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docs: guard against NULL history.entries in README example #199

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docs: guard against NULL history.entries in README example #199

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5 changes: 3 additions & 2 deletions README.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -107,8 +107,9 @@ the ASDF tree, as well as extract block data. Inline comments provide further e
// This reads the top-level core/asdf-1.0.0 schema
err = asdf_get_meta(file, "/", &meta);
if (err == ASDF_VALUE_OK) {
if (meta->history.entries[0]) {
// This is a NULL-terminated array of asdf_history_entry_t*
// `entries` is NULL when the file has no history, and otherwise a
// NULL-terminated array of asdf_history_entry_t*, so check both.
if (meta->history.entries && meta->history.entries[0]) {
printf("first history entry: %s\n", meta->history.entries[0]->description);
}
}
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