| /* CLI utilities. |
| |
| Copyright (c) 2011-2012 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 "gdb_string.h" |
| #include "value.h" |
| #include "gdb_assert.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 (char **pp, int trailer) |
| { |
| int retval = 0; /* default */ |
| 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.")); |
| 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; |
| 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 (p); |
| *pp = p; |
| return retval; |
| } |
| |
| /* See documentation in cli-utils.h. */ |
| |
| int |
| get_number (char **pp) |
| { |
| return get_number_trailer (pp, '\0'); |
| } |
| |
| /* See documentation in cli-utils.h. */ |
| |
| void |
| init_number_or_range (struct get_number_or_range_state *state, |
| 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 == '-') |
| { |
| 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 (state->string + 1); |
| state->end_value = get_number (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 (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 * |
| skip_spaces (char *chp) |
| { |
| if (chp == NULL) |
| return NULL; |
| while (*chp && isspace (*chp)) |
| chp++; |
| return chp; |
| } |
| |
| /* A const-correct version of the above. */ |
| |
| const char * |
| skip_spaces_const (const char *chp) |
| { |
| if (chp == NULL) |
| return NULL; |
| while (*chp && isspace (*chp)) |
| chp++; |
| return chp; |
| } |
| |
| /* See documentation in cli-utils.h. */ |
| |
| char * |
| skip_to_space (char *chp) |
| { |
| if (chp == NULL) |
| return NULL; |
| while (*chp && !isspace (*chp)) |
| chp++; |
| return chp; |
| } |
| |
| /* 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 (char **arg) |
| { |
| char *result, *copy; |
| |
| if (!*arg) |
| return NULL; |
| |
| /* Find the start of the argument. */ |
| *arg = skip_spaces (*arg); |
| if (!**arg) |
| return NULL; |
| result = *arg; |
| |
| /* Find the end of the argument. */ |
| *arg = skip_to_space (*arg + 1); |
| |
| if (result == *arg) |
| return NULL; |
| |
| copy = xmalloc (*arg - result + 1); |
| memcpy (copy, result, *arg - result); |
| copy[*arg - result] = '\0'; |
| |
| return copy; |
| } |
| |
| /* 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; |
| } |