323 lines
7.4 KiB
C
323 lines
7.4 KiB
C
/* CLI utilities.
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Copyright (C) 2011-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "cli/cli-utils.h"
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#include "value.h"
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#include <ctype.h>
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/* *PP is a string denoting a number. Get the number of the. Advance
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*PP after the string and any trailing whitespace.
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Currently the string can either be a number, or "$" followed by the
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name of a convenience variable, or ("$" or "$$") followed by digits.
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TRAILER is a character which can be found after the number; most
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commonly this is `-'. If you don't want a trailer, use \0. */
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static int
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get_number_trailer (const char **pp, int trailer)
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{
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int retval = 0; /* default */
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const char *p = *pp;
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if (*p == '$')
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{
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struct value *val = value_from_history_ref (p, &p);
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if (val) /* Value history reference */
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{
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if (TYPE_CODE (value_type (val)) == TYPE_CODE_INT)
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retval = value_as_long (val);
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else
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{
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printf_filtered (_("History value must have integer type.\n"));
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retval = 0;
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}
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}
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else /* Convenience variable */
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{
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/* Internal variable. Make a copy of the name, so we can
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null-terminate it to pass to lookup_internalvar(). */
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char *varname;
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const char *start = ++p;
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LONGEST val;
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while (isalnum (*p) || *p == '_')
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p++;
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varname = (char *) alloca (p - start + 1);
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strncpy (varname, start, p - start);
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varname[p - start] = '\0';
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if (get_internalvar_integer (lookup_internalvar (varname), &val))
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retval = (int) val;
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else
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{
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printf_filtered (_("Convenience variable must "
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"have integer value.\n"));
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retval = 0;
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}
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}
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}
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else
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{
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if (*p == '-')
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++p;
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while (*p >= '0' && *p <= '9')
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++p;
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if (p == *pp)
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/* There is no number here. (e.g. "cond a == b"). */
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{
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/* Skip non-numeric token. */
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while (*p && !isspace((int) *p))
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++p;
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/* Return zero, which caller must interpret as error. */
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retval = 0;
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}
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else
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retval = atoi (*pp);
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}
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if (!(isspace (*p) || *p == '\0' || *p == trailer))
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{
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/* Trailing junk: return 0 and let caller print error msg. */
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while (!(isspace (*p) || *p == '\0' || *p == trailer))
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++p;
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retval = 0;
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}
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p = skip_spaces_const (p);
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*pp = p;
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return retval;
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}
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/* See documentation in cli-utils.h. */
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int
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get_number_const (const char **pp)
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{
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return get_number_trailer (pp, '\0');
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}
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/* See documentation in cli-utils.h. */
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int
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get_number (char **pp)
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{
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int result;
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const char *p = *pp;
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result = get_number_trailer (&p, '\0');
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*pp = (char *) p;
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return result;
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}
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/* See documentation in cli-utils.h. */
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void
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init_number_or_range (struct get_number_or_range_state *state,
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const char *string)
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{
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memset (state, 0, sizeof (*state));
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state->string = string;
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}
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/* See documentation in cli-utils.h. */
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int
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get_number_or_range (struct get_number_or_range_state *state)
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{
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if (*state->string != '-')
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{
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/* Default case: state->string is pointing either to a solo
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number, or to the first number of a range. */
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state->last_retval = get_number_trailer (&state->string, '-');
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if (*state->string == '-')
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{
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const char **temp;
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/* This is the start of a range (<number1> - <number2>).
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Skip the '-', parse and remember the second number,
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and also remember the end of the final token. */
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temp = &state->end_ptr;
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state->end_ptr = skip_spaces_const (state->string + 1);
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state->end_value = get_number_const (temp);
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if (state->end_value < state->last_retval)
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{
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error (_("inverted range"));
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}
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else if (state->end_value == state->last_retval)
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{
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/* Degenerate range (number1 == number2). Advance the
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token pointer so that the range will be treated as a
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single number. */
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state->string = state->end_ptr;
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}
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else
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state->in_range = 1;
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}
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}
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else if (! state->in_range)
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error (_("negative value"));
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else
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{
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/* state->string points to the '-' that betokens a range. All
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number-parsing has already been done. Return the next
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integer value (one greater than the saved previous value).
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Do not advance the token pointer until the end of range
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is reached. */
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if (++state->last_retval == state->end_value)
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{
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/* End of range reached; advance token pointer. */
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state->string = state->end_ptr;
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state->in_range = 0;
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}
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}
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state->finished = *state->string == '\0';
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return state->last_retval;
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}
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/* Accept a number and a string-form list of numbers such as is
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accepted by get_number_or_range. Return TRUE if the number is
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in the list.
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By definition, an empty list includes all numbers. This is to
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be interpreted as typing a command such as "delete break" with
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no arguments. */
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int
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number_is_in_list (const char *list, int number)
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{
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struct get_number_or_range_state state;
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if (list == NULL || *list == '\0')
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return 1;
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init_number_or_range (&state, list);
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while (!state.finished)
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{
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int gotnum = get_number_or_range (&state);
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if (gotnum == 0)
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error (_("Args must be numbers or '$' variables."));
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if (gotnum == number)
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return 1;
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}
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return 0;
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}
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/* See documentation in cli-utils.h. */
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char *
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skip_spaces (char *chp)
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{
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if (chp == NULL)
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return NULL;
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while (*chp && isspace (*chp))
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chp++;
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return chp;
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}
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/* A const-correct version of the above. */
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const char *
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skip_spaces_const (const char *chp)
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{
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if (chp == NULL)
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return NULL;
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while (*chp && isspace (*chp))
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chp++;
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return chp;
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}
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/* See documentation in cli-utils.h. */
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const char *
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skip_to_space_const (const char *chp)
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{
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if (chp == NULL)
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return NULL;
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while (*chp && !isspace (*chp))
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chp++;
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return chp;
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}
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/* See documentation in cli-utils.h. */
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char *
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remove_trailing_whitespace (const char *start, char *s)
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{
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while (s > start && isspace (*(s - 1)))
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--s;
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return s;
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}
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/* See documentation in cli-utils.h. */
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char *
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extract_arg_const (const char **arg)
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{
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const char *result;
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if (!*arg)
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return NULL;
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/* Find the start of the argument. */
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*arg = skip_spaces_const (*arg);
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if (!**arg)
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return NULL;
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result = *arg;
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/* Find the end of the argument. */
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*arg = skip_to_space_const (*arg + 1);
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if (result == *arg)
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return NULL;
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return savestring (result, *arg - result);
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}
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/* See documentation in cli-utils.h. */
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char *
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extract_arg (char **arg)
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{
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const char *arg_const = *arg;
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char *result;
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result = extract_arg_const (&arg_const);
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*arg += arg_const - *arg;
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return result;
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}
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/* See documentation in cli-utils.h. */
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int
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check_for_argument (char **str, char *arg, int arg_len)
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{
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if (strncmp (*str, arg, arg_len) == 0
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&& ((*str)[arg_len] == '\0' || isspace ((*str)[arg_len])))
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{
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*str += arg_len;
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return 1;
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}
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return 0;
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}
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