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xsnprintf: various improvements related to xvsnprintf() and xsnprintf()

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Summary of changes:

* Make xvsnprintf() static
* restrict-qualify pointer arguments (as done by the libc equivalents)
* Make comments and spec references more thorough
* Remove pointless `n <= INT_MAX` assertion (see comment)
* Use FATAL_ERROR() instead of xassert() (since the assertion is inside
  a shared util function but the caller is responsible for ensuring the
  condition holds true)
* Change some callers to use size_t instead of int for the return value
  (negative returns are impossible and all subsequent uses are size_t)

The updated comments and code were taken (and adapted) from:

49260bb154/src/util/xsnprintf.c (L6-50)

This work was entirely authored by me and I hereby license this
contribution under the MIT license (stated explicitly, so that
there's no ambiguity w.r.t. the original license).
This commit is contained in:
Craig Barnes 2024-09-11 20:13:30 +01:00 • committed by Daniel Eklöf
parent 31f88e636c
commit d4a1283797
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8 changed files with 54 additions and 35 deletions
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3
xsnprintf.h
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@ -4,5 +4,4 @@
#include <stddef.h>
#include "macros.h"
size_t xsnprintf(char *buf, size_t len, const char *fmt, ...) PRINTF(3) NONNULL_ARGS;
size_t xvsnprintf(char *buf, size_t len, const char *fmt, va_list ap) VPRINTF(3) NONNULL_ARGS;
size_t xsnprintf(char *restrict buf, size_t n, const char *restrict format, ...) PRINTF(3) NONNULL_ARGS;