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ln.c
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C/C++ Source or Header
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1990-07-15
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/* ln - link a file Author: Andy Tanenbaum */
#include <sys/types.h>
#include <sys/stat.h>
char name[256];
struct stat stb;
main(argc, argv)
int argc;
char **argv;
{
char *file1, *file2;
char *last_comp();
if (argc < 2 || argc > 3) usage();
if (access(argv[1], 0) < 0) {
std_err("ln: cannot access ");
std_err(argv[1]);
std_err("\n");
exit(1);
}
if (stat(argv[1], &stb) >= 0 && (stb.st_mode & S_IFMT) == S_IFDIR) usage();
file1 = argv[1];
/* "ln file" means "ln file ." */
if (argc == 2)
file2 = ".";
else
file2 = argv[2];
/* Check to see if target is a directory. */
if (stat(file2, &stb) >= 0 && (stb.st_mode & S_IFMT) == S_IFDIR) {
strcpy(name, file2);
strcat(name, "/");
strcat(name, last_comp(file1));
file2 = name;
}
if (link(file1, file2)) {
std_err("ln: Can't link\n");
exit(1);
}
exit(0);
}
char *last_comp(s)
char *s;
{
/* Return pointer to last component of string. */
int n;
n = strlen(s);
while (n--)
if (*(s + n) == '/') return(s + n + 1);
return(s);
}
usage()
{
std_err("Usage: ln file1 [file2]\n");
exit(1);
}