How deeply does Modern C, Third Edition cover memcpy?

Defines the prototype, explicit length, and nonoverlap requirement, then demonstrates a complete program without descending into implementation internals.

Memcpy

As explained in Modern C, Third Edition

memcpy is a C standard-library function that copies a specified number of bytes from one nonoverlapping memory region to another.

memcpy copies exactly len bytes from source to target. Include <string.h>, provide distinct, nonoverlapping arrays, and ensure both regions can hold the requested length. section 6.1.5

Copying a program name

A small program computes argv[0]'s length with strlen, creates a len+1 character array, and calls memcpy(name, argv[0], len). The separate zero-initialized terminator lets strcmp confirm the copied text. section 6.1.5

TAKEAWAY rules:

Pass the copy length explicitly; memcpy does not determine a string length. section 6.1.5
Use memcpy for known array regions, while string functions handle zero-terminated strings and their string-specific rules. section 6.1.5

How Modern C, Third Edition covers it

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Related concepts

restrictuses · restrict is a C type qualifier that permits assumptions about exclusive, pointer-based access to an object during a computation.
memmovecontrasts with · memmove is a C standard-library function that copies a specified number of bytes between memory regions while correctly handling overlap.
ptr::copy_nonoverlappingequivalent to · ptr::copy_nonoverlapping is a Rust standard-library operation that copies a specified number of values between nonoverlapping memory regions.
copy_from_sliceused by · copy_from_slice is a Rust slice method that copies elements from a source slice into a destination slice of matching length.
generic atomic interfaceused by · A generic interface for atomic operations provided by the primary `std::atomic` class template.
strcpyalternative to · strcpy is a C standard-library function that copies a null-terminated source string, including its terminator, into destination storage.

This explainer was generated by Manning's knowledge graph from the text of Modern C, Third Edition. The section links point to the parts of the book it draws on.