2.9BSD/usr/src/cmd/refer/refer/hunt8.c

# include "stdio.h"
# define unopen(fil) {if (fil!=NULL) {fclose(fil); fil=NULL;}}
extern long indexdate, gdate();
runbib (s)
char *s;
{
	/* make a file suitable for fgrep */
	char tmp[200];
	sprintf(tmp, "/usr/lib/refer/mkey %s >%s.ig", s,s);
	system(tmp);
}
makefgrep(indexname)
char *indexname;
{
	FILE *fa =NULL, *fb =NULL;
	if (ckexist(indexname, ".ig"))
	{
		/* existing gfrep -type index */
# if D1
		fprintf(stderr, "found fgrep\n");
# endif
		fa = iopen(indexname, ".ig");
		fb = iopen(indexname, "");
		if (gdate(fb)>gdate(fa))
		{
			if (fa!=NULL)
				fclose(fa);
			runbib(indexname);
			fa= iopen(indexname, ".ig");
		}
		indexdate = gdate(fa);
		unopen(fa); 
		unopen(fb);
	}
	else
		if (ckexist(indexname, ""))
		{
			/* make fgrep */
# if D1
			fprintf(stderr, "make fgrep\n");
# endif
			runbib(indexname);
			time(&indexdate);
			unopen(fb);
		}
		else /* failure */
			return(0);
	return(1); /* success */
}
ckexist(s, t)
char *s, *t;
{
	char fnam[100];
	strcpy (fnam, s);
	strcat (fnam, t);
	return (access(fnam, 04) != -1);
}
iopen (s, t)
char *s, *t;
{
	char fnam[100];
	FILE *f;
	strcpy (fnam, s);
	strcat (fnam, t);
	f = fopen (fnam, "r");
	if (f == NULL)
	{
		err("Missing expected file %s", fnam);
		exit(1);
	}
	return(f);
}