| 1 | /* CLI utilities. |
| 2 | |
| 3 | Copyright (C) 2011-2017 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 "value.h" |
| 23 | |
| 24 | #include <ctype.h> |
| 25 | |
| 26 | /* See documentation in cli-utils.h. */ |
| 27 | |
| 28 | int |
| 29 | get_number_trailer (const char **pp, int trailer) |
| 30 | { |
| 31 | int retval = 0; /* default */ |
| 32 | const char *p = *pp; |
| 33 | |
| 34 | if (*p == '$') |
| 35 | { |
| 36 | struct value *val = value_from_history_ref (p, &p); |
| 37 | |
| 38 | if (val) /* Value history reference */ |
| 39 | { |
| 40 | if (TYPE_CODE (value_type (val)) == TYPE_CODE_INT) |
| 41 | retval = value_as_long (val); |
| 42 | else |
| 43 | { |
| 44 | printf_filtered (_("History value must have integer type.\n")); |
| 45 | retval = 0; |
| 46 | } |
| 47 | } |
| 48 | else /* Convenience variable */ |
| 49 | { |
| 50 | /* Internal variable. Make a copy of the name, so we can |
| 51 | null-terminate it to pass to lookup_internalvar(). */ |
| 52 | char *varname; |
| 53 | const char *start = ++p; |
| 54 | LONGEST val; |
| 55 | |
| 56 | while (isalnum (*p) || *p == '_') |
| 57 | p++; |
| 58 | varname = (char *) alloca (p - start + 1); |
| 59 | strncpy (varname, start, p - start); |
| 60 | varname[p - start] = '\0'; |
| 61 | if (get_internalvar_integer (lookup_internalvar (varname), &val)) |
| 62 | retval = (int) val; |
| 63 | else |
| 64 | { |
| 65 | printf_filtered (_("Convenience variable must " |
| 66 | "have integer value.\n")); |
| 67 | retval = 0; |
| 68 | } |
| 69 | } |
| 70 | } |
| 71 | else |
| 72 | { |
| 73 | if (*p == '-') |
| 74 | ++p; |
| 75 | while (*p >= '0' && *p <= '9') |
| 76 | ++p; |
| 77 | if (p == *pp) |
| 78 | /* There is no number here. (e.g. "cond a == b"). */ |
| 79 | { |
| 80 | /* Skip non-numeric token. */ |
| 81 | while (*p && !isspace((int) *p)) |
| 82 | ++p; |
| 83 | /* Return zero, which caller must interpret as error. */ |
| 84 | retval = 0; |
| 85 | } |
| 86 | else |
| 87 | retval = atoi (*pp); |
| 88 | } |
| 89 | if (!(isspace (*p) || *p == '\0' || *p == trailer)) |
| 90 | { |
| 91 | /* Trailing junk: return 0 and let caller print error msg. */ |
| 92 | while (!(isspace (*p) || *p == '\0' || *p == trailer)) |
| 93 | ++p; |
| 94 | retval = 0; |
| 95 | } |
| 96 | p = skip_spaces_const (p); |
| 97 | *pp = p; |
| 98 | return retval; |
| 99 | } |
| 100 | |
| 101 | /* See documentation in cli-utils.h. */ |
| 102 | |
| 103 | int |
| 104 | get_number_const (const char **pp) |
| 105 | { |
| 106 | return get_number_trailer (pp, '\0'); |
| 107 | } |
| 108 | |
| 109 | /* See documentation in cli-utils.h. */ |
| 110 | |
| 111 | int |
| 112 | get_number (char **pp) |
| 113 | { |
| 114 | int result; |
| 115 | const char *p = *pp; |
| 116 | |
| 117 | result = get_number_trailer (&p, '\0'); |
| 118 | *pp = (char *) p; |
| 119 | return result; |
| 120 | } |
| 121 | |
| 122 | /* See documentation in cli-utils.h. */ |
| 123 | |
| 124 | number_or_range_parser::number_or_range_parser (const char *string) |
| 125 | { |
| 126 | init (string); |
| 127 | } |
| 128 | |
| 129 | /* See documentation in cli-utils.h. */ |
| 130 | |
| 131 | void |
| 132 | number_or_range_parser::init (const char *string) |
| 133 | { |
| 134 | m_finished = false; |
| 135 | m_cur_tok = string; |
| 136 | m_last_retval = 0; |
| 137 | m_end_value = 0; |
| 138 | m_end_ptr = NULL; |
| 139 | m_in_range = false; |
| 140 | } |
| 141 | |
| 142 | /* See documentation in cli-utils.h. */ |
| 143 | |
| 144 | int |
| 145 | number_or_range_parser::get_number () |
| 146 | { |
| 147 | if (m_in_range) |
| 148 | { |
| 149 | /* All number-parsing has already been done. Return the next |
| 150 | integer value (one greater than the saved previous value). |
| 151 | Do not advance the token pointer until the end of range is |
| 152 | reached. */ |
| 153 | |
| 154 | if (++m_last_retval == m_end_value) |
| 155 | { |
| 156 | /* End of range reached; advance token pointer. */ |
| 157 | m_cur_tok = m_end_ptr; |
| 158 | m_in_range = false; |
| 159 | } |
| 160 | } |
| 161 | else if (*m_cur_tok != '-') |
| 162 | { |
| 163 | /* Default case: state->m_cur_tok is pointing either to a solo |
| 164 | number, or to the first number of a range. */ |
| 165 | m_last_retval = get_number_trailer (&m_cur_tok, '-'); |
| 166 | if (*m_cur_tok == '-') |
| 167 | { |
| 168 | const char **temp; |
| 169 | |
| 170 | /* This is the start of a range (<number1> - <number2>). |
| 171 | Skip the '-', parse and remember the second number, |
| 172 | and also remember the end of the final token. */ |
| 173 | |
| 174 | temp = &m_end_ptr; |
| 175 | m_end_ptr = skip_spaces_const (m_cur_tok + 1); |
| 176 | m_end_value = get_number_const (temp); |
| 177 | if (m_end_value < m_last_retval) |
| 178 | { |
| 179 | error (_("inverted range")); |
| 180 | } |
| 181 | else if (m_end_value == m_last_retval) |
| 182 | { |
| 183 | /* Degenerate range (number1 == number2). Advance the |
| 184 | token pointer so that the range will be treated as a |
| 185 | single number. */ |
| 186 | m_cur_tok = m_end_ptr; |
| 187 | } |
| 188 | else |
| 189 | m_in_range = true; |
| 190 | } |
| 191 | } |
| 192 | else |
| 193 | error (_("negative value")); |
| 194 | m_finished = *m_cur_tok == '\0'; |
| 195 | return m_last_retval; |
| 196 | } |
| 197 | |
| 198 | /* See documentation in cli-utils.h. */ |
| 199 | |
| 200 | void |
| 201 | number_or_range_parser::setup_range (int start_value, int end_value, |
| 202 | const char *end_ptr) |
| 203 | { |
| 204 | gdb_assert (start_value > 0); |
| 205 | |
| 206 | m_in_range = true; |
| 207 | m_end_ptr = end_ptr; |
| 208 | m_last_retval = start_value - 1; |
| 209 | m_end_value = end_value; |
| 210 | } |
| 211 | |
| 212 | /* Accept a number and a string-form list of numbers such as is |
| 213 | accepted by get_number_or_range. Return TRUE if the number is |
| 214 | in the list. |
| 215 | |
| 216 | By definition, an empty list includes all numbers. This is to |
| 217 | be interpreted as typing a command such as "delete break" with |
| 218 | no arguments. */ |
| 219 | |
| 220 | int |
| 221 | number_is_in_list (const char *list, int number) |
| 222 | { |
| 223 | if (list == NULL || *list == '\0') |
| 224 | return 1; |
| 225 | |
| 226 | number_or_range_parser parser (list); |
| 227 | while (!parser.finished ()) |
| 228 | { |
| 229 | int gotnum = parser.get_number (); |
| 230 | |
| 231 | if (gotnum == 0) |
| 232 | error (_("Args must be numbers or '$' variables.")); |
| 233 | if (gotnum == number) |
| 234 | return 1; |
| 235 | } |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | /* See documentation in cli-utils.h. */ |
| 240 | |
| 241 | const char * |
| 242 | remove_trailing_whitespace (const char *start, const char *s) |
| 243 | { |
| 244 | while (s > start && isspace (*(s - 1))) |
| 245 | --s; |
| 246 | |
| 247 | return s; |
| 248 | } |
| 249 | |
| 250 | /* See documentation in cli-utils.h. */ |
| 251 | |
| 252 | char * |
| 253 | extract_arg_const (const char **arg) |
| 254 | { |
| 255 | const char *result; |
| 256 | |
| 257 | if (!*arg) |
| 258 | return NULL; |
| 259 | |
| 260 | /* Find the start of the argument. */ |
| 261 | *arg = skip_spaces_const (*arg); |
| 262 | if (!**arg) |
| 263 | return NULL; |
| 264 | result = *arg; |
| 265 | |
| 266 | /* Find the end of the argument. */ |
| 267 | *arg = skip_to_space_const (*arg + 1); |
| 268 | |
| 269 | if (result == *arg) |
| 270 | return NULL; |
| 271 | |
| 272 | return savestring (result, *arg - result); |
| 273 | } |
| 274 | |
| 275 | /* See documentation in cli-utils.h. */ |
| 276 | |
| 277 | char * |
| 278 | extract_arg (char **arg) |
| 279 | { |
| 280 | const char *arg_const = *arg; |
| 281 | char *result; |
| 282 | |
| 283 | result = extract_arg_const (&arg_const); |
| 284 | *arg += arg_const - *arg; |
| 285 | return result; |
| 286 | } |
| 287 | |
| 288 | /* See documentation in cli-utils.h. */ |
| 289 | |
| 290 | int |
| 291 | check_for_argument (const char **str, const char *arg, int arg_len) |
| 292 | { |
| 293 | if (strncmp (*str, arg, arg_len) == 0 |
| 294 | && ((*str)[arg_len] == '\0' || isspace ((*str)[arg_len]))) |
| 295 | { |
| 296 | *str += arg_len; |
| 297 | return 1; |
| 298 | } |
| 299 | return 0; |
| 300 | } |