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#include <stdarg.h>
#include <stdio.h>
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;
}
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