What Does Ap Stand For In Texting
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Does ap stand for argument pointer? Something else?
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It actually stands for "author [is] phossilized". Justifiable in code from the 1970's or before, but much harder to justify today. – Jerry Coffin Jun 21 '14 at 19:41
Does ap stand for argument pointer? could be. It's just a variable name, so it could stand for just about anything the author named it after. – P.P Jun 21 '14 at 19:42
Good one. Thanks for the style suggestion. – user3761340 Jun 21 '14 at 19:43
@JerryCoffin Are you saying we shouldn't use variable arguments in modern c? – this Jun 21 '14 at 19:44
@this Is that really what was inferred? :| – user2864740 Jun 21 '14 at 19:45
That's actually an easy question to answer.
From The C Programming Language, Second Edition, Brian W. Kernighan and Dennis M. Ritchie:
[...] The type va_list is used to declare a variable that will refer to each argument in turn; in minprintf, this variable is called ap, for "argument pointer"
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Good find! Chances are, Dennis Ritchie was the one who named that variable. – Sergey Kalinichenko Jun 21 '14 at 20:04
Good catch. It's still important to note that va_list is not necessarily a pointer type; it's a "pointer" only in an abstract sense. – Keith Thompson Jun 21 '14 at 20:21
ap stands for Argument Pointer. In fact, it is sometimes abbreviated as arg_ptr:
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Perhaps, but there's no support for that in the C standard or in the ANSI C Rationale. Both just use the name ap without explanation. It's also worth noting that va_list is not (necessarily) a pointer type. – Keith Thompson Jun 21 '14 at 19:51
@KeithThompson there is support in K&R2, see my answer – ouah Jun 21 '14 at 20:02
That's actually a difficult question to answer.
See ouah's answer; the phrase "argument pointer" is mentioned in K&R2.
The header was introduced by the ANSI C standard in 1989. The ANSI C Rationale doesn't show any examples, and doesn't use the name ap or arg_ptr. The standard itself (the latest draft is here uses the name ap in examples, but doesn't explain it.
I haven't been able to find an explanation of the name ap. It's plausible that it originally stood for "argument pointer", but it's also important to note that the type va_list is not (necessarily) a pointer type. In gcc, for example, it's defined as __builtin_va_list, a type that's implemented directly by the compiler. (It happens to have a size of 24 bytes on my system, but that's not particularly useful information).
Bottom line: The name ap is the conventional name for a va_list object, for no particular reason that we need to care about.
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What Does Ap Stand For In Texting
