projects / unix-history / blame
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1 | /*- |
| 2 | * Copyright (c) 1979 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| c0567266 KB |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions | |
| 7 | * are met: | |
| 8 | * 1. Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * 3. All advertising materials mentioning features or use of this software | |
| 14 | * must display the following acknowledgement: | |
| 15 | * This product includes software developed by the University of | |
| 16 | * California, Berkeley and its contributors. | |
| 17 | * 4. Neither the name of the University nor the names of its contributors | |
| 18 | * may be used to endorse or promote products derived from this software | |
| 19 | * without specific prior written permission. | |
| 20 | * | |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 31 | * SUCH DAMAGE. | |
| 0d78ca85 | 32 | */ |
| a58c9769 | 33 | |
| 0d78ca85 | 34 | #ifndef lint |
| af359dea | 35 | static char sccsid[] = "@(#)RESET.c 1.9 (Berkeley) 4/9/90"; |
| 0d78ca85 | 36 | #endif /* not lint */ |
| a58c9769 KM |
37 | |
| 38 | #include "h00vars.h" | |
| a58c9769 KM |
39 | |
| 40 | RESET(filep, name, maxnamlen, datasize) | |
| 41 | ||
| 42 | register struct iorec *filep; | |
| 43 | char *name; | |
| 492cc5d3 KM |
44 | long maxnamlen; |
| 45 | long datasize; | |
| a58c9769 KM |
46 | { |
| 47 | if (name == NULL && filep == INPUT && filep->fname[0] == '\0') { | |
| 270a57c8 | 48 | if (fseek(filep->fbuf, (long)0, 0) == -1) { |
| 86997b19 | 49 | PERROR("Could not reset ", filep->pfname); |
| a58c9769 KM |
50 | return; |
| 51 | } | |
| b56aaddc KM |
52 | filep->funit &= ~EOFF; |
| 53 | filep->funit |= (SYNC | EOLN); | |
| a58c9769 KM |
54 | return; |
| 55 | } | |
| 56 | filep = GETNAME(filep, name, maxnamlen, datasize); | |
| 57 | filep->fbuf = fopen(filep->fname, "r"); | |
| 58 | if (filep->fbuf == NULL) { | |
| 5f3d789e KM |
59 | /* |
| 60 | * This allows unnamed temp files to be opened even if | |
| 61 | * they have not been rewritten yet. We decided to remove | |
| 62 | * this feature since the standard requires that files be | |
| 63 | * defined before being reset. | |
| 64 | * | |
| a58c9769 KM |
65 | if (filep->funit & TEMP) { |
| 66 | filep->funit |= (EOFF | SYNC | FREAD); | |
| 67 | return; | |
| 68 | } | |
| 5f3d789e | 69 | */ |
| 86997b19 | 70 | PERROR("Could not open ", filep->pfname); |
| a58c9769 KM |
71 | return; |
| 72 | } | |
| 73 | filep->funit |= (SYNC | FREAD); | |
| 66cd3f19 KM |
74 | if (filep->funit & FTEXT) |
| 75 | filep->funit |= EOLN; | |
| a58c9769 KM |
76 | if (filep->fblk > PREDEF) { |
| 77 | setbuf(filep->fbuf, &filep->buf[0]); | |
| 78 | } | |
| 79 | } |