initial

1 files changed, 86 insertions, 0 deletions

diff --git a/src/util.cc b/src/util.cc
new file mode 100644
index 0000000..baaaef3
--- /dev/null
+++ b/src/util.cc
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
+#include <string>
+#include <algorithm>
+#include <memory>
+#include <stdexcept>
+#include <cstdlib>
+#include <cxxabi.h>
+
+#include "util.h"
+
+bool is_numeric(const std::string& s) {
+    std::string::const_iterator it = s.begin();
+    while (it != s.end() && std::isdigit(*it)) ++it;
+    return !s.empty() && it == s.end();
+}
+
+bool is_date_valid(const int y, const int m, const int d) {
+    /* primitive out of range checks */
+    if (y < 2000 || y > 2099)
+        return false;
+
+    if (d < 1 || d > 31)
+        return false;
+
+    if (m < 1 || m > 12)
+        return false;
+
+    /* some more clever date validity checks */
+    if ((m == 4 || m == 6 || m == 9 || m == 11) && d == 31)
+        return false;
+
+    /* and finally a february check */
+    /* i always wondered, when do people born at feb 29 celebrate their bday? */
+    return m != 2 || ((y % 4 != 0 && d <= 28) || (y % 4 == 0 && d <= 29));
+}
+
+std::vector<std::string> split(const std::string& s, char separator) {
+    std::vector<std::string> output;
+    std::string::size_type prev_pos = 0, pos = 0;
+
+    while ((pos = s.find(separator, pos)) != std::string::npos) {
+        std::string substring(s.substr(prev_pos, pos-prev_pos));
+        output.push_back(substring);
+        prev_pos = ++pos;
+    }
+
+    output.push_back(s.substr(prev_pos, pos-prev_pos));
+
+    return output;
+}
+
+unsigned stou(const std::string& s) {
+    return static_cast<unsigned>(std::stoul(s));
+}
+
+unsigned short stouh(const std::string& s) {
+    return static_cast<unsigned short>(std::stoul(s));
+}
+
+bool string_has(std::string& s, char c) {
+    return s.find(c) != std::string::npos;
+}
+
+unsigned long hextoul(std::string& s) {
+    // strtol will store a pointer to first invalid character here
+    char* endptr = nullptr;
+
+    unsigned long n = strtol(s.c_str(), &endptr, 16);
+    if (*endptr != 0)
+        throw std::invalid_argument("input string is not a hex number");
+
+    return n;
+}
+
+// https://stackoverflow.com/questions/281818/unmangling-the-result-of-stdtype-infoname
+std::string demangle_type_name(const char* name) {
+    int status = -4; // some arbitrary value to eliminate the compiler warning
+
+    std::unique_ptr<char, void(*)(void*)> res {
+        abi::__cxa_demangle(name, nullptr, nullptr, &status),
+        std::free
+    };
+
+    return status == 0 ? res.get() : name;
+}
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