cpptools-wordexp.cpp

#include <iostream>
#include <wordexp.h>

using namespace std;

char hexDigit(int digit) {
  if (digit >= 0 && digit <= 9) {
    return '0' + digit;
  } else if (digit >= 10 && digit <= 15) {
    return 'A' + digit - 10;
  } else {
    return '?';
  }
}

void printString(char *str) {
  std::cout << "\"";
  for (;; str++) {
    char c = *str;
    if (c == '\0') {
      break;
    } else if (c == '"') {
      std::cout << "\\\"";
    } else if (c == '\n') {
      std::cout << "\\n";
    } else if (c == '\r') {
      std::cout << "\\r";
    } else if (c == '\\') {
      std::cout << "\\\\";
    } else if (c < 0x20) {
      char hex[3] = {hexDigit(c / 16), hexDigit(c % 16), '\0'};
      std::cout << "\\x" << hex;
    } else {
      char cstr[2] = {c, '\0'};
      std::cout << cstr;
    }
  }
  std::cout << "\"";
}

int main(int argc, char **argv) {
  if (argc != 2) {
    std::cerr << "Argc (" << argc << ") != 2" << std::endl;
    return -1;
  }

  wordexp_t exp;
  int error = wordexp(argv[1], &exp, 0);
  if (error != 0) {
    const char *error_name;
    if (error == WRDE_BADCHAR) {
      error_name = "WRDE_BADCHAR";
    } else if (error == WRDE_BADVAL) {
      error_name = "WRDE_BADVAL";
    } else if (error == WRDE_CMDSUB) {
      error_name = "WRDE_CMDSUB";
    } else if (error == WRDE_NOSPACE) {
      error_name = "WRDE_NOSPACE";
    } else if (error == WRDE_SYNTAX) {
      error_name = "WRDE_SYNTAX";
    } else {
      error_name = "?????";
    }
    std::cerr << "wordexp error code " << error << " (" << error_name << ")"
              << std::endl;
    return error;
  }

  if (exp.we_offs != 0) {
    std::cerr << "Unexpected initial offsets." << std::endl;
    return -1;
  }

  std::cout << "[";
  for (size_t i = 0; i < exp.we_wordc; i++) {
    if (i != 0) {
      std::cout << ", ";
    }
    printString(exp.we_wordv[i]);
  }
  std::cout << "]" << std::endl;

  wordfree(&exp);
  return 0;
}