From 75ea20675d012e692996bc6beae9149b0deb08b0 Mon Sep 17 00:00:00 2001 From: Leah Neukirchen Date: Fri, 5 Nov 2021 18:52:11 +0100 Subject: initial commit --- steprn.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 steprn.c (limited to 'steprn.c') diff --git a/steprn.c b/steprn.c new file mode 100644 index 0000000..2ca0a27 --- /dev/null +++ b/steprn.c @@ -0,0 +1,23 @@ +#include +#include + +char * +steprn(char *dst, char *end, const char *fmt, ...) +{ + if (dst >= end) + return end; + + va_list ap; + va_start(ap, fmt); + int r = vsnprintf(dst, end - dst, fmt, ap); + va_end(ap); + + if (r < 0) { + /* snprintf only fails for silly reasons: + truncate what was written, behave as noop. */ + *dst = 0; + return dst; + } + + return r > end - dst ? end : dst + r; +} -- cgit 1.4.1