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

   1: #ifndef lint
   2: static char sccsid[] = "@(#)word.c	4.6 10/31/85";
   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: #include    "sym.h"
  16: 
  17: 
  18: /* ========	character handling for command lines	========*/
  19: 
  20: 
  21: word()
  22: {
  23:     REG CHAR    c, d;
  24:     REG CHAR    *argp=locstak()+BYTESPERWORD;
  25:     INT     alpha=1;
  26: 
  27:     wdnum=0; wdset=0;
  28: 
  29:     WHILE (c=nextc(0), space(c)) DONE
  30: 
  31:     IF c=='#' ANDF ((flags&prompt)==0 ORF ((flags&ttyflg) ANDF
  32:         standin->fstak!=0))
  33:     THEN    WHILE (c=readc()) ANDF c!=NL DONE
  34:     FI
  35: 
  36:     IF !eofmeta(c)
  37:     THEN    REP IF c==LITERAL
  38:             THEN    *argp++=(DQUOTE);
  39:                 WHILE (c=readc()) ANDF c!=LITERAL
  40:                 DO *argp++=(c|QUOTE); chkpr(c) OD
  41:                 *argp++=(DQUOTE);
  42: 
  43:             ELSE    *argp++=(c);
  44:                 IF c=='=' THEN wdset |= alpha FI
  45:                 IF !alphanum(c) THEN alpha=0 FI
  46:                 IF qotchar(c)
  47:                 THEN    d=c;
  48:                     WHILE (*argp++=(c=nextc(d))) ANDF c!=d
  49:                     DO chkpr(c) OD
  50:                 FI
  51:             FI
  52:         PER (c=nextc(0), !eofmeta(c)) DONE
  53:         argp=endstak(argp);
  54:         IF !letter(argp->argval[0]) THEN wdset=0 FI
  55: 
  56:         peekc=c|MARK;
  57:         IF argp->argval[1]==0 ANDF (d=argp->argval[0], digit(d)) ANDF (c=='>' ORF c=='<')
  58:         THEN    word(); wdnum=d-'0';
  59:         ELSE    /*check for reserved words*/
  60:             IF reserv==FALSE ORF (wdval=syslook(argp->argval,reserved))==0
  61:             THEN    wdarg=argp; wdval=0;
  62:             FI
  63:         FI
  64: 
  65:     ELIF dipchar(c)
  66:     THEN    IF (d=nextc(0))==c
  67:         THEN    wdval = c|SYMREP;
  68:         ELSE    peekc = d|MARK; wdval = c;
  69:         FI
  70:     ELSE    IF (wdval=c)==EOF
  71:         THEN    wdval=EOFSYM;
  72:         FI
  73:         IF iopend ANDF eolchar(c)
  74:         THEN    copy(iopend); iopend=0;
  75:         FI
  76:     FI
  77:     reserv=FALSE;
  78:     return(wdval);
  79: }
  80: 
  81: nextc(quote)
  82:     CHAR        quote;
  83: {
  84:     REG CHAR    c, d;
  85:     IF (d=readc())==ESCAPE
  86:     THEN    IF (c=readc())==NL
  87:         THEN    chkpr(NL); d=nextc(quote);
  88:         ELIF quote ANDF c!=quote ANDF !escchar(c)
  89:         THEN    peekc=c|MARK;
  90:         ELSE    d = c|QUOTE;
  91:         FI
  92:     FI
  93:     return(d);
  94: }
  95: 
  96: readc()
  97: {
  98:     REG CHAR    c;
  99:     REG INT     len;
 100:     REG FILE    f;
 101: 
 102: retry:
 103:     IF peekc
 104:     THEN    c=peekc; peekc=0;
 105:     ELIF (f=standin, f->fnxt!=f->fend)
 106:     THEN    IF (c = *f->fnxt++)==0
 107:         THEN    IF f->feval
 108:             THEN    IF estabf(*f->feval++)
 109:                 THEN    c=EOF;
 110:                 ELSE    c=SP;
 111:                 FI
 112:             ELSE    goto retry; /* = c=readc(); */
 113:             FI
 114:         FI
 115:         IF flags&readpr ANDF standin->fstak==0 THEN prc(c) FI
 116:         IF c==NL THEN f->flin++ FI
 117:     ELIF f->feof ORF f->fdes<0
 118:     THEN    c=EOF; f->feof++;
 119:     ELIF (len=readb())<=0
 120:     THEN    close(f->fdes); f->fdes = -1; c=EOF; f->feof++;
 121:     ELSE    f->fend = (f->fnxt = f->fbuf)+len;
 122:         goto retry;
 123:     FI
 124:     return(c);
 125: }
 126: 
 127: LOCAL   readb()
 128: {
 129:     REG FILE    f=standin;
 130:     REG INT     len;
 131: 
 132:     IF setjmp(INTbuf) == 0 THEN trapjmp[INTR] = 1; FI
 133:     REP IF trapnote&SIGSET THEN newline(); sigchk() FI
 134:     PER (len=read(f->fdes,f->fbuf,f->fsiz))<0 ANDF trapnote DONE
 135:     trapjmp[INTR] = 0;
 136:     return(len);
 137: }

Defined functions

Defined variables