mirror of
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82 lines
2.5 KiB
C++
82 lines
2.5 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2012.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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readparamstring.cpp
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A kinda dirty hack to ease transition to the /dev/video API.
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*******************************************************************************/
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#include <errno.h>
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#include <stdarg.h>
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#include <string.h>
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#include <readparamstring.h>
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static char* Substring(const char* src, size_t offset, size_t length)
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{
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char* dest = new char[length + 1];
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if ( !dest ) { return NULL; }
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memcpy(dest, src + offset, length * sizeof(char));
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dest[length] = 0;
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return dest;
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}
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extern "C" bool ReadParamString(const char* str, ...)
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{
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if ( strchr(str, '\n') ) { errno = EINVAL; }
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const char* keyname;
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va_list args;
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while ( *str )
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{
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size_t varlen = strcspn(str, ",");
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if ( !varlen ) { str++; continue; }
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size_t namelen = strcspn(str, "=");
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if ( !namelen ) { errno = EINVAL; goto cleanup; }
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if ( !str[namelen] ) { errno = EINVAL; goto cleanup; }
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if ( varlen < namelen ) { errno = EINVAL; goto cleanup; }
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size_t valuelen = varlen - 1 /*=*/ - namelen;
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char* name = Substring(str, 0, namelen);
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if ( !name ) { goto cleanup; }
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char* value = Substring(str, namelen+1, valuelen);
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if ( !value ) { delete[] name; goto cleanup; }
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va_start(args, str);
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while ( (keyname = va_arg(args, const char*)) )
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{
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char** nameptr = va_arg(args, char**);
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if ( strcmp(keyname, name) ) { continue; }
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*nameptr = value;
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break;
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}
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va_end(args);
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if ( !keyname ) { delete[] value; }
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delete[] name;
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str += varlen;
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str += strspn(str, ",");
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}
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return true;
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cleanup:
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va_start(args, str);
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while ( (keyname = va_arg(args, const char*)) )
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{
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char** nameptr = va_arg(args, char**);
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delete[] *nameptr; *nameptr = NULL;
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}
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va_end(args);
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return false;
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}
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