| 1 | /* CLI utilities. |
| 2 | |
| 3 | Copyright (c) 2011-2012 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "cli/cli-utils.h" |
| 22 | #include "gdb_string.h" |
| 23 | #include "value.h" |
| 24 | #include "gdb_assert.h" |
| 25 | |
| 26 | #include <ctype.h> |
| 27 | |
| 28 | /* *PP is a string denoting a number. Get the number of the. Advance |
| 29 | *PP after the string and any trailing whitespace. |
| 30 | |
| 31 | Currently the string can either be a number, or "$" followed by the |
| 32 | name of a convenience variable, or ("$" or "$$") followed by digits. |
| 33 | |
| 34 | TRAILER is a character which can be found after the number; most |
| 35 | commonly this is `-'. If you don't want a trailer, use \0. */ |
| 36 | |
| 37 | static int |
| 38 | get_number_trailer (char **pp, int trailer) |
| 39 | { |
| 40 | int retval = 0; /* default */ |
| 41 | char *p = *pp; |
| 42 | |
| 43 | if (*p == '$') |
| 44 | { |
| 45 | struct value *val = value_from_history_ref (p, &p); |
| 46 | |
| 47 | if (val) /* Value history reference */ |
| 48 | { |
| 49 | if (TYPE_CODE (value_type (val)) == TYPE_CODE_INT) |
| 50 | retval = value_as_long (val); |
| 51 | else |
| 52 | { |
| 53 | printf_filtered (_("History value must have integer type.")); |
| 54 | retval = 0; |
| 55 | } |
| 56 | } |
| 57 | else /* Convenience variable */ |
| 58 | { |
| 59 | /* Internal variable. Make a copy of the name, so we can |
| 60 | null-terminate it to pass to lookup_internalvar(). */ |
| 61 | char *varname; |
| 62 | char *start = ++p; |
| 63 | LONGEST val; |
| 64 | |
| 65 | while (isalnum (*p) || *p == '_') |
| 66 | p++; |
| 67 | varname = (char *) alloca (p - start + 1); |
| 68 | strncpy (varname, start, p - start); |
| 69 | varname[p - start] = '\0'; |
| 70 | if (get_internalvar_integer (lookup_internalvar (varname), &val)) |
| 71 | retval = (int) val; |
| 72 | else |
| 73 | { |
| 74 | printf_filtered (_("Convenience variable must " |
| 75 | "have integer value.\n")); |
| 76 | retval = 0; |
| 77 | } |
| 78 | } |
| 79 | } |
| 80 | else |
| 81 | { |
| 82 | if (*p == '-') |
| 83 | ++p; |
| 84 | while (*p >= '0' && *p <= '9') |
| 85 | ++p; |
| 86 | if (p == *pp) |
| 87 | /* There is no number here. (e.g. "cond a == b"). */ |
| 88 | { |
| 89 | /* Skip non-numeric token. */ |
| 90 | while (*p && !isspace((int) *p)) |
| 91 | ++p; |
| 92 | /* Return zero, which caller must interpret as error. */ |
| 93 | retval = 0; |
| 94 | } |
| 95 | else |
| 96 | retval = atoi (*pp); |
| 97 | } |
| 98 | if (!(isspace (*p) || *p == '\0' || *p == trailer)) |
| 99 | { |
| 100 | /* Trailing junk: return 0 and let caller print error msg. */ |
| 101 | while (!(isspace (*p) || *p == '\0' || *p == trailer)) |
| 102 | ++p; |
| 103 | retval = 0; |
| 104 | } |
| 105 | p = skip_spaces (p); |
| 106 | *pp = p; |
| 107 | return retval; |
| 108 | } |
| 109 | |
| 110 | /* See documentation in cli-utils.h. */ |
| 111 | |
| 112 | int |
| 113 | get_number (char **pp) |
| 114 | { |
| 115 | return get_number_trailer (pp, '\0'); |
| 116 | } |
| 117 | |
| 118 | /* See documentation in cli-utils.h. */ |
| 119 | |
| 120 | void |
| 121 | init_number_or_range (struct get_number_or_range_state *state, |
| 122 | char *string) |
| 123 | { |
| 124 | memset (state, 0, sizeof (*state)); |
| 125 | state->string = string; |
| 126 | } |
| 127 | |
| 128 | /* See documentation in cli-utils.h. */ |
| 129 | |
| 130 | int |
| 131 | get_number_or_range (struct get_number_or_range_state *state) |
| 132 | { |
| 133 | if (*state->string != '-') |
| 134 | { |
| 135 | /* Default case: state->string is pointing either to a solo |
| 136 | number, or to the first number of a range. */ |
| 137 | state->last_retval = get_number_trailer (&state->string, '-'); |
| 138 | if (*state->string == '-') |
| 139 | { |
| 140 | char **temp; |
| 141 | |
| 142 | /* This is the start of a range (<number1> - <number2>). |
| 143 | Skip the '-', parse and remember the second number, |
| 144 | and also remember the end of the final token. */ |
| 145 | |
| 146 | temp = &state->end_ptr; |
| 147 | state->end_ptr = skip_spaces (state->string + 1); |
| 148 | state->end_value = get_number (temp); |
| 149 | if (state->end_value < state->last_retval) |
| 150 | { |
| 151 | error (_("inverted range")); |
| 152 | } |
| 153 | else if (state->end_value == state->last_retval) |
| 154 | { |
| 155 | /* Degenerate range (number1 == number2). Advance the |
| 156 | token pointer so that the range will be treated as a |
| 157 | single number. */ |
| 158 | state->string = state->end_ptr; |
| 159 | } |
| 160 | else |
| 161 | state->in_range = 1; |
| 162 | } |
| 163 | } |
| 164 | else if (! state->in_range) |
| 165 | error (_("negative value")); |
| 166 | else |
| 167 | { |
| 168 | /* state->string points to the '-' that betokens a range. All |
| 169 | number-parsing has already been done. Return the next |
| 170 | integer value (one greater than the saved previous value). |
| 171 | Do not advance the token pointer until the end of range |
| 172 | is reached. */ |
| 173 | |
| 174 | if (++state->last_retval == state->end_value) |
| 175 | { |
| 176 | /* End of range reached; advance token pointer. */ |
| 177 | state->string = state->end_ptr; |
| 178 | state->in_range = 0; |
| 179 | } |
| 180 | } |
| 181 | state->finished = *state->string == '\0'; |
| 182 | return state->last_retval; |
| 183 | } |
| 184 | |
| 185 | /* Accept a number and a string-form list of numbers such as is |
| 186 | accepted by get_number_or_range. Return TRUE if the number is |
| 187 | in the list. |
| 188 | |
| 189 | By definition, an empty list includes all numbers. This is to |
| 190 | be interpreted as typing a command such as "delete break" with |
| 191 | no arguments. */ |
| 192 | |
| 193 | int |
| 194 | number_is_in_list (char *list, int number) |
| 195 | { |
| 196 | struct get_number_or_range_state state; |
| 197 | |
| 198 | if (list == NULL || *list == '\0') |
| 199 | return 1; |
| 200 | |
| 201 | init_number_or_range (&state, list); |
| 202 | while (!state.finished) |
| 203 | { |
| 204 | int gotnum = get_number_or_range (&state); |
| 205 | |
| 206 | if (gotnum == 0) |
| 207 | error (_("Args must be numbers or '$' variables.")); |
| 208 | if (gotnum == number) |
| 209 | return 1; |
| 210 | } |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | /* See documentation in cli-utils.h. */ |
| 215 | |
| 216 | char * |
| 217 | skip_spaces (char *chp) |
| 218 | { |
| 219 | if (chp == NULL) |
| 220 | return NULL; |
| 221 | while (*chp && isspace (*chp)) |
| 222 | chp++; |
| 223 | return chp; |
| 224 | } |
| 225 | |
| 226 | /* See documentation in cli-utils.h. */ |
| 227 | |
| 228 | char * |
| 229 | skip_to_space (char *chp) |
| 230 | { |
| 231 | if (chp == NULL) |
| 232 | return NULL; |
| 233 | while (*chp && !isspace (*chp)) |
| 234 | chp++; |
| 235 | return chp; |
| 236 | } |
| 237 | |
| 238 | /* See documentation in cli-utils.h. */ |
| 239 | |
| 240 | char * |
| 241 | remove_trailing_whitespace (const char *start, char *s) |
| 242 | { |
| 243 | while (s > start && isspace (*(s - 1))) |
| 244 | --s; |
| 245 | |
| 246 | return s; |
| 247 | } |