aboutsummaryrefslogtreecommitdiff
path: root/coreutils/printf.c
blob: 5be3a67cb696340b192ecb0d9efcbcc48df23df1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
/* 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";

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;
    }
}