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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "config.h"
#include "cleanpath/cleanpath.h"
#if !OS_WINDOWS
#include <unistd.h>
#endif
// Make argument parsing less wordy
#define ARGM(X) strcmp(argv[i], X) == 0
// Global program path
static char *program;
int is_valid_arg(char **args, char *s) {
int match;
match = 0;
// cause positional arguments to fall through as valid
if (*s != '-') {
return 1;
}
for (size_t i = 0; args[i] != NULL; i++) {
if (strcmp(args[i], s) == 0) {
match = 1;
}
}
return match;
}
char *getenv_ex(char *s) {
char *env_var;
env_var = getenv(s);
if (!env_var || !strlen(env_var)) {
return NULL;
}
return env_var;
}
void show_listing(struct CleanPath *path) {
if (path == NULL) {
return;
}
for (size_t i = 0; i < CLEANPATH_PART_MAX && path->part[i] != NULL; i++) {
if (*path->part[i] == '\0') {
continue;
}
puts(path->part[i]);
}
}
static int show_default_path() {
char buf[CLEANPATH_PART_MAX];
#if OS_WINDOWS
// I could not find anything in MSDN about dumping default path information.
// The internet agrees "this" is "it" (XP/Vista/8/10):
strncpy(buf, "%SystemRoot%\\system32;%SystemRoot%;%SystemRoot%\\System32\\Wbem", sizeof(buf));
#elif HAVE_CONFSTR // POSIX
size_t cf_status;
cf_status = confstr(_CS_PATH, buf, sizeof(buf));
if (cf_status < 1) { // 0 and -1 are possible error codes for linux and darwin
return 1;
}
#else
*buf = '\0';
#endif
puts(buf);
return 0;
}
void show_path(struct CleanPath *path) {
char *result;
result = cleanpath_read(path);
if (result == NULL) {
return;
}
printf("%s\n", result);
free(result);
}
static void show_version() {
puts(CLEANPATH_VERSION);
}
static void show_usage() {
char *bname;
bname = strrchr(program, '/');
printf("usage: %s [-hVDelrsv] [pattern ...]\n", bname ? bname + 1 : program);
printf(" --help -h Displays this help message\n");
printf(" --version -V Displays the program's version\n");
printf(" --default -D Displays default operating system PATH " CLEANPATH_MSG_NO_DEFAULT_PATH "\n");
printf(" --list Format output as a list\n");
printf(" --exact -e Filter when pattern is an exact match (default)\n");
printf(" --loose -l Filter when any part of the pattern matches\n");
printf(" --regex -r Filter matches with (Extended) Regular Expressions " CLEANPATH_MSG_NO_REGEX "\n");
printf(" --sep [str] -s Use custom path separator (default: ':')\n");
printf(" --env [str] -E Use custom environment variable (default: PATH)\n");
}
int main(int argc, char *argv[]) {
struct CleanPath *path;
char *sep;
char *sys_var;
int do_listing;
int do_default_path;
int filter_mode;
size_t pattern_nelem;
char *pattern[CLEANPATH_PART_MAX];
program = argv[0];
sys_var = NULL;
sep = CLEANPATH_SEP;
do_listing = 0;
do_default_path = 0;
filter_mode = CLEANPATH_FILTER_NONE;
pattern_nelem = 0;
memset(pattern, 0, (sizeof(pattern) / sizeof(char *)) * sizeof(char *));
char *args_valid[] = {
"--help", "-h",
"--version", "-V",
"--list",
"--default", "-D",
"--exact", "-e",
"--loose", "-l",
"--regex", "-r",
"--sep", "-s",
"--env", "-E",
NULL
};
for (int i = 1; i < argc; i++) {
if (!is_valid_arg(args_valid, argv[i])) {
fprintf(stderr, "Unknown option: %s\n", argv[i]);
exit(1);
}
if (ARGM("--help") || ARGM("-h")) {
show_usage();
exit(0);
}
if (ARGM("--version") || ARGM("-V")) {
show_version();
exit(0);
}
if (ARGM("--list")) {
do_listing = 1;
}
if (ARGM("--default") || ARGM("-D")) {
do_default_path = 1;
}
if (ARGM("--exact") || ARGM("-e")) {
filter_mode = CLEANPATH_FILTER_EXACT;
continue;
}
if (ARGM("--loose") || ARGM("-l")) {
filter_mode = CLEANPATH_FILTER_LOOSE;
continue;
}
if (ARGM("--regex") || ARGM("-r")) {
filter_mode = CLEANPATH_FILTER_REGEX;
#if OS_WINDOWS
fprintf(stderr, "WARNING: --regex|-r is not implemented on Windows. Using default filter mode.\n");
#endif
continue;
}
if (ARGM("--sep") || ARGM("-s")) {
i++;
sep = argv[i];
continue;
}
if (ARGM("--env") || ARGM("-E")) {
i++;
sys_var = getenv_ex(argv[i]);
if (!sys_var) {
exit(1);
}
continue;
}
if (filter_mode == CLEANPATH_FILTER_NONE) {
filter_mode = CLEANPATH_FILTER_EXACT;
}
// Record filter patterns
pattern[pattern_nelem] = argv[i];
pattern_nelem++;
}
// Show default system path, and exit
if (do_default_path) {
exit(show_default_path());
}
// Use default environment variable when not set by --var
if (sys_var == NULL) {
sys_var = getenv_ex(CLEANPATH_VAR);
}
// Initialize path data
path = cleanpath_init(sys_var, sep);
if (path == NULL) {
exit(1);
}
// Remove patterns from sys_var
for (size_t i = 0; i < CLEANPATH_PART_MAX && pattern[i] != NULL; i++) {
cleanpath_filter(path, filter_mode, pattern[i]);
}
// Print filtered result
if (do_listing) {
show_listing(path);
} else {
show_path(path);
}
// Clean up
cleanpath_free(path);
return 0;
}
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