driver.c

unix v7是最后一个广泛发布的研究型UNIX版本

	else
		argv[argc++] = t;
	while( !isspace(*t) && *t!='\0' )
		++t;
	if(*t)
		{
		*t++ = '\0';
		while( isspace(*t) )
			++t;
		}
	}

if(argc == 1)   /* no command */
	return(-1);
argv[argc] = 0;

s = path;
t = "/usr/bin/";
while(*t)
	*s++ = *t++;
for(t = argv[1] ; *s++ = *t++ ; )
	;
if((waitpid = fork()) == 0)
	{
	if(inname)
		freopen(inname, "r", stdin);
	if(outname)
		freopen(outname, (append ? "a" : "w"), stdout);
	enbint(SIG_DFL);

	texec(path+9, argv);  /* command */
	texec(path+4, argv);  /*  /bin/command */
	texec(path  , argv);  /* /usr/bin/command */

	fatal1("Cannot load %s",path+9);
	}

return( await(waitpid) );
}





#include "errno.h"

/* modified version from the Shell */
texec(f, av)
char *f;
char **av;
{
extern int errno;

execv(f, av+1);

if (errno==ENOEXEC)
	{
	av[1] = f;
	execv(shellname, av);
	fatal("No shell!");
	}
if (errno==ENOMEM)
	fatal1("%s: too large", f);
}






done(k)
int k;
{
static int recurs	= NO;

if(recurs == NO)
	{
	recurs = YES;
	rmfiles();
	}
exit(k);
}






enbint(k)
int (*k)();
{
if(sigivalue == 0)
	signal(SIGINT,k);
if(sigqvalue == 0)
	signal(SIGQUIT,k);
if(sighvalue == 0)
	signal(SIGHUP,k);
if(sigtvalue == 0)
	signal(SIGTERM,k);
}




intrupt()
{
done(2);
}



await(waitpid)
int waitpid;
{
int w, status;

enbint(SIG_IGN);
while ( (w = wait(&status)) != waitpid)
	if(w == -1)
		fatal("bad wait code");
enbint(intrupt);
if(status & 0377)
	{
	if(status != SIGINT)
		fprintf(diagfile, "Termination code %d", status);
	done(3);
	}
return(status>>8);
}

/* File Name and File Manipulation Routines */

unreadable(s)
register char *s;
{
register FILE *fp;

if(fp = fopen(s, "r"))
	{
	fclose(fp);
	return(NO);
	}

else
	{
	fprintf(diagfile, "Error: Cannot read file %s\n", s);
	return(YES);
	}
}



clf(p)
FILEP *p;
{
if(p!=NULL && *p!=NULL && *p!=stdout)
	{
	if(ferror(*p))
		fatal("writing error");
	fclose(*p);
	}
*p = NULL;
}

rmfiles()
{
rmf(textfname);
rmf(asmfname);
rmf(initfname);
rmf(asmpass2);
#if TARGET == INTERDATA
	rmf(setfname);
#endif
}








/* return -1 if file does not exist, 0 if it is of zero length
   and 1 if of positive length
*/
content(filename)
char *filename;
{
#ifdef VERSION6
	struct stat
		{
		char cjunk[9];
		char size0;
		int size1;
		int ijunk[12];
		} buf;
#else
#	include <sys/types.h>
#	include <sys/stat.h>
	struct stat buf;
#endif

if(stat(filename,&buf) < 0) 
	return(-1);
#ifdef VERSION6
	return(buf.size0 || buf.size1);
#else
	return( buf.st_size > 0 );
#endif
}




crfnames()
{
fname(textfname, "x");
fname(asmfname, "s");
fname(asmpass2, "a");
fname(initfname, "d");
fname(sortfname, "S");
fname(objfdefault, "o");
fname(prepfname, "p");
fname(optzfname, "z");
fname(setfname, "A");
}




rmf(fn)
register char *fn;
{
if(!debugflag && fn!=NULL && *fn!='\0')
	unlink(fn);
}





LOCAL fname(name, suff)
char *name, *suff;
{
sprintf(name, "fort%d.%s", pid, suff);
}




dotchar(s)
register char *s;
{
for( ; *s ; ++s)
	if(s[0]=='.' && s[1]!='\0' && s[2]=='\0')
		return( s[1] );
return(NO);
}



char *lastfield(s)
register char *s;
{
register char *t;
for(t = s; *s ; ++s)
	if(*s == '/')
		t = s+1;
return(t);
}



char *lastchar(s)
register char *s;
{
while(*s)
	++s;
return(s-1);
}

char *setdoto(s)
register char *s;
{
*lastchar(s) = 'o';
return( lastfield(s) );
}



badfile(s)
char *s;
{
fatal1("cannot open intermediate file %s", s);
}



ptr ckalloc(n)
int n;
{
ptr p, calloc();

if( p = calloc(1, (unsigned) n) )
	return(p);

fatal("out of memory");
/* NOTREACHED */
}





copyn(n, s)
register int n;
register char *s;
{
register char *p, *q;

p = q = (char *) ckalloc(n);
while(n-- > 0)
	*q++ = *s++;
return(p);
}



copys(s)
char *s;
{
return( copyn( strlen(s)+1 , s) );
}





nodup(s)
char *s;
{
register char **p;

for(p = loadargs ; p < loadp ; ++p)
	if( !strcmp(*p, s) )
		return(NO);

return(YES);
}



static fatal(t)
char *t;
{
fprintf(diagfile, "Compiler error in file %s: %s\n", infname, t);
if(debugflag)
	abort();
done(1);
exit(1);
}




static fatal1(t,d)
char *t, *d;
{
char buff[100];
fatal( sprintf(buff, t, d) );
}




err(s)
char *s;
{
fprintf(diagfile, "Error in file %s: %s\n", infname, s);
}

LOCAL int nch	= 0;
LOCAL FILEP asmfile;
LOCAL FILEP sortfile;

#include "ftypes"

static ftnint typesize[NTYPES]
	= { 1, SZADDR, SZSHORT, SZLONG, SZLONG, 2*SZLONG,
	    2*SZLONG, 4*SZLONG, SZLONG, 1, 1, 1};
static int typealign[NTYPES]
	= { 1, ALIADDR, ALISHORT, ALILONG, ALILONG, ALIDOUBLE,
	    ALILONG, ALIDOUBLE, ALILONG, 1, 1, 1};

dodata()
{
char buff[50];
char varname[XL+1], ovarname[XL+1];
int status;
flag erred;
ftnint offset, vlen, type;
register ftnint ooffset, ovlen;
ftnint vchar;
int size, align;
int vargroup;
ftnint totlen, doeven();

erred = NO;
ovarname[0] = '\0';
ooffset = 0;
ovlen = 0;
totlen = 0;
nch = 0;

if(status = sys( sprintf(buff, "sort %s >%s", initfname, sortfname) ) )
	fatal1("call sort status = %d", status);
if( (sortfile = fopen(sortfname, "r")) == NULL)
	badfile(sortfname);
if( (asmfile = fopen(asmfname, "a")) == NULL)
	badfile(asmfname);
pruse(asmfile, USEINIT);

while( rdname(&vargroup, varname) && rdlong(&offset) && rdlong(&vlen) && rdlong(&type) )
	{
	size = typesize[type];
	if( strcmp(varname, ovarname) )
		{
		prspace(ovlen-ooffset);
		strcpy(ovarname, varname);
		ooffset = 0;
		totlen += ovlen;
		ovlen = vlen;
		if(vargroup == 0)
			align = (type==TYCHAR ? SZLONG : typealign[type]);
		else	align = ALIDOUBLE;
		totlen = doeven(totlen, align);
		if(vargroup == 2)
			prcomblock(asmfile, varname);
		else
			fprintf(asmfile, LABELFMT, varname);
		}
	if(offset < ooffset)
		{
		erred = YES;
		err("overlapping initializations");
		}
	if(offset > ooffset)
		{
		prspace(offset-ooffset);
		ooffset = offset;
		}
	if(type == TYCHAR)
		{
		if( ! rdlong(&vchar) )
			fatal("bad intermediate file format");
		prch( (int) vchar );
		}
	else
		{
		putc('\t', asmfile);
		while	( putc( getc(sortfile), asmfile)  != '\n')
			;
		}
	if( (ooffset += size) > ovlen)
		{
		erred = YES;
		err("initialization out of bounds");
		}
	}

prspace(ovlen-ooffset);
totlen = doeven(totlen+ovlen, (ALIDOUBLE>SZLONG ? ALIDOUBLE : SZLONG) );
clf(&sortfile);
clf(&asmfile);
clf(&sortfile);
rmf(sortfname);
return(erred);
}




prspace(n)
register ftnint n;
{
register ftnint m;

while(nch>0 && n>0)
	{
	--n;
	prch(0);
	}
m = SZSHORT * (n/SZSHORT);
if(m > 0)
	prskip(asmfile, m);
for(n -= m ; n>0 ; --n)
	prch(0);
}




ftnint doeven(tot, align)
register ftnint tot;
int align;
{
ftnint new;
new = roundup(tot, align);
prspace(new - tot);
return(new);
}



rdname(vargroupp, name)
int *vargroupp;
register char *name;
{
register int i, c;

if( (c = getc(sortfile)) == EOF)
	return(NO);
*vargroupp = c - '0';

for(i = 0 ; i<XL ; ++i)
	{
	if( (c = getc(sortfile)) == EOF)
		return(NO);
	if(c != ' ')
		*name++ = c;
	}
*name = '\0';
return(YES);
}



rdlong(n)
register ftnint *n;
{
register int c;

for(c = getc(sortfile) ; c!=EOF && isspace(c) ; c = getc(sortfile) );
	;
if(c == EOF)
	return(NO);

for(*n = 0 ; isdigit(c) ; c = getc(sortfile) )
	*n = 10* (*n) + c - '0';
return(YES);
}




prch(c)
register int c;
{
static int buff[SZSHORT];

buff[nch++] = c;
if(nch == SZSHORT)
	{
	prchars(asmfile, buff);
	nch = 0;
	}
}