71 lines
2.7 KiB
C++
71 lines
2.7 KiB
C++
#include "prx/libc/include/general/VabiMacros.hpp"
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#include <array>
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#include <cstddef>
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#include <cstdint>
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#include <cstdio>
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#include <cstring>
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#include <string>
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extern "C" int APS5_VABI sscanf_s_nid_postfix(const char*, const char*, ...);
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static int failures = 0;
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static void Require(bool condition, const char* message) {
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if (!condition) {
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std::fprintf(stderr, "%s\n", message);
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++failures;
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}
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}
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template<class TValue> static void CheckCount(const char* modifier, int count) {
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struct alignas(8) Destination {
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TValue value;
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std::array<unsigned char, 8> guard;
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} destination{static_cast<TValue>(-1), {}};
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destination.guard.fill(0xa5);
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const auto guard = destination.guard;
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const std::string input(static_cast<std::size_t>(count), 'x');
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const std::string format = input + "%" + modifier + "n";
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const int assigned = sscanf_s_nid_postfix(input.c_str(), format.c_str(), &destination.value);
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if (destination.value != count || destination.guard != guard || assigned != 0) {
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std::fprintf(stderr, "%%%sn after %d bytes: count=%lld, guard=%s, assignments=%d\n",
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modifier, count, static_cast<long long>(destination.value),
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destination.guard == guard ? "unchanged" : "overwritten", assigned);
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++failures;
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}
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}
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int main() {
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for (const int count : {0, 3, 127}) {
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CheckCount<signed char>("hh", count);
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CheckCount<short>("h", count);
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CheckCount<int>("", count);
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CheckCount<std::int64_t>("l", count);
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CheckCount<long long>("ll", count);
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CheckCount<std::intmax_t>("j", count);
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CheckCount<std::int64_t>("z", count);
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CheckCount<std::ptrdiff_t>("t", count);
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}
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CheckCount<short>("h", 257);
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CheckCount<std::int64_t>("l", 257);
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int number = -1;
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std::int64_t before = -1;
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std::int64_t after = -1;
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char word[4] = {};
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Require(sscanf_s_nid_postfix(" 12 abc!", "%ln%d %3[a-z]%jn!", &before, &number,
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word, 4u, &after) == 2, "Count conversions must not increase assignments");
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Require(before == 0 && number == 12 && std::strcmp(word, "abc") == 0 && after == 7,
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"Counts must include leading whitespace and earlier conversions");
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after = -1;
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Require(sscanf_s_nid_postfix("123x", "%*d%tn", &after) == 0 && after == 3,
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"Count must include suppressed input without consuming a capacity argument");
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after = -1;
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Require(sscanf_s_nid_postfix("x", "%d%lln", &number, &after) == 0 && after == -1,
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"Matching failure must leave a later count untouched");
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Require(sscanf_s_nid_postfix("", "%d%lln", &number, &after) == EOF && after == -1,
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"Input failure must leave a later count untouched");
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return failures == 0 ? 0 : 1;
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}
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