1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278
|
/*
********************************************************************************
File: mygetopt.c
Tab size: 4
Max line length: 80
Programmer: Volker Kuhlmann
mygetopt 1.1 Copyright (C) 1997 Volker Kuhlmann
This program is free software under the terms of the GNU General Public License
version 2 (or later, at your option).
See the file COPYING for details about license terms and warranty.
<v.kuhlmann@elec.canterbury.ac.nz>
DESCRIPTION:
Function for command line argument scanning.
The function arguments are the same as for GNU getopt_long() and
getopt_long_only(), this is meant to be a (less functional!) replacement for
when the GNU functions are not available.
This module and its header work stand-alone and can be linked with any other
program.
Written with strict ANSI conformance.
CONDITIONALS:
DEBUG Generates some debugging output on stderr.
HISTORY:
1.1 08Dec97 Commented. Example.
1.1 07Dec97 Added scanning of short options, made more GNU compliant.
1.0 04Dec97 Created
********************************************************************************
*/
#include <string.h>
#ifdef DEBUG
#include <stdio.h>
#define STRNULL(charptr) ((charptr) == NULL ? "(NULL)" : (charptr))
#endif
#include "mygetopt.h"
#ifndef AND
#define AND &&
#endif
/* global variables (exported) */
int optind = 1;
char *optarg = NULL;
int optopt = '?';
int opterr = 1;
/*
My (quick) version of the GNU C library getopt_long() function.
Arguments are the same, though functionality is far less extensive.
No sorting of argv[] is done, scanning is terminated with the first
unrecognised option.
Short options can not be grouped together in a single word.
Options to both short and long options must be separated by a space (i.e.
be the next word on the command line). Options with optional options are
treated as if they required an option.
No abbreviations are recognised.
When returning -1, option scanning is finished and optind points to the
first command line word following the last option.
Between calls, optind shows whatever (the GNU version jumps all over the
place).
If options->flag is != NULL, it gets the value of options->val and 0 is
returned, otherwise options->val is returned.
Returns '?' when a short option is not recognised (optopt contains short
option), or when a long option is not recognised (optopt contains 0 and
optind points to the option + 1), or when a required argument is missing
(optopt contains the short option resp. options->val and optind points to
option + 1 i.e. NULL for long options).
Side: if the last recognised option requires an argument, it is returned in
optarg; updates optind, and optopt when returning '?'
In: see function arg list
Out: index into options array if option was recognised
Return: -1, 0, '?', or value
*/
int getopt_long (
int argc,
char *const argv[],
const char *shortoptions,
const struct option *options,
int *lidx)
{
int opt = 0; /* counter for option array */
char *thisarg;
#ifdef DEBUG
fprintf (stderr, "my getopt_long(), optind: %i\n", optind);
#endif
if (optind == 0) /* init */
optind = 1;
else
optind++; /* advance to index the currently analysed arg */
if (optind >= argc) /* finish if we run out of arguments */
return -1;
/* finish if this argument does not start with '-' and therefore can be no
option */
if ((thisarg = argv[optind])[0] != '-')
return -1;
thisarg++; /* advance thisarg till after '-' */
#ifdef DEBUG
fprintf (stderr, " thisarg: %s\n", thisarg);
#endif
if (thisarg[0] == '\0')
return -1; /* current arg is exactly "-", can't sort -> finished */
/* deal with short options */
if (thisarg[0] != '-') {
char *pc;
pc = strchr (shortoptions, thisarg[0]);
#ifdef DEBUG
fprintf (stderr, " thisarg: <%s>, strchr: <%s>\n",
thisarg, STRNULL(pc));
#endif
if (pc == NULL) {
optopt = thisarg[0]; /* illegal short option */
return '?';
}
if (pc[1] == ':') {
optind++;
optarg = argv[optind];
if (optind >= argc)
return optopt = pc[0], '?'; /* requires arg and none left */
}
return *pc;
} /* end scan short option */
if (*++thisarg == '\0') { /* if arg was -- stop opt processing */
optind++;
return -1;
}
/* scan long option */
#ifdef DEBUG
fprintf (stderr, " optind: %i, thisarg: %s\n", optind, thisarg);
#endif
while (options[opt].name != NULL) {
if (strcmp (thisarg, options[opt].name) == 0) {
/* have recognised option */
*lidx = opt;
if (options[opt].has_arg != no_argument) {
/* update *lidx, optind, optarg */
optind++;
optarg = argv[optind];
if ((options[opt].has_arg == required_argument)
&& (optind >= argc))
/* requires arg and there is none left */
return optopt = options[opt].val, '?';
}
/* update flag or return val */
if (options[opt].flag == NULL)
return options[opt].val;
else {
*options[opt].flag = options[opt].val;
return 0;
}
}
opt++;
}
optopt = 0x00;
return -1; /* unrecognised option, can't sort therefore must finish */
} /* getopt_long() */
#if 0
This is an example showing how to use it.
/*
Parse command line and do some checks for consistency.
In: argc, argv
Out: ---
Return: ---
*/
void scan_cmd_args (int argc, char **argv)
{
int lidx;
int r = 1;
enum {
o_whatever = 1,
o_swapwords0, o_swapwords1
};
const string shortoptions[] = "hi:o:";
const struct option longoptions[] = {
{"help", no_argument, NULL, 'h'},
{"usage", no_argument, cmdarg.usage, TRUE},
{"whatever", no_argument, NULL, o_whatever},
{"swapwords", no_argument, NULL, o_swapwords1},
{"noswapwords", no_argument, NULL, o_swapwords0},
{"in", required_argument, NULL, 'i'},
{"out", required_argument, NULL, 'o'},
{NULL, no_argument, NULL, 0}
};
optind = 0; /* tell getopt to init */
while (r != -1) {
r = getopt_long (argc, argv, shortoptions, longoptions, &lidx);
switch (r) {
case 'h':
cmdarg.help = TRUE;
break;
case o_swapwords1:
cmdarg.swapwords = TRUE;
break;
case o_swapwords0:
cmdarg.swapwords = FALSE;
break;
case o_whatever:
cmdarg.whatever = whatever;
break;
case 'i':
cmdarg.infilename = optarg;
break;
case 'o':
cmdarg.outfilename = optarg;
break;
case 0:
case -1:
break;
case '?':
/* some error, optopt knows more */
/* this test falls over for long options with option->val == 0 */
if (optopt == 0x00)
exit_error (ERR_CMDARG, "unknown option: ", argv[optind - 1]);
if ((strchr (shortoptions, optopt) != NULL)
OR NOT isprint (optopt))
exit_error (ERR_CMDARG,
argv[optind - 1], " requires an argument");
else {
string s[2];
s[0] = isprint (optopt) ? optopt : ' '; s[1] = '\0';
exit_error (ERR_CMDARG, "unknown short option: ", s);
}
default:
/* internal error */
}
}
/* remaining arguments (if any) parameters to be scanned by the user */
remaining = argc - optind;
} /* scan_cmd_args() */
#endif /* example */
/* EOF mygetopt.c */
/******************************************************************************/
|