130 lines
2.7 KiB
C++
130 lines
2.7 KiB
C++
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// Regression test for STL seekg
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#include <cstdio> // I really like formatted output.
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#include <cstdarg>
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#include <fstream>
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#include <vector>
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#include <iostream>
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#ifndef cstd
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#ifdef _MSC_VER
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#define cstd
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#else
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#define cstd std
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#endif
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#endif
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class Error : public std::exception
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{
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public:
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Error(const char *pszfmt, ...);
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const char *what() const;
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private:
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char mMessage[256];
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};
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#define countof(x) (sizeof(x)/sizeof((x)[0]))
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Error::Error(const char *pszfmt, ...)
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{
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using cstd::va_list;
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cstd::va_list ap;
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va_start(ap, pszfmt);
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cstd::vsnprintf(mMessage, countof(mMessage), pszfmt, ap);
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va_end(ap);
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}
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const char *Error::what() const
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{
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return mMessage;
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}
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// usage: testseek filename
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int main(int argc, char **argv)
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{
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try
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{
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if (argc != 2) {
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throw Error("Wrong number of arguments (Usage: testseek filename)");
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}
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std::ifstream ifs;
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ifs.exceptions(std::ios::badbit);
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ifs.open(argv[1]);
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// First pass: read contents of file into character vector
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std::vector<char> charvec;
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cstd::printf("First pass:\n");
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for(;;)
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{
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char ch;
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if (!ifs.get(ch)) {
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break;
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}
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cstd::printf("%c", ch);
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charvec.push_back(ch);
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}
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cstd::printf("First pass done\n");
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// Second pass: get positions into pos vector, checking chars
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std::vector<std::ios::pos_type> posvec;
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ifs.clear(); // necessary?
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ifs.seekg(0);
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std::vector<char>::const_iterator char_it;
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cstd::printf("Second pass:\n");
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for(char_it = charvec.begin(); char_it != charvec.end(); ++char_it)
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{
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std::ios::pos_type pos = ifs.tellg();
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posvec.push_back(pos);
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char ch;
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if (!ifs.get(ch)) {
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break;
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}
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cstd::printf("%c", ch);
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if (ch != *char_it) {
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throw Error("Character mismatch: got '%c', expected '%c'",
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ch, *char_it);
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}
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}
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if (char_it != charvec.end()) {
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throw Error("Unexpected end of file");
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}
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cstd::printf("Second pass done\n");
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// Third pass: seek to each saved position and read next char
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ifs.clear(); // necessary, but I don't like it
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std::vector<std::ios::pos_type>::const_iterator pos_it;
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cstd::printf("Third pass:\n");
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for(char_it = charvec.begin(), pos_it = posvec.begin();
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char_it != charvec.end(); ++char_it, ++pos_it)
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{
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ifs.seekg(*pos_it);
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char ch;
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if (!ifs.get(ch)) {
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throw Error("End of file when expecting '%c'", *char_it);
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}
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cstd::printf("%c", ch);
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if (ch != *char_it) {
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throw Error("Character mismatch: got '%c', expected '%c'",
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ch, *char_it);
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}
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}
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cstd::printf("Third pass done\n");
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cstd::printf("Test passed\n");
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std::cerr<<"Testing cerr...\n";
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std::cerr<<"Testing cerr"<<std::endl;
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std::cerr<<"Testing cerr with char "<<(char)'5'<<std::endl;
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std::cerr<<"Testing cerr with float "<<(float)5.555<<std::endl;
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std::cerr<<"Testing cerr with int "<<(int)5<<std::endl;
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}
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catch (std::exception &e)
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{
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cstd::printf("\nCaught exception: %s\n", e.what());
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cstd::printf("Test failed!\n");
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return 1;
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}
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return 0;
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}
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// end of program
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