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-rw-r--r--gdbsupport/format.cc412
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diff --git a/gdbsupport/format.cc b/gdbsupport/format.cc
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+/* Parse a printf-style format string.
+
+ Copyright (C) 1986-2020 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"
+
+format_pieces::format_pieces (const char **arg, bool gdb_extensions)
+{
+ const char *s;
+ const char *string;
+ const char *prev_start;
+ const char *percent_loc;
+ char *sub_start, *current_substring;
+ enum argclass this_argclass;
+
+ s = *arg;
+
+ if (gdb_extensions)
+ {
+ string = *arg;
+ *arg += strlen (*arg);
+ }
+ else
+ {
+ /* Parse the format-control string and copy it into the string STRING,
+ processing some kinds of escape sequence. */
+
+ char *f = (char *) alloca (strlen (s) + 1);
+ string = f;
+
+ while ((gdb_extensions || *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 'e':
+ *f++ = '\e';
+ 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);
+ m_storage.reset (current_substring);
+
+ /* 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. */
+
+ const char *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 seen_size_t = 0;
+ int bad = 0;
+ int n_int_args = 0;
+ bool seen_i64 = false;
+
+ /* 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';
+
+ if (*sub_start != '\0')
+ m_pieces.emplace_back (sub_start, literal_piece, 0);
+
+ 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. */
+ if (gdb_extensions && *f == '*')
+ {
+ ++f;
+ ++n_int_args;
+ }
+ else
+ {
+ while (*f != '\0' && strchr ("0123456789", *f))
+ f++;
+ }
+
+ /* The next part of a format specifier is a precision. */
+ if (*f == '.')
+ {
+ seen_prec = 1;
+ f++;
+ if (gdb_extensions && *f == '*')
+ {
+ ++f;
+ ++n_int_args;
+ }
+ else
+ {
+ while (*f != '\0' && strchr ("0123456789", *f))
+ f++;
+ }
+ }
+
+ /* The next part of a format specifier is a length modifier. */
+ switch (*f)
+ {
+ case 'h':
+ seen_h = 1;
+ f++;
+ break;
+ case 'l':
+ f++;
+ lcount++;
+ if (*f == 'l')
+ {
+ f++;
+ lcount++;
+ }
+ break;
+ case 'L':
+ seen_big_l = 1;
+ f++;
+ break;
+ case 'H':
+ /* Decimal32 modifier. */
+ seen_big_h = 1;
+ f++;
+ break;
+ case 'D':
+ /* Decimal64 and Decimal128 modifiers. */
+ f++;
+
+ /* Check for a Decimal128. */
+ if (*f == 'D')
+ {
+ f++;
+ seen_double_big_d = 1;
+ }
+ else
+ seen_big_d = 1;
+ break;
+ case 'z':
+ /* For size_t or ssize_t. */
+ seen_size_t = 1;
+ f++;
+ break;
+ case 'I':
+ /* Support the Windows '%I64' extension, because an
+ earlier call to format_pieces might have converted %lld
+ to %I64d. */
+ if (f[1] == '6' && f[2] == '4')
+ {
+ f += 3;
+ lcount = 2;
+ seen_i64 = true;
+ }
+ break;
+ }
+
+ 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 (seen_size_t)
+ this_argclass = size_t_arg;
+ else 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;
+
+ if (gdb_extensions)
+ {
+ switch (f[1])
+ {
+ case 's':
+ case 'F':
+ case '[':
+ case ']':
+ f++;
+ break;
+ }
+ }
+
+ 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_double_big_d)
+ this_argclass = dec128float_arg;
+ else if (seen_big_d)
+ this_argclass = dec64float_arg;
+ else if (seen_big_h)
+ this_argclass = dec32float_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 && !seen_i64 && 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;
+
+ m_pieces.emplace_back (sub_start, this_argclass, n_int_args);
+ }
+
+ /* Record the remainder of the string. */
+
+ if (f > prev_start)
+ {
+ sub_start = current_substring;
+
+ strncpy (current_substring, prev_start, f - prev_start);
+ current_substring += f - prev_start;
+ *current_substring++ = '\0';
+
+ m_pieces.emplace_back (sub_start, literal_piece, 0);
+ }
+}
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