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SwRI can revise these Terms at any time * without notice by updating this posting. * * Trademarks * * The SwRI logo is a trademark of SwRI in the United States and other countries. * */ #ident "@(#) $Id: locate_ex_ptr.c 18499 2007-08-01 15:31:59Z carrie $ SwRI" #include "gen_defs.h" #include "libbase_idfs.h" /****************************************************************************** * * * LOCATE_EX_PTR SUBROUTINE * * * * DESCRIPTION * * This routine checks to see if the data set requested by the user has * * already been encountered and initialized. If this combination is the * * first combination to be processed and the calling routine specified that * * memory be allocated, space is allocated for the experiment_info definition* * structure and this memory is initialized to reflect the current requested * * combination. Otherwise, if the calling routine is only verifying that the * * combination exists within the already defined combination, an error code * * is returned. If this combination is not the first combination to be * * processed, the combination was not found amongst the already defined * * combinations, and the calling routine specified that memory be allocated, * * the memory for the experiment_info structures are re-allocated in order * * to add an experiment_info structure for the new combination being * * processed. Otherwise, if the combination was not found, an error code is * * returned to the calling routine. If the combination is found amongst the * * already defined combinations, the pointers to the correct experiment_info * * structure are set. The version number allows multiple opens to the same * * IDFS data set, in which case, a unique experiment_info structure will be * * allocated for each version; that is, it is treated as a new combo to be * * processed. * * * * INPUT VARIABLES * * SDDAS_ULONG data_key key which uniquely identifies the data set * * being processed * * SDDAS_CHAR *exten the filename extension for the data file * * to be utilized * * SDDAS_USHORT vnum version number to be associated with this * * combination (allows for multiple opens) * * * * USAGE * * x = locate_ex_ptr (data_key, exten, vnum) * * * * NECESSARY SUBPROGRAMS * * None * * * * EXTERNAL VARIABLES * * struct general_info ginfo structure that holds information concern- * * ing the experiment that is being processed * * * * INTERNAL VARIABLES * * reg struct experiment_info a pointer to the structure that holds * * *ex specific experiment information * * reg struct experiment_info loop termination variable * * *stop_ex * * * * SUBSYSTEM * * Display Level * * * ******************************************************************************/ struct experiment_info * locate_ex_ptr (SDDAS_ULONG data_key, SDDAS_CHAR *exten, SDDAS_USHORT vnum) { extern struct general_info ginfo; register struct experiment_info *ex, *stop_ex; /* Find the requested combination amongst those already defined. */ ex = ginfo.exbase; stop_ex = ginfo.exbase + ginfo.nds; for (; ex < stop_ex; ++ex) { /* To speed up the code, broke up the conditional into separate parts. */ if (ex->data_key == data_key) { if (ex->version == vnum) { if (*(exten) == ex->exten[0] && (ex->exten[0] == '\0' || *(exten + 1) == ex->exten[1])) return (ex); } } } /* The combination being requested has never been defined. */ return (NO_MEMORY); }