getopt.h

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#ifndef GETOPT_H
#define GETOPT_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
extern int opterr;      /* useless, never set or used */
extern int optind;      /* index into parent argv vector */
extern int optopt;          /* character checked for validity */
extern char* optarg;        /* argument associated with option */
 
int getopt(int argc, char * const *argv, const char *optstring);
 
#ifdef __cplusplus
} /* end of extern "C" */
#endif
 
#endif /* GETOPT_H */