new utilities.

the .C files compile but are renamed to avoid building automatically.

src/cmd/calendar.c

@@ -0,0 +1,195 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <regexp.h>
+#include <ctype.h>
+
+typedef struct Date	Date;
+struct Date {
+	Reprog *p;	/* an RE to match this date */
+	Date *next;	/* pointer to next in list */
+};
+
+enum{
+	Secondsperday = 24*60*60
+};
+
+Biobuf in;
+int debug, matchyear;
+
+Date *dates(Date**, Tm*);
+void upper2lower(char*, char*, int);
+void *alloc(unsigned int);
+
+void
+main(int argc, char *argv[])
+{
+	int i, fd, ahead;
+	long now;
+	char *line;
+	Tm *tm;
+	Date *first, *last, *d;
+	char buf[1024];
+
+	ahead = 0;
+	ARGBEGIN{
+	case 'y':
+		matchyear = 1;
+		break;
+	case 'd':
+		debug = 1;
+		break;
+	case 'p':
+		ahead = atoi(ARGF());
+		break;
+	default:
+		fprint(2, "usage: calendar [-y] [-d] [files ...]\n");
+		exits("usage");
+	}ARGEND;
+
+	/* make a list of dates */
+	now = time(0);
+	tm = localtime(now);
+	last = nil;
+	first = dates(&last, tm);
+	now += Secondsperday;
+	tm = localtime(now);
+	dates(&last, tm);
+	if(tm->wday == 6){
+		now += Secondsperday;
+		tm = localtime(now);
+		dates(&last, tm);
+	}
+	if(tm->wday == 0){
+		now += Secondsperday;
+		tm = localtime(now);
+		dates(&last, tm);
+	}
+	if(ahead){
+		now = time(0);
+		now += ahead * Secondsperday;
+		tm = localtime(now);
+		dates(&last, tm);
+	}
+
+	for(i=0; i<argc || (i==0 && argc==0); i++){
+		if(i==0 && argc==0)
+			snprint(buf, sizeof(buf),
+				"/usr/%s/lib/calendar", getuser());
+		else
+			strcpy(buf, argv[i]);
+		fd = open(buf, OREAD);
+		if(fd<0 || Binit(&in, fd, OREAD)<0){
+			fprint(2, "calendar: can't open %s: %r\n", buf);
+			exits("open");
+		}
+
+		/* go through the file */
+		while(line = Brdline(&in, '\n')){
+			line[Blinelen(&in) - 1] = 0;
+			upper2lower(buf, line, sizeof buf);
+			for(d=first; d; d=d->next)
+				if(regexec(d->p, buf, 0, 0)){
+					print("%s\n", line);
+					break;
+				}
+		}
+		close(fd);
+	}
+	exits("");
+}
+
+char *months[] = 
+{
+	"january",
+	"february",
+	"march",
+	"april",
+	"may",
+	"june",
+	"july",
+	"august",
+	"september",
+	"october",
+	"november",
+	"december"
+};
+
+/*
+ * Generate two Date structures.  First has month followed by day;
+ * second has day followed by month.  Link them into list after
+ * last, and return the first.
+ */
+Date*
+dates(Date **last, Tm *tm)
+{
+	Date *first;
+	Date *nd;
+	char mo[128], buf[128];
+
+	if(utflen(months[tm->mon]) > 3)
+		snprint(mo, sizeof mo, "%3.3s(%s)?",
+			months[tm->mon], months[tm->mon]+3);
+	else
+		snprint(mo, sizeof mo, "%3.3s", months[tm->mon]);
+	if (matchyear)
+		snprint(buf, sizeof buf,
+			"(^| |\t)((%s( |\t)+)|(%d/))%d( |\t|$)(((%d|%d)( |\t|$))|[^0-9]|([0-9]+[^0-9 \t]))",
+			mo, tm->mon+1, tm->mday, tm->year+1900, tm->year%100);
+	else
+		snprint(buf, sizeof buf,
+			"(^| |\t)((%s( |\t)+)|(%d/))%d( |\t|$)",
+			mo, tm->mon+1, tm->mday);
+	if(debug)
+		print("%s\n", buf);
+
+	first = alloc(sizeof(Date));
+	if(*last)
+		(*last)->next = first;
+	first->p = regcomp(buf);	
+
+	if (matchyear)
+		snprint(buf, sizeof buf,
+			"(^| |\t)%d( |\t)+(%s)( |\t|$)(((%d|%d)( |\t|$))|[^0-9]|([0-9]+[^0-9 \t]))",
+			tm->mday, mo, tm->year+1900, tm->year%100);
+	else
+		snprint(buf, sizeof buf,
+			"(^| |\t)%d( |\t)+(%s)( |\t|$)",
+			tm->mday, mo);
+	if(debug)
+		print("%s\n", buf);
+	nd = alloc(sizeof(Date));
+	nd->p = regcomp(buf);	
+	nd->next = 0;
+	first->next = nd;
+	*last = nd;
+
+	return first;
+}
+
+/*
+ * Copy 'from' to 'to', converting to lower case
+ */
+void
+upper2lower(char *to, char *from, int len)
+{
+	while(--len>0 && *from!='\0')
+		*to++ = tolower(*from++);
+	*to = 0;
+}
+
+/*
+ * Call malloc and check for errors
+ */
+void*
+alloc(unsigned int n)
+{
+	void *p;
+
+	p = malloc(n);
+	if(p == 0){
+		fprint(2, "calendar: malloc failed: %r\n");
+		exits("malloc");
+	}
+	return p;
+}