dirent VS Lua

#include #include #include #include #include #include #include typedef struct file_info { char *path; // ToDo: more info in the future } file_info; // Function prototypes bool is_special_file(const char *file); file_info **find_all_files(const char *root_dir); int find_files(const char *dir_path, file_info ***files, int *cap, int *cnt); file_info *file_info_new(const char *path); int main(int argc, char **argv) { find_all_files("/tmp/test"); // ToDo: Free all the memory correctly return 0; } file_info *file_info_new(const char *path) { file_info *file = malloc(sizeof(file_info)); if (!file) return NULL; file->path = path; return file; } file_info **find_all_files(const char *root_dir) { file_info **files = malloc(sizeof(file_info *)); int capacity = 1; int count = 0; int result = find_files(root_dir, &files, &capacity, &count); printf("Array cap: %d\n", capacity); printf("Array count: %d\n", count); printf("-------------------\n"); for (int i = 0; i < count; i++) { printf("%s\n", files[i]->path); } return files; } // Based on the implementation from https://github.com/tronkko/dirent int find_files(const char *dir_path, file_info ***files, int *cap, int *cnt) { char buffer[PATH_MAX + 2]; char *p = buffer; char *end = &buffer[PATH_MAX]; // Copy directory name to buffer const char *src = dir_path; while (p < end && *src != '\0') { *p++ = *src++; } *p = '\0'; // Open directory stream DIR *dir_stream = opendir(dir_path); if (!dir_stream) { printf("Failed to open %s (%s)\n", dir_path, strerror(errno)); return -1; } // Iterate all files/directories within the directory struct dirent *ent; while ((ent = readdir(dir_stream)) != NULL) { char *q = p; char c; // Get final character of directory name if (buffer < q) c = q[-1]; else c = ':'; // Append directory separator if not already there if (c != ':' && c != '/' && c != '\\') *q++ = '/'; // Append file name to current directory path src = ent->d_name; while (q < end && *src != '\0') { *q++ = *src++; } *q = '\0'; // Resize array if needed if (*cnt == *cap) { int realloc_size = (*cap) * 2; file_info **tmp_files = realloc(*files, realloc_size * sizeof(file_info *)); if (!tmp_files) exit(1); *cap *= 2; *files = tmp_files; } // Process every dirent type switch (ent->d_type) { case DT_LNK: { printf("[LINK] %s\n", buffer); (*files)[*cnt] = file_info_new(buffer); (*cnt)++; break; } case DT_REG: { printf("[FILE] %s\n", buffer); (*files)[*cnt] = file_info_new(buffer); (*cnt)++; break; } case DT_DIR: { if (!is_special_file(ent->d_name)) { printf("[DIR] %s\n", buffer); (*files)[*cnt] = file_info_new(buffer); (*cnt)++; find_files(buffer, files, cap, cnt); } break; } default: break; } } return 0; } bool is_special_file(const char *file) { if (strcmp(file, ".") != 0 && strcmp(file, "..") != 0) return false; return true; }

Thanks for the reply. Yea, I wonder how I would go about implementing an iterative approach tho. I am currently working with the following implementation: https://github.com/tronkko/dirent/blob/master/include/dirent.h

You can use dirent for both if you include a compatibility shim for windows.

dirent

The EventSource uses the Lua language to search for any services with ports set to 80 or 443 in the ‘argocd’ namespace. More examples can be found here.

If you're new to the 12 in 24 series, I'm learning and building projects with a new programming language every month - this month, it's the Lua scripting language. You can find source code for the projects I build in the official GitHub repository (check it out, this week's folder contains code for both this and two other bonus projects!).

This month, we're talking about Lua. It's not always a first choice when it comes to programming, but I think there's a lot to enjoy about this little language. Heck, I'm a big game development fan myself - I would look into it even if that was the only reason to.

It’s Portuguese. It’s the same in the Lua codebase [1].

[1]: https://github.com/lua/lua

If we think we need more flexibility for processing records, we can write our own embedded filters using Lua language. Lua is a highly efficient programming language used mainly for embedded scripting.

Lua

➜ ~ brew info lua ==> lua: stable 5.4.6 (bottled) Powerful, lightweight programming language https://www.lua.org/ /opt/homebrew/Cellar/lua/5.4.6 (29 files, 788.7KB) * Poured from bottle using the formulae.brew.sh API on 2023-05-16 at 11:03:06 From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/l/lua.rb License: MIT ==> Caveats You may also want luarocks: brew install luarocks ==> Analytics install: 16,599 (30 days), 56,745 (90 days), 139,027 (365 days) install-on-request: 1,763 (30 days), 6,266 (90 days), 21,105 (365 days) build-error: 0 (30 days)

I think Lua is a good example of doing documentation well. The source code is commented only as much as needed, mainly with brief comments about things that might not be obvious and a small number of longer explanations of how the architecture works (mainly relevant to developers). It also has a super nice feature that's surprisingly rare: each file has a very short line at the top that describes what the file is, so you don't have to guess based on the filename alone. The API is documented in a single HTML file on the website that has both the high level descriptions of the language and architecture, as well as documentation for each public-facing function. The docs are maintained by hand, but the API is mostly stable, so the docs don't need to change very often.

This is using the Lua language and the Solar2d game framework