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278

util: Add a comment explaining EXPAND_TO_FIT


jcs made amendment 278 2 months ago
--- util.h Thu Sep 8 21:52:06 2022 +++ util.h Fri Nov 11 16:57:46 2022 @@ -34,6 +34,11 @@ #define MAX(a, b) ((a) > (b) ? (a) : (b)) #define BOUND(a, min, max) ((a) > (max) ? (max) : ((a) < (min) ? (min) : (a))) +/* + * If var of var_size (of which used_size is used) is not big enough to + * hold add, expand it by grow_amount (to give headroom for subsequent + * expansion). + */ #define EXPAND_TO_FIT(var, var_size, used_size, add, grow_amount) { \ if ((used_size) + (add) >= (var_size)) { \ while ((used_size) + (add) >= (var_size)) { \