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GETLOPT.H
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C/C++ Source or Header
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1997-04-08
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2KB
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66 lines
/*
* getlopt.h
*
* Oliver Fromme <oliver.fromme@heim3.tu-clausthal.de>
* Tue Apr 8 07:13:39 MET DST 1997
*/
#include <stdlib.h>
#include <string.h>
extern int loptind; /* index in argv[] */
extern int loptchr; /* index in argv[loptind] */
extern char *loptarg; /* points to argument if present, else to option */
typedef struct {
char sname; /* short option name, can be 0 */
char *lname; /* long option name, can be 0 */
int flags; /* see below */
void (*func)(char *); /* called if != 0 (after setting of var) */
void *var; /* type is *int, *char or **char, see below */
int value;
} topt;
#define GLO_ARG 1
#define GLO_CHAR 2
#define GLO_NUM 0
/* flags:
* bit 0 = 0 - no argument
* if var != NULL
* *var := value or (char)value [see bit 1]
* else
* loptarg = &option
* return ((value != 0) ? value : sname)
* bit 0 = 1 - argument required
* if var != NULL
* *var := atoi(arg) or strdup(arg) [see bit 1]
* else
* loptarg = &arg
* return ((value != 0) ? value : sname)
*
* bit 1 = 0 - var is a pointer to an int
* bit 1 = 1 - var is a pointer to a char (or string),
* and value is interpreted as char
*
* Note: The options definition isterminated by a topt
* containing only zeroes.
*/
#define GLO_END 0
#define GLO_UNKNOWN -1
#define GLO_NOARG -2
#define GLO_CONTINUE -3
int getlopt (int argc, char *argv[], topt *opts);
/* return values:
* GLO_END (0) end of options
* GLO_UNKNOWN (-1) unknown option *loptarg
* GLO_NOARG (-2) missing argument
* GLO_CONTINUE (-3) (reserved for internal use)
* else - return value according to flags (see above)
*/
/* EOF */