binutils-gdb/gdb/cli/cli-utils.c

248 lines
6.0 KiB
C

/* 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;
}