// // EngNotation.h // EngineeringNotationFormatter // // Copyright (C) 2005-2009 by Jukka Korpela // Copyright (C) 2009-2013 by David Hoerl // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. // #ifndef EngineeringNotationFormatter_EngNotation_h #define EngineeringNotationFormatter_EngNotation_h enum { eng_prefixed=0, eng_exponential }; // converts a double to the specified number of digits, in either SI or exponential notation. The return string must be free()'d char *to_engineering_string(char *buf, ptrdiff_t buf_size, double value, unsigned int digits, /* bool */int numeric); // as above, but append the final string char *to_engineering_string_unit(char *buf, ptrdiff_t buf_size, double value, unsigned int digits, /* bool */int numeric, const char *unit); // converts the output of to_engineering_string() into a double double from_engineering_string(const char *val); // step a value by the smallest possible increment char *step_engineering_string(char *buf, ptrdiff_t buf_size, const char *val, unsigned int digits, /* bool */ int numeric, /* bool */ int positive); #endif