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+.TH LIBABORT_VSAPRINTF 3 LIBABORT
+.SH NAME
+libabort_vsaprintf \- Format a string with bounds checking
+
+.SH SYNOPSIS
+.nf
+#include <libabort.h>
+
+int \fBlibabort_vsaprintf\fP(char *\fIbuf\fP, size_t \fIsize\fP, const char *\fIfmt\fP, va_list \fIap\fP);
+
+#if !defined(LIBABORT_NO_SHORTHANDS) && !defined(vsaprintf)
+# define \fBvsaprintf\fP libabort_vsaprintf
+#endif
+.fi
+.PP
+Link with
+.IR -labort .
+
+.SH DESCRIPTION
+The
+.BR libabort_vsaprintf ()
+function formats a string according to
+.I fmt
+into the buffer
+.IR buf ,
+which is assumed to be
+.I size
+bytes long.
+.PP
+If the formatted output does not fit in the destination buffer
+(including the terminating NUL byte), or if
+.I size
+is zero, the
+.BR libabort_vsaprintf ()
+function calls
+.BR abort (3).
+
+.SH RETURN VALUE
+The
+.BR libabort_vsaprintf ()
+function returns the number of bytes written to
+.IR buf ,
+excluding the terminating NUL byte.
+
+.SH ERRORS
+The
+.BR libabort_vsaprintf ()
+function cannot fail.
+
+.SH HISTORY
+The
+.BR libabort_vsaprintf ()
+function added in version 1.0 of
+.BR libabort .
+
+.SH SEE ALSO
+.BR libabort (7),
+.BR libabort_saprintf (3)