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Macro to make a ptrlen out of a string literal.

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I'm quite surprised I haven't needed this for anything else yet. I
suppose if I had it, I could have written most of my ptrlen_eq_strings
in terms of it, and saved a lot of gratuitous runtime strlens.
This commit is contained in:
Simon Tatham 2018-09-19 17:58:25 +01:00
parent a313048763
commit ce0b672e78
1 changed files with 6 additions and 0 deletions
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6
misc.h
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@ -107,6 +107,12 @@ int string_length_for_printf(size_t);
/* Derive two printf arguments from a ptrlen, suitable for "%.*s" */ /* Derive two printf arguments from a ptrlen, suitable for "%.*s" */
#define PTRLEN_PRINTF(pl) \ #define PTRLEN_PRINTF(pl) \
string_length_for_printf((pl).len), (const char *)(pl).ptr string_length_for_printf((pl).len), (const char *)(pl).ptr
/* Make a ptrlen out of a compile-time string literal. We try to
* enforce that it _is_ a string literal by token-pasting "" on to it,
* which should provoke a compile error if it's any other kind of
* string. */
#define PTRLEN_LITERAL(stringlit) \
TYPECHECK("" stringlit "", make_ptrlen(stringlit, sizeof(stringlit)-1))
/* Wipe sensitive data out of memory that's about to be freed. Simpler /* Wipe sensitive data out of memory that's about to be freed. Simpler
* than memset because we don't need the fill char parameter; also * than memset because we don't need the fill char parameter; also