4.3BSD - /usr/src/bin/make/misc.c

   1: static  char *sccsid = "@(#)misc.c	4.3 (Berkeley) 85/08/30";
   2: #include "defs"
   3: 
   4: FSTATIC struct nameblock *hashtab[HASHSIZE];
   5: FSTATIC int nhashed = 0;
   6: 
   7: 
   8: /* simple linear hash.  hash function is sum of
   9:    characters mod hash table size.
  10: */
  11: hashloc(s)
  12: char *s;
  13: {
  14: register int i;
  15: register int hashval;
  16: register char *t;
  17: 
  18: hashval = 0;
  19: 
  20: for(t=s; *t!='\0' ; ++t)
  21:     hashval += *t;
  22: 
  23: hashval %= HASHSIZE;
  24: 
  25: for(i=hashval;
  26:     hashtab[i]!=0 && unequal(s,hashtab[i]->namep);
  27:     i = (i+1)%HASHSIZE ) ;
  28: 
  29: return(i);
  30: }
  31: 
  32: 
  33: struct nameblock *srchname(s)
  34: char *s;
  35: {
  36: return( hashtab[hashloc(s)] );
  37: }
  38: 
  39: 
  40: 
  41: struct nameblock *makename(s)
  42: char *s;
  43: {
  44: /* make a fresh copy of the string s */
  45: 
  46: char *copys();
  47: register struct nameblock *p;
  48: 
  49: if(nhashed++ > HASHSIZE-3)
  50:     fatal("Hash table overflow");
  51: 
  52: p = ALLOC(nameblock);
  53: p->nxtnameblock = firstname;
  54: p->namep = copys(s);
  55: p->linep = 0;
  56: p->done = 0;
  57: p->septype = 0;
  58: p->modtime = 0;
  59: 
  60: firstname = p;
  61: if(mainname == NULL)
  62:     if(s[0]!='.' || hasslash(s) )
  63:         mainname = p;
  64: 
  65: hashtab[hashloc(s)] = p;
  66: 
  67: return(p);
  68: }
  69: 
  70: 
  71: 
  72: hasslash(s)
  73: char *s;
  74: {
  75: for( ; *s ; ++s)
  76:     if(*s == '/')
  77:         return(YES);
  78: return(NO);
  79: }
  80: 
  81: 
  82: 
  83: char *copys(s)
  84: register char *s;
  85: {
  86: char *calloc();
  87: register char *t, *t0;
  88: 
  89: if( (t = t0 = calloc( strlen(s)+1 , sizeof(char)) ) == NULL)
  90:     fatal("out of memory");
  91: while(*t++ = *s++)
  92:     ;
  93: return(t0);
  94: }
  95: 
  96: 
  97: 
  98: char *concat(a,b,c)   /* c = concatenation of a and b */
  99: register char *a,*b;
 100: char *c;
 101: {
 102: register char *t;
 103: t = c;
 104: 
 105: while(*t = *a++) t++;
 106: while(*t++ = *b++);
 107: return(c);
 108: }
 109: 
 110: 
 111: 
 112: suffix(a,b,p)  /* is b the suffix of a?  if so, set p = prefix */
 113: register char *a,*b,*p;
 114: {
 115: char *a0,*b0;
 116: a0 = a;
 117: b0 = b;
 118: 
 119: while(*a++);
 120: while(*b++);
 121: 
 122: if( (a-a0) < (b-b0) ) return(0);
 123: 
 124: while(b>b0)
 125:     if(*--a != *--b) return(0);
 126: 
 127: while(a0<a) *p++ = *a0++;
 128: *p = '\0';
 129: 
 130: return(1);
 131: }
 132: 
 133: 
 134: 
 135: 
 136: 
 137: 
 138: int *ckalloc(n)
 139: register int n;
 140: {
 141: register int *p;
 142: 
 143: if( p = (int *) calloc(1,n) )
 144:     return(p);
 145: 
 146: fatal("out of memory");
 147: /* NOTREACHED */
 148: }
 149: 
 150: /* copy string a into b, substituting for arguments */
 151: char *subst(a,b)
 152: register char *a,*b;
 153: {
 154: static depth    = 0;
 155: register char *s;
 156: char vname[BUFSIZ];
 157: struct varblock *varptr(), *vbp;
 158: char closer;
 159: 
 160: if(++depth > 100)
 161:     fatal("infinitely recursive macro?");
 162: if(a!=0)  while(*a)
 163:     {
 164:     if(*a != '$') *b++ = *a++;
 165:     else if(*++a=='\0' || *a=='$')
 166:         *b++ = *a++;
 167:     else    {
 168:         s = vname;
 169:         if( *a=='(' || *a=='{' )
 170:             {
 171:             closer = ( *a=='(' ? ')' : '}');
 172:             ++a;
 173:             while(*a == ' ') ++a;
 174:             while(*a!=' ' && *a!=closer && *a!='\0') *s++ = *a++;
 175:             while(*a!=closer && *a!='\0') ++a;
 176:             if(*a == closer) ++a;
 177:             }
 178:         else    *s++ = *a++;
 179: 
 180:         *s = '\0';
 181:         if( (vbp = varptr(vname)) ->varval != 0)
 182:             {
 183:             b = subst(vbp->varval, b);
 184:             vbp->used = YES;
 185:             }
 186:         }
 187:     }
 188: 
 189: *b = '\0';
 190: --depth;
 191: return(b);
 192: }
 193: 
 194: 
 195: setvar(v,s)
 196: char *v, *s;
 197: {
 198: struct varblock *varptr(), *p;
 199: 
 200: p = varptr(v);
 201: if(p->noreset == 0)
 202:     {
 203:     p->varval = s;
 204:     p->noreset = inarglist;
 205:     if(p->used && unequal(v,"@") && unequal(v,"*")
 206:         && unequal(v,"<") && unequal(v,"?") )
 207:         fprintf(stderr, "Warning: %s changed after being used\n",v);
 208:     }
 209: }
 210: 
 211: 
 212: eqsign(a)   /*look for arguments with equal signs but not colons */
 213: char *a;
 214: {
 215: register char *s, *t;
 216: 
 217: while(*a == ' ') ++a;
 218: for(s=a  ;   *s!='\0' && *s!=':'  ; ++s)
 219:     if(*s == '=')
 220:         {
 221:         for(t = a ; *t!='=' && *t!=' ' && *t!='\t' ;  ++t );
 222:         *t = '\0';
 223: 
 224:         for(++s; *s==' ' || *s=='\t' ; ++s);
 225:         setvar(a, copys(s));
 226:         return(YES);
 227:         }
 228: 
 229: return(NO);
 230: }
 231: 
 232: 
 233: struct varblock *varptr(v)
 234: char *v;
 235: {
 236: register struct varblock *vp;
 237: 
 238: for(vp = firstvar; vp ; vp = vp->nxtvarblock)
 239:     if(! unequal(v , vp->varname))
 240:         return(vp);
 241: 
 242: vp = ALLOC(varblock);
 243: vp->nxtvarblock = firstvar;
 244: firstvar = vp;
 245: vp->varname = copys(v);
 246: vp->varval = 0;
 247: return(vp);
 248: }
 249: 
 250: 
 251: fatal1(s, t)
 252: char *s, *t;
 253: {
 254: char buf[BUFSIZ];
 255: sprintf(buf, s, t);
 256: fatal(buf);
 257: }
 258: 
 259: 
 260: 
 261: fatal(s)
 262: char *s;
 263: {
 264: if(s) fprintf(stderr, "Make: %s.  Stop.\n", s);
 265: else fprintf(stderr, "\nStop.\n");
 266: #ifdef unix
 267: exit(1);
 268: #endif
 269: #ifdef gcos
 270: exit(0);
 271: #endif
 272: }
 273: 
 274: 
 275: 
 276: yyerror(s)
 277: char *s;
 278: {
 279: char buf[50];
 280: extern int yylineno;
 281: 
 282: sprintf(buf, "line %d: %s", yylineno, s);
 283: fatal(buf);
 284: }
 285: 
 286: 
 287: 
 288: struct chain *appendq(head, tail)
 289: struct chain *head;
 290: char *tail;
 291: {
 292: register struct chain *p, *q;
 293: 
 294: p = ALLOC(chain);
 295: p->datap = tail;
 296: 
 297: if(head)
 298:     {
 299:     for(q = head ; q->nextp ; q = q->nextp)
 300:         ;
 301:     q->nextp = p;
 302:     return(head);
 303:     }
 304: else
 305:     return(p);
 306: }
 307: 
 308: 
 309: 
 310: 
 311: 
 312: char *mkqlist(p)
 313: struct chain *p;
 314: {
 315: register char *qbufp, *s;
 316: static char qbuf[QBUFMAX];
 317: 
 318: if(p == NULL)
 319:     {
 320:     qbuf[0] = '\0';
 321:     return;
 322:     }
 323: 
 324: qbufp = qbuf;
 325: 
 326: for( ; p ; p = p->nextp)
 327:     {
 328:     s = p->datap;
 329:     if(qbufp+strlen(s) > &qbuf[QBUFMAX-3])
 330:         {
 331:         fprintf(stderr, "$? list too long\n");
 332:         break;
 333:         }
 334:     while (*s)
 335:         *qbufp++ = *s++;
 336:     *qbufp++ = ' ';
 337:     }
 338: *--qbufp = '\0';
 339: return(qbuf);
 340: }

Defined functions

Defined variables