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/* cpt-readlink --- a utility replacement for readlink
* See LICENSE for copyright information.
*
* This is basically a 'readlink -f' command.
*/
#include <stdio.h>
#include <stdlib.h>
#include <libgen.h>
#include <string.h>
#include <limits.h>
#define DIR_MAX PATH_MAX - NAME_MAX - 1
char *realpath(const char *path, char *resolved_path);
int
main(int argc, char *argv[])
{
char buf[PATH_MAX];
/* We are going to use these if the file doesn't exist, but we can still
* use directories above the file. We are using dname and bname so that
* they don't clash with the functions with the same name.
*/
char dname[DIR_MAX]; /* directory name */
char bname[NAME_MAX]; /* base name */
sprintf(bname, "%s", (basename(argv[1])));
if (argc != 2 || strcmp(argv[1], "--help") == 0) {
fprintf(stderr, "usage: %s [file]\n", argv[0]);
return 1;
}
if (!realpath(argv[1], buf)) {
if (!realpath(dirname(argv[1]), dname)) {
perror(argv[0]);
return 1;
}
sprintf(buf, "%s/%s", dname, bname);
}
printf("%s\n", buf);
return 0;
}
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