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boostorg / format

Boost.org format module
http://boost.org/libs/format
Boost Software License 1.0
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ISO C99 Standards Support #27

Closed jeking3 closed 7 years ago

jeking3 commented 7 years ago

I am working on identifying where boost::format and sprintf differ in behavior. I wrote a matrix test comparing standard sprintf to boost::format for purposes of ensuring that boost::format handles all of the format strings that sprintf does, and we're currently at about 41% pass rate. This matrix doesn't test every possible combination of format modifiers yet - just one of each was enough. Results are very early, and I will be working on improving this.

Here's some sample output from the test:

       Format String | RSLT | "printf"                              | "boost::format"                       | error info
---------------------+------+---------------------------------------+---------------------------------------+--------------------------------------------------
              % 1.5c | FAIL | "X"                                   | " "                                   | mismatch
             % 1.20c | FAIL | "X"                                   | " "                                   | mismatch
                % 2c | FAIL | " X"                                  | "  "                                  | mismatch
               % 2.c | FAIL | " X"                                  | "  "                                  | mismatch
...
                 %5u |      | "4294954950"                          | "4294954950"                          |
                %5.u |      | "4294954950"                          | "4294954950"                          |
               %5.2u |      | "4294954950"                          | "4294954950"                          |
               %5.5u |      | "4294954950"                          | "4294954950"                          |
              %5.20u | FAIL | "00000000004294954950"                | "4294954950"                          | mismatch
...
              %020Lf |      | "6543211234567.891602"                | "6543211234567.891602"                |
             %020.Lf |      | "00000006543211234568"                | "00000006543211234568"                |
            %020.2Lf |      | "00006543211234567.89"                | "00006543211234567.89"                |
            %020.5Lf |      | "06543211234567.89160"                | "06543211234567.89160"                |
           %020.20Lf |      | "6543211234567.89160156250000000000"  | "6543211234567.89160156250000000000"  |
                  %F | EXCP | "1234567.875000"                      | ""                                    | boost::bad_format_string: format-string is ill-formed
...
              %020LG |      | "0000000006.54321E+12"                | "0000000006.54321E+12"                |
             %020.LG | FAIL | "0000000000000007E+12"                | "0000000006.54321E+12"                | mismatch
            %020.2LG |      | "00000000000006.5E+12"                | "00000000000006.5E+12"                |
            %020.5LG |      | "00000000006.5432E+12"                | "00000000006.5432E+12"                |
           %020.20LG |      | "6543211234567.8916016"               | "6543211234567.8916016"               |

Failed Tests: 6707 Total Tests: 11401 Pass Rate: 41.2%

jeking3 commented 7 years ago

Read through the docs; sounds like the intention of the library is not to be a sprintf replacement (sad). Closing this out.