diff options
Diffstat (limited to 'which.c')
-rw-r--r-- | which.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/which.c b/which.c new file mode 100644 index 000000000..365c83bcd --- /dev/null +++ b/which.c @@ -0,0 +1,98 @@ +/* vi: set sw=4 ts=4: */ +/* + * Which implementation for busybox + * + * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +/* getopt not needed */ +#include <string.h> +#include <stdio.h> +#include <stdlib.h> +#include "busybox.h" + +static int file_exists(char *file) +{ + struct stat filestat; + + if (stat(file, &filestat) == 0 && filestat.st_mode & S_IXUSR) + return 1; + else + return 0; +} + +extern int which_main(int argc, char **argv) +{ + char *path_list, *path_n; + int i, count=1, found, status = EXIT_SUCCESS; + + if (argc <= 1 || **(argv + 1) == '-') + show_usage(); + argc--; + + path_list = getenv("PATH"); + if (path_list != NULL) { + for(i=strlen(path_list); i > 0; i--) + if (path_list[i]==':') { + path_list[i]=0; + count++; + } + } else { + path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin"; + count = 5; + } + + while(argc-- > 0) { + char *buf; + path_n = path_list; + argv++; + found = 0; + + /* + * Check if we were given the full path, first. + * Otherwise see if the file exists in our $PATH. + */ + buf = *argv; + if (file_exists(buf)) { + puts(buf); + found = 1; + } else { + for (i = 0; i < count; i++) { + buf = concat_path_file(path_n, *argv); + if (file_exists(buf)) { + puts(buf); + found = 1; + break; + } + free(buf); + path_n += (strlen(path_n) + 1); + } + } + if (!found) + status = EXIT_FAILURE; + } + return status; +} + +/* +Local Variables: +c-file-style: "linux" +c-basic-offset: 4 +tab-width: 4 +End: +*/ |