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ta: document funny macros

This commit is contained in:
wm4 2019-12-28 21:02:51 +01:00
parent e2c6919da0
commit 65337c032f
1 changed files with 10 additions and 0 deletions
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10
ta/ta_talloc.h
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@ -82,14 +82,18 @@ char *ta_talloc_asprintf_append_buffer(char *s, const char *fmt, ...) TA_PRF(2,
#define TA_EXPAND_ARGS(...) __VA_ARGS__
// Return number of allocated entries in typed array p[].
#define MP_TALLOC_AVAIL(p) (talloc_get_size(p) / sizeof((p)[0]))
// Resize array p so that p[count-1] is the last valid entry. ctx as ta parent.
#define MP_RESIZE_ARRAY(ctx, p, count) \
do { \
(p) = ta_xrealloc_size(ctx, p, \
ta_calc_array_size(sizeof((p)[0]), count)); \
} while (0)
// Resize array p so that p[nextidx] is accessible. Preallocate additional
// space to make appending more efficient, never shrink. ctx as ta parent.
#define MP_TARRAY_GROW(ctx, p, nextidx) \
do { \
size_t nextidx_ = (nextidx); \
@ -97,6 +101,8 @@ char *ta_talloc_asprintf_append_buffer(char *s, const char *fmt, ...) TA_PRF(2,
MP_RESIZE_ARRAY(ctx, p, ta_calc_prealloc_elems(nextidx_)); \
} while (0)
// Append the last argument to array p (with count idxvar), basically:
// p[idxvar++] = ...; ctx as ta parent.
#define MP_TARRAY_APPEND(ctx, p, idxvar, ...) \
do { \
MP_TARRAY_GROW(ctx, p, idxvar); \
@ -104,6 +110,9 @@ char *ta_talloc_asprintf_append_buffer(char *s, const char *fmt, ...) TA_PRF(2,
(idxvar)++; \
} while (0)
// Insert the last argument at p[at] (array p with count idxvar), basically:
// for(idxvar-1 down to at) p[n+1] = p[n]; p[at] = ...; idxvar++;
// ctx as ta parent. Required: at >= 0 && at <= idxvar.
#define MP_TARRAY_INSERT_AT(ctx, p, idxvar, at, ...)\
do { \
size_t at_ = (at); \
@ -115,6 +124,7 @@ char *ta_talloc_asprintf_append_buffer(char *s, const char *fmt, ...) TA_PRF(2,
(p)[at_] = (TA_EXPAND_ARGS(__VA_ARGS__)); \
} while (0)
// Remove p[at] from array p with count idxvar (inverse of MP_TARRAY_INSERT_AT()).
// Doesn't actually free any memory, or do any other talloc calls.
#define MP_TARRAY_REMOVE_AT(p, idxvar, at) \
do { \