what3.c

来自「unix v7是最后一个广泛发布的研究型UNIX版本」· C语言 代码 · 共 72 行

# include "what..c"

doclook(argc, argv, colevel)
	char *argv[];
{
	int fpa[2], fpb[2], fpc[2], pid1, pid2, st;
	int iarg;
	char *s;
	FILE *ansf;
	struct filans *af;
	struct stat statbuf;
# define RD 0
# define WR 1
# define fmv(x,y) close(y); dup(x); close(x);
/* we want to run chkbib and then lhunt and pipe in & out */
pipe (fpa); /* from this program to chkbib */
pipe (fpb); /* from chkbib to lhunt */
pipe (fpc); /* from lhunt to us */
if (  (pid1 = fork())  ==0)
	{
	fmv(fpa[RD], 0);
	fmv(fpb[WR], 1);
	close(fpa[WR]); close(fpb[RD]); close(fpc[RD]); close(fpc[WR]); 
	execl("/usr/lib/refer/mkey", "mkey", "-s", 0);
	_assert(0);
	}
if (  (pid2 = fork()) == 0)
	{
	char coarg[20];
	sprintf(coarg, "-C%d", colevel);
	fmv(fpb[RD], 0);
	fmv(fpc[WR], 1);
	close(fpa[RD]); close(fpa[WR]); close(fpb[WR]); close(fpc[RD]);
	execl("/usr/lib/refer/hunt", "hunt",
		/* "-P", */
		coarg, "-Ty", "-Fn", "/usr/dict/lookall/All", 0);
	_assert(0);
	}
_assert (pid1 != -1); _assert(pid2 != -1);
close(fpb[RD]); close(fpb[WR]); close(fpa[RD]); close(fpc[WR]);
ansf = fopen("/dev/null", "r");
fmv (fpc[RD], ansf->_file);
for(iarg=1; iarg<argc; iarg++)
	prod(fpa[WR], argv[iarg]);
close(fpa[WR]);
s=fnames;
af=files;
while (af < files+NFILES)
	{
	if (fgets(af->nm=s, NAMES, ansf)==0)
		break;
	trimnl(s);
	if (*s==0) continue;
	while (*s++);
	_assert(s<fnames+NAMES);
	st = stat(af->nm, &statbuf);
	if (st<0) continue;
	af->uid = statbuf.st_uid;
	af->fdate = statbuf.st_mtime;
	af->size = statbuf.st_size;
	af++;
	}
fclose(ansf);
return(af-files);
}
prod(f,s)
	char *s;
{
write (f, s, strlen(s));
write (f, "\n", 1);
}