gdb/cli/cli-utils.h

   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 #ifndef CLI_UTILS_H
  21 #define CLI_UTILS_H
  22
  23 /* *PP is a string denoting a number.  Get the number of the.  Advance
  24    *PP after the string and any trailing whitespace.
  25
  26    Currently the string can either be a number,  or "$" followed by the
  27    name of a convenience variable, or ("$" or "$$") followed by digits.  */
  28
  29 extern int get_number (char **);
  30
  31 /* An object of this type is passed to get_number_or_range.  It must
  32    be initialized by calling init_number_or_range.  This type is
  33    defined here so that it can be stack-allocated, but all members
  34    other than `finished' and `string' should be treated as opaque.  */
  35
  36 struct get_number_or_range_state
  37 {
  38   /* Non-zero if parsing has completed.  */
  39   int finished;
  40
  41   /* The string being parsed.  When parsing has finished, this points
  42      past the last parsed token.  */
  43   char *string;
  44
  45   /* Last value returned.  */
  46   int last_retval;
  47
  48   /* When parsing a range, the final value in the range.  */
  49   int end_value;
  50
  51   /* When parsing a range, a pointer past the final token in the
  52      range.  */
  53   char *end_ptr;
  54
  55   /* Non-zero when parsing a range.  */
  56   int in_range;
  57 };
  58
  59 /* Initialize a get_number_or_range_state for use with
  60    get_number_or_range_state.  STRING is the string to be parsed.  */
  61
  62 extern void init_number_or_range (struct get_number_or_range_state *state,
  63                                   char *string);
  64
  65 /* Parse a number or a range.
  66    A number will be of the form handled by get_number.
  67    A range will be of the form <number1> - <number2>, and
  68    will represent all the integers between number1 and number2,
  69    inclusive.
  70
  71    While processing a range, this fuction is called iteratively;
  72    At each call it will return the next value in the range.
  73
  74    At the beginning of parsing a range, the char pointer STATE->string will
  75    be advanced past <number1> and left pointing at the '-' token.
  76    Subsequent calls will not advance the pointer until the range
  77    is completed.  The call that completes the range will advance
  78    the pointer past <number2>.  */
  79
  80 extern int get_number_or_range (struct get_number_or_range_state *state);
  81
  82 /* Accept a number and a string-form list of numbers such as is
  83    accepted by get_number_or_range.  Return TRUE if the number is
  84    in the list.
  85
  86    By definition, an empty list includes all numbers.  This is to
  87    be interpreted as typing a command such as "delete break" with
  88    no arguments.  */
  89
  90 extern int number_is_in_list (char *list, int number);
  91
  92 /* Skip leading whitespace characters in INP, returning an updated
  93    pointer.  If INP is NULL, return NULL.  */
  94
  95 extern char *skip_spaces (char *inp);
  96
  97 /* A const-correct version of the above.  */
  98
  99 extern const char *skip_spaces_const (const char *inp);
 100
 101 /* Skip leading non-whitespace characters in INP, returning an updated
 102    pointer.  If INP is NULL, return NULL.  */
 103
 104 extern char *skip_to_space (char *inp);
 105
 106 /* Reverse S to the last non-whitespace character without skipping past
 107    START.  */
 108
 109 extern char *remove_trailing_whitespace (const char *start, char *s);
 110
 111 /* A helper function to extract an argument from *ARG.  An argument is
 112    delimited by whitespace.  The return value is either NULL if no
 113    argument was found, or an xmalloc'd string.  */
 114
 115 extern char *extract_arg (char **arg);
 116
 117 /* A helper function that looks for an argument at the start of a
 118    string.  The argument must also either be at the end of the string,
 119    or be followed by whitespace.  Returns 1 if it finds the argument,
 120    0 otherwise.  If the argument is found, it updates *STR.  */
 121 extern int check_for_argument (char **str, char *arg, int arg_len);
 122
 123 #endif /* CLI_UTILS_H */