84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
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/*
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getlopt: command line option/parameter parsing
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copyright ?-2006 by the mpg123 project - free software under the terms of the LGPL 2.1
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see COPYING and AUTHORS files in distribution or http://mpg123.org
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initially written Oliver Fromme
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old timestamp: Tue Apr 8 07:13:39 MET DST 1997
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*/
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#include <stdlib.h>
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#include <string.h>
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#ifndef _MPG123_GETLOPT_H_
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#define _MPG123_GETLOPT_H_
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extern int loptind; /* index in argv[] */
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extern int loptchr; /* index in argv[loptind] */
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extern char *loptarg; /* points to argument if present, else to option */
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struct topt;
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typedef struct topt topt;
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struct topt {
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char sname; /* short option name, can be 0 */
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char *lname; /* long option name, can be 0 */
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int flags; /* see below */
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void (*func)(char *, topt *); /* called if != 0 (after setting of var) */
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void *var; /* type is *long, *char or **char, see below */
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long value;
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};
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/* ThOr: make this clear; distict long from int (since this is != on my Alpha) and really use a flag for every case (spare the 0 case
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for .... no flag) */
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#define GLO_ARG 1
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#define GLO_CHAR 2
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#define GLO_INT 4
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#define GLO_LONG 8
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#define GLO_DOUBLE 16
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/* This is set if getlopt allocates memory for var. */
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#define GLO_VAR_MEM 32
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/* flags:
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* bit 0 = 0 - no argument
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* if var != NULL
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* *var := value or (char)value [see bit 1]
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* else
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* loptarg = &option
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* return ((value != 0) ? value : sname)
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* bit 0 = 1 - argument required
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* if var != NULL
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* *var := atoi(arg) or strdup(arg) [see bit 1]
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* else
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* loptarg = &arg
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* return ((value != 0) ? value : sname)
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*
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* bit 1 = 1 - var is a pointer to a char (or string),
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* and value is interpreted as char
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* bit 2 = 1 - var is a pointer to int
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* bit 3 = 1 - var is a pointer to long
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*
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* Note: The options definition is terminated by a topt
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* containing only zeroes.
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*/
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#define GLO_END 0
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#define GLO_UNKNOWN -1
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#define GLO_NOARG -2
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#define GLO_CONTINUE -3
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#define GLO_BADARG -4
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int getlopt (int argc, char *argv[], topt *opts);
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// Helper to set a char parameter, avoiding memory leaks.
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void getlopt_set_char(topt *opts, char *name, char *value);
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/* return values:
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* GLO_END (0) end of options
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* GLO_UNKNOWN (-1) unknown option *loptarg
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* GLO_NOARG (-2) missing argument
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* GLO_CONTINUE (-3) (reserved for internal use)
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* else - return value according to flags (see above)
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*/
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#endif
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