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1a2d75fd72
busybox/coreutils/printf.c
Eric Andersen 6c0e0fb8ac Fix a stupid bug I introduced several months ago
2003-08-08 07:39:57 +00:00

453 lines
10 KiB
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/* 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 <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <ctype.h>
#include <assert.h>
#include "busybox.h"
#ifndef S_IFMT
static const int 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
#define ISXDIGIT(c) (IN_CTYPE_DOMAIN (c) && isxdigit (c))
#define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
#define ISDIGIT(c) (((unsigned char) (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));
/* The value to return to the calling program. */
static int exit_status;
int printf_main(int argc, char **argv)
{
char *format;
int args_used;
exit_status = 0;
if (argc <= 1 || **(argv + 1) == '-') {
bb_show_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");
*/
return(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 *arg)
{
unsigned long result;
char *endptr;
//int errno_save = errno;
assert(arg!=NULL);
errno = 0;
result = strtoul(arg, &endptr, 0);
if (errno != 0 || *endptr!='\0' || endptr==arg)
fprintf(stderr, "%s", arg);
//errno = errno_save;
return result;
}
static long xstrtol(char *arg)
{
long result;
char *endptr;
//int errno_save = errno;
assert(arg!=NULL);
errno = 0;
result = strtoul(arg, &endptr, 0);
if (errno != 0 || *endptr!='\0' || endptr==arg)
fprintf(stderr, "%s", arg);
//errno = errno_save;
return result;
}
static double xstrtod(char *arg)
{
double result;
char *endptr;
//int errno_save = errno;
assert(arg!=NULL);
errno = 0;
result = strtod(arg, &endptr);
if (errno != 0 || *endptr!='\0' || endptr==arg)
fprintf(stderr, "%s", arg);
//errno = errno_save;
return result;
}
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