projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| f2d6dc3b KM |
1 | /* Copyright (c) 1979 Regents of the University of California */ |
| 2 | ||
| 3 | static char sccsid[] = "@(#)IOSYNC.c 1.1 %G%"; | |
| 4 | ||
| 5 | #include "h00vars.h" | |
| 6 | #include "h01errs.h" | |
| 7 | ||
| 8 | /* | |
| 9 | * insure that a usable image is in the buffer window | |
| 10 | */ | |
| 11 | IOSYNC(curfile) | |
| 12 | ||
| 13 | register struct iorec *curfile; | |
| 14 | { | |
| 15 | register short unit = curfile->funit; | |
| 16 | char *limit, *ptr; | |
| 17 | ||
| 18 | if (unit & FWRITE) { | |
| 19 | ERROR(EREADIT, curfile->pfname); | |
| 20 | return; | |
| 21 | } | |
| 22 | if ((unit & SYNC) == 0) { | |
| 23 | return; | |
| 24 | } | |
| 25 | if (unit & EOFF) { | |
| 26 | ERROR(EPASTEOF, curfile->pfname); | |
| 27 | return; | |
| 28 | } | |
| 29 | unit &= ~SYNC; | |
| 30 | fread(curfile->fileptr, curfile->fsize, 1, curfile->fbuf); | |
| 31 | if (ferror(curfile->fbuf)) { | |
| 32 | ERROR(EPASTEOF, curfile->pfname); | |
| 33 | return; | |
| 34 | } | |
| 35 | if (feof(curfile->fbuf)) { | |
| 36 | curfile->funit = unit | EOFF; | |
| 37 | limit = &curfile->fileptr[curfile->fsize]; | |
| 38 | for (ptr = curfile->fileptr; ptr < limit; ) | |
| 39 | *ptr++ = 0; | |
| 40 | return; | |
| 41 | } | |
| 42 | if (unit & FTEXT) { | |
| 43 | if (*curfile->fileptr == '\n') { | |
| 44 | unit |= EOLN; | |
| 45 | *curfile->fileptr = ' '; | |
| 46 | } else { | |
| 47 | unit &= ~EOLN; | |
| 48 | } | |
| 49 | } | |
| 50 | curfile->funit = unit; | |
| 51 | } |