prosody
d5360307a99d
util/format.lua

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util/format.lua @ 11568:d5360307a99d

mod_http_file_share: Handle out of bounds Range request Turns out you can seek past the end of the file without getting an error. Also rejects empty range instead of sending the whole file.
author Kim Alvefur <zash@zash.se>
date Mon, 17 May 2021 14:14:25 +0200
parent 10035:386f085820e6
child 11638:5f4a657136bc
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70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
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1 --
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2 -- A string.format wrapper that gracefully handles invalid arguments
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3 --
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4
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5 local tostring = tostring;
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6 local unpack = table.unpack or unpack; -- luacheck: ignore 113/unpack
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7 local pack = require "util.table".pack; -- TODO table.pack in 5.2+
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8 local type = type;
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9 local dump = require "util.serialization".new("debug");
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10 local num_type = math.type or function (n)
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11 return n % 1 == 0 and n <= 9007199254740992 and n >= -9007199254740992 and "integer" or "float";
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12 end
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13
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14 -- In Lua 5.3+ these formats throw an error if given a float
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15 local expects_integer = { c = true, d = true, i = true, o = true, u = true, X = true, x = true, };
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16
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17 local function format(formatstring, ...)
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18 local args = pack(...);
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19 local args_length = args.n;
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20
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21 -- format specifier spec:
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22 -- 1. Start: '%%'
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23 -- 2. Flags: '[%-%+ #0]'
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24 -- 3. Width: '%d?%d?'
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25 -- 4. Precision: '%.?%d?%d?'
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26 -- 5. Option: '[cdiouxXaAeEfgGqs%%]'
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27 --
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28 -- The options c, d, E, e, f, g, G, i, o, u, X, and x all expect a number as argument, whereas q and s expect a string.
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29 -- This function does not accept string values containing embedded zeros, except as arguments to the q option.
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30 -- a and A are only in Lua 5.2+
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32
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33 -- process each format specifier
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34 local i = 0;
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35 formatstring = formatstring:gsub("%%[^cdiouxXaAeEfgGqs%%]*[cdiouxXaAeEfgGqs%%]", function(spec)
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36 if spec ~= "%%" then
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37 i = i + 1;
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38 local arg = args[i];
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39
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40 local option = spec:sub(-1);
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41 if arg == nil then
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42 args[i] = "nil";
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43 spec = "<%s>";
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44 elseif option == "q" then
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45 args[i] = dump(arg);
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46 spec = "%s";
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47 elseif option == "s" then
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48 args[i] = tostring(arg);
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49 elseif type(arg) ~= "number" then -- arg isn't number as expected?
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50 args[i] = tostring(arg);
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51 spec = "[%s]";
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52 elseif expects_integer[option] and num_type(arg) ~= "integer" then
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53 args[i] = tostring(arg);
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54 spec = "[%s]";
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55 end
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56 end
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57 return spec;
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58 end);
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59
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60 -- process extra args
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61 while i < args_length do
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62 i = i + 1;
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63 local arg = args[i];
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64 if arg == nil then
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65 args[i] = "<nil>";
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66 else
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67 args[i] = tostring(arg);
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68 end
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69 formatstring = formatstring .. " [%s]"
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70 end
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71
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72 return formatstring:format(unpack(args));
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73 end
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74
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75 return {
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76 format = format;
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77 };