From f6a144987cc403de8ad6bddd055f756120f8d405 Mon Sep 17 00:00:00 2001
From: Ethan Werner <mail@ethanwerner.com>
Date: Wed, 17 Apr 2024 16:00:00 -0700
Subject: archival commit

---
 include/flat.h | 120 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100755 include/flat.h

(limited to 'include/flat.h')

diff --git a/include/flat.h b/include/flat.h
new file mode 100755
index 0000000..17a1cc4
--- /dev/null
+++ b/include/flat.h
@@ -0,0 +1,120 @@
+// flat.h - Directory traversal utility functions
+
+#ifndef FLAT_H
+
+#include <stdint.h>
+#include <sys/stat.h>
+
+char *flat_path(int, ...);
+int64_t flat_directory_entry_count(char const *);
+char **flat_directory_entries(char const *);
+
+#define MKDIR(x) (mkdir(x, 0777))
+
+#endif // FLAT_H
+
+#ifdef FLAT_IMPLEMENTATION
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <dirent.h>
+
+char *flat_path(int s_n, ...) {
+  va_list list;
+  size_t c_n = 0;
+
+  if (s_n < 1)
+    return NULL;
+
+  // First, measure the total length required.
+  va_start(list, s_n);
+  for (int i = 0; i < s_n; i++) {
+    const char *s = va_arg(list, char *);
+    c_n += strlen(s);
+  }
+
+  va_end(list);
+
+  // Allocate return buffer.
+  char *r = malloc(c_n + 1);
+  if (r == NULL)
+    return NULL;
+
+  // Concatenate all the strings into the return buffer.
+  char *d = r;
+  va_start(list, s_n);
+
+  for (int i = 0; i < s_n; i++) {
+    const char *s = va_arg(list, char *);
+
+    // This loop is a strcpy.
+    while ((*d++ = *s++))
+      ;
+    d--;
+  }
+
+  va_end(list);
+  return r;
+}
+
+int64_t flat_directory_entry_count(char const *path) {
+  DIR *dir;
+  struct dirent *ent;
+
+  if (!(dir = opendir(path))) {
+    return 0;
+  }
+  int64_t n = 0;
+
+  while ((ent = readdir(dir))) {
+    if (!strcmp(ent->d_name, "."))
+      continue;
+
+    if (!strcmp(ent->d_name, ".."))
+      continue;
+
+    n++;
+  }
+
+  closedir(dir);
+
+  return n;
+}
+
+char **flat_directory_entries(char const *path) {
+  int64_t n = flat_directory_entry_count(path);
+  char **entries = calloc(n + 1, sizeof(char **));
+
+  DIR *dir;
+  struct dirent *ent;
+
+  int64_t i = 0;
+  int64_t entry_n = 0;
+
+  if (!(dir = opendir(path))) {
+    return NULL;
+  }
+  while (i < n) {
+    ent = readdir(dir);
+
+    if (!strcmp(ent->d_name, "."))
+      continue;
+
+    if (!strcmp(ent->d_name, ".."))
+      continue;
+
+    entry_n = strlen(ent->d_name);
+    entries[i] = malloc(entry_n + 1);
+    strcpy(entries[i], ent->d_name);
+
+    i++;
+  }
+
+  closedir(dir);
+
+  return entries;
+}
+
+#endif // FLAT_IMPELEMTATION
-- 
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