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/*
* read a calendar file in vCalendar format. vCalendar files are used by many
* calendar programs such as Apple iCal, Zimbra, Google Calendar, Lotus, and
* many others. The format is defined in RFC 2445, but only a small subset of
* that monster of a standard is implemented here.
*
* read_vcal_file() read an vCalendar files into an entry list.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include <errno.h>
#include <time.h>
#include <Xm/Xm.h>
#include "cal.h"
#include "config.h"
#include "proto.h"
static void parse_vcal_line(struct plist **, char *, char *);
static char *parse_vcal_command_arg(char *);
static time_t parse_vcal_datetime(char *, BOOL *);
static time_t parse_vcal_duration(char *);
static BOOL in_entry; /* between begin..end entry */
extern struct user *user; /* user list (from file_r.c) */
extern struct config config; /* global configuration data */
/*
* read a list from an vCalendar file. If <list> points to a non-null pointer,
* the list in the file is merged into the list. As with add_entry(), <list>
* is a pointer to a pointer to the list because the list might grow and
* must be re-allocated. If the file is empty, no new list is allocated,
* and <list> continues to point to a null pointer.
*/
void read_vcal_file(
struct plist **list, /* list to add to */
FILE *fp, /* file to read list from */
int u) /* user number */
{
char line[1024], *p; /* line buffer */
in_entry = FALSE;
rewind(fp);
while (fgets(line, 1024, fp)) {
if ((p = strchr(line, '\r'))) *p = 0;
if ((p = strchr(line, '\n'))) *p = 0;
parse_vcal_line(list, user ? user[u].name : 0, line);
}
}
/*
* parse a line read from the vCalendar file. Parsing is rather simple: just
* waand ignore everything not known.
*/
static void parse_vcal_line(
struct plist **list, /* list to add to */
char *name, /* user name, 0=not yet known*/
char *line) /* line to be parsed */
{
static struct entry entry; /* temp entry before adding */
char *arg = parse_vcal_command_arg(line);
if (!arg)
return;
if (!strcasecmp(line, "begin") && !strcasecmp(arg, "vevent")) {
clone_entry(&entry, (struct entry *)0);
entry.user = name ? mystrdup(name) : 0;
in_entry = TRUE;
} else if (!strcasecmp(line, "begin") && !strcasecmp(arg, "vtodo")) {
clone_entry(&entry, (struct entry *)0);
entry.user = name ? mystrdup(name) : 0;
in_entry = TRUE;
}
if (!in_entry) /* ignore any entries other than the above */
return;
if (!strcasecmp(line, "dtstart")) {
entry.time = parse_vcal_datetime(arg, &entry.notime);
entry.noalarm = TRUE;
} else if (!strcasecmp(line, "dtend")) {
time_t end = parse_vcal_datetime(arg, 0);
if (end - entry.time < 86400)
entry.length = end - entry.time;
else {
entry.rep_every = 86400;
entry.rep_last = end;
}
} else if (!strcasecmp(line, "duration")) {
time_t dur = parse_vcal_duration(arg);
if (dur < 86400)
entry.length = dur;
else {
entry.rep_every = 86400;
entry.rep_last = entry.time + dur;
}
} else if (!strcasecmp(line, "summary")) {
entry.note = mystrdup(arg);
} else if (!strcasecmp(line, "trigger")) {
entry.time = parse_vcal_datetime(arg, &entry.notime);
} else if (!strcasecmp(line, "organizer") ||
!strcasecmp(line, "attendee") ||
!strcasecmp(line, "due") ||
!strcasecmp(line, "status") ||
!strcasecmp(line, "class") ||
!strcasecmp(line, "category") ||
!strcasecmp(line, "description")) {
char *msg, *p;
for (p=line+1; *p; p++)
*p = tolower(*p);
if (entry.message) {
msg = malloc(strlen(entry.message) + strlen(line)+2 +
strlen(arg) + 1);
sprintf(msg, "%s%s: %s\n", entry.message, line, arg);
free(entry.message);
} else {
msg = malloc(strlen(line)+2 + strlen(arg) + 1);
sprintf(msg, "%s: %s\n", line, arg);
}
entry.message = msg;
} else if (!strcasecmp(line, "end") && (!strcasecmp(arg, "vevent") ||
!strcasecmp(arg, "vtodo"))) {
if (!entry.note)
entry.note = mystrdup("(none)");
add_entry(list, &entry);
in_entry = FALSE;
}
}
/*
* put a \0 at the end of the command, and return a pointer to the argument.
* Lines have the form "command[;junk]*:arg". Return 0 for lines that don't
* have this form; they will be ignored.
*/
static char *parse_vcal_command_arg(
char *line) /* input line to break up */
{
char *p;
for (p=line; *p; p++)
if (*p == ';')
*p++ = 0;
else if (*p == ':') {
*p = 0;
return p+1;
}
return 0;
}
/*
* parse an ICS date/time string of the form dateTtime, with date=YYYYMMDD and
* time=HHMMSS. If a 'Z' follows, the date is UTC and must be converted to
* local time.
*/
static time_t parse_vcal_datetime(
char *str, /* parse this ICS date/time string */
BOOL *notime) /* set to true if Ttime is missing */
{
struct tm tm;
memset(&tm, 0, sizeof(tm));
sscanf(str, "%04d%02d%02d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday);
tm.tm_year -= 1900;
tm.tm_mon--;
if (notime)
*notime = str[8] != 'T';
if (str[8] == 'T')
sscanf(str+9, "%02d%02d%02d",
&tm.tm_hour, &tm.tm_min, &tm.tm_sec);
if (str[15] == 'Z')
return(tm_to_time(&tm) + config.tzone);
else
return(tm_to_time(&tm));
}
/*
* parse an ICS suration string of the form [+|-]PdatesTtimes, where dates is
* a sequence of nW (weeks) or nD; and times is a sequence of nH, nM, or nS.
* For example, P15DT5H30M0S means 15 days and 5:30:00.
*/
static time_t parse_vcal_duration(
char *str) /* parse this ICS duration string */
{
int dur = 0, n = 0, sign = 1;
for (; *str; str++)
switch (*str | 0x20) {
case '+': sign = 1; break;
case '-': sign = -1; break;
case 'p': break;
case 't': break;
case 'w': dur += n * 7 * 86400; n = 0; break;
case 'd': dur += n * 86400; n = 0; break;
case 'h': dur += n * 3600; n = 0; break;
case 'm': dur += n * 60; n = 0; break;
case 's': dur += n; n = 0; break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '9': n = n * 10 + *str - '0'; break;
}
return((time_t)(dur * sign));
}
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