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Annotation of 43BSDReno/lib/libpc/IOSYNC.c, revision 1.1.1.1

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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