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https://github.com/marqs85/ossc
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89 lines
3.6 KiB
C
89 lines
3.6 KiB
C
/******************************************************************************
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* *
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* License Agreement *
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* *
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* Copyright (c) 2004 Altera Corporation, San Jose, California, USA. *
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* All rights reserved. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the "Software"), *
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* to deal in the Software without restriction, including without limitation *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
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* and/or sell copies of the Software, and to permit persons to whom the *
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* Software is furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in *
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* all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
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* DEALINGS IN THE SOFTWARE. *
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* *
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* This agreement shall be governed in all respects by the laws of the State *
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* of California and by the laws of the United States of America. *
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* *
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* Altera does not recommend, suggest or require that this reference design *
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* file be used in conjunction or combination with any other product. *
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******************************************************************************/
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include "sys/alt_dev.h"
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#include "priv/alt_file.h"
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#include "alt_types.h"
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/*
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* alt_find_dev() is used by open() in order to locate a previously registered
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* device with the name "name". The input argument "llist" is a pointer to the
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* head of the device list to search.
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*
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* The return value is a pointer to the matching device, or NULL if there is
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* no match.
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*
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* "name" must be an exact match for the devices registered name for a match to
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* be found.
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*/
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alt_dev* alt_find_dev(const char* name, alt_llist* llist)
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{
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alt_dev* next = (alt_dev*) llist->next;
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alt_32 len;
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len = strlen(name) + 1;
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/*
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* Check each list entry in turn, until a match is found, or we reach the
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* end of the list (i.e. next winds up pointing back to the list head).
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*/
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while (next != (alt_dev*) llist)
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{
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/*
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* memcmp() is used here rather than strcmp() in order to reduce the size
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* of the executable.
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*/
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if (!memcmp (next->name, name, len))
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{
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/* match found */
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return next;
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}
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next = (alt_dev*) next->llist.next;
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}
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/* No match found */
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return NULL;
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}
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