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string -> integer implementation

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Allen Webster
2021-03-14 17:35:12 -07:00
parent 084d55d55d
commit 30b8466a12
1 changed files with 54 additions and 25 deletions
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source/md_impl.c
+32 -3
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@@ -485,9 +485,38 @@ MD_JoinStringListWithSeparator(MD_String8List list, MD_String8 separator)
MD_FUNCTION_IMPL MD_i64 MD_FUNCTION_IMPL MD_i64
MD_I64FromString(MD_String8 string, MD_u32 radix) MD_I64FromString(MD_String8 string, MD_u32 radix)
{ {
char str[64]; MD_Assert(2 <= radix && radix <= 16);
_MD_WriteStringToBuffer(string, sizeof(str), str);
return strtoll(str, 0, radix); static MD_u8 char_to_value[] = {
0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,
0x08,0x09,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
};
// get the sign
MD_i64 sign = +1;
MD_u64 i = 0;
if (string.size > 0){
if (string.str[i] == '-'){
i = 1;
sign = -1;
}
if (string.str[i] == '+'){
i = 1;
}
}
// get the value
MD_i64 value = 0;
for (;i < string.size; i += 1){
value *= radix;
MD_u8 c = string.str[i];
value += char_to_value[(c - 0x30)&0x1F];
}
value *= sign;
return(value);
} }
MD_FUNCTION_IMPL MD_f64 MD_FUNCTION_IMPL MD_f64