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Annotation of 43BSDReno/lib/libpc/IOSYNC.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[] = "@(#)IOSYNC.c   1.6 (Berkeley) 4/9/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: #include "h00vars.h"
        !            25: 
        !            26: /*
        !            27:  * insure that a usable image is in the buffer window
        !            28:  */
        !            29: IOSYNC(curfile)
        !            30: 
        !            31:        register struct iorec   *curfile;
        !            32: {
        !            33:        char                    *limit, *ptr;
        !            34: 
        !            35:        if (curfile->funit & FWRITE) {
        !            36:                ERROR("%s: Attempt to read, but open for writing\n",
        !            37:                        curfile->pfname);
        !            38:                return;
        !            39:        }
        !            40:        if ((curfile->funit & SYNC) == 0) {
        !            41:                return;
        !            42:        }
        !            43:        if (curfile->funit & EOFF) {
        !            44:                ERROR("%s: Tried to read past end of file\n", curfile->pfname);
        !            45:                return;
        !            46:        }
        !            47:        curfile->funit &= ~SYNC;
        !            48:        if (curfile->funit & SPEOLN) {
        !            49:                curfile->funit &= ~(SPEOLN|EOLN);
        !            50:                curfile->funit |= EOFF;
        !            51:                return;
        !            52:        }
        !            53:        fread(curfile->fileptr, (int)curfile->fsize, 1, curfile->fbuf);
        !            54:        if (ferror(curfile->fbuf)) {
        !            55:                ERROR("%s: Tried to read past end of file\n", curfile->pfname);
        !            56:                return;
        !            57:        }
        !            58:        if (feof(curfile->fbuf)) {
        !            59:                if (curfile->funit & FTEXT) {
        !            60:                        *curfile->fileptr = ' ';
        !            61:                        if (curfile->funit & EOLN) {
        !            62:                                curfile->funit &= ~EOLN;
        !            63:                                curfile->funit |= EOFF;
        !            64:                                return;
        !            65:                        }
        !            66:                        curfile->funit |= (SPEOLN|EOLN);
        !            67:                        return;
        !            68:                }
        !            69:                curfile->funit |= EOFF;
        !            70:                limit = &curfile->fileptr[curfile->fsize];
        !            71:                for (ptr = curfile->fileptr; ptr < limit; )
        !            72:                        *ptr++ = 0;
        !            73:                return;
        !            74:        }
        !            75:        if (curfile->funit & FTEXT) {
        !            76:                if (*curfile->fileptr == '\n') {
        !            77:                        curfile->funit |= EOLN;
        !            78:                        *curfile->fileptr = ' ';
        !            79:                        return;
        !            80:                }
        !            81:                curfile->funit &= ~EOLN;
        !            82:        }
        !            83: }

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