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Annotation of 43BSDReno/lib/libpc/GETNAME.c, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1979 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: static char sccsid[] = "@(#)GETNAME.c  1.13 (Berkeley) 4/9/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: #include "h00vars.h"
        !            25: #include "libpc.h"
        !            26: 
        !            27: /*
        !            28:  * GETNAME - activate a file
        !            29:  *
        !            30:  * takes a name, name length, element size, and variable
        !            31:  * level and returns a pointer to a file structure.
        !            32:  *
        !            33:  * a new file structure is initialized if necessary.
        !            34:  * temporary names are generated, and given
        !            35:  * names are blank trimmed.
        !            36:  */
        !            37: 
        !            38: static char *tmpname = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
        !            39: 
        !            40: struct iorec *
        !            41: GETNAME(filep, name, namlim, datasize)
        !            42: 
        !            43:        register struct iorec   *filep;
        !            44:        char                    *name;
        !            45:        long                    namlim;
        !            46:        long                    datasize;
        !            47: {
        !            48:        int             maxnamlen = namlim;
        !            49:        struct iorec    *prev;
        !            50:        struct iorec    *next;
        !            51:        register int    cnt;
        !            52:        struct iorec    locvar;
        !            53: 
        !            54:        if (filep->fblk < MAXFILES && _actfile[filep->fblk] == filep) {
        !            55:                /* 
        !            56:                 * Close and immediately reactivate the file.
        !            57:                 */
        !            58:                PFCLOSE(filep, name != NULL);
        !            59:                _actfile[filep->fblk] = filep;
        !            60:                filep->funit &= (TEMP | FTEXT);
        !            61:        } else {
        !            62:                /*
        !            63:                 * Initialize a new file record.
        !            64:                 */
        !            65:                filep->funit = 0;
        !            66:                if (datasize == 0) {
        !            67:                        filep->funit |= FTEXT;
        !            68:                        datasize = 1;
        !            69:                }
        !            70:                filep->fsize = datasize;
        !            71:                filep->fbuf = 0;
        !            72:                filep->lcount = 0;
        !            73:                filep->llimit = 0x7fffffff;
        !            74:                filep->fileptr = &filep->window[0];
        !            75:                *filep->fname = NULL;
        !            76:                /*
        !            77:                 * Check to see if file is global, or allocated in
        !            78:                 * the stack by checking its address against the
        !            79:                 * address of one of our routine's local variables.
        !            80:                 */
        !            81:                if (filep < &locvar)
        !            82:                        filep->flev = GLVL;
        !            83:                else
        !            84:                        filep->flev = filep;
        !            85:                for (_filefre++; _filefre < MAXFILES; _filefre++)
        !            86:                        if (_actfile[_filefre] == FILNIL)
        !            87:                                goto gotone;
        !            88:                for (_filefre = PREDEF + 1; _filefre < MAXFILES; _filefre++)
        !            89:                        if (_actfile[_filefre] == FILNIL)
        !            90:                                goto gotone;
        !            91:                ERROR("File table overflow\n");
        !            92:                return;
        !            93: gotone:
        !            94:                filep->fblk = _filefre;
        !            95:                _actfile[_filefre] = filep;
        !            96:                /*
        !            97:                 * Link the new record into the file chain.
        !            98:                 */
        !            99:                prev = (struct iorec *)&_fchain;
        !           100:                next = _fchain.fchain;
        !           101:                while (filep->flev > next->flev) {
        !           102:                        prev = next;
        !           103:                        next = next->fchain;
        !           104:                }
        !           105:                if (filep->flev == GLVL)
        !           106:                        /*
        !           107:                         * Must order global files so that all dynamic files
        !           108:                         * within a record are grouped together.
        !           109:                         */
        !           110:                        while ((next != FILNIL) &&
        !           111:                               (next->flev == GLVL) &&
        !           112:                               ((struct iorec *)filep > next)) {
        !           113:                                prev = next;
        !           114:                                next = next->fchain;
        !           115:                        }
        !           116:                filep->fchain = next;
        !           117:                prev->fchain = filep;
        !           118:        }
        !           119:        /*
        !           120:         * Get the filename associated with the buffer.
        !           121:         */
        !           122:        if (name == NULL) {
        !           123:                if (*filep->fname != NULL) {
        !           124:                        return(filep);
        !           125:                }
        !           126:                /*
        !           127:                 * No name given and no previous name, so generate
        !           128:                 * a new one of the form #tmp.xxxxxx.
        !           129:                 */
        !           130:                filep->funit |= TEMP;
        !           131:                sprintf(filep->fname, "#tmp.%c%d", tmpname[filep->fblk],
        !           132:                    getpid());
        !           133:                filep->pfname = &filep->fname[0];
        !           134:                return(filep);
        !           135:        }
        !           136:        /*
        !           137:         * Trim trailing blanks, and insure that the name 
        !           138:         * will fit into the file structure.
        !           139:         */
        !           140:        for (cnt = 0; cnt < maxnamlen; cnt++)
        !           141:                if (name[cnt] == '\0' || name[cnt] == ' ')
        !           142:                        break;
        !           143:        if (cnt >= NAMSIZ) {
        !           144:                ERROR("%s: File name too long\n", name);
        !           145:                return;
        !           146:        }
        !           147:        maxnamlen = cnt;
        !           148:        filep->funit &= ~TEMP;
        !           149:        /*
        !           150:         * Put the new name into the structure.
        !           151:         */
        !           152:        for (cnt = 0; cnt < maxnamlen; cnt++)
        !           153:                filep->fname[cnt] = name[cnt];
        !           154:        filep->fname[cnt] = '\0';
        !           155:        filep->pfname = &filep->fname[0];
        !           156:        return(filep);
        !           157: }

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