getopt.h: Compiling Linux C-Code in Windows

Question

I am trying to get a set of nine *.c files (and nine related *.h files) to compile under Windows.

The code was originally designed in Linux to take command line argu

Answer 1

getopt() is actually a really simple function. I made a github gist for it, code from here is below too

#include <string.h>
#include <stdio.h>

int     opterr = 1,             /* if error message should be printed */
  optind = 1,             /* index into parent argv vector */
  optopt,                 /* character checked for validity */
  optreset;               /* reset getopt */
char    *optarg;                /* argument associated with option */

#define BADCH   (int)'?'
#define BADARG  (int)':'
#define EMSG    ""

/*
* getopt --
*      Parse argc/argv argument vector.
*/
int
  getopt(int nargc, char * const nargv[], const char *ostr)
{
  static char *place = EMSG;              /* option letter processing */
  const char *oli;                        /* option letter list index */

  if (optreset || !*place) {              /* update scanning pointer */
    optreset = 0;
    if (optind >= nargc || *(place = nargv[optind]) != '-') {
      place = EMSG;
      return (-1);
    }
    if (place[1] && *++place == '-') {      /* found "--" */
      ++optind;
      place = EMSG;
      return (-1);
    }
  }                                       /* option letter okay? */
  if ((optopt = (int)*place++) == (int)':' ||
    !(oli = strchr(ostr, optopt))) {
      /*
      * if the user didn't specify '-' as an option,
      * assume it means -1.
      */
      if (optopt == (int)'-')
        return (-1);
      if (!*place)
        ++optind;
      if (opterr && *ostr != ':')
        (void)printf("illegal option -- %c\n", optopt);
      return (BADCH);
  }
  if (*++oli != ':') {                    /* don't need argument */
    optarg = NULL;
    if (!*place)
      ++optind;
  }
  else {                                  /* need an argument */
    if (*place)                     /* no white space */
      optarg = place;
    else if (nargc <= ++optind) {   /* no arg */
      place = EMSG;
      if (*ostr == ':')
        return (BADARG);
      if (opterr)
        (void)printf("option requires an argument -- %c\n", optopt);
      return (BADCH);
    }
    else                            /* white space */
      optarg = nargv[optind];
    place = EMSG;
    ++optind;
  }
  return (optopt);                        /* dump back option letter */
}

Answer 2

The getopt.h exists in git, I have download it and it works for me:

https://gist.github.com/ashelly/7776712

Answer 3

From what I remember of getopt.h, all it does is provide a handy parser for processing argv from your main function:

int main(int argc, char * argv[])
{
}

Windows console programs still have a main method, so you can simply loop through your argv array and parse the parameters yourself. e.g.

for ( int i = 1; i < argc; i++ )
{
  if (!strcmp(argv[i], "-f"))
    filename = argv[++i];
}

Answer 4

I did compile the getopt code under windows.

I did this as I wanted to explicilty use its command line parsing functionality in a windows (command line) app.

I successfully did this using VC2010.

As far as I remember I ran into no significant issues doing so.

getopt.c getoptl.c

Answer 5

if you just want getopt to be used in visual c++ without other dependences, I have port the getopt.c from latest gnu libc 2.12, with all new features.The only difference is you have to use TCHAR instead of char,but This is very common in windows.

simply download the source, make, copy libgetopt.lib and getopt.h getopt_int.h to your project.

you can also make it using CMakeList.txt in the root dir.

download the source from github

Answer 6

From my reading of the documentation the header file getopt.h is specific to the GNU C library as used with Linux (and Hurd). The getopt function itself has been standardised by POSIX which says it should be declared, along with optind optarg etc. in unistd.h

I can't try this on Visual Studio myself but it would be worth checking if unistd.h exists and declares this function as Visual Studio does provides some other POSIX functions.

If not, then I'd definitely grab an implementation of getopt rather than re-write the argument parsing to work without it. Getopt was written to make things easier for the programmer and more consistent for user of programs with command line arguments. Do check the license, though.