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sortix--sortix/kernel/string.cpp
2014-03-01 14:37:39 +01:00

99 lines
2.4 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
This file is part of Sortix.
Sortix 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.
Sortix 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
Sortix. If not, see <http://www.gnu.org/licenses/>.
string.cpp
Useful functions for manipulating strings that don't belong in libc.
*******************************************************************************/
#include <stdarg.h>
#include <string.h>
#include <sortix/kernel/string.h>
namespace Sortix {
namespace String {
bool StartsWith(const char* haystack, const char* needle)
{
return strncmp(haystack, needle, strlen(needle)) == 0;
}
char* Clone(const char* Input)
{
size_t InputSize = strlen(Input);
char* Result = new char[InputSize + 1];
if ( Result == NULL ) { return NULL; }
memcpy(Result, Input, InputSize + 1);
return Result;
}
char* Substring(const char* src, size_t offset, size_t length)
{
char* dest = new char[length + 1];
if ( !dest ) { return NULL; }
memcpy(dest, src + offset, length * sizeof(char));
dest[length] = 0;
return dest;
}
char* Combine(size_t NumParameters, ...)
{
va_list param_pt;
va_start(param_pt, NumParameters);
// First calculate the string length.
size_t ResultLength = 0;
const char* TMP = 0;
for ( size_t I = 0; I < NumParameters; I++ )
{
TMP = va_arg(param_pt, const char*);
if ( TMP != NULL ) { ResultLength += strlen(TMP); }
}
// Allocate a string with the desired length.
char* Result = new char[ResultLength+1];
if ( !Result ) { return NULL; }
Result[0] = 0;
va_end(param_pt);
va_start(param_pt, NumParameters);
size_t ResultOffset = 0;
for ( size_t I = 0; I < NumParameters; I++ )
{
TMP = va_arg(param_pt, const char*);
if ( TMP )
{
size_t TMPLength = strlen(TMP);
strcpy(Result + ResultOffset, TMP);
ResultOffset += TMPLength;
}
}
return Result;
}
} // namespace String
} // namespace Sortix