| 1 | /*!
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| 2 | \file open.cc
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| 3 | \ingroup (PSIO)
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| 4 | */
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| 5 |
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| 6 | #include <sys/types.h>
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| 7 | #include <sys/stat.h>
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| 8 | #include <fcntl.h>
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| 9 | #include <string.h>
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| 10 | #include <stdlib.h>
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| 11 | #include <unistd.h>
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| 12 | #include <util/psi3/libpsio/psio.h>
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| 13 |
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| 14 | namespace psi3 {
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| 15 | namespace libpsio {
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| 16 |
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| 17 | /*!
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| 18 | ** PSIO_OPEN(): Opens a multivolume PSI direct access file for
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| 19 | ** reading/writing data.
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| 20 | **
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| 21 | ** \param unit = The PSI unit number used to identify the file to all
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| 22 | ** read and write functions.
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| 23 | ** \param status = Indicates if the file is old (PSIO_OPEN_OLD) or new
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| 24 | ** (PSIO_OPEN_NEW).
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| 25 | **
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| 26 | ** \ingroup (PSIO)
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| 27 | */
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| 28 |
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| 29 | int psio_open(unsigned int unit, int status)
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| 30 | {
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| 31 | unsigned int i, j;
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| 32 | int errcod, stream, tocstat;
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| 33 | char name[PSIO_MAXSTR],path[PSIO_MAXSTR],fullpath[PSIO_MAXSTR];
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| 34 | psio_ud *this_unit;
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| 35 |
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| 36 | this_unit = &(psio_unit[unit]);
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| 37 |
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| 38 | /* First check to see if this unit is aleady open */
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| 39 | if(this_unit->vol[0].stream != -1) psio_error(unit,PSIO_ERROR_REOPEN);
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| 40 |
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| 41 | /* Get number of volumes to stripe across */
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| 42 | this_unit->numvols = psio_get_numvols(unit);
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| 43 | if(this_unit->numvols > PSIO_MAXVOL) psio_error(unit,PSIO_ERROR_MAXVOL);
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| 44 |
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| 45 | if(!(this_unit->numvols)) this_unit->numvols = 1;
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| 46 |
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| 47 | /* Get the file name prefix */
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| 48 | errcod = psio_get_filename(unit,name);
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| 49 |
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| 50 | /* Build the name for each volume and open the file */
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| 51 | for(i=0; i < this_unit->numvols; i++) {
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| 52 | errcod = psio_get_volpath(unit, i, path);
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| 53 |
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| 54 | if(errcod && this_unit->numvols > 1)
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| 55 | psio_error(unit,PSIO_ERROR_NOVOLPATH);
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| 56 |
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| 57 | sprintf(fullpath, "%s%s.%u", path, name, unit);
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| 58 | this_unit->vol[i].path = (char *) malloc(strlen(fullpath)+1);
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| 59 | strcpy(this_unit->vol[i].path,fullpath);
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| 60 |
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| 61 | /* Check if any previously opened volumes have the same path */
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| 62 | for(j=0; j < i; j++)
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| 63 | if (!strcmp(this_unit->vol[i].path,this_unit->vol[j].path))
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| 64 | psio_error(unit,PSIO_ERROR_IDENTVOLPATH);
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| 65 |
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| 66 | /* Now open the volume */
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| 67 | if(status == PSIO_OPEN_OLD) {
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| 68 | this_unit->vol[i].stream =
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| 69 | open(this_unit->vol[i].path,O_CREAT|O_RDWR,0644);
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| 70 | if(this_unit->vol[i].stream == -1)
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| 71 | psio_error(unit,PSIO_ERROR_OPEN);
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| 72 | }
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| 73 | else if(status == PSIO_OPEN_NEW) {
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| 74 | this_unit->vol[i].stream =
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| 75 | open(this_unit->vol[i].path,O_CREAT|O_RDWR|O_TRUNC,0644);
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| 76 | if(this_unit->vol[i].stream == -1)
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| 77 | psio_error(unit,PSIO_ERROR_OPEN);
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| 78 | }
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| 79 | else psio_error(unit,PSIO_ERROR_OSTAT);
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| 80 | }
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| 81 |
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| 82 | if (status == PSIO_OPEN_OLD) tocstat = psio_tocread(unit);
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| 83 | else if (status == PSIO_OPEN_NEW) {
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| 84 |
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| 85 | /* Init the TOC stats and write them to disk */
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| 86 | this_unit->tocaddress.page = 0;
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| 87 | this_unit->tocaddress.offset = 3*sizeof(ULI);
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| 88 | this_unit->toclen = 0;
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| 89 | this_unit->toc = NULL;
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| 90 |
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| 91 | /* Seek vol[0] to its beginning */
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| 92 | stream = this_unit->vol[0].stream;
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| 93 | errcod = lseek(stream, 0L, SEEK_SET);
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| 94 | if(errcod == -1) psio_error(unit,PSIO_ERROR_LSEEK);
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| 95 |
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| 96 | errcod = write(stream, (char *) &(this_unit->tocaddress.page),
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| 97 | sizeof(ULI));
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| 98 | if(errcod != sizeof(ULI)) psio_error(unit,PSIO_ERROR_WRITE);
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| 99 | errcod = write(stream, (char *) &(this_unit->tocaddress.offset),
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| 100 | sizeof(ULI));
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| 101 | if(errcod != sizeof(ULI)) psio_error(unit,PSIO_ERROR_WRITE);
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| 102 | errcod = write(stream, (char *) &(this_unit->toclen), sizeof(ULI));
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| 103 | if(errcod != sizeof(ULI)) psio_error(unit,PSIO_ERROR_WRITE);
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| 104 |
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| 105 | }
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| 106 | else psio_error(unit,PSIO_ERROR_OSTAT);
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| 107 |
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| 108 | return(0);
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| 109 | }
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| 110 |
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| 111 | }
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| 112 | }
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