path: root/src/util/StringUtil.cxx

/*
 * Copyright (C) 2003-2015 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * 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 2 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "StringUtil.hxx"
#include "StringAPI.hxx"
#include "CharUtil.hxx"
#include "ASCII.hxx"

#include <algorithm>

#include <assert.h>
#include <string.h>

bool
StringStartsWith(const char *haystack, const char *needle)
{
	const size_t length = strlen(needle);
	return memcmp(haystack, needle, length) == 0;
}

bool
StringEndsWith(const char *haystack, const char *needle)
{
	const size_t haystack_length = strlen(haystack);
	const size_t needle_length = strlen(needle);

	return haystack_length >= needle_length &&
		memcmp(haystack + haystack_length - needle_length,
		       needle, needle_length) == 0;
}

const char *
StringAfterPrefix(const char *string, const char *prefix)
{
#if !CLANG_CHECK_VERSION(3,6)
	/* disabled on clang due to -Wtautological-pointer-compare */
	assert(string != nullptr);
	assert(prefix != nullptr);
#endif

	size_t prefix_length = strlen(prefix);
	return StringIsEqual(string, prefix, prefix_length)
		? string + prefix_length
		: nullptr;
}

const char *
FindStringSuffix(const char *p, const char *suffix)
{
	const size_t p_length = strlen(p);
	const size_t suffix_length = strlen(suffix);

	if (p_length < suffix_length)
		return nullptr;

	const char *q = p + p_length - suffix_length;
	return memcmp(q, suffix, suffix_length) == 0
		? q
		: nullptr;
}

char *
CopyString(char *gcc_restrict dest, const char *gcc_restrict src, size_t size)
{
	size_t length = strlen(src);
	if (length >= size)
		length = size - 1;

	char *p = std::copy_n(src, length, dest);
	*p = '\0';
	return p;
}

const char *
StripLeft(const char *p)
{
	while (IsWhitespaceNotNull(*p))
		++p;

	return p;
}

const char *
StripLeft(const char *p, const char *end)
{
	while (p < end && IsWhitespaceOrNull(*p))
		++p;

	return p;
}

const char *
StripRight(const char *p, const char *end)
{
	while (end > p && IsWhitespaceOrNull(end[-1]))
		--end;

	return end;
}

size_t
StripRight(const char *p, size_t length)
{
	while (length > 0 && IsWhitespaceOrNull(p[length - 1]))
		--length;

	return length;
}

void
StripRight(char *p)
{
	size_t old_length = strlen(p);
	size_t new_length = StripRight(p, old_length);
	p[new_length] = 0;
}

char *
Strip(char *p)
{
	p = StripLeft(p);
	StripRight(p);
	return p;
}

bool
string_array_contains(const char *const* haystack, const char *needle)
{
	assert(haystack != nullptr);
	assert(needle != nullptr);

	for (; *haystack != nullptr; ++haystack)
		if (StringEqualsCaseASCII(*haystack, needle))
			return true;

	return false;
}

void
ToUpperASCII(char *dest, const char *src, size_t size)
{
	assert(dest != nullptr);
	assert(src != nullptr);
	assert(size > 1);

	char *const end = dest + size - 1;

	do {
		char ch = *src++;
		if (ch == 0)
			break;

		*dest++ = ToUpperASCII(ch);
	} while (dest < end);

	*dest = 0;
}