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307 lines
6.8 KiB
C
307 lines
6.8 KiB
C
/* CLI utilities.
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Copyright (C) 2011-2018 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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/* See documentation in cli-utils.h. */
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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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bool negative = false;
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if (*p == '-')
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{
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++p;
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negative = true;
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}
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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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const char *p1 = p;
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while (*p >= '0' && *p <= '9')
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++p;
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if (p == p1)
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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 (p1);
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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 (p);
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*pp = p;
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return negative ? -retval : 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 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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number_or_range_parser::number_or_range_parser (const char *string)
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{
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init (string);
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}
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/* See documentation in cli-utils.h. */
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void
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number_or_range_parser::init (const char *string)
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{
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m_finished = false;
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m_cur_tok = string;
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m_last_retval = 0;
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m_end_value = 0;
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m_end_ptr = NULL;
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m_in_range = false;
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}
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/* See documentation in cli-utils.h. */
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int
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number_or_range_parser::get_number ()
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{
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if (m_in_range)
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{
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/* All 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 is
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reached. */
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if (++m_last_retval == m_end_value)
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{
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/* End of range reached; advance token pointer. */
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m_cur_tok = m_end_ptr;
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m_in_range = false;
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}
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}
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else if (*m_cur_tok != '-')
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{
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/* Default case: state->m_cur_tok is pointing either to a solo
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number, or to the first number of a range. */
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m_last_retval = get_number_trailer (&m_cur_tok, '-');
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if (*m_cur_tok == '-')
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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 = &m_end_ptr;
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m_end_ptr = skip_spaces (m_cur_tok + 1);
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m_end_value = ::get_number (temp);
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if (m_end_value < m_last_retval)
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{
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error (_("inverted range"));
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}
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else if (m_end_value == m_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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m_cur_tok = m_end_ptr;
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}
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else
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m_in_range = true;
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}
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}
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else
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error (_("negative value"));
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m_finished = *m_cur_tok == '\0';
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return m_last_retval;
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}
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/* See documentation in cli-utils.h. */
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void
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number_or_range_parser::setup_range (int start_value, int end_value,
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const char *end_ptr)
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{
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gdb_assert (start_value > 0);
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m_in_range = true;
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m_end_ptr = end_ptr;
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m_last_retval = start_value - 1;
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m_end_value = end_value;
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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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if (list == NULL || *list == '\0')
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return 1;
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number_or_range_parser parser (list);
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while (!parser.finished ())
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{
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int gotnum = parser.get_number ();
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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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const char *
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remove_trailing_whitespace (const char *start, const 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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std::string
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extract_arg (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 std::string ();
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/* Find the start of the argument. */
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*arg = skip_spaces (*arg);
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if (!**arg)
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return std::string ();
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result = *arg;
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/* Find the end of the argument. */
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*arg = skip_to_space (*arg + 1);
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if (result == *arg)
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return std::string ();
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return std::string (result, *arg - result);
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}
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/* See documentation in cli-utils.h. */
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std::string
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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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std::string result;
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result = extract_arg (&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 (const char **str, const 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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