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contributing: add safety section
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@ -237,6 +237,15 @@ used and `#undef` them after.
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* Document the contents and container of a `struct wl_list` with a
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`// content.link` and `// container.list` comment.
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### Safety
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* Avoid string manipulation functions which don't take the size of the
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destination buffer as input: for instance, prefer `snprintf` over `sprintf`.
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* Avoid repeating type names in `sizeof()` where possible. For instance, prefer
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`ptr = calloc(1, sizeof(*ptr))` over `ptr = calloc(1, sizeof(struct foo))`.
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* Prefer `*ptr = (struct foo){0}` over `memset(ptr, 0, sizeof(*ptr))`.
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* Prefer `*foo = *bar` over `memcpy(foo, bar, sizeof(*foo))`.
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### Example
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```c
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