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dedicated function for checking if two files are the same

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Frédéric Mangano-Tarumi 2018-11-11 11:57:25 -05:00
parent b9dbaf1049
commit 632caae915
1 changed files with 18 additions and 8 deletions
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26
src/opustags.cc
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@ -27,16 +27,26 @@ static void print_tags(ot::opus_tags &tags)
}
}
/**
* Check if two filepaths point to the same file, after path canonicalization.
* The path "-" is treated specially, meaning stdin for path_in and stdout for path_out.
*/
static bool same_file(const std::string& path_in, const std::string& path_out)
{
if (path_in == "-" || path_out == "-")
return false;
char canon_in[PATH_MAX+1], canon_out[PATH_MAX+1];
if (realpath(path_in.c_str(), canon_in) && realpath(path_out.c_str(), canon_out)) {
return (strcmp(canon_in, canon_out) == 0);
}
return false;
}
static int run(ot::options& opt)
{
if (!opt.path_out.empty() && opt.path_in != "-" && opt.path_out != "-") {
char canon_in[PATH_MAX+1], canon_out[PATH_MAX+1];
if (realpath(opt.path_in.c_str(), canon_in) && realpath(opt.path_out.c_str(), canon_out)) {
if (strcmp(canon_in, canon_out) == 0) {
fputs("error: the input and output files are the same\n", stderr);
return EXIT_FAILURE;
}
}
if (!opt.path_out.empty() && same_file(opt.path_in, opt.path_out)) {
fputs("error: the input and output files are the same\n", stderr);
return EXIT_FAILURE;
}
ot::ogg_reader reader;
ot::ogg_writer writer;