137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
// vim:fileencoding=utf-8:foldmethod=marker
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#include "cpath.h"
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#include "../allocators/arena/mem_arena_allocator.h"
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#include "../../common/aliases/aliases.h"
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#include "../../common/misc/misc_utils.h"
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#include "../../base/dbl_list/dbl_list.h"
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#include "../../base/mem/allocator/mem_allocator.h"
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#include "../../base/strings/str8/str8.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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u32 wapp_cpath_join_path(WpStr8 *dst, const WpStr8List *parts) {
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if (!dst || !parts) {
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return CPATH_JOIN_INVALID_ARGS;
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}
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if (parts->node_count == 0) {
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return CPATH_JOIN_EMPTY_PARTS;
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}
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WpStr8 separator = wpStr8Buf(4);
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wpStr8PushBack(&separator, WAPP_PATH_SEP);
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u64 required_capacity = parts->node_count * separator.size + wpStr8ListTotalSize(parts);
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if (dst->capacity < required_capacity) {
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return CPATH_JOIN_INSUFFICIENT_DST_CAPACITY;
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}
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// Handle first node
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WpStr8 *first_node = wapp_dbl_list_get(WpStr8, parts, 0);
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wpStr8CopyStr8Capped(dst, first_node);
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// NOTE (Abdelrahman): Uses a while loop instead of a for loop to get rid of
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// MSVC Spectre mitigation warnings
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WpStr8 *node = first_node;
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u64 node_index = 1;
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b8 running = node_index < parts->node_count;
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while (running) {
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node = wapp_dbl_list_get(WpStr8, parts, node_index);
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if (node->size == 0) {
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goto CPATH_JOIN_LOOP_END;
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}
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if (dst->size > 0) {
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char dst_last = wpStr8Get(dst, dst->size - 1);
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char node_start = wpStr8Get(node, 0);
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b8 add_path_sep = dst_last != WAPP_PATH_SEP && node_start != WAPP_PATH_SEP;
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if (add_path_sep) {
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wpStr8ConcatCapped(dst, &separator);
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}
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}
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wpStr8ConcatCapped(dst, node);
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CPATH_JOIN_LOOP_END:
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++node_index;
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running = node_index < parts->node_count;
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}
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return CPATH_JOIN_SUCCESS;
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}
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WpStr8 *dirup(const WpAllocator *allocator, WpStr8RO *path, u64 levels) {
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WpStr8 *output = NULL;
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if (!allocator || !path) {
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goto RETURN_DIRUP;
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}
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b8 absolute = wpStr8Get(path, 0) == WAPP_PATH_SEP;
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WpStr8 separator = wpStr8Buf(4);
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wpStr8PushBack(&separator, WAPP_PATH_SEP);
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if (path->size == 0) {
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output = wpStr8AllocBuf(allocator, 16);
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if (!output) {
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goto RETURN_DIRUP;
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}
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wpStr8PushBack(output, absolute ? WAPP_PATH_SEP : '.');
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goto RETURN_DIRUP;
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}
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if (levels < 1) {
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output = wpStr8AllocStr8(allocator, path);
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goto RETURN_DIRUP;
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}
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WpAllocator tmp_arena = wapp_mem_arena_allocator_init(MiB(8));
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if (wpMemAllocatorInvalid(&tmp_arena)) {
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goto RETURN_DIRUP;
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}
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WpStr8List *parts = wpStr8Split(&tmp_arena, path, &separator);
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if (!parts) {
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goto RETURN_DIRUP;
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}
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if (levels >= parts->node_count) {
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output = wpStr8AllocBuf(allocator, 16);
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if (!output) {
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goto LIST_CLEANUP_DIRUP;
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}
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wpStr8PushBack(output, absolute ? WAPP_PATH_SEP : '.');
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} else {
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for (u64 i = 0; i < levels; ++i) {
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wapp_dbl_list_pop_back(WpStr8, parts);
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}
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u64 alignment = sizeof(void *) * 2;
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u64 alloc_size = wpStr8ListTotalSize(parts) + parts->node_count * separator.size;
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u64 modulo = alloc_size & (alignment - 1);
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alloc_size += alignment - modulo;
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output = wpStr8AllocBuf(allocator, alloc_size);
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if (output) {
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if (absolute) {
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wpStr8PushBack(output, WAPP_PATH_SEP);
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}
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WpStr8 *joined = wpStr8Join(&tmp_arena, parts, &separator);
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if (joined) {
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wpStr8ConcatCapped(output, joined);
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}
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}
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}
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LIST_CLEANUP_DIRUP:
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wapp_mem_arena_allocator_destroy(&tmp_arena);
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RETURN_DIRUP:
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return output;
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}
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