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binutils-gdb/gdb/common/format.c

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/* Parse a printf-style format string.
Copyright (C) 1986-2015 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 "common-defs.h"
#include "format.h"
struct format_piece *
parse_format_string (const char **arg)
{
const char *s;
char *f, *string;
const char *prev_start;
const char *percent_loc;
char *sub_start, *current_substring;
struct format_piece *pieces;
int next_frag;
int max_pieces;
enum argclass this_argclass;
s = *arg;
/* Parse the format-control string and copy it into the string STRING,
processing some kinds of escape sequence. */
f = string = (char *) alloca (strlen (s) + 1);
while (*s != '"' && *s != '\0')
{
int c = *s++;
switch (c)
{
case '\0':
continue;
case '\\':
switch (c = *s++)
{
case '\\':
*f++ = '\\';
break;
case 'a':
*f++ = '\a';
break;
case 'b':
*f++ = '\b';
break;
case 'f':
*f++ = '\f';
break;
case 'n':
*f++ = '\n';
break;
case 'r':
*f++ = '\r';
break;
case 't':
*f++ = '\t';
break;
case 'v':
*f++ = '\v';
break;
case '"':
*f++ = '"';
break;
default:
/* ??? TODO: handle other escape sequences. */
error (_("Unrecognized escape character \\%c in format string."),
c);
}
break;
default:
*f++ = c;
}
}
/* Terminate our escape-processed copy. */
*f++ = '\0';
/* Whether the format string ended with double-quote or zero, we're
done with it; it's up to callers to complain about syntax. */
*arg = s;
/* Need extra space for the '\0's. Doubling the size is sufficient. */
current_substring = (char *) xmalloc (strlen (string) * 2 + 1000);
max_pieces = strlen (string) + 2;
pieces = XNEWVEC (struct format_piece, max_pieces);
next_frag = 0;
/* Now scan the string for %-specs and see what kinds of args they want.
argclass classifies the %-specs so we can give printf-type functions
something of the right size. */
f = string;
prev_start = string;
while (*f)
if (*f++ == '%')
{
int seen_hash = 0, seen_zero = 0, lcount = 0, seen_prec = 0;
int seen_space = 0, seen_plus = 0;
int seen_big_l = 0, seen_h = 0, seen_big_h = 0;
int seen_big_d = 0, seen_double_big_d = 0;
int bad = 0;
/* Skip over "%%", it will become part of a literal piece. */
if (*f == '%')
{
f++;
continue;
}
sub_start = current_substring;
strncpy (current_substring, prev_start, f - 1 - prev_start);
current_substring += f - 1 - prev_start;
*current_substring++ = '\0';
pieces[next_frag].string = sub_start;
pieces[next_frag].argclass = literal_piece;
next_frag++;
percent_loc = f - 1;
/* Check the validity of the format specifier, and work
out what argument it expects. We only accept C89
format strings, with the exception of long long (which
we autoconf for). */
/* The first part of a format specifier is a set of flag
characters. */
while (*f != '\0' && strchr ("0-+ #", *f))
{
if (*f == '#')
seen_hash = 1;
else if (*f == '0')
seen_zero = 1;
else if (*f == ' ')
seen_space = 1;
else if (*f == '+')
seen_plus = 1;
f++;
}
/* The next part of a format specifier is a width. */
while (*f != '\0' && strchr ("0123456789", *f))
f++;
/* The next part of a format specifier is a precision. */
if (*f == '.')
{
seen_prec = 1;
f++;
while (*f != '\0' && strchr ("0123456789", *f))
f++;
}
/* The next part of a format specifier is a length modifier. */
if (*f == 'h')
{
seen_h = 1;
f++;
}
else if (*f == 'l')
{
f++;
lcount++;
if (*f == 'l')
{
f++;
lcount++;
}
}
else if (*f == 'L')
{
seen_big_l = 1;
f++;
}
/* Decimal32 modifier. */
else if (*f == 'H')
{
seen_big_h = 1;
f++;
}
/* Decimal64 and Decimal128 modifiers. */
else if (*f == 'D')
{
f++;
/* Check for a Decimal128. */
if (*f == 'D')
{
f++;
seen_double_big_d = 1;
}
else
seen_big_d = 1;
}
switch (*f)
{
case 'u':
if (seen_hash)
bad = 1;
/* FALLTHROUGH */
case 'o':
case 'x':
case 'X':
if (seen_space || seen_plus)
bad = 1;
/* FALLTHROUGH */
case 'd':
case 'i':
if (lcount == 0)
this_argclass = int_arg;
else if (lcount == 1)
this_argclass = long_arg;
else
this_argclass = long_long_arg;
if (seen_big_l)
bad = 1;
break;
case 'c':
this_argclass = lcount == 0 ? int_arg : wide_char_arg;
if (lcount > 1 || seen_h || seen_big_l)
bad = 1;
if (seen_prec || seen_zero || seen_space || seen_plus)
bad = 1;
break;
case 'p':
this_argclass = ptr_arg;
if (lcount || seen_h || seen_big_l)
bad = 1;
if (seen_prec)
bad = 1;
if (seen_hash || seen_zero || seen_space || seen_plus)
bad = 1;
break;
case 's':
this_argclass = lcount == 0 ? string_arg : wide_string_arg;
if (lcount > 1 || seen_h || seen_big_l)
bad = 1;
if (seen_zero || seen_space || seen_plus)
bad = 1;
break;
case 'e':
case 'f':
case 'g':
case 'E':
case 'G':
if (seen_big_h || seen_big_d || seen_double_big_d)
this_argclass = decfloat_arg;
else if (seen_big_l)
this_argclass = long_double_arg;
else
this_argclass = double_arg;
if (lcount || seen_h)
bad = 1;
break;
case '*':
error (_("`*' not supported for precision or width in printf"));
case 'n':
error (_("Format specifier `n' not supported in printf"));
case '\0':
error (_("Incomplete format specifier at end of format string"));
default:
error (_("Unrecognized format specifier '%c' in printf"), *f);
}
if (bad)
error (_("Inappropriate modifiers to "
"format specifier '%c' in printf"),
*f);
f++;
sub_start = current_substring;
if (lcount > 1 && USE_PRINTF_I64)
{
/* Windows' printf does support long long, but not the usual way.
Convert %lld to %I64d. */
int length_before_ll = f - percent_loc - 1 - lcount;
strncpy (current_substring, percent_loc, length_before_ll);
strcpy (current_substring + length_before_ll, "I64");
current_substring[length_before_ll + 3] =
percent_loc[length_before_ll + lcount];
current_substring += length_before_ll + 4;
}
else if (this_argclass == wide_string_arg
|| this_argclass == wide_char_arg)
{
/* Convert %ls or %lc to %s. */
int length_before_ls = f - percent_loc - 2;
strncpy (current_substring, percent_loc, length_before_ls);
strcpy (current_substring + length_before_ls, "s");
current_substring += length_before_ls + 2;
}
else
{
strncpy (current_substring, percent_loc, f - percent_loc);
current_substring += f - percent_loc;
}
*current_substring++ = '\0';
prev_start = f;
pieces[next_frag].string = sub_start;
pieces[next_frag].argclass = this_argclass;
next_frag++;
}
/* Record the remainder of the string. */
sub_start = current_substring;
strncpy (current_substring, prev_start, f - prev_start);
current_substring += f - prev_start;
*current_substring++ = '\0';
pieces[next_frag].string = sub_start;
pieces[next_frag].argclass = literal_piece;
next_frag++;
/* Record an end-of-array marker. */
pieces[next_frag].string = NULL;
pieces[next_frag].argclass = literal_piece;
return pieces;
}
void
free_format_pieces (struct format_piece *pieces)
{
if (!pieces)
return;
/* We happen to know that all the string pieces are in the block
pointed to by the first string piece. */
if (pieces[0].string)
xfree (pieces[0].string);
xfree (pieces);
}
void
free_format_pieces_cleanup (void *ptr)
{
struct format_piece **location = (struct format_piece **) ptr;
if (location == NULL)
return;
if (*location != NULL)
{
free_format_pieces (*location);
*location = NULL;
}
}
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