getopt_long.h File Reference

#include "pg_getopt.h"

Include dependency graph for getopt_long.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures
struct	option

Macros
#define	no_argument   0
#define	required_argument   1
#define	optional_argument   2

Functions
int	getopt_long (int argc, char *const argv[], const char *optstring, const struct option *longopts, int *longindex)

Macro Definition Documentation

no_argument

#define no_argument   0

Definition at line 24 of file getopt_long.h.

optional_argument

#define optional_argument   2

Definition at line 26 of file getopt_long.h.

required_argument

#define required_argument   1

Definition at line 25 of file getopt_long.h.

Function Documentation

getopt_long()

int getopt_long	(	int	argc,
		char *const	argv[],
		const char *	optstring,
		const struct option *	longopts,
		int *	longindex
	)

Definition at line 57 of file getopt_long.c.

{
    static char *place = EMSG;  /* option letter processing */
    char       *oli;            /* option letter list index */
 
    if (!*place)
    {                           /* update scanning pointer */
        if (optind >= argc)
        {
            place = EMSG;
            return -1;
        }
 
        place = argv[optind];
 
        if (place[0] != '-')
        {
            place = EMSG;
            return -1;
        }
 
        place++;
 
        if (!*place)
        {
            /* treat "-" as not being an option */
            place = EMSG;
            return -1;
        }
 
        if (place[0] == '-' && place[1] == '\0')
        {
            /* found "--", treat it as end of options */
            ++optind;
            place = EMSG;
            return -1;
        }
 
        if (place[0] == '-' && place[1])
        {
            /* long option */
            size_t      namelen;
            int         i;
 
            place++;
 
            namelen = strcspn(place, "=");
            for (i = 0; longopts[i].name != NULL; i++)
            {
                if (strlen(longopts[i].name) == namelen
                    && strncmp(place, longopts[i].name, namelen) == 0)
                {
                    int         has_arg = longopts[i].has_arg;
 
                    if (has_arg != no_argument)
                    {
                        if (place[namelen] == '=')
                            optarg = place + namelen + 1;
                        else if (optind < argc - 1 &&
                                 has_arg == required_argument)
                        {
                            optind++;
                            optarg = argv[optind];
                        }
                        else
                        {
                            if (optstring[0] == ':')
                                return BADARG;
 
                            if (opterr && has_arg == required_argument)
                                fprintf(stderr,
                                        "%s: option requires an argument -- %s\n",
                                        argv[0], place);
 
                            place = EMSG;
                            optind++;
 
                            if (has_arg == required_argument)
                                return BADCH;
                            optarg = NULL;
                        }
                    }
                    else
                    {
                        optarg = NULL;
                        if (place[namelen] != 0)
                        {
                            /* XXX error? */
                        }
                    }
 
                    optind++;
 
                    if (longindex)
                        *longindex = i;
 
                    place = EMSG;
 
                    if (longopts[i].flag == NULL)
                        return longopts[i].val;
                    else
                    {
                        *longopts[i].flag = longopts[i].val;
                        return 0;
                    }
                }
            }
 
            if (opterr && optstring[0] != ':')
                fprintf(stderr,
                        "%s: illegal option -- %s\n", argv[0], place);
            place = EMSG;
            optind++;
            return BADCH;
        }
    }
 
    /* short option */
    optopt = (int) *place++;
 
    oli = strchr(optstring, optopt);
    if (!oli)
    {
        if (!*place)
            ++optind;
        if (opterr && *optstring != ':')
            fprintf(stderr,
                    "%s: illegal option -- %c\n", argv[0], optopt);
        return BADCH;
    }
 
    if (oli[1] != ':')
    {                           /* don't need argument */
        optarg = NULL;
        if (!*place)
            ++optind;
    }
    else
    {                           /* need an argument */
        if (*place)             /* no white space */
            optarg = place;
        else if (argc <= ++optind)
        {                       /* no arg */
            place = EMSG;
            if (*optstring == ':')
                return BADARG;
            if (opterr)
                fprintf(stderr,
                        "%s: option requires an argument -- %c\n",
                        argv[0], optopt);
            return BADCH;
        }
        else
            /* white space */
            optarg = argv[optind];
        place = EMSG;
        ++optind;
    }
    return optopt;
}

References BADARG, BADCH, EMSG, option::flag, flag(), fprintf, option::has_arg, i, name, option::name, no_argument, optarg, opterr, optind, optopt, required_argument, and option::val.

Referenced by get_opts(), handle_args(), main(), parse_psql_options(), parseCommandLine(), and regression_main().