What is the email subject length limit?

See RFC 2822, section 2.1.1 to start. There are two limits that this standard places on the number of characters in a line. Each line of characters MUST be no more than 998 characters, and SHOULD be no more than 78 characters, excluding the CRLF. As the RFC states later, you can work around this … Read more

Why does the 260 character path length limit exist in Windows?

Quoting this article https://docs.microsoft.com/en-us/windows/desktop/FileIO/naming-a-file#maximum-path-length-limitation Maximum Path Length Limitation In the Windows API (with some exceptions discussed in the following paragraphs), the maximum length for a path is MAX_PATH, which is defined as 260 characters. A local path is structured in the following order: drive letter, colon, backslash, name components separated by backslashes, and a terminating … Read more

How many levels of pointers can we have?

The C standard specifies the lower limit: 5.2.4.1 Translation limits 276 The implementation shall be able to translate and execute at least one program that contains at least one instance of every one of the following limits: […] 279 — 12 pointer, array, and function declarators (in any combinations) modifying an arithmetic, structure, union, or … Read more

How many files can I put in a directory?

FAT32: Maximum number of files: 268,173,300 Maximum number of files per directory: 216 – 1 (65,535) Maximum file size: 2 GiB – 1 without LFS, 4 GiB – 1 with NTFS: Maximum number of files: 232 – 1 (4,294,967,295) Maximum file size Implementation: 244 – 26 bytes (16 TiB – 64 KiB) Theoretical: 264 – 26 bytes (16 EiB – 64 KiB) Maximum volume size Implementation: 232 – 1 clusters (256 TiB – 64 KiB) Theoretical: 264 – 1 clusters (1 YiB – 64 KiB) ext2: Maximum number of files: 1018 … Read more

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