BSD 4_1c_2 release

[unix-history] / usr / src / bin / make / misc.c

static  char *sccsid = "@(#)misc.c      4.2 (Berkeley) 82/10/19";
#include "defs"

FSTATIC struct nameblock *hashtab[HASHSIZE];
FSTATIC int nhashed     = 0;


/* simple linear hash.  hash function is sum of
  characters mod hash table size.
*/
hashloc(s)
char *s;
{
register int i;
register int hashval;
register char *t;

hashval = 0;

for(t=s; *t!='\0' ; ++t)
       hashval += *t;

hashval %= HASHSIZE;

for(i=hashval;
       hashtab[i]!=0 && unequal(s,hashtab[i]->namep);
       i = (i+1)%HASHSIZE ) ;

return(i);
}


struct nameblock *srchname(s)
char *s;
{
return( hashtab[hashloc(s)] );
}



struct nameblock *makename(s)
char *s;
{
/* make a fresh copy of the string s */

char *copys();
register struct nameblock *p;

if(nhashed++ > HASHSIZE-3)
       fatal("Hash table overflow");

p = ALLOC(nameblock);
p->nxtnameblock = firstname;
p->namep = copys(s);
p->linep = 0;
p->done = 0;
p->septype = 0;
p->modtime = 0;

firstname = p;
if(mainname == NULL)
       if(s[0]!='.' || hasslash(s) )
               mainname = p;

hashtab[hashloc(s)] = p;

return(p);
}



hasslash(s)
char *s;
{
for( ; *s ; ++s)
       if(*s == '/')
               return(YES);
return(NO);
}
\f


char *copys(s)
register char *s;
{
char *calloc();
register char *t, *t0;

if( (t = t0 = calloc( strlen(s)+1 , sizeof(char)) ) == NULL)
       fatal("out of memory");
while(*t++ = *s++)
       ;
return(t0);
}



char *concat(a,b,c)   /* c = concatenation of a and b */
register char *a,*b;
char *c;
{
register char *t;
t = c;

while(*t = *a++) t++;
while(*t++ = *b++);
return(c);
}



suffix(a,b,p)  /* is b the suffix of a?  if so, set p = prefix */
register char *a,*b,*p;
{
char *a0,*b0;
a0 = a;
b0 = b;

while(*a++);
while(*b++);

if( (a-a0) < (b-b0) ) return(0);

while(b>b0)
       if(*--a != *--b) return(0);

while(a0<a) *p++ = *a0++;
*p = '\0';

return(1);
}






int *ckalloc(n)
register int n;
{
register int *p;

if( p = (int *) calloc(1,n) )
       return(p);

fatal("out of memory");
/* NOTREACHED */
}
\f
/* copy string a into b, substituting for arguments */
char *subst(a,b)
register char *a,*b;
{
static depth    = 0;
register char *s;
char vname[100];
struct varblock *varptr(), *vbp;
char closer;

if(++depth > 100)
       fatal("infinitely recursive macro?");
if(a!=0)  while(*a)
       {
       if(*a != '$') *b++ = *a++;
       else if(*++a=='\0' || *a=='$')
               *b++ = *a++;
       else    {
               s = vname;
               if( *a=='(' || *a=='{' )
                       {
                       closer = ( *a=='(' ? ')' : '}');
                       ++a;
                       while(*a == ' ') ++a;
                       while(*a!=' ' && *a!=closer && *a!='\0') *s++ = *a++;
                       while(*a!=closer && *a!='\0') ++a;
                       if(*a == closer) ++a;
                       }
               else    *s++ = *a++;

               *s = '\0';
               if( (vbp = varptr(vname)) ->varval != 0)
                       {
                       b = subst(vbp->varval, b);
                       vbp->used = YES;
                       }
               }
       }

*b = '\0';
--depth;
return(b);
}


setvar(v,s)
char *v, *s;
{
struct varblock *varptr(), *p;

p = varptr(v);
if(p->noreset == 0)
       {
       p->varval = s;
       p->noreset = inarglist;
       if(p->used && unequal(v,"@") && unequal(v,"*")
           && unequal(v,"<") && unequal(v,"?") )
               fprintf(stderr, "Warning: %s changed after being used\n",v);
       }
}


eqsign(a)   /*look for arguments with equal signs but not colons */
char *a;
{
register char *s, *t;

while(*a == ' ') ++a;
for(s=a  ;   *s!='\0' && *s!=':'  ; ++s)
       if(*s == '=')
               {
               for(t = a ; *t!='=' && *t!=' ' && *t!='\t' ;  ++t );
               *t = '\0';

               for(++s; *s==' ' || *s=='\t' ; ++s);
               setvar(a, copys(s));
               return(YES);
               }

return(NO);
}


struct varblock *varptr(v)
char *v;
{
register struct varblock *vp;

for(vp = firstvar; vp ; vp = vp->nxtvarblock)
       if(! unequal(v , vp->varname))
               return(vp);

vp = ALLOC(varblock);
vp->nxtvarblock = firstvar;
firstvar = vp;
vp->varname = copys(v);
vp->varval = 0;
return(vp);
}


fatal1(s, t)
char *s, *t;
{
char buf[BUFSIZ];
sprintf(buf, s, t);
fatal(buf);
}



fatal(s)
char *s;
{
if(s) fprintf(stderr, "Make: %s.  Stop.\n", s);
else fprintf(stderr, "\nStop.\n");
#ifdef unix
exit(1);
#endif
#ifdef gcos
exit(0);
#endif
}



yyerror(s)
char *s;
{
char buf[50];
extern int yylineno;

sprintf(buf, "line %d: %s", yylineno, s);
fatal(buf);
}



struct chain *appendq(head, tail)
struct chain *head;
char *tail;
{
register struct chain *p, *q;

p = ALLOC(chain);
p->datap = tail;

if(head)
       {
       for(q = head ; q->nextp ; q = q->nextp)
               ;
       q->nextp = p;
       return(head);
       }
else
       return(p);
}





char *mkqlist(p)
struct chain *p;
{
register char *qbufp, *s;
static char qbuf[QBUFMAX];

if(p == NULL)
       {
       qbuf[0] = '\0';
       return;
       }

qbufp = qbuf;

for( ; p ; p = p->nextp)
       {
       s = p->datap;
       if(qbufp+strlen(s) > &qbuf[QBUFMAX-3])
               {
               fprintf(stderr, "$? list too long\n");
               break;
               }
       while (*s)
               *qbufp++ = *s++;
       *qbufp++ = ' ';
       }
*--qbufp = '\0';
return(qbuf);
}