4.3BSD - /usr/src/bin/sh/io.c

   1: #ifndef lint
   2: static char sccsid[] = "@(#)io.c	4.3 3/19/85";
   3: #endif
   4: 
   5: #
   6: /*
   7:  * UNIX shell
   8:  *
   9:  * S. R. Bourne
  10:  * Bell Telephone Laboratories
  11:  *
  12:  */
  13: 
  14: #include    "defs.h"
  15: 
  16: 
  17: /* ========	input output and file copying ======== */
  18: 
  19: initf(fd)
  20:     UFD     fd;
  21: {
  22:     REG FILE    f=standin;
  23: 
  24:     f->fdes=fd; f->fsiz=((flags&(oneflg|ttyflg))==0 ? BUFSIZ : 1);
  25:     f->fnxt=f->fend=f->fbuf; f->feval=0; f->flin=1;
  26:     f->feof=FALSE;
  27: }
  28: 
  29: estabf(s)
  30:     REG STRING  s;
  31: {
  32:     REG FILE    f;
  33: 
  34:     (f=standin)->fdes = -1;
  35:     f->fend=length(s)+(f->fnxt=s);
  36:     f->flin=1;
  37:     return(f->feof=(s==0));
  38: }
  39: 
  40: push(af)
  41:     FILE        af;
  42: {
  43:     REG FILE    f;
  44: 
  45:     (f=af)->fstak=standin;
  46:     f->feof=0; f->feval=0;
  47:     standin=f;
  48: }
  49: 
  50: pop()
  51: {
  52:     REG FILE    f;
  53: 
  54:     IF (f=standin)->fstak
  55:     THEN    IF f->fdes>=0 THEN close(f->fdes) FI
  56:         standin=f->fstak;
  57:         return(TRUE);
  58:     ELSE    return(FALSE);
  59:     FI
  60: }
  61: 
  62: chkpipe(pv)
  63:     INT     *pv;
  64: {
  65:     IF pipe(pv)<0 ORF pv[INPIPE]<0 ORF pv[OTPIPE]<0
  66:     THEN    error(piperr);
  67:     FI
  68: }
  69: 
  70: chkopen(idf)
  71:     STRING      idf;
  72: {
  73:     REG INT     rc;
  74: 
  75:     IF (rc=open(idf,0))<0
  76:     THEN    failed(idf,badopen);
  77:     ELSE    return(rc);
  78:     FI
  79: }
  80: 
  81: rename(f1,f2)
  82:     REG INT     f1, f2;
  83: {
  84:     IF f1!=f2
  85:     THEN    dup2(f1, f2);
  86:         close(f1);
  87:         IF f2==0 THEN ioset|=1 FI
  88:     FI
  89: }
  90: 
  91: create(s)
  92:     STRING      s;
  93: {
  94:     REG INT     rc;
  95: 
  96:     IF (rc=creat(s,0666))<0
  97:     THEN    failed(s,badcreate);
  98:     ELSE    return(rc);
  99:     FI
 100: }
 101: 
 102: tmpfil()
 103: {
 104:     itos(serial++); movstr(numbuf,tmpnam);
 105:     return(create(tmpout));
 106: }
 107: 
 108: /* set by trim */
 109: BOOL        nosubst;
 110: 
 111: copy(ioparg)
 112:     IOPTR       ioparg;
 113: {
 114:     CHAR        c, *ends;
 115:     REG CHAR    *cline, *clinep;
 116:     INT     fd;
 117:     REG IOPTR   iop;
 118: 
 119:     IF iop=ioparg
 120:     THEN    copy(iop->iolst);
 121:         ends=mactrim(iop->ioname); IF nosubst THEN iop->iofile &= ~IODOC FI
 122:         fd=tmpfil();
 123:         iop->ioname=cpystak(tmpout);
 124:         iop->iolst=iotemp; iotemp=iop;
 125:         cline=locstak();
 126: 
 127:         LOOP    clinep=cline; chkpr(NL);
 128:             WHILE (c = (nosubst ? readc() :  nextc(*ends)),  !eolchar(c)) DO *clinep++ = c OD
 129:             *clinep=0;
 130:             IF eof ORF eq(cline,ends) THEN break FI
 131:             *clinep++=NL;
 132:             write(fd,cline,clinep-cline);
 133:         POOL
 134:         close(fd);
 135:     FI
 136: }

Defined functions

Defined variables