Add timespec_{read,write}_file() and unit tests

src/timespec.c

@@ -250,3 +250,83 @@ bool timespec_get_spec(struct mgos_timespec *ts, char *ret, int retlen) {
   }
   return true;
 }
+
+bool timespec_write_file(struct mgos_timespec *ts, const char *fn) {
+  char buf[500];
+  int  fd;
+
+  if (!timespec_get_spec(ts, buf, sizeof(buf))) {
+    LOG(LL_ERROR, ("Could not convert timespec to string"));
+    return false;
+  }
+
+  if (!fn) {
+    return false;
+  }
+
+  if (!(fd = open(fn, O_RDWR | O_CREAT | O_TRUNC))) {
+    LOG(LL_ERROR, ("Could not open %s for writing", fn));
+    return false;
+  }
+  if ((uint32_t)strlen(buf) != (uint32_t)write(fd, buf, strlen(buf))) {
+    LOG(LL_ERROR, ("Short write on %s for data '%s'", fn, buf));
+    return false;
+  }
+  close(fd);
+
+  return true;
+}
+
+bool timespec_read_file(struct mgos_timespec *ts, const char *fn) {
+  int         fd;
+  char *      buf;
+  char *      spec;
+  char *      buf_ptr;
+  struct stat fp_stat;
+
+  if (!ts) {
+    return false;
+  }
+
+  if (!fn) {
+    return false;
+  }
+
+  if (0 != stat(fn, &fp_stat)) {
+    LOG(LL_ERROR, ("Could not stat %s", fn));
+  }
+  if (fp_stat.st_size > 1024) {
+    LOG(LL_ERROR, ("File size of %s is larger than 1024 bytes (%u)", fn, (uint32_t)fp_stat.st_size));
+  }
+  buf = malloc(fp_stat.st_size + 1);
+  if (!buf) {
+    LOG(LL_ERROR, ("Could not malloc %u bytes for file %s", (uint32_t)fp_stat.st_size, fn));
+  }
+
+  if (!(fd = open(fn, O_RDONLY))) {
+    LOG(LL_ERROR, ("Could not open %s for reading", fn));
+    free(buf);
+    return false;
+  }
+  if (fp_stat.st_size != read(fd, buf, fp_stat.st_size)) {
+    LOG(LL_ERROR, ("Could not read %u bytes from %s", (uint32_t)fp_stat.st_size, fn));
+    close(fd);
+    free(buf);
+    return false;
+  }
+  buf[fp_stat.st_size] = '\0';
+  close(fd);
+  LOG(LL_INFO, ("buf='%s'", buf));
+
+  // Wipe the timespec and parse back
+  timespec_clear_spec(ts);
+
+  buf_ptr = buf;
+  while ((spec = strtok_r(buf_ptr, ",", &buf_ptr))) {
+    if (!timespec_add_spec(ts, spec)) {
+      LOG(LL_WARN, ("Could not add spec '%s'", spec));
+    }
+  }
+  free(buf);
+  return true;
+}