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json::string currently handles null-terminated data and so can't work with data that may contain embedded null bytes or that is not null-terminated. Supporting such data will make json::string more robust in some contexts, such as SARIF output, which uses it to output user source code that may contain embedded null bytes. gcc/ChangeLog: * json.h (class string): Add M_LEN member to store the length of the data. Add constructor taking an explicit length. * json.cc (string::string): Implement the new constructor. (string::print): Support printing strings that are not null-terminated. Escape embdedded null bytes on output. (test_writing_strings): Test the new null-byte-related features of json::string.
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