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support unit int string for -b -o -s -c option.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| #pragma once | ||
|
|
||
| #include <string> | ||
| #include <cstdio> | ||
| #include <cstdlib> | ||
| #include <exception> | ||
| #include <cinttypes> | ||
|
|
||
| /** | ||
| * Formst string with va_list. | ||
| */ | ||
| inline std::string formatStringV(const char *format, va_list ap) | ||
| { | ||
| char *p = nullptr; | ||
| int ret = ::vasprintf(&p, format, ap); | ||
| if (ret < 0) throw std::runtime_error("vasprintf failed."); | ||
| try { | ||
| std::string s(p, ret); | ||
| ::free(p); | ||
| return s; | ||
| } catch (...) { | ||
| ::free(p); | ||
| throw; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Create a std::string using printf() like formatting. | ||
| */ | ||
| inline std::string formatString(const char * format, ...) | ||
| { | ||
| std::string s; | ||
| std::exception_ptr ep; | ||
| va_list args; | ||
| va_start(args, format); | ||
| try { | ||
| s = formatStringV(format, args); | ||
| } catch (...) { | ||
| ep = std::current_exception(); | ||
| } | ||
| va_end(args); | ||
| if (ep) std::rethrow_exception(ep); | ||
| return s; | ||
| } | ||
|
|
||
| /** | ||
| * Convert size string with unit suffix to unsigned integer. | ||
| */ | ||
| inline uint64_t fromUnitIntString(const std::string &valStr) | ||
| { | ||
| if (valStr.empty()) { | ||
| throw std::runtime_error("fromUnitIntString: invalid argument."); | ||
| } | ||
| char *endp; | ||
| uint64_t val = ::strtoll(valStr.c_str(), &endp, 10); | ||
| int shift = 0; | ||
| switch (*endp) { | ||
| case 'e': case 'E': shift = 60; break; | ||
| case 'p': case 'P': shift = 50; break; | ||
| case 't': case 'T': shift = 40; break; | ||
| case 'g': case 'G': shift = 30; break; | ||
| case 'm': case 'M': shift = 20; break; | ||
| case 'k': case 'K': shift = 10; break; | ||
| case '\0': break; | ||
| default: | ||
| throw std::runtime_error("fromUnitIntString: invalid suffix charactor."); | ||
| } | ||
| if (((val << shift) >> shift) != val) { | ||
| throw std::runtime_error("fromUnitIntString: overflow."); | ||
| } | ||
| return val << shift; | ||
| } | ||
|
|
||
| /** | ||
| * Unit suffixes: | ||
| * k: 2^10 | ||
| * m: 2^20 | ||
| * g: 2^30 | ||
| * t: 2^40 | ||
| * p: 2^50 | ||
| * e: 2^60 | ||
| */ | ||
| inline std::string toUnitIntString(uint64_t val) | ||
| { | ||
| uint64_t mask = (1ULL << 10) - 1; | ||
| const char units[] = " kmgtpezy"; | ||
|
|
||
| size_t i = 0; | ||
| while (i < sizeof(units)) { | ||
| if ((val & ~mask) != val) { break; } | ||
| i++; | ||
| val >>= 10; | ||
| } | ||
|
|
||
| if (0 < i && i < sizeof(units)) { | ||
| return formatString("%" PRIu64 "%c", val, units[i]); | ||
| } else { | ||
| return formatString("%" PRIu64 "", val); | ||
| } | ||
| } |