2.11BSD#431 - /usr/src/usr.bin/ratfor/rio.c

   1: #ifndef lint
   2: static char sccsid[] = "@(#)rio.c	1.2 (Berkeley) 8/11/83";
   3: #endif
   4: 
   5: #include "r.h"
   6: char    ibuf[BUFSIZ];
   7: char    *ip = ibuf;
   8: 
   9: char    type[] = {
  10:     0,  CRAP,   CRAP,   CRAP,   CRAP,   CRAP,   CRAP,   CRAP,
  11:     CRAP,   '\t',   '\n',   CRAP,   CRAP,   CRAP,   CRAP,   CRAP,
  12:     CRAP,   CRAP,   CRAP,   CRAP,   CRAP,   CRAP,   CRAP,   CRAP,
  13:     CRAP,   CRAP,   CRAP,   CRAP,   CRAP,   CRAP,   CRAP,   CRAP,
  14:     ' ',    '!',    '"',    '#',    '$',    '%',    '&',    '\'',
  15:     '(',    ')',    '*',    '+',    ',',    '-',    '.',    '/',
  16:     DIG,    DIG,    DIG,    DIG,    DIG,    DIG,    DIG,    DIG,
  17:     DIG,    DIG,    ':',    ';',    '<',    '=',    '>',    '?',
  18:     '@',    LET,    LET,    LET,    LET,    LET,    LET,    LET,
  19:     LET,    LET,    LET,    LET,    LET,    LET,    LET,    LET,
  20:     LET,    LET,    LET,    LET,    LET,    LET,    LET,    LET,
  21:     LET,    LET,    LET,    '[',    '\\',   ']',    '^',    '_',
  22:     '`',    LET,    LET,    LET,    LET,    LET,    LET,    LET,
  23:     LET,    LET,    LET,    LET,    LET,    LET,    LET,    LET,
  24:     LET,    LET,    LET,    LET,    LET,    LET,    LET,    LET,
  25:     LET,    LET,    LET,    '{',    '|',    '}',    '~',    0,
  26: };
  27: 
  28: gtok(s) char *s; {  /* get token into s */
  29:     register c, t;
  30:     register char *p;
  31:     struct nlist *q;
  32: 
  33:     for(;;) {
  34:         p = s;
  35:         *p++ = c = getchr();
  36:         switch(t = type[c]) {
  37:         case 0:
  38:             if (infptr > 0) {
  39:                 fclose(infile[infptr]);
  40:                 infptr--;
  41:                 continue;
  42:             }
  43:             if (svargc > 1) {
  44:                 svargc--;
  45:                 svargv++;
  46:                 if (infile[infptr] != stdin)
  47:                     fclose(infile[infptr]);
  48:                 if( (infile[infptr] = fopen(*svargv,"r")) == NULL )
  49:                     cant(*svargv);
  50:                 linect[infptr] = 0;
  51:                 curfile[infptr] = *svargv;
  52:                 continue;
  53:             }
  54:             return(EOF);    /* real eof */
  55:         case ' ':
  56:         case '\t':
  57:             while ((c = getchr()) == ' ' || c == '\t')
  58:                 ;   /* skip others */
  59:             if (c == COMMENT || c == '_') {
  60:                 putbak(c);
  61:                 continue;
  62:             }
  63:             if (c != '\n') {
  64:                 putbak(c);
  65:                 *p = '\0';
  66:                 return(' ');
  67:             } else {
  68:                 *s = '\n';
  69:                 *(s+1) = '\0';
  70:                 return(*s);
  71:             }
  72:         case '_':
  73:             while ((c = getchr()) == ' ' || c == '\t')
  74:                 ;
  75:             if (c == COMMENT) {
  76:                 putbak(c);
  77:                 gtok(s);    /* recursive */
  78:             }
  79:             else if (c != '\n')
  80:                 putbak(c);
  81:             continue;
  82:         case LET:
  83:         case DIG:
  84:             while ((t=type[*p = getchr()]) == LET || t == DIG)
  85:                 p++;
  86:             putbak(*p);
  87:             *p = '\0';
  88:             if ((q = lookup(s))->name != NULL && q->ydef == 0) {    /* found but not keyword */
  89:                 if (q->def != fcnloc) { /* not "function" */
  90:                     pbstr(q->def);
  91:                     continue;
  92:                 }
  93:                 getfname(); /* recursive gtok */
  94:             }
  95:             for (p=s; *p; p++)
  96:                 if (*p>='A' && *p<='Z')
  97:                     *p += 'a' - 'A';
  98:             for (p=s; *p; p++)
  99:                 if (*p < '0' || *p > '9')
 100:                     return(LET);
 101:             return(DIG);
 102:         case '[':
 103:             *p = '\0';
 104:             return('{');
 105:         case ']':
 106:             *p = '\0';
 107:             return('}');
 108:         case '$':
 109:         case '\\':
 110:             if ((*p = getchr()) == '(' || *p == ')') {
 111:                 putbak(*p=='(' ? '{' : '}');
 112:                 continue;
 113:             }
 114:             if (*p == '"' || *p == '\'')
 115:                 p++;
 116:             else
 117:                 putbak(*p);
 118:             *p = '\0';
 119:             return('$');
 120:         case COMMENT:
 121:             comment[comptr++] = 'c';
 122:             while ((comment[comptr++] = getchr()) != '\n')
 123:                 ;
 124:             flushcom();
 125:             *s = '\n';
 126:             *(s+1) = '\0';
 127:             return(*s);
 128:         case '"':
 129:         case '\'':
 130:             for (; (*p = getchr()) != c; p++) {
 131:                 if (*p == '\\')
 132:                     *++p = getchr();
 133:                 if (*p == '\n') {
 134:                     error("missing quote");
 135:                     putbak('\n');
 136:                     break;
 137:                 }
 138:             }
 139:             *p++ = c;
 140:             *p = '\0';
 141:             return(QUOTE);
 142:         case '%':
 143:             while ((*p = getchr()) != '\n')
 144:                 p++;
 145:             putbak(*p);
 146:             *p = '\0';
 147:             return('%');
 148:         case '>': case '<': case '=': case '!': case '^':
 149:             return(peek(p, '='));
 150:         case '&':
 151:             return(peek(p, '&'));
 152:         case '|':
 153:             return(peek(p, '|'));
 154:         case CRAP:
 155:             continue;
 156:         default:
 157:             *p = '\0';
 158:             return(*s);
 159:         }
 160:     }
 161: }
 162: 
 163: gnbtok(s) char *s; {
 164:     register c;
 165:     while ((c = gtok(s)) == ' ' || c == '\t')
 166:         ;
 167:     return(c);
 168: }
 169: 
 170: getfname() {
 171:     while (gtok(fcname) == ' ')
 172:         ;
 173:     pbstr(fcname);
 174:     putbak(' ');
 175: }
 176: 
 177: peek(p, c1) char *p, c1; {
 178:     register c;
 179:     c = *(p-1);
 180:     if ((*p = getchr()) == c1)
 181:         p++;
 182:     else
 183:         putbak(*p);
 184:     *p = '\0';
 185:     return(c);
 186: }
 187: 
 188: pbstr(str)
 189: register char *str;
 190: {
 191:     register char *p;
 192: 
 193:     p = str;
 194:     while (*p++);
 195:     --p;
 196:     if (ip >= &ibuf[BUFSIZ]) {
 197:         error("pushback overflow");
 198:         exit(1);
 199:     }
 200:     while (p > str)
 201:         putbak(*--p);
 202: }
 203: 
 204: getchr() {
 205:     register c;
 206: 
 207:     if (ip > ibuf)
 208:         return(*--ip);
 209:     c = getc(infile[infptr]);
 210:     if (c == '\n')
 211:         linect[infptr]++;
 212:     if (c == EOF)
 213:         return(0);
 214:     return(c);
 215: }

Defined functions

Defined variables