projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 64319a6f | 1 | /* |
| 161423a6 RE |
2 | * Copyright (c) 1980 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley software License Agreement | |
| 4 | * specifies the terms and conditions for redistribution. | |
| 64319a6f | 5 | * |
| 7784fa72 | 6 | * @(#)c_dfe.c 5.3 %G% |
| 161423a6 RE |
7 | */ |
| 8 | ||
| 9 | /* | |
| 64319a6f DL |
10 | * direct formatted external i/o - common read/write routines |
| 11 | */ | |
| 12 | ||
| 13 | #include "fio.h" | |
| 14 | ||
| 7784fa72 | 15 | c_dfe(a,flg,str) cilist *a; char *str; |
| 64319a6f DL |
16 | { int n; |
| 17 | sequential = NO; | |
| 089a8031 JB |
18 | external = YES; |
| 19 | formatted = FORMATTED; | |
| 64319a6f DL |
20 | lfname = NULL; |
| 21 | elist = NO; | |
| 22 | cursor=scale=recpos=reclen=0; | |
| 23 | radix = 10; | |
| 24 | signit = YES; | |
| 25 | fmtbuf = a->cifmt; | |
| 26 | errflag = a->cierr; | |
| 27 | endflag = a->ciend; | |
| 28 | lunit = a->ciunit; | |
| 29 | if(not_legal(lunit)) err(errflag,F_ERUNIT,str); | |
| 30 | curunit = &units[lunit]; | |
| 7784fa72 | 31 | if(!curunit->ufd && (n=fk_open(flg,DIR,FMT,(ftnint)lunit))) |
| 64319a6f DL |
32 | err(errflag,n,str) |
| 33 | cf = curunit->ufd; | |
| 34 | elist = YES; | |
| 35 | lfname = curunit->ufnm; | |
| 36 | if(!curunit->ufmt) err(errflag,F_ERNOFIO,str) | |
| 37 | if(!curunit->useek || !curunit->url) err(errflag,F_ERNODIO,str) | |
| 38 | recnum = a->cirec - 1; | |
| 39 | fseek(cf, (long)curunit->url * recnum, 0); | |
| 40 | cblank = curunit->ublnk; | |
| 41 | cplus = NO; | |
| 42 | return(OK); | |
| 43 | } | |
| 44 | ||
| 45 | y_tab() | |
| 46 | { int n; | |
| 47 | if(curunit->url==1) | |
| 48 | { | |
| 49 | if(cursor < 0 && -cursor > ftell(cf)) rewind(cf); | |
| 50 | else fseek(cf,(long)cursor,1); | |
| 51 | return(cursor=0); | |
| 52 | } | |
| 53 | else | |
| 54 | { if(reclen < recpos) reclen = recpos; | |
| 55 | if((recpos + cursor) < 0) cursor = -recpos; /* BOR */ | |
| 56 | n = reclen - recpos; /* n >= 0 */ | |
| 57 | if(!reading && (cursor-n) > 0) | |
| 58 | { recpos = reclen; | |
| 59 | cursor -= n; | |
| 60 | fseek(cf,(long)n,1); | |
| 61 | while(cursor--) if(n=(*putn)(' ')) return(n); | |
| 62 | return(cursor=0); | |
| 63 | } | |
| 64 | recpos += cursor; | |
| 65 | if(recpos >= curunit->url) err(errflag,F_EREREC,"dfe") | |
| 66 | } | |
| 67 | fseek(cf,(long)cursor,1); | |
| 68 | return(cursor=0); | |
| 69 | } |