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sortix--sortix/libc/string/stresep.cpp
Jonas 'Sortie' Termansen 5c702ed44b Add stresep(3).
2014-11-27 21:01:13 +01:00

63 lines
1.8 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2014.
This file is part of the Sortix C Library.
The Sortix C Library 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.
The Sortix C Library 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 the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
string/stresep.cpp
Extract a token from a string while handling escape characters.
*******************************************************************************/
#include <string.h>
extern "C" char* stresep(char** string_ptr, const char* delim, int escape)
{
char* token = *string_ptr;
if ( !token )
return NULL;
size_t consumed_length = 0;
size_t token_length = 0;
bool escaped = false;
while ( true )
{
char c = token[consumed_length++];
bool true_nul = c == '\0';
if ( !escaped && escape && (unsigned char) c == (unsigned char) escape )
{
escaped = true;
continue;
}
if ( !escaped && c != '\0' )
{
for ( size_t i = 0; delim[i]; i++ )
{
if ( c != delim[i] )
{
c = '\0';
break;
}
}
}
token[token_length++] = c;
escaped = false;
if ( c == '\0' )
{
*string_ptr = true_nul ? (char*) NULL : token + consumed_length;
return token;
}
}
}