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busybox/printf.c
Eric Andersen b0e9a709ba More stuff. 
-Erik
1999-10-18 22:28:26 +00:00

530 lines
11 KiB
C
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/* 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')
char *xmalloc ();
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;
const char printf_usage[] = "printf format [argument...]\n";
int
printf_main(int argc, char** argv)
{
char *format;
int args_used;
exit_status = 0;
if ( **(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;
}
}
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