documentation server and /doc route

Signed-off-by: ngn <ngn@ngn.tf>

doc/src/util.c

@@ -0,0 +1,125 @@
+#include <linux/limits.h>
+#include <ctorm/ctorm.h>
+
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#include <stdint.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "util.h"
+
+uint64_t util_endswith(char *str, char *suf) {
+  if (NULL == str || NULL == suf) {
+    errno = EINVAL;
+    return false;
+  }
+
+  uint64_t sufl = strlen(suf);
+  uint64_t strl = strlen(str);
+
+  if (sufl > strl)
+    return false;
+
+  uint64_t indx = strl - sufl;
+
+  return strncmp(str + indx, suf, sufl) == 0 ? indx : 0;
+}
+
+void util_send(ctorm_res_t *res, uint16_t code, cJSON *json) {
+  if (NULL == json)
+    json = cJSON_CreateObject();
+  const char *error = "";
+
+  switch (code) {
+  case 404:
+    error = "not found";
+    break;
+
+  case 400:
+    error = "bad request";
+    break;
+
+  case 500:
+    error = "internal server error";
+    break;
+  }
+
+  if (*error != 0)
+    cJSON_AddStringToObject(json, "error", error);
+
+  RES_JSON(json);
+}
+
+bool util_dir_contains(char *dir, const char *file) {
+  if (NULL == dir || NULL == file) {
+    errno = EINVAL;
+    return false;
+  }
+
+  struct dirent *dirent = NULL;
+  DIR           *dirfd  = NULL;
+
+  if (NULL == (dirfd = opendir(dir)))
+    return false; // errno set by opendir
+
+  while ((dirent = readdir(dirfd)) != NULL) {
+    if (util_compare_name(dirent->d_name, ".") || util_compare_name(dirent->d_name, ".."))
+      continue;
+
+    if (util_compare_name(dirent->d_name, file))
+      break;
+  }
+
+  closedir(dirfd);
+  return NULL != dirent;
+}
+
+util_file_t *util_file_load(char *path) {
+  if (NULL == path) {
+    errno = EINVAL;
+    return NULL;
+  }
+
+  util_file_t *file = NULL;
+  struct stat  buf;
+  int          fd = -1;
+
+  if (NULL == (file = malloc(sizeof(util_file_t))))
+    goto end; // errno set by malloc
+
+  if ((fd = open(path, O_RDONLY)) < 0)
+    goto end; // errno set by open
+
+  if (fstat(fd, &buf) < 0)
+    goto end; // errno set by fstat
+
+  if (NULL == (file->content = mmap(0, (file->size = buf.st_size), PROT_READ, MAP_PRIVATE, fd, 0)))
+    goto end; // errno set by mmap
+
+end:
+  if (fd != -1)
+    close(fd);
+
+  if (NULL == file->content) {
+    free(file);
+    return NULL;
+  }
+
+  return file;
+}
+
+void util_file_free(util_file_t *file) {
+  if (NULL == file)
+    return;
+
+  munmap(file->content, file->size);
+  free(file);
+}