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#include <path.h>
#include <cassert.h>
#include <stdlib.h>
#include <string.h>
static const path Empty = (path){0, 0};
path path_new(const char* str) {
assert(str);
const size_t size = strlen(str);
if (size > 0) {
char* data = calloc(size + 1, sizeof(char)); // +1 for null
memcpy(data, str, size);
data[size] = 0;
return (path){data, size};
}
return Empty;
}
void path_del(path* path) {
if (path) {
free(path->data);
path->data = 0;
path->size = 0;
}
}
path path_parent_dir(path p) {
assert(p.data);
if (p.size == 0) {
return Empty;
}
size_t i = p.size - 1;
// If the path ends with '/', skip the characters.
while ((i > 0) && (p.data[i] == '/')) {
i--;
}
// Search backwards for the parent dir.
for (; i > 0; --i) {
if (p.data[i] == '/') {
return (path){p.data, i + 1};
}
}
return Empty; // No parent.
}
path path_concat(path left, path right) {
assert(left.data);
assert(right.data);
// +1 for separator.
const size_t out_size = left.size + right.size + 1;
// +1 for null.
char* out = calloc(out_size + 1, sizeof(char));
ASSERT(out);
memcpy(out, left.data, left.size);
out[left.size] = '/';
memcpy(out + left.size + 1, right.data, right.size);
out[out_size] = 0;
return (path){out, out_size};
}
bool path_make_relative(
const char* filepath, const char* path, char* relative,
size_t relative_length) {
assert(filepath);
assert(path);
assert(relative);
const size_t filepath_len = strlen(filepath);
const size_t path_len = strlen(path);
assert(filepath_len < relative_length);
assert(path_len < relative_length);
// Handle empty filepath.
if (filepath_len == 0) {
memcpy(relative, path, path_len);
return true;
}
// Search for the last / in the file path to get its parent directory.
assert(filepath_len > 0);
size_t tm_dir_len = 0;
for (tm_dir_len = strlen(filepath) - 1; tm_dir_len > 0; --tm_dir_len) {
if (filepath[tm_dir_len] == '/') {
break;
}
}
tm_dir_len++; // Preserve the backslash.
// Copy the file path where the parent dir ends.
// Make sure there is enough space in the output.
if ((tm_dir_len + path_len + 1) >= relative_length) {
return false;
}
memcpy(relative, filepath, tm_dir_len);
memcpy(&relative[tm_dir_len], path, path_len);
return true;
}
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