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MINOR: ist: add istadv() function

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The purpose of istadv() function is to move forward <.ptr> by <nb>
characters. It is very useful when parsing a payload.
This commit is contained in:
Baptiste Assmann 2020-03-29 08:10:16 +02:00 committed by Willy Tarreau
parent f11b1fb87f
commit 9ef1967af7
1 changed files with 11 additions and 0 deletions
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11
include/common/ist.h
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@ -740,6 +740,17 @@ static inline struct ist iststop(const struct ist ist, char chr)
return ist2(ist.ptr, len - 1); return ist2(ist.ptr, len - 1);
} }
/*
* advance <.ptr> by <nb> characters.
* If <ist> is too short, (ist.end,0) is returned.
*/
static inline struct ist istadv(const struct ist ist, const size_t nb)
{
if (ist.len < nb)
return ist2(ist.ptr + ist.len, 0);
return ist2(ist.ptr + nb, ist.len - nb);
}
#ifndef IST_FREESTANDING #ifndef IST_FREESTANDING
/* This function allocates <size> bytes and returns an `ist` pointing to /* This function allocates <size> bytes and returns an `ist` pointing to
* the allocated area with size `0`. * the allocated area with size `0`.