Merge pull request #59 from JuliaString/spj/tests

Update requirements, make work on v1.4 of Julia, improve tests

Author: ScottPJones

Project.toml

@@ -36,4 +36,4 @@ Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
 test = ["Test", "Random", "Printf"]
 
 [compat]
-julia = "1.6"
+julia = "1.4"

src/printf.jl

@@ -430,9 +430,16 @@ function _get_strspec(spec)
     _strspec[spec] = string(spec; modifier="R")
 end
 
+@static if VERSION < v"1.5"
+_snprintf(ptr, siz, spec, arg) =
+    ccall((:mpfr_snprintf,:libmpfr), Int32,
+          (Ptr{UInt8}, Culong, Ptr{UInt8}, Ref{BigFloat}...),
+          ptr, siz, spec, arg)
+else
 _snprintf(ptr, siz, spec, arg) =
     @ccall "libmpfr".mpfr_snprintf(ptr::Ptr{UInt8}, siz::Csize_t, spec::Ptr{UInt8};
                                    arg::Ref{BigFloat})::Cint
+end
 
 function _fmt(buf, pos, spec::FmtSpec{<:FmtFlts}, arg::BigFloat)
     isfinite(arg) || return _fmt(buf, pos, spec, Float64(arg))