aboutsummaryrefslogtreecommitdiff
path: root/gdb/cli/cli-utils.c
blob: 5c6338b31b74d3ac0602c73809be02e8bb23d666 (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
/* CLI utilities.

   Copyright (C) 2011-2015 Free Software Foundation, Inc.

   This file is part of GDB.

   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 3 of the License, 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, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "cli/cli-utils.h"
#include "value.h"

#include <ctype.h>

/* *PP is a string denoting a number.  Get the number of the.  Advance
   *PP after the string and any trailing whitespace.

   Currently the string can either be a number, or "$" followed by the
   name of a convenience variable, or ("$" or "$$") followed by digits.

   TRAILER is a character which can be found after the number; most
   commonly this is `-'.  If you don't want a trailer, use \0.  */

static int
get_number_trailer (const char **pp, int trailer)
{
  int retval = 0;	/* default */
  const char *p = *pp;

  if (*p == '$')
    {
      struct value *val = value_from_history_ref (p, &p);

      if (val)	/* Value history reference */
	{
	  if (TYPE_CODE (value_type (val)) == TYPE_CODE_INT)
	    retval = value_as_long (val);
	  else
	    {
	      printf_filtered (_("History value must have integer type.\n"));
	      retval = 0;
	    }
	}
      else	/* Convenience variable */
	{
	  /* Internal variable.  Make a copy of the name, so we can
	     null-terminate it to pass to lookup_internalvar().  */
	  char *varname;
	  const char *start = ++p;
	  LONGEST val;

	  while (isalnum (*p) || *p == '_')
	    p++;
	  varname = (char *) alloca (p - start + 1);
	  strncpy (varname, start, p - start);
	  varname[p - start] = '\0';
	  if (get_internalvar_integer (lookup_internalvar (varname), &val))
	    retval = (int) val;
	  else
	    {
	      printf_filtered (_("Convenience variable must "
				 "have integer value.\n"));
	      retval = 0;
	    }
	}
    }
  else
    {
      if (*p == '-')
	++p;
      while (*p >= '0' && *p <= '9')
	++p;
      if (p == *pp)
	/* There is no number here.  (e.g. "cond a == b").  */
	{
	  /* Skip non-numeric token.  */
	  while (*p && !isspace((int) *p))
	    ++p;
	  /* Return zero, which caller must interpret as error.  */
	  retval = 0;
	}
      else
	retval = atoi (*pp);
    }
  if (!(isspace (*p) || *p == '\0' || *p == trailer))
    {
      /* Trailing junk: return 0 and let caller print error msg.  */
      while (!(isspace (*p) || *p == '\0' || *p == trailer))
	++p;
      retval = 0;
    }
  p = skip_spaces_const (p);
  *pp = p;
  return retval;
}

/* See documentation in cli-utils.h.  */

int
get_number_const (const char **pp)
{
  return get_number_trailer (pp, '\0');
}

/* See documentation in cli-utils.h.  */

int
get_number (char **pp)
{
  int result;
  const char *p = *pp;

  result = get_number_trailer (&p, '\0');
  *pp = (char *) p;
  return result;
}

/* See documentation in cli-utils.h.  */

void
init_number_or_range (struct get_number_or_range_state *state,
		      const char *string)
{
  memset (state, 0, sizeof (*state));
  state->string = string;
}

/* See documentation in cli-utils.h.  */

int
get_number_or_range (struct get_number_or_range_state *state)
{
  if (*state->string != '-')
    {
      /* Default case: state->string is pointing either to a solo
	 number, or to the first number of a range.  */
      state->last_retval = get_number_trailer (&state->string, '-');
      if (*state->string == '-')
	{
	  const char **temp;

	  /* This is the start of a range (<number1> - <number2>).
	     Skip the '-', parse and remember the second number,
	     and also remember the end of the final token.  */

	  temp = &state->end_ptr; 
	  state->end_ptr = skip_spaces_const (state->string + 1);
	  state->end_value = get_number_const (temp);
	  if (state->end_value < state->last_retval) 
	    {
	      error (_("inverted range"));
	    }
	  else if (state->end_value == state->last_retval)
	    {
	      /* Degenerate range (number1 == number2).  Advance the
		 token pointer so that the range will be treated as a
		 single number.  */ 
	      state->string = state->end_ptr;
	    }
	  else
	    state->in_range = 1;
	}
    }
  else if (! state->in_range)
    error (_("negative value"));
  else
    {
      /* state->string points to the '-' that betokens a range.  All
	 number-parsing has already been done.  Return the next
	 integer value (one greater than the saved previous value).
	 Do not advance the token pointer until the end of range
	 is reached.  */

      if (++state->last_retval == state->end_value)
	{
	  /* End of range reached; advance token pointer.  */
	  state->string = state->end_ptr;
	  state->in_range = 0;
	}
    }
  state->finished = *state->string == '\0';
  return state->last_retval;
}

/* Accept a number and a string-form list of numbers such as is 
   accepted by get_number_or_range.  Return TRUE if the number is
   in the list.

   By definition, an empty list includes all numbers.  This is to 
   be interpreted as typing a command such as "delete break" with 
   no arguments.  */

int
number_is_in_list (const char *list, int number)
{
  struct get_number_or_range_state state;

  if (list == NULL || *list == '\0')
    return 1;

  init_number_or_range (&state, list);
  while (!state.finished)
    {
      int gotnum = get_number_or_range (&state);

      if (gotnum == 0)
	error (_("Args must be numbers or '$' variables."));
      if (gotnum == number)
	return 1;
    }
  return 0;
}

/* See documentation in cli-utils.h.  */

char *
remove_trailing_whitespace (const char *start, char *s)
{
  while (s > start && isspace (*(s - 1)))
    --s;

  return s;
}

/* See documentation in cli-utils.h.  */

char *
extract_arg_const (const char **arg)
{
  const char *result;

  if (!*arg)
    return NULL;

  /* Find the start of the argument.  */
  *arg = skip_spaces_const (*arg);
  if (!**arg)
    return NULL;
  result = *arg;

  /* Find the end of the argument.  */
  *arg = skip_to_space_const (*arg + 1);

  if (result == *arg)
    return NULL;

  return savestring (result, *arg - result);
}

/* See documentation in cli-utils.h.  */

char *
extract_arg (char **arg)
{
  const char *arg_const = *arg;
  char *result;

  result = extract_arg_const (&arg_const);
  *arg += arg_const - *arg;
  return result;
}

/* See documentation in cli-utils.h.  */

int
check_for_argument (char **str, char *arg, int arg_len)
{
  if (strncmp (*str, arg, arg_len) == 0
      && ((*str)[arg_len] == '\0' || isspace ((*str)[arg_len])))
    {
      *str += arg_len;
      return 1;
    }
  return 0;
}