/* CLI utilities. Copyright (c) 2011 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; } /* 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; }