PWB1/sys/source/sccs4/cmd/help.c

# include	"../hdr/defines.h"

SCCSID(@(#)help	1.5);

/*
	Program to locate helpful info in an ascii file.
	The program accepts a variable number of arguments.

	The file to be searched is determined from the argument. If the
	argument does not contain numerics, the search
	will be attempted on '/usr/lib/help/cmds', with the search key
	being the whole argument.
	If the argument begins with non-numerics but contains
	numerics (e.g, zz32) the search will be attempted on
	'/usr/lib/help/<non-numeric prefix>', (e.g,/usr/lib/help/zz),
	with the search key being <remainder of arg>, (e.g., 32).
	If the argument is all numeric, or if the file as
	determined above does not exist, the search will be attempted on
	'/usr/lib/sccs.hf', which is the old help file, with the
	search key being the entire argument.
	In no case will more than one search per argument be performed.

	File is formatted as follows:

		* comment
		* comment
		-str1
		text
		-str2
		text
		* comment
		text
		-str3
		text

	The "str?" that matches the key is found and
	the following text lines are printed.
	Comments are ignored.

	If the argument is omitted, the program requests it.
*/
char	oldfile[]	"/usr/lib/sccs.hf";
char	helpdir[]	"/usr/lib/help/";
char	hfile[64];
FILE	*iop;
char	line [512];


main(argc,argv)
int argc;
char *argv[];
{
	register int i;
	extern int Fcnt;

	/*
	Tell 'fatal' to issue messages, clean up, and return to its caller.
	*/
	Fflags = FTLMSG | FTLCLN | FTLJMP;

	if (argc == 1)
		findprt(ask());		/* ask user for argument */
	else
		for (i = 1; i < argc; i++)
			findprt(argv[i]);

	exit(Fcnt ? 1 : 0);
}


findprt(p)
char *p;
{
	register char *q;
	char key[50];

	if (setjmp(Fjmp))		/* set up to return here from */
		return;			/* 'fatal' and return to 'main' */

	if (size(p) > 50)
		fatal("argument too long (he2)");

	q = p;

	while (*q && !numeric(*q))
		q++;

	if (*q == '\0') {		/* all alphabetics */
		copy(p,key);
		cat(hfile,helpdir,"cmds",0);
		if (!exists(hfile))
			copy(oldfile,hfile);
	}
	else
		if (q == p) {		/* first char numeric */
			copy(p,key);
			copy(oldfile,hfile);
		}
	else {				/* first char alpha, then numeric */
		copy(p,key);		/* key used as temporary */
		*(key + (q - p)) = '\0';
		cat(hfile,helpdir,key,0);
		copy(q,key);
		if (!exists(hfile)) {
			copy(p,key);
			copy(oldfile,hfile);
		}
	}

	iop = xfopen(hfile,0);

	/*
	Now read file, looking for key.
	*/
	while ((q = fgets(line,512,iop)) != NULL) {
		repl(line,'\n','\0');		/* replace newline char */
		if (line[0] == '-' && equal(&line[1],key))
			break;
	}

	if (q == NULL) {	/* endfile? */
		printf("\n");
		fatal(sprintf(Error,"%s not found (he1)",p));
	}

	printf("\n%s:\n",p);

	while (fgets(line,512,iop) != NULL && line[0] == '-')
		;
	do {
		if (line[0] != '*')
			printf("%s",line);
	} while (fgets(line,512,iop) != NULL && line[0] != '-');

	fclose(iop);
}


ask()
{
	static char resp[51];

	iop = stdin;

	printf("msg number or comd name? ");
	fgets(resp,51,iop);
	return(repl(resp,'\n','\0'));
}


clean_up()
{
	fclose(iop);
}