Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

  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
/* #ifdef-format output routines for GNU DIFF.

   Copyright (C) 1989, 1991, 1992, 1993, 1994, 2001, 2002, 2004 Free
   Software Foundation, Inc.

   This file is part of GNU DIFF.

   GNU DIFF is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY.  No author or distributor
   accepts responsibility to anyone for the consequences of using it
   or for whether it serves any particular purpose or works at all,
   unless he says so in writing.  Refer to the GNU DIFF General Public
   License for full details.

   Everyone is granted permission to copy, modify and redistribute
   GNU DIFF, but only under the conditions described in the
   GNU DIFF General Public License.   A copy of this license is
   supposed to have been given to you along with GNU DIFF so you
   can know your rights and responsibilities.  It should be in a
   file named COPYING.  Among other things, the copyright notice
   and this notice must be preserved on all copies.  */

#include "diff.h"

#include <xalloc.h>

struct group
{
  struct file_data const *file;
  lin from, upto; /* start and limit lines for this group of lines */
};

static char const *format_group (FILE *, char const *, char,
				 struct group const *);
static char const *do_printf_spec (FILE *, char const *,
				   struct file_data const *, lin,
				   struct group const *);
static char const *scan_char_literal (char const *, char *);
static lin groups_letter_value (struct group const *, char);
static void format_ifdef (char const *, lin, lin, lin, lin);
static void print_ifdef_hunk (struct change *);
static void print_ifdef_lines (FILE *, char const *, struct group const *);

static lin next_line0;
static lin next_line1;

/* Print the edit-script SCRIPT as a merged #ifdef file.  */

void
print_ifdef_script (struct change *script)
{
  next_line0 = next_line1 = - files[0].prefix_lines;
  print_script (script, find_change, print_ifdef_hunk);
  if (next_line0 < files[0].valid_lines
      || next_line1 < files[1].valid_lines)
    {
      begin_output ();
      format_ifdef (group_format[UNCHANGED],
		    next_line0, files[0].valid_lines,
		    next_line1, files[1].valid_lines);
    }
}

/* Print a hunk of an ifdef diff.
   This is a contiguous portion of a complete edit script,
   describing changes in consecutive lines.  */

static void
print_ifdef_hunk (struct change *hunk)
{
  lin first0, last0, first1, last1;

  /* Determine range of line numbers involved in each file.  */
  enum changes changes = analyze_hunk (hunk, &first0, &last0, &first1, &last1);
  if (!changes)
    return;

  begin_output ();

  /* Print lines up to this change.  */
  if (next_line0 < first0 || next_line1 < first1)
    format_ifdef (group_format[UNCHANGED],
		  next_line0, first0,
		  next_line1, first1);

  /* Print this change.  */
  next_line0 = last0 + 1;
  next_line1 = last1 + 1;
  format_ifdef (group_format[changes],
		first0, next_line0,
		first1, next_line1);
}

/* Print a set of lines according to FORMAT.
   Lines BEG0 up to END0 are from the first file;
   lines BEG1 up to END1 are from the second file.  */

static void
format_ifdef (char const *format, lin beg0, lin end0, lin beg1, lin end1)
{
  struct group groups[2];

  groups[0].file = &files[0];
  groups[0].from = beg0;
  groups[0].upto = end0;
  groups[1].file = &files[1];
  groups[1].from = beg1;
  groups[1].upto = end1;
  format_group (outfile, format, 0, groups);
}

/* Print to file OUT a set of lines according to FORMAT.
   The format ends at the first free instance of ENDCHAR.
   Yield the address of the terminating character.
   GROUPS specifies which lines to print.
   If OUT is zero, do not actually print anything; just scan the format.  */

static char const *
format_group (register FILE *out, char const *format, char endchar,
	      struct group const *groups)
{
  register char c;
  register char const *f = format;

  while ((c = *f) != endchar && c != 0)
    {
      char const *f1 = ++f;
      if (c == '%')
	switch ((c = *f++))
	  {
	  case '%':
	    break;

	  case '(':
	    /* Print if-then-else format e.g. `%(n=1?thenpart:elsepart)'.  */
	    {
	      int i;
	      uintmax_t value[2];
	      FILE *thenout, *elseout;

	      for (i = 0; i < 2; i++)
		{
		  if (ISDIGIT (*f))
		    {
		      char *fend;
		      errno = 0;
		      value[i] = strtoumax (f, &fend, 10);
		      if (errno)
			goto bad_format;
		      f = fend;
		    }
		  else
		    {
		      value[i] = groups_letter_value (groups, *f);
		      if (value[i] == -1)
			goto bad_format;
		      f++;
		    }
		  if (*f++ != "=?"[i])
		    goto bad_format;
		}
	      if (value[0] == value[1])
		thenout = out, elseout = 0;
	      else
		thenout = 0, elseout = out;
	      f = format_group (thenout, f, ':', groups);
	      if (*f)
		{
		  f = format_group (elseout, f + 1, ')', groups);
		  if (*f)
		    f++;
		}
	    }
	    continue;

	  case '<':
	    /* Print lines deleted from first file.  */
	    print_ifdef_lines (out, line_format[OLD], &groups[0]);
	    continue;

	  case '=':
	    /* Print common lines.  */
	    print_ifdef_lines (out, line_format[UNCHANGED], &groups[0]);
	    continue;

	  case '>':
	    /* Print lines inserted from second file.  */
	    print_ifdef_lines (out, line_format[NEW], &groups[1]);
	    continue;

	  default:
	    f = do_printf_spec (out, f - 2, 0, 0, groups);
	    if (f)
	      continue;
	    /* Fall through. */
	  bad_format:
	    c = '%';
	    f = f1;
	    break;
	  }

      if (out)
	putc (c, out);
    }

  return f;
}

/* For the line group pair G, return the number corresponding to LETTER.
   Return -1 if LETTER is not a group format letter.  */
static lin
groups_letter_value (struct group const *g, char letter)
{
  switch (letter)
    {
    case 'E': letter = 'e'; g++; break;
    case 'F': letter = 'f'; g++; break;
    case 'L': letter = 'l'; g++; break;
    case 'M': letter = 'm'; g++; break;
    case 'N': letter = 'n'; g++; break;
    }

  switch (letter)
    {
      case 'e': return translate_line_number (g->file, g->from) - 1;
      case 'f': return translate_line_number (g->file, g->from);
      case 'l': return translate_line_number (g->file, g->upto) - 1;
      case 'm': return translate_line_number (g->file, g->upto);
      case 'n': return g->upto - g->from;
      default: return -1;
    }
}

/* Print to file OUT, using FORMAT to print the line group GROUP.
   But do nothing if OUT is zero.  */
static void
print_ifdef_lines (register FILE *out, char const *format,
		   struct group const *group)
{
  struct file_data const *file = group->file;
  char const * const *linbuf = file->linbuf;
  lin from = group->from, upto = group->upto;

  if (!out)
    return;

  /* If possible, use a single fwrite; it's faster.  */
  if (!expand_tabs && format[0] == '%')
    {
      if (format[1] == 'l' && format[2] == '\n' && !format[3] && from < upto)
	{
	  fwrite (linbuf[from], sizeof (char),
		  linbuf[upto] + (linbuf[upto][-1] != '\n') -  linbuf[from],
		  out);
	  return;
	}
      if (format[1] == 'L' && !format[2])
	{
	  fwrite (linbuf[from], sizeof (char),
		  linbuf[upto] -  linbuf[from], out);
	  return;
	}
    }

  for (;  from < upto;  from++)
    {
      register char c;
      register char const *f = format;

      while ((c = *f++) != 0)
	{
	  char const *f1 = f;
	  if (c == '%')
	    switch ((c = *f++))
	      {
	      case '%':
		break;

	      case 'l':
		output_1_line (linbuf[from],
			       (linbuf[from + 1]
				- (linbuf[from + 1][-1] == '\n')),
			       0, 0);
		continue;

	      case 'L':
		output_1_line (linbuf[from], linbuf[from + 1], 0, 0);
		continue;

	      default:
		f = do_printf_spec (out, f - 2, file, from, 0);
		if (f)
		  continue;
		c = '%';
		f = f1;
		break;
	      }

	  putc (c, out);
	}
    }
}

static char const *
do_printf_spec (FILE *out, char const *spec,
		struct file_data const *file, lin n,
		struct group const *groups)
{
  char const *f = spec;
  char c;
  char c1;

  /* Scan printf-style SPEC of the form %[-'0]*[0-9]*(.[0-9]*)?[cdoxX].  */
  /* assert (*f == '%'); */
  f++;
  while ((c = *f++) == '-' || c == '\'' || c == '0')
    continue;
  while (ISDIGIT (c))
    c = *f++;
  if (c == '.')
    while (ISDIGIT (c = *f++))
      continue;
  c1 = *f++;

  switch (c)
    {
    case 'c':
      if (c1 != '\'')
	return 0;
      else
	{
	  char value;
	  f = scan_char_literal (f, &value);
	  if (!f)
	    return 0;
	  if (out)
	    putc (value, out);
	}
      break;

    case 'd': case 'o': case 'x': case 'X':
      {
	lin value;

	if (file)
	  {
	    if (c1 != 'n')
	      return 0;
	    value = translate_line_number (file, n);
	  }
	else
	  {
	    value = groups_letter_value (groups, c1);
	    if (value < 0)
	      return 0;
	  }

	if (out)
	  {
	    /* For example, if the spec is "%3xn", use the printf
	       format spec "%3lx".  Here the spec prefix is "%3".  */
	    long int long_value = value;
	    size_t spec_prefix_len = f - spec - 2;
#if HAVE_C_VARARRAYS
	    char format[spec_prefix_len + 3];
#else
	    char *format = xmalloc (spec_prefix_len + 3);
#endif
	    char *p = format + spec_prefix_len;
	    memcpy (format, spec, spec_prefix_len);
	    *p++ = 'l';
	    *p++ = c;
	    *p = '\0';
	    fprintf (out, format, long_value);
#if ! HAVE_C_VARARRAYS
	    free (format);
#endif
	  }
      }
      break;

    default:
      return 0;
    }

  return f;
}

/* Scan the character literal represented in the string LIT; LIT points just
   after the initial apostrophe.  Put the literal's value into *VALPTR.
   Yield the address of the first character after the closing apostrophe,
   or zero if the literal is ill-formed.  */
static char const *
scan_char_literal (char const *lit, char *valptr)
{
  register char const *p = lit;
  char value;
  ptrdiff_t digits;
  char c = *p++;

  switch (c)
    {
      case 0:
      case '\'':
	return 0;

      case '\\':
	value = 0;
	while ((c = *p++) != '\'')
	  {
	    unsigned int digit = c - '0';
	    if (8 <= digit)
	      return 0;
	    value = 8 * value + digit;
	  }
	digits = p - lit - 2;
	if (! (1 <= digits && digits <= 3))
	  return 0;
	break;

      default:
	value = c;
	if (*p++ != '\'')
	  return 0;
	break;
    }

  *valptr = value;
  return p;
}