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/*
Copyright (C) 1993 Christoph Berg <cb@df7cb.de>
This program is free software, see COPYING for copyright terms.
sdate is based on fakeroot:
Copyright: GPL.
Author: joost witteveen (joostje@debian.org)
*/
/* #define _POSIX_C_SOURCE 199309L whatever that may mean...*/
/* #define _BSD_SOURCE I use strdup, S_IFDIR, etc */
/* Roderich Schupp writes (bug #79100):
/usr/include/dlfcn.h from libc6 2.2-5 defines RTLD_NEXT only
when compiled with _GNU_SOURCE defined. Hence libfakeroot.c doesn't pick
it
up and does a dlopen("/lib/libc.so.6",...) in get_libc().
This works most of the time, but explodes if you have an arch-optimized
libc installed: the program now has two versions of libc.so
(/lib/libc.so.6 and, say, /lib/i586/libc.so.6) mapped. Again for
some programs you might get away with this, but running bash under
fakeroot
always bombs. Simple fix:
*/
#define _GNU_SOURCE
#include "config.h"
#include <stdlib.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <dlfcn.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>
/* sdate */
#include <time.h>
/*
Where are those shared libraries?
If I knew of a configure/libtool way to find that out, I'd use it. Or
any other way other than the method I'm using below. Does anybody know
how I can get that location? (BTW, symply linking a programme, and running
`ldd' on it isn't the option, as Digital Unix doesn't have ldd)
*/
/*
Note that LIBCPATH isn't actually used on Linux or Solaris, as RTLD_NEXT
is defined and we use that to get the `next_*' functions
Linux:
*/
/* OSF1 :*/
/*#define LIBCPATH "/usr/shlib/libc.so"*/
/*
// next_wrap_st:
// this structure is used in next_wrap, which is defined in
// wrapstruct.h, included below
*/
struct next_wrap_st{
void **doit;
char *name;
};
void *get_libc(){
#ifndef RTLD_NEXT
void *lib=0;
if(!lib){
lib= dlopen(LIBCPATH,RTLD_LAZY);
}
if (NULL==lib) {
fprintf(stderr, "Couldn't find libc at: %s\n", LIBCPATH);
abort();
}
return lib;
#else
return RTLD_NEXT;
#endif
}
void load_library_symbols(void);
#include "wrapped.h"
#include "wraptmpf.h"
#include "wrapdef.h"
#include "wrapstruct.h"
void load_library_symbols(void){
/* this function loads all original functions from the C library.
I ran into problems when each function individually
loaded it's original counterpart, as RTLD_NEXT seems to have
a different meaning in files with different names than libtricks.c
(I.E, dlsym(RTLD_NEXT, ...) called in vsearch.c returned funtions
defined in libtricks */
/* The calling of this function itself is somewhat tricky:
the awk script wrapawk generates several .h files. In wraptmpf.h
there are temporary definitions for tmp_*, that do the call
to this function. The other generated .h files do even more tricky
things :) */
static int done=0;
int i;
char* msg;
if(!done){
for(i=0; next_wrap[i].doit; i++){
*(next_wrap[i].doit)=dlsym(get_libc(), next_wrap[i].name);
if ( (msg = dlerror()) != NULL){
fprintf (stderr, "dlsym(%s): %s\n", next_wrap[i].name, msg);
/* abort ();*/
}
}
}
}
/* sdate */
static inline int epoch_days(int y, int m) /* days past 1970-01-01 */
{
/* 1 2 3 4 5 6 7 8 9 10 11 12 */
static int mon_offset[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
return 365 * (y - 70)
+ (int)((y - 69) / 4) /* leap days in previous years */
+ ((y % 4 == 0) && (m >= 2)) /* this year's leap day */
+ mon_offset[m];
}
static struct tm *septemberfy(struct tm *t)
{
static int sep_offset = -1;
static int sep_y = 93;
static int sep_m = 8;
if (sep_offset == -1) {
char *e;
if ((e = getenv("SDATE_EPOCH"))) {
sscanf(e, "%d-%d", &sep_y, &sep_m);
sep_m--;
}
if (sep_y < 70)
sep_y += 100;
if (sep_y > 1900)
sep_y -= 1900;
if (sep_y < 1 || sep_y > 199) /* range where our leap year stuff works */
sep_y = 93;
if (sep_m < 0 || sep_m > 11)
sep_m = 8;
sep_offset = epoch_days(sep_y, sep_m);
}
if((t->tm_year == sep_y && t->tm_mon > sep_m) || t->tm_year > sep_y) {
#ifdef DEBUG
fprintf(stderr, "septemberfy: %d-%d-%d\n", t->tm_year, t->tm_mon, t->tm_mday);
#endif
if(t->tm_mon >= 0 && t->tm_mon < 12)
t->tm_mday += epoch_days(t->tm_year, t->tm_mon) - sep_offset;
t->tm_mon = sep_m;
t->tm_year = sep_y;
}
return t;
}
struct tm *gmtime(const time_t *timep) {
struct tm *result = next_gmtime(timep);
#ifdef DEBUG
fputs("gmtime wrapped\n", stderr);
#endif
return septemberfy(result);
}
struct tm *gmtime_r(const time_t *timep, struct tm *result) {
#ifdef DEBUG
fputs("gmtime_r wrapped\n", stderr);
#endif
result = next_gmtime_r(timep, result);
return septemberfy(result);
}
struct tm *localtime(const time_t *timep) {
struct tm *result = next_localtime(timep);
#ifdef DEBUG
fputs("localtime wrapped\n", stderr);
#endif
return septemberfy(result);
}
struct tm *localtime_r(const time_t *timep, struct tm *result) {
#ifdef DEBUG
fputs("localtime_r wrapped\n", stderr);
#endif
result = next_localtime_r(timep, result);
return septemberfy(result);
}
/*
time_t mktime(struct tm *tm) {
#ifdef DEBUG
fputs("mktime wrapped\n", stderr);
#endif
return next_mktime(tm);
}
*/
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