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/*
* vi-wrapper Should be installed as /bin/vi. This program first
* checks if /usr/bin/vi exists. If it does, it checks if
* it isn't a link to /bin/vi, and executes it.
*
* If /usr/bin/vi isn't present it does the same for
* /bin/elvis-tiny.
*
* Copyright 2000 Miquel van Smoorenburg miquels@cistron.nl
* License: GPL v2 or later.
*
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#define REALVI "/usr/bin/vi"
#define TINYVI "/bin/elvis-tiny"
#define WRAPVI "/bin/vi"
/*
* Avoid stdio - it saves a few hundred bytes, and so keeps the
* size of the executable _just_ under 4096 bytes.
*/
#define err(x) write(2, x, sizeof(x) - 1)
int main(int argc, char **argv)
{
struct stat real, tiny, wrap;
char *r = NULL;
int e;
if (stat(WRAPVI, &wrap) != 0) {
err("vi: wrapper should be installed as " WRAPVI "\n");
exit(1);
}
if (stat(REALVI, &real) == 0) {
if (real.st_dev == wrap.st_dev && real.st_ino == wrap.st_ino) {
err("vi: " REALVI
" is the same as the wrapper in "
WRAPVI "\n");
exit(1);
}
execv(REALVI, argv);
r = REALVI;
e = errno;
}
if (stat(TINYVI, &tiny) == 0) {
if (tiny.st_dev == wrap.st_dev && tiny.st_ino == wrap.st_ino) {
err("vi: " TINYVI
" is the same as the wrapper in "
WRAPVI "\n");
exit(1);
}
execv(TINYVI, argv);
r = TINYVI;
e = errno;
}
if (r) {
errno = e;
perror(r);
exit(1);
}
err("vi: wrapper couldn't execute " REALVI
" nor " TINYVI "\n");
return 1;
}
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