S_IFNWK)
	#endif

	#define IN_CTYPE_DOMAIN(c) 1

	#ifdef isblank
	# define ISBLANK(c) (IN_CTYPE_DOMAIN (c) && isblank (c))
	#else
	# define ISBLANK(c) ((c) == ' ' \|\| (c) == '\t')
	#endif
	#ifdef isgraph
	# define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isgraph (c))
	#else
	# define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isprint (c) && !isspace (c))
	#endif

	#define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))
	#define ISALNUM(c) (IN_CTYPE_DOMAIN (c) && isalnum (c))
	#define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c))
	#define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl (c))
	#define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (c))
	#define ISPUNCT(c) (IN_CTYPE_DOMAIN (c) && ispunct (c))
	#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
	#define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c))
	#define ISXDIGIT(c) (IN_CTYPE_DOMAIN (c) && isxdigit (c))
	#define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
	#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)

	#define isodigit(c) ((c) >= '0' && (c) <= '7')
	#define hextobin(c) ((c)>='a'&&(c)<='f' ? (c)-'a'+10 : (c)>='A'&&(c)<='F' ? (c)-'A'+10 : (c)-'0')
	#define octtobin(c) ((c) - '0')

	static double xstrtod __P((char *s));
	static int print_esc __P((char *escstart));
	static int print_formatted __P((char format, int argc, char *argv));
	static long xstrtol __P((char *s));
	static unsigned long xstrtoul __P((char *s));
	static void print_direc
	__P(

	(char *start, size_t length, int field_width, int precision,
	char *argument));
	static void print_esc_char __P((int c));
	static void print_esc_string __P((char *str));
	static void verify __P((char s, char end));

	/* The value to return to the calling program. */
	static int exit_status;

	static const char printf_usage[] = "printf FORMAT [ARGUMENT...]\n"
	#ifndef BB_FEATURE_TRIVIAL_HELP
	"\nFormats and prints ARGUMENT(s) according to FORMAT,\n"
	"Where FORMAT controls the output exactly as in C printf.\n"
	#endif
	;

	int printf_main(int argc, char **argv)
	{
	char *format;
	int args_used;

	exit_status = 0;
	if (argc <= 1 \|\| **(argv + 1) == '-') {
	usage(printf_usage);
	}

	format = argv[1];
	argc -= 2;
	argv += 2;

	do {
	args_used = print_formatted(format, argc, argv);
	argc -= args_used;
	argv += args_used;
	}
	while (args_used > 0 && argc > 0);

	/*
	if (argc > 0)
	fprintf(stderr, "excess args ignored");
	*/

	exit(exit_status);
	}

	/* Print the text in FORMAT, using ARGV (with ARGC elements) for
	arguments to any `%' directives.
	Return the number of elements of ARGV used. */

	static int print_formatted(char format, int argc, char *argv)
	{
	int save_argc = argc; /* Preserve original value. */
	char f; / Pointer into `format'. */
	char direc_start; / Start of % directive. */
	size_t direc_length; /* Length of % directive. */
	int field_width; /* Arg to first '', or -1 if none. /
	int precision; /* Arg to second '', or -1 if none. /

	for (f = format; *f; ++f) {
	switch (*f) {
	case '%':
	direc_start = f++;
	direc_length = 1;
	field_width = precision = -1;
	if (*f == '%') {
	putchar('%');
	break;
	}
	if (*f == 'b') {
	if (argc > 0) {
	print_esc_string(*argv);
	++argv;
	--argc;
	}
	break;
	}
	if (strchr("-+ #", *f)) {
	++f;
	++direc_length;
	}
	if (f == '') {
	++f;
	++direc_length;
	if (argc > 0) {
	field_width = xstrtoul(*argv);
	++argv;
	--argc;
	} else
	field_width = 0;
	} else
	while (ISDIGIT(*f)) {
	++f;
	++direc_length;
	}
	if (*f == '.') {
	++f;
	++direc_length;
	if (f == '') {
	++f;
	++direc_length;
	if (argc > 0) {
	precision = xstrtoul(*argv);
	++argv;
	--argc;
	} else
	precision = 0;
	} else
	while (ISDIGIT(*f)) {
	++f;
	++direc_length;
	}
	}
	if (f == 'l' \|\| f == 'L' \|\| *f == 'h') {
	++f;
	++direc_length;
	}
	/*
	if (!strchr ("diouxXfeEgGcs", *f))
	fprintf(stderr, "%%%c: invalid directive", *f);
	*/
	++direc_length;
	if (argc > 0) {
	print_direc(direc_start, direc_length, field_width,
	precision, *argv);
	++argv;
	--argc;
	} else
	print_direc(direc_start, direc_length, field_width,
	precision, "");
	break;

	case '\\':
	f += print_esc(f);
	break;

	default:
	putchar(*f);
	}
	}

	return save_argc - argc;
	}

	/* Print a \ escape sequence starting at ESCSTART.
	Return the number of characters in the escape sequence
	besides the backslash. */

	static int print_esc(char *escstart)
	{
	register char *p = escstart + 1;
	int esc_value = 0; /* Value of \nnn escape. */
	int esc_length; /* Length of \nnn escape. */

	/* \0ooo and \xhhh escapes have maximum length of 3 chars. */
	if (*p == 'x') {
	for (esc_length = 0, ++p;
	esc_length < 3 && ISXDIGIT(*p); ++esc_length, ++p)
	esc_value = esc_value * 16 + hextobin(*p);
	/* if (esc_length == 0)
	fprintf(stderr, "missing hex in esc");
	*/
	putchar(esc_value);
	} else if (*p == '0') {
	for (esc_length = 0, ++p;
	esc_length < 3 && isodigit(*p); ++esc_length, ++p)
	esc_value = esc_value * 8 + octtobin(*p);
	putchar(esc_value);
	} else if (strchr("\"\\abcfnrtv", *p))
	print_esc_char(*p++);
	/* else
	fprintf(stderr, "\\%c: invalid esc", *p);
	*/
	return p - escstart - 1;
	}

	/* Output a single-character \ escape. */

	static void print_esc_char(int c)
	{
	switch (c) {
	case 'a': /* Alert. */
	putchar(7);
	break;
	case 'b': /* Backspace. */
	putchar(8);
	break;
	case 'c': /* Cancel the rest of the output. */
	exit(0);
	break;
	case 'f': /* Form feed. */
	putchar(12);
	break;
	case 'n': /* New line. */
	putchar(10);
	break;
	case 'r': /* Carriage return. */
	putchar(13);
	break;
	case 't': /* Horizontal tab. */
	putchar(9);
	break;
	case 'v': /* Vertical tab. */
	putchar(11);
	break;
	default:
	putchar(c);
	break;
	}
	}

	/* Print string STR, evaluating \ escapes. */

	static void print_esc_string(char *str)
	{
	for (; *str; str++)
	if (*str == '\\')
	str += print_esc(str);
	else
	putchar(*str);
	}

	static void
	print_direc(char *start, size_t length, int field_width, int precision,
	char *argument)
	{
	char p; / Null-terminated copy of % directive. */

	p = xmalloc((unsigned) (length + 1));
	strncpy(p, start, length);
	p[length] = 0;

	switch (p[length - 1]) {
	case 'd':
	case 'i':
	if (field_width < 0) {
	if (precision < 0)
	printf(p, xstrtol(argument));
	else
	printf(p, precision, xstrtol(argument));
	} else {
	if (precision < 0)
	printf(p, field_width, xstrtol(argument));
	else
	printf(p, field_width, precision, xstrtol(argument));
	}
	break;

	case 'o':
	case 'u':
	case 'x':
	case 'X':
	if (field_width < 0) {
	if (precision < 0)
	printf(p, xstrtoul(argument));
	else
	printf(p, precision, xstrtoul(argument));
	} else {
	if (precision < 0)
	printf(p, field_width, xstrtoul(argument));
	else
	printf(p, field_width, precision, xstrtoul(argument));
	}
	break;

	case 'f':
	case 'e':
	case 'E':
	case 'g':
	case 'G':
	if (field_width < 0) {
	if (precision < 0)
	printf(p, xstrtod(argument));
	else
	printf(p, precision, xstrtod(argument));
	} else {
	if (precision < 0)
	printf(p, field_width, xstrtod(argument));
	else
	printf(p, field_width, precision, xstrtod(argument));
	}
	break;

	case 'c':
	printf(p, *argument);
	break;

	case 's':
	if (field_width < 0) {
	if (precision < 0)
	printf(p, argument);
	else
	printf(p, precision, argument);
	} else {
	if (precision < 0)
	printf(p, field_width, argument);
	else
	printf(p, field_width, precision, argument);
	}
	break;
	}

	free(p);
	}

	static unsigned long xstrtoul(char *s)
	{
	char *end;
	unsigned long val;

	errno = 0;
	val = strtoul(s, &end, 0);
	verify(s, end);
	return val;
	}

	static long xstrtol(char *s)
	{
	char *end;
	long val;

	errno = 0;
	val = strtol(s, &end, 0);
	verify(s, end);
	return val;
	}

	static double xstrtod(char *s)
	{
	char *end;
	double val;

	errno = 0;
	val = strtod(s, &end);
	verify(s, end);
	return val;
	}

	static void verify(char s, char end)
	{
	if (errno) {
	fprintf(stderr, "%s", s);
	exit_status = 1;
	} else if (*end) {
	/*
	if (s == end)
	fprintf(stderr, "%s: expected numeric", s);
	else
	fprintf(stderr, "%s: not completely converted", s);
	*/
	exit_status = 1;
	}
	}