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sortix--sortix/libmaxsi/string.cpp
Jonas 'Sortie' Termansen 728bde3bee Added strncmp(3).
2011-11-20 17:07:01 +01:00

173 lines
3.6 KiB
C++

/******************************************************************************
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
This file is part of LibMaxsi.
LibMaxsi is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
LibMaxsi 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 Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
string.cpp
Useful functions for manipulating strings.
******************************************************************************/
#include "platform.h"
#include "string.h"
#include "memory.h"
namespace Maxsi
{
namespace String
{
DUAL_FUNCTION(size_t, strlen, Length, (const char* String))
{
size_t Result = 0;
while ( String[Result] != '\0' )
{
Result++;
}
return Result;
}
DUAL_FUNCTION(char*, strcpy, Copy, (char* Dest, const char* Src))
{
char* OriginalDest = Dest;
while ( *Src != '\0' )
{
*Dest = *Src;
Dest++; Src++;
}
*Dest = '\0';
return OriginalDest;
}
DUAL_FUNCTION(char*, strcat, Cat, (char* Dest, const char* Src))
{
char* OriginalDest = Dest;
while ( *Dest != '\0' ) { Dest++; }
while ( *Src != '\0' )
{
*Dest = *Src;
Dest++; Src++;
}
*Dest = '\0';
return OriginalDest;
}
DUAL_FUNCTION(int, strcmp, Compare, (const char* A, const char* B))
{
while ( true )
{
if ( *A == '\0' && *B == '\0' ) { return 0; }
if ( *A < *B ) { return -1; }
if ( *A > *B ) { return 1; }
A++; B++;
}
}
DUAL_FUNCTION(int, strncmp, CompareN, (const char* A, const char* B, size_t MaxLength))
{
while ( MaxLength-- )
{
if ( *A == '\0' && *B == '\0' ) { return 0; }
if ( *A < *B ) { return -1; }
if ( *A > *B ) { return 1; }
A++; B++;
}
return 0;
}
bool StartsWith(const char* haystack, const char* needle)
{
return CompareN(haystack, needle, Length(needle)) == 0;
}
char* Clone(const char* Input)
{
size_t InputSize = Length(Input);
char* Result = new char[InputSize + 1];
if ( Result == NULL ) { return NULL; }
Memory::Copy(Result, Input, InputSize + 1);
return Result;
}
DUAL_FUNCTION(int, atoi, ToInt, (const char* str))
{
bool negative = ( *str == '-' );
if ( negative ) { str++; }
int result = 0;
int c;
while ( (c = *str++) != 0 )
{
if ( c < '0' || '9' < c ) { return result; }
result = result * 10 + c - '0';
}
return (negative) ? -result : result;
}
#if 0
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];
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;
}
#endif
}
}