BSD 2 development

[unix-history] / src / whatis.c

/* Copyright (c) 1979 Regents of the University of California */
#include <stdio.h>
#include <ctype.h>
/*
 * whatis - what the heck is that file anyways
 *
 * Bill Joy UCB
 */

char	*calloc();
char	*trim();
unsigned blklen();

main(argc, argv)
	int argc;
	char *argv[];
{
	register char **avp;

	argc--, argv++;
	if (argc == 0) {
		fprintf(stderr, "whatis name ...\n");
		exit(1);
	}
	if (freopen("/usr/lib/whatis", "r", stdin) == NULL) {
		perror("/usr/lib/whatis");
		exit (1);
	}
	argv[argc] = 0;
	for (avp = argv; *avp; avp++)
		*avp = trim(*avp);
	whatis(argv);
	exit(0);
}

whatis(argv)
	char **argv;
{
	char buf[BUFSIZ];
	register char *gotit;
	register char **vp;

	gotit = calloc(1, blklen(argv));
	while (fgets(buf, sizeof buf, stdin) != NULL)
		for (vp = argv; *vp; vp++)
			if (match(buf, *vp)) {
				printf("%s", buf);
				gotit[vp - argv] = 1;
				for (vp++; *vp; vp++)
					if (match(buf, *vp))
						gotit[vp - argv] = 1;
				break;
			}
	for (vp = argv; *vp; vp++)
		if (gotit[vp - argv] == 0)
			printf("%s: not found\n", *vp);
}

match(buf, str)
	char *buf, *str;
{
	register char *bp, *cp;

	bp = buf;
again:
	cp = str;
	while (*bp && *cp && lmatch(*bp, *cp))
		bp++, cp++;
	if (*cp == 0 && (*bp == '(' || *bp == ',' || *bp == '\t' || *bp == ' '))
		return (1);
	while (isalpha(*bp) || isdigit(*bp))
		bp++;
	if (*bp != ',')
		return (0);
	bp++;
	while (isspace(*bp))
		bp++;
	goto again;
}

lmatch(c, d)
	char c, d;
{

	if (c == d)
		return (1);
	if (!isalpha(c) || !isalpha(d))
		return (0);
	if (islower(c))
		c = toupper(c);
	if (islower(d))
		d = toupper(d);
	return (c == d);
}

unsigned
blklen(ip)
	register char **ip;
{
	register int i = 0;

	while (*ip++)
		i++;
	return (i);
}

char *
trim(cp)
	register char *cp;
{
	register char *dp;

	for (dp = cp; *dp; dp++)
		if (*dp == '/')
			cp = dp + 1;
	if (cp[0] != '.') {
		if (cp + 3 <= dp && dp[-2] == '.' && any(dp[-1], "cosa12345678npP"))
			dp[-2] = 0;
		if (cp + 4 <= dp && dp[-3] == '.' && any(dp[-2], "13") && isalpha(dp[-1]))
			dp[-3] = 0;
	}
	return (cp);
}

any(c, cp)
	register int c;
	register char *cp;
{

	while (*cp)
		if (c == *cp++)
			return (1);
	return (0);
}