66 lines
1.2 KiB
C++
66 lines
1.2 KiB
C++
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#include <cstring>
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struct String_Buffer
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{
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char* str;
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int cap;
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int len = 0;
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};
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namespace fmt
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{
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void write(String_Buffer& buf, const char* str, int len)
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{
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int remaining_cap = buf.cap - buf.len - 1; // leave one byte for NUL
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int write_len = len > remaining_cap ? remaining_cap : len;
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if (write_len > 0)
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memcpy(buf.str + buf.len, str, write_len);
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buf.len += len;
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}
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void write_value(String_Buffer& buf, const char* value)
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{
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write(buf, value, strlen(value));
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}
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bool next_hole(String_Buffer& buf, const char*& fstr)
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{
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const char* prefix = fstr;
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while (*fstr != 0) {
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if (*fstr == '{') {
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int len = fstr - prefix;
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++fstr;
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if (*fstr == '}') {
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++fstr;
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write(buf, prefix, len);
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return true;
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}
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if (*fstr == '{') {
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write(buf, prefix, len);
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prefix = fstr;
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++fstr;
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}
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}
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++fstr;
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}
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write(buf, prefix, fstr - prefix);
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return false;
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}
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template<typename T>
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void format_value(String_Buffer& buf, const char*& fstr, const T& value)
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{
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if (next_hole(buf, fstr))
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write_value(buf, value);
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}
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template<typename... Args>
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void format(String_Buffer& buf, const char* fstr, const Args&... args)
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{
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(format_value(buf, fstr, args), ...);
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while (next_hole(buf, fstr)) {}
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}
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}
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