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sortix--sortix/libc/readparamstring.cpp
Jonas 'Sortie' Termansen 7fc1f0011a Fix libc compile warnings.
2013-07-09 20:28:55 +02:00

82 lines
2.5 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2012.
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/>.
readparamstring.cpp
A kinda dirty hack to ease transition to the /dev/video API.
*******************************************************************************/
#include <errno.h>
#include <stdarg.h>
#include <string.h>
#include <readparamstring.h>
static 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;
}
extern "C" bool ReadParamString(const char* str, ...)
{
if ( strchr(str, '\n') ) { errno = EINVAL; }
const char* keyname;
va_list args;
while ( *str )
{
size_t varlen = strcspn(str, ",");
if ( !varlen ) { str++; continue; }
size_t namelen = strcspn(str, "=");
if ( !namelen ) { errno = EINVAL; goto cleanup; }
if ( !str[namelen] ) { errno = EINVAL; goto cleanup; }
if ( varlen < namelen ) { errno = EINVAL; goto cleanup; }
size_t valuelen = varlen - 1 /*=*/ - namelen;
char* name = Substring(str, 0, namelen);
if ( !name ) { goto cleanup; }
char* value = Substring(str, namelen+1, valuelen);
if ( !value ) { delete[] name; goto cleanup; }
va_start(args, str);
while ( (keyname = va_arg(args, const char*)) )
{
char** nameptr = va_arg(args, char**);
if ( strcmp(keyname, name) ) { continue; }
*nameptr = value;
break;
}
va_end(args);
if ( !keyname ) { delete[] value; }
delete[] name;
str += varlen;
str += strspn(str, ",");
}
return true;
cleanup:
va_start(args, str);
while ( (keyname = va_arg(args, const char*)) )
{
char** nameptr = va_arg(args, char**);
delete[] *nameptr; *nameptr = NULL;
}
va_end(args);
return false;
}