4f9d991449
History squashed from internal development. Internal history has commit hash: e27a0e485c44a5003a802de2661ce3b21e120316
92 lines
1.5 KiB
C++
92 lines
1.5 KiB
C++
#pragma once
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#include <cstdint>
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#include <cstdlib>
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#include <cstring>
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#include <type_traits>
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namespace opt
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{
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class Opt
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{
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private:
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int argc;
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char** argv;
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public:
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Opt(int argc, char** argv) : argc(argc), argv(argv) {}
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bool has(const char* opt)
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{
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for (int i = 1; i < argc; i++)
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{
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if (!strcmp(opt, argv[i]))
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return true;
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}
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return false;
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}
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template<class T>
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T is(const char* opt, T def)
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{
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size_t len = strlen(opt);
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for (int i = 1; i < argc; i++)
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{
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const char* p = param(opt, len, i);
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if (p != nullptr)
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{
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char* end = nullptr;
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T r;
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if (std::is_unsigned<T>::value)
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r = (T)strtoull(p, &end, 10);
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else
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r = (T)strtoll(p, &end, 10);
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if ((r == 0) && (end == p))
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return def;
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return r;
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}
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}
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return def;
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}
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const char* is(const char* opt, const char* def)
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{
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size_t len = strlen(opt);
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for (int i = 1; i < argc; i++)
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{
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const char* p = param(opt, len, i);
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if (p != nullptr)
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return p;
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}
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return def;
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}
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private:
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const char* param(const char* opt, size_t len, int i)
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{
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if (strncmp(opt, argv[i], len))
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return nullptr;
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switch (argv[i][len])
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{
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case '\0':
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return (i < (argc - 1)) ? argv[i + 1] : nullptr;
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case '=':
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return &argv[i][len + 1];
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default:
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return nullptr;
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}
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}
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};
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}
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