STRPERM(3)

🎀 NAME 🎀

strperm — evaluate file permission expression 💅

This is the STRPERM(3) page from the Library Functions Manual, bestie. We're doing file permission expressions today, and yes, it's giving low-level but make it cute. ✨

🌸 SYNOPSIS 🌸

int strperm(char* s, char** e, int p)

💖 DESCRIPTION 💖

Okay bestie, so strperm applies a file permission expression in the nul-terminated string s to the initial file permission mask p. It returns the new permission mask — periodt. If e is not 0, then *e is set to point to the first unrecognized character in s — literally the first "wait, what?" character. 👀

A tape device specification is composed of one or more who-op-permission terms separated by ,. (Yes, tape device specification — that's the wording, iykyk. We keep the lore.) The who selects portions of the permission bits and may be any combination of:

• u — the user permission bits;
• g — the group permission bits;
• o — the other permission bits;
• a — all permission bits.

If who is omitted, all permission bits are selected. The op specifies how the original permission p is to be modified:

• + — | the new bits are set in p;
• - — the new bits are cleared in p;
• & — the new bits are and'd with p;
• = — the select bits in p are set equal to the new bits.

A permission expression term may also be an octal number. Octal specifications are inherently non-portable — no cap, that's just the truth. Refer to chmod(1) for an explanation of this form. 🫶

🦋 SEE ALSO 🦋

chmod(1), ls(1), strmode(3)

Catch you later, bestie — this was STRPERM(3) 💖✨ The footer didn't give us a source/version or date, so that's the whole tea: just STRPERM(3), and we're out. 🎀