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https://sourceware.org/git/binutils-gdb.git
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87f34879e5
Makes sure that the string is longer than prefix, so that strncmp will do the right thing even if the string is not null-terminated. For use in my string_view conversion patch: https://sourceware.org/ml/gdb-patches/2019-10/msg00030.html https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/125 gdb/ChangeLog: 2019-10-28 Christian Biesinger <cbiesinger@google.com> * gdbsupport/common-utils.h (startswith): Add an overloaded version that takes gdb::string_view arguments. Change-Id: I5389855de2fd70e7065a789a79374b0693651b71
203 lines
6.5 KiB
C++
203 lines
6.5 KiB
C++
/* Shared general utility routines for GDB, the GNU debugger.
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Copyright (C) 1986-2019 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef COMMON_COMMON_UTILS_H
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#define COMMON_COMMON_UTILS_H
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#include <string>
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#include <vector>
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#include "poison.h"
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/* If possible, define FUNCTION_NAME, a macro containing the name of
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the function being defined. Since this macro may not always be
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defined, all uses must be protected by appropriate macro definition
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checks (Eg: "#ifdef FUNCTION_NAME").
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Version 2.4 and later of GCC define a magical variable `__PRETTY_FUNCTION__'
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which contains the name of the function currently being defined.
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This is broken in G++ before version 2.6.
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C9x has a similar variable called __func__, but prefer the GCC one since
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it demangles C++ function names. */
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#if (GCC_VERSION >= 2004)
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#define FUNCTION_NAME __PRETTY_FUNCTION__
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#else
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#if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
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#define FUNCTION_NAME __func__ /* ARI: func */
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#endif
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#endif
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#include "gdb_string_view.h"
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/* xmalloc(), xrealloc() and xcalloc() have already been declared in
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"libiberty.h". */
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/* Like xmalloc, but zero the memory. */
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void *xzalloc (size_t);
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template <typename T>
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static void
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xfree (T *ptr)
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{
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static_assert (IsFreeable<T>::value, "Trying to use xfree with a non-POD \
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data type. Use operator delete instead.");
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if (ptr != NULL)
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free (ptr); /* ARI: free */
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}
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/* Like asprintf and vasprintf, but return the string, throw an error
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if no memory. */
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char *xstrprintf (const char *format, ...) ATTRIBUTE_PRINTF (1, 2);
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char *xstrvprintf (const char *format, va_list ap)
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ATTRIBUTE_PRINTF (1, 0);
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/* Like snprintf, but throw an error if the output buffer is too small. */
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int xsnprintf (char *str, size_t size, const char *format, ...)
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ATTRIBUTE_PRINTF (3, 4);
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/* Returns a std::string built from a printf-style format string. */
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std::string string_printf (const char* fmt, ...)
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ATTRIBUTE_PRINTF (1, 2);
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/* Like string_printf, but takes a va_list. */
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std::string string_vprintf (const char* fmt, va_list args)
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ATTRIBUTE_PRINTF (1, 0);
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/* Like string_printf, but appends to DEST instead of returning a new
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std::string. */
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void string_appendf (std::string &dest, const char* fmt, ...)
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ATTRIBUTE_PRINTF (2, 3);
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/* Like string_appendf, but takes a va_list. */
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void string_vappendf (std::string &dest, const char* fmt, va_list args)
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ATTRIBUTE_PRINTF (2, 0);
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/* Make a copy of the string at PTR with LEN characters
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(and add a null character at the end in the copy).
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Uses malloc to get the space. Returns the address of the copy. */
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char *savestring (const char *ptr, size_t len);
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/* Extract the next word from ARG. The next word is defined as either,
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everything up to the next space, or, if the next word starts with either
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a single or double quote, then everything up to the closing quote. The
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enclosing quotes are not returned in the result string. The pointer in
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ARG is updated to point to the first character after the end of the
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word, or, for quoted words, the first character after the closing
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quote. */
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std::string extract_string_maybe_quoted (const char **arg);
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/* The strerror() function can return NULL for errno values that are
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out of range. Provide a "safe" version that always returns a
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printable string. */
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extern char *safe_strerror (int);
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/* Return true if the start of STRING matches PATTERN, false otherwise. */
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static inline bool
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startswith (const char *string, const char *pattern)
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{
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return strncmp (string, pattern, strlen (pattern)) == 0;
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}
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/* Version of startswith that takes string_view arguments. See comment
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above. */
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static inline bool
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startswith (gdb::string_view string, gdb::string_view pattern)
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{
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return (string.length () >= pattern.length ()
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&& strncmp (string.data (), pattern.data (), pattern.length ()) == 0);
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}
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ULONGEST strtoulst (const char *num, const char **trailer, int base);
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/* Skip leading whitespace characters in INP, returning an updated
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pointer. If INP is NULL, return NULL. */
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extern char *skip_spaces (char *inp);
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/* A const-correct version of the above. */
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extern const char *skip_spaces (const char *inp);
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/* Skip leading non-whitespace characters in INP, returning an updated
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pointer. If INP is NULL, return NULL. */
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extern char *skip_to_space (char *inp);
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/* A const-correct version of the above. */
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extern const char *skip_to_space (const char *inp);
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/* Assumes that V is an argv for a program, and iterates through
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freeing all the elements. */
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extern void free_vector_argv (std::vector<char *> &v);
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/* Given a vector of arguments ARGV, return a string equivalent to
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joining all the arguments with a whitespace separating them. */
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extern std::string stringify_argv (const std::vector<char *> &argv);
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/* Return true if VALUE is in [LOW, HIGH]. */
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template <typename T>
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static bool
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in_inclusive_range (T value, T low, T high)
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{
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return value >= low && value <= high;
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}
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/* Ensure that V is aligned to an N byte boundary (B's assumed to be a
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power of 2). Round up/down when necessary. Examples of correct
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use include:
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addr = align_up (addr, 8); -- VALUE needs 8 byte alignment
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write_memory (addr, value, len);
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addr += len;
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and:
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sp = align_down (sp - len, 16); -- Keep SP 16 byte aligned
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write_memory (sp, value, len);
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Note that uses such as:
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write_memory (addr, value, len);
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addr += align_up (len, 8);
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and:
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sp -= align_up (len, 8);
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write_memory (sp, value, len);
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are typically not correct as they don't ensure that the address (SP
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or ADDR) is correctly aligned (relying on previous alignment to
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keep things right). This is also why the methods are called
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"align_..." instead of "round_..." as the latter reads better with
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this incorrect coding style. */
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extern ULONGEST align_up (ULONGEST v, int n);
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extern ULONGEST align_down (ULONGEST v, int n);
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#endif /* COMMON_COMMON_UTILS_H */
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