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#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <regex.h>
#include "cleanpath.h"
/**
* Split path into parts by sep
* @param path a string (e.g. "/path1:/path2:/pathN")
* @param sep a delimiter string (e.g. ":")
* @note CleanPath->data string is modified. part are pointers to addresses of path (i.e. do not free())
* @return a pointer to a CleanPath structure
*/
struct CleanPath *cleanpath_init(const char *path, const char *sep) {
struct CleanPath *result;
char *elem;
size_t i;
if (!path || !sep) {
return NULL;
}
result = calloc(1, sizeof(*result));
result->data = strndup(path, ARG_MAX);
result->data_len = strlen(result->data) + 2; // + 2 to handle an empty PATH
result->sep = strdup(sep);
// Split string by separator
elem = strtok(result->data, sep);
for (i = 0; elem != NULL; i++) {
result->part[i] = elem;
elem = strtok(NULL, sep);
}
result->part_nelem = i;
return result;
}
/**
* Filter elements in CleanPath->part array by pattern
* @param path a pointer to a CleanPath structure
* @param mode an integer CLEANPATH_FILTER_EXACT, CLEANPATH_FILTER_LOOSE, or CLEANPATH_FILTER_REGEX
* @param pattern a string
* @see cleanpath_init()
* @note CLEANPATH_FILTER_EXACT is the default mode
*/
void cleanpath_filter(struct CleanPath *path, unsigned mode, const char *pattern) {
int match;
regex_t regex;
for (size_t i = 0; path->part[i]; i++) {
match = 0;
switch(mode) {
case CLEANPATH_FILTER_LOOSE:
match = strstr(path->part[i], pattern) != NULL ? 1 : 0;
break;
case CLEANPATH_FILTER_REGEX:
if (regcomp(®ex, pattern, REG_EXTENDED | REG_NOSUB) != 0) {
return;
}
match = regexec(®ex, path->part[i], 0, NULL, 0) == 0 ? 1 : 0;
regfree(®ex);
break;
case CLEANPATH_FILTER_EXACT:
default:
match = strcmp(path->part[i], pattern) == 0 ? 1 : 0;
break;
}
if (match)
*path->part[i] = '\0';
}
}
/**
* Reconstruct CleanPath->data using CleanPath->part and return a copy of the string
* @param path a pointer to a CleanPath structure
* @see cleanpath_filter()
* @return a string
*/
char *cleanpath_read(struct CleanPath *path) {
char *result;
result = calloc(path->data_len, sizeof(char));
for (size_t i = 0; path->part[i] != NULL; i++) {
// Ignore filtered paths
if (*path->part[i] == '\0') {
continue;
}
strcat(result, path->part[i]);
// Do not append path separator on final element
if (path->part[i + 1] != NULL) {
strcat(result, path->sep);
}
}
return result;
}
/**
* Free memory allocated by cleanpath_init()
* @param path a pointer to a CleanPath structure
*/
void cleanpath_free(struct CleanPath *path) {
free(path->data);
free(path->sep);
free(path);
}
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