On Thu 31 Oct 2013 at 19:02:36 -0000, Mark Scott wrote: > IMHO Pan should use the appropriate format based on the system locale > (LC_TIME) setting.
I have somewhere a little program that overrides the date formatting
routine, since I wanted to do that for Thunderbird. It's Unix-specific
but it works like a charm:
I start Thunderbird like this:
export LD_PRELOAD=$HOME/bin/strftime_override.so
exec /usr/pkg/bin/thunderbird "$@"
where strftime_override.so is the compiled result of this code below.
It just works for the use case of Thunderbird but it can easily be
changed so it matches what Pan does:
# /*
cc -W -Wall -Wformat -Wshadow -shared -fPIC strftime_override.c -o
strftime_override.so
exit
*/
/*
* Compile as shared object (very platform/compile dependend):
* cc -W -Wall -Wformat -Wshadow -shared % -o strftime_override.so
*
* Add -DDEBUG to print the format string passed to strftime() to /dev/tty.
*
* Use and test:
* LD_PRELOAD=./strftime_override.so date +%x
*/
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <dlfcn.h>
#include <errno.h>
#ifdef DEBUG
#include <unistd.h>
#include <fcntl.h>
#endif /* DEBUG */
typedef void (*func_ptr)(void);
typedef size_t (*strftime_func_ptr)(char *, size_t, const char *, const struct
tm *);
size_t strftime(char *, size_t, const char *, const struct tm *)
__attribute__((alias ("strftime_hack")));
static func_ptr
get_libc_symbol(const char *symbol)
{
static void *handle;
static const func_ptr zero_func;
func_ptr func = zero_func;
#ifdef RTLD_NEXT
handle = RTLD_NEXT;
#else /* !RTLD_NEXT */
if (!handle) {
handle = dlopen("libc.so", RTLD_NOW);
}
#endif /* RTLD_NEXT */
if (handle) {
func = dlsym(handle, symbol);
if (!func) {
errno = ENOSYS;
}
} else {
errno = ENOENT;
}
return func;
}
static inline void
trace(const char *format)
{
(void) format;
#ifdef DEBUG
{
int fd = open("/dev/tty", O_WRONLY, 0);
if (fd >= 0) {
write(fd, format, strlen(format));
write(fd, "\n", 1);
close(fd);
}
}
#endif /* DEBUG */
}
size_t
strftime_real(char *buf, size_t maxsize,
const char *format, const struct tm *timeptr)
{
static strftime_func_ptr func;
if (!func) {
func = (strftime_func_ptr) get_libc_symbol("strftime");
}
return (*func)(buf, maxsize, format, timeptr);
}
static char *months[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
size_t
strftime_hack(char *buf, size_t maxsize,
const char *format, const struct tm *timeptr)
{
if (format && buf && maxsize > 0 && timeptr) {
trace(format);
if (0 == strcmp(format, "%x %H:%M")) {
size_t len;
#if 0
len = snprintf(buf, maxsize, "%4u-%02u-%02u %02d:%02d",
timeptr->tm_year + 1900,
timeptr->tm_mon + 1,
timeptr->tm_mday,
timeptr->tm_hour,
timeptr->tm_min);
#else
len = snprintf(buf, maxsize, "%02u-%s-%4u %02d:%02d",
timeptr->tm_mday,
(timeptr->tm_mon >= 0 && timeptr->tm_mon < 12 ?
months[timeptr->tm_mon] : "***"),
timeptr->tm_year + 1900,
timeptr->tm_hour,
timeptr->tm_min);
#endif
return len < maxsize ? len : 0;
}
if (0 == strcmp(format, "%H:%M")) {
size_t len;
len = snprintf(buf, maxsize, "%02d:%02d",
timeptr->tm_hour,
timeptr->tm_min);
return len < maxsize ? len : 0;
}
/* TODO: Handle more formats */
}
return strftime_real(buf, maxsize, format, timeptr);
}
-Olaf.
--
___ Olaf 'Rhialto' Seibert -- The Doctor: No, 'eureka' is Greek for
\X/ rhialto/at/xs4all.nl -- 'this bath is too hot.'
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