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#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
};
Date *Base = nil;
Biobuf in;
int debug, matchyear;
void dates(Tm*);
void upper2lower(char*, char*, int);
void *emalloc(unsigned int);
void
usage(void)
{
fprint(2, "usage: calendar [-dy] [-p days] [files ...]\n");
exits("usage");
}
void
main(int argc, char *argv[])
{
int i, fd, ahead;
long now;
char *line;
Tm *tm;
Date *d;
char buf[1024];
ahead = 0;
ARGBEGIN{
case 'y':
matchyear = 1;
break;
case 'd':
debug = 1;
break;
case 'p':
ahead = atoi(EARGF(usage()));
break;
default:
usage();
}ARGEND;
/* make a list of dates */
now = time(0);
tm = localtime(now);
dates(tm);
now += Secondsperday;
tm = localtime(now);
dates(tm);
if(tm->wday == 6){
now += Secondsperday;
tm = localtime(now);
dates(tm);
}
if(tm->wday == 0){
now += Secondsperday;
tm = localtime(now);
dates(tm);
}
if(ahead){
now = time(0);
now += ahead * Secondsperday;
tm = localtime(now);
dates(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
strecpy(buf, buf+sizeof 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=Base; 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"
};
char *nth[] = {
"first",
"second",
"third",
"fourth",
"fifth"
};
char *days[] = {
"sunday",
"monday",
"tuesday",
"wednesday",
"thursday",
"friday",
"saturday"
};
/*
* 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.
*/
void
dates(Tm *tm)
{
Date *nd;
char mo[128], day[128], buf[128];
if(utflen(days[tm->wday]) > 3)
snprint(day, sizeof day, "%3.3s(%s)?",
days[tm->wday], days[tm->wday]+3);
else
snprint(day, sizeof day, "%3.3s", days[tm->wday]);
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|$)(((%d|%d|%02d)( |\t|$))|[^0-9]|([0-9]+[^0-9 \t]))",
mo, tm->mon+1, tm->mday, tm->year+1900, tm->year%100, tm->year%100);
else
snprint(buf, sizeof buf,
"^[\t ]*((%s( |\t)+)|(%d/))%d( |\t|$)",
mo, tm->mon+1, tm->mday);
if(debug)
print("%s\n", buf);
nd = emalloc(sizeof(Date));
nd->p = regcomp(buf);
nd->next = Base;
Base = nd;
if (matchyear)
snprint(buf, sizeof buf,
"^[\t ]*%d( |\t)+(%s)( |\t|$)(((%d|%d|%02d)( |\t|$))|[^0-9]|([0-9]+[^0-9 \t]))",
tm->mday, mo, tm->year+1900, tm->year%100, tm->year%100);
else
snprint(buf, sizeof buf,
"^[\t ]*%d( |\t)+(%s)( |\t|$)",
tm->mday, mo);
if(debug)
print("%s\n", buf);
nd = emalloc(sizeof(Date));
nd->p = regcomp(buf);
nd->next = Base;
Base = nd;
snprint(buf, sizeof buf, "^[\t ]*every[ \t]+%s", day);
if(debug)
print("%s\n", buf);
nd = emalloc(sizeof(Date));
nd->p = regcomp(buf);
nd->next = Base;
Base = nd;
snprint(buf, sizeof buf, "[\t ]*the[\t ]+%s[\t ]+%s", nth[(tm->mday-1)/7], day);
if(debug)
print("%s\n", buf);
nd = emalloc(sizeof(Date));
nd->p = regcomp(buf);
nd->next = Base;
Base = nd;
}
/*
* 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*
emalloc(unsigned int n)
{
void *p;
p = malloc(n);
if(p == 0){
fprint(2, "calendar: malloc failed: %r\n");
exits("malloc");
}
return p;
}
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