\uc774\ubc88\uc5d0\ub294 getopt \ud568\uc218\ub97c \uc5b4\ub5bb\uac8c \ud638\ucd9c\ud558\ub294\uc9c0\uc5d0 \ub300\ud574\uc11c \uc790\uc138\ud788 \uc124\uba85\ud55c\ub2e4. \uc774 \uae30\ub2a5\uc744 \uc0ac\uc6a9\ud558\uae30 \uc704\ud574\uc11c,
\ub2f9\uc2e0\uc758 \ud504\ub85c\uadf8\ub7a8\uc5d0 \ud5e4\ub354\ud30c\uc77c `unistd.h'\uc744 \ud3ec\ud568\uc2dc\ucf1c\uc57c\ub9cc \ud55c\ub2e4.
\ubcc0\uc218 : int opterr
\ub9cc\uc77c \uc774 \ubcc0\uc218\uc758 \uac12\uc774 0\uc774 \uc544\ub2c8\uba74, getopt\ub294 \ub9cc\uc77c \uc54c\uc9c0\ubabb\ud558\ub294 \uc635\uc158 \ubb38\uc790\uac00 \ub4e4\uc5b4\uc624\uac70\ub098 \uc778\uc218\ub97c \ud544\uc694\ub85c
\ud558\ub294 \uc635\uc158\uc774 \uc635\uc158\uc744 \uac16\uace0\uc788\uc9c0 \uc54a\ub2e4\uba74 \ud45c\uc900 \uc5d0\ub7ec \uc2a4\ud2b8\ub9bc\uc5d0 \uc5d0\ub7ec\uba54\uc138\uc9c0\ub97c \ud504\ub9b0\ud2b8\ud55c\ub2e4. \uc774\uac83\uc740 \ub514\ud3f4\ud2b8
\ub3d9\uc791\uc774\ub2e4. \ub9cc\uc77c \ub2f9\uc2e0\uc774 \uc774 \ubcc0\uc218\ub97c 0\uc73c\ub85c \uc124\uc815\ud558\uba74, getopt\ub294 \uc544\ubb34\ub7f0 \uba54\uc2dc\uc9c0\ub3c4 \ud504\ub9b0\ud2b8\ud558\uc9c0\ub294 \uc54a\uc9c0\ub9cc,
\uc5d0\ub7ec\ub97c \uc9c0\uc801\ud558\uae30 \uc704\ud574\uc11c \uc5ec\uc804\ud788 ? \ubb38\uc790\ub97c \uc5ec\uc804\ud788 \ub9ac\ud134\ud55c\ub2e4.
\ubcc0\uc218 : int optopt
getopt\uac00 \uc54c\ub824\uc9c0\uc9c0 \uc54a\uc740 \uc635\uc158 \ubb38\uc790\uc640 \ub9cc\ub098\uac70\ub098 \ud544\uc694\ud55c \uc778\uc218\uac00 \ube60\uc838\uc788\ub294 \uc635\uc158\uc77c \ub54c, getopt\ub294 \uadf8 \uc635\uc158
\ubb38\uc790\ub97c \uc774 \ubcc0\uc218\uc5d0 \uc800\uc7a5\ud55c\ub2e4. \ub2f9\uc2e0\uc740 \uc790\uc2e0\ub9cc\uc758 \uc9c4\ub2e8 \uba54\uc2dc\uc9c0\ub97c \uc81c\uacf5\ud558\uae30 \uc774\ud574\uc11c \uc774 \ubcc0\uc218\ub97c \uc0ac\uc6a9\ud560 \uc218
\uc788\ub2e4.
\ubcc0\uc218 : int optind
\uc774 \ubcc0\uc218\ub294 \uc55e\uc73c\ub85c \ubd84\uc11d\ud560 \ubc30\uc5f4 argv\uc758 \ub2e4\uc74c \uc694\uc18c\uc5d0 \ub300\ud55c \uc778\ub371\uc2a4\ub85c getopt\uc5d0 \uc758\ud574 \uc124\uc815\ub41c\ub2e4. \uc77c\ub2e8
getopt\uac00 \uc635\uc158 \uc778\uc218\ub4e4 \ubaa8\ub450\ub97c \ubc1c\uacac\ud588\ub2e4\uba74, \ub2f9\uc2e0\uc740 \ub098\uba38\uc9c0 \ube44-\uc635\uc158 \uc778\uc218\ub4e4\uc774 \uc5b4\ub514\uc5d0\uc11c \uc2dc\uc791\ud558\ub294\uc9c0 \uacb0
\uc815\ud558\uae30 \uc704\ud574\uc11c \uc774 \ubcc0\uc218\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4. \uc774 \ubcc0\uc218\uc758 \ucd08\uae30\uac12\uc740 1\uc774\ub2e4.
\ubcc0\uc218 : chat *optarg
\uc774 \ubcc0\uc218\ub294 \uc778\uc218\ub4e4\uc744 \ubc1b\uc544\ub4e4\uc774\ub294 \uc635\uc158\ub4e4\uc744 \uc704\ud574\uc11c, \uc635\uc158 \uc778\uc218\ub4e4\uc758 \uac12\uc744 \uac00\ub9ac\ud0a4\ub294 \ud3ec\uc778\ud130\ub85c\uc368 getopt
\uc5d0 \uc758\ud574 \uc124\uc815\ub41c\ub2e4.<\/P>\n
\ud568\uc218 : int getopt(int argc, char **argv, const char *options)
getopt \ud568\uc218\ub294 argv\uc640 argc \uc778\uc218\ub4e4\uc5d0\uc758\ud574 \uc9c0\uc815\ub41c \uc778\uc218 \ubaa9\ub85d\uc73c\ub85c\ubd80\ud130 \ub2e4\uc74c \uc635\uc158 \uc778\uc218\ub97c \uc5bb\ub294\ub2e4. \ubcf4
\ud1b5, \uadf8\ub4e4 \uac12\ub4e4\uc740 main\uc5d0 \uc758\ud574 \ubc1b\uc544 \ub4e4\uc5ec\uc9c4 \uc778\uc218\ub4e4\ub85c\ubd80\ud130 \uc9c1\uc811\uc801\uc73c\ub85c \uc628\ub2e4. \uc635\uc158 \uc778\uc218\ub294 \uc774 \ud504\ub85c\uadf8
\ub7a8\uc5d0\uc11c \uc720\uc6a9\ud558\uac8c \uc4f0\uc77c \uc635\uc158 \ubb38\uc790\ub4e4\uc744 \uc9c0\uc815\ud55c \ubb38\uc790\uc5f4\uc774\ub2e4. \ubb38\uc790\uc5f4\uc548\uc5d0 \uc788\ub294 \uc635\uc158 \ubb38\uc790\ub294 \uc778\uc218\uac00 \ud544
\uc694\ud568\uc744 \uc54c\ub9ac\uae30 \uc704\ud574\uc11c \ucf5c\ub860(`:')\uc758 \ub2e4\uc74c\uc5d0 \ub098\ud0c0\ub09c\ub2e4.
\ub9cc\uc77c \uc635\uc158 \uc778\uc218 \ubb38\uc790\uc5f4\uc774 \ud558\uc774\ud508(`-')\uc73c\ub85c \uc2dc\uc791\ud55c\ub2e4\uba74, \uc774\uac83\uc740 \ud2b9\ubcc4\ud558\uac8c \ucde8\uae09\ub41c\ub2e4. \uadf8\ub4e4\uc740 \uc635\uc158 \ubb38
\uc790\uac00 `\\0'\uc778\uac83\ucc98\ub7fc \ub9ac\ud134\ub418\uc5b4, \uc635\uc158\uc774 \uc5c6\ub294 \uc778\uc218\ub4e4\uc744 \ud5c8\uc6a9\ud55c\ub2e4. getopt \ud568\uc218\ub294 \ub2e4\uc74c \ucee4\ub9e8\ub4dc \ub77c\uc778\uc635\uc158
\uc758 \uc635\uc158 \ubb38\uc790\ub97c \ub9ac\ud134\ud55c\ub2e4. \ub354 \uc774\uc0c1 \uc720\uc6a9\ud55c \uc635\uc158 \uc778\uc218\ub4e4\uc774 \uc5c6\uc744 \ub54c, -1\uc744 \ub9ac\ud134\ud55c\ub2e4. \uadf8\uacf3\uc740 \uc774\uc81c \ube44
-\uc635\uc158 \uc778\uc218\ub4e4\uc774 \uc788\uc744 \uac83\uc774\ub2e4; \ub2f9\uc2e0\uc740 \uc774\uac83\uc744 \uccb4\ud06c\ud558\uae30 \uc704\ud574\uc11c argc \ud30c\ub77c\ubbf8\ud130\uc5d0 \ub300\uc751\ud558\ub294
\uc678\ubd80\ubcc0\uc218 optind\ub97c \ube44\uad50\ud574\uc57c\ub9cc \ud55c\ub2e4.
\ub9cc\uc77c \uc5b4\ub5a4 \uc635\uc158\uc774 \uc778\uc218\ub97c \uac00\uc9c4\ub2e4\uba74, getopt \ub294 \ubcc0\uc218\ub4e4 optarg\uc548\uc5d0 \uadf8\uac83\uc744 \uc800\uc7a5\ud568\uc73c\ub85c\uc368 \uc778\uc218\ub97c \ub9ac\ud134
\ud55c\ub2e4. \ub2f9\uc2e0\uc774 \ub367\uc50c\uc6cc\uc9c8\uc9c0\ub3c4 \ubaa8\ub974\ub294 \uc815\uc801 \ubcc0\uc218\uac00 \uc544\ub2cc, \ubcf4\ud1b5\uc758 argv \ubc30\uc5f4\uc744 \uac00\ub9ac\ud0a4\ub294 \ud3ec\uc778\ud130\ub97c \ub77c\uba74,
optarg \ubb38\uc790\uc5f4\uc744 \ubcf5\uc0ac\ud560 \ud544\uc694\uac00 \uc5c6\ub2e4.
\ub9cc\uc77c \uc54c\ub824\uc9c0\uc9c0 \uc54a\uc740 \uc635\uc158\ubb38\uc790\ub97c \uc0ac\uc6a9\ud558\uac70\ub098, \uc635\uc158 \uc778\uc218\uac00 \ube60\uc838\uc788\ub2e4\uba74 getopt\ub294 `?'\ub97c \ub9ac\ud134\ud558\uace0 \ud604\uc7ac
\uc635\uc158 \ubb38\uc790\ub85c \uc678\ubd80\ubcc0\uc218 optopt\ub97c \uc124\uc815\ud55c\ub2e4. \ub9cc\uc77c \uc635\uc158\uc758 \uccab \ubc88\uc9f8 \ubb38\uc790\uac00 \ucf5c\ub860(`:') \uc774\ub77c\uba74, getopt\ub294
\uc635\uc158 \uc778\uc218\uac00 \ube60\uc838\uc788\uc74c\uc744 \uc54c\ub9ac\uae30 \uc704\ud574\uc11c `?' \ub300\uc2e0\uc5d0 `:'\ub97c \ub9ac\ud134\ud55c\ub2e4. \ub610\ud55c, \ub9cc\uc77c \uc678\ubd80\ubcc0\uc218 opterr\uc774 0
\uc774 \uc544\ub2c8\uba74(\ub514\ud3f4\ud2b8\uc774\ub2e4.), getopt\ub294 \uc5d0\ub7ec \uba54\uc2dc\uc9c0\ub97c \ucd9c\ub825\ud55c\ub2e4.
22.1.3 getopt\ub97c \uc0ac\uc6a9\ud574\uc11c \uc778\uc218\ub97c \uad6c\ubb38\ubd84\uc11d\ud558\ub294 \uc608\uc81c.
\ub2e4\uc74c\uc740 getopt\uac00 \uc804\ud615\uc801\uc73c\ub85c \uc5b4\ub5bb\uac8c \uc0ac\uc6a9\ub418\ub294\uc9c0\ub97c \ubcf4\uc5ec\uc8fc\ub294 \uc608\uc81c\uc774\ub2e4. \ud575\uc2ec\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4:
\ub441 \ubcf4\ud1b5, getopt\ub294 \ub8e8\ud504\uc548\uc5d0\uc11c \ud638\ucd9c\ub41c\ub2e4. getopt\uac00 \ub354 \uc774\uc0c1 \ub098\ud0c0\ub09c \uc635\uc158\uc774 \uc5c6\uc74c\uc744 \uc54c\ub9ac\uae30 \uc704\ud574\uc11c -1
\uc744 \ub9ac\ud134\ud558\uba74, \ub8e8\ud504\ub294 \uc885\ub8cc\ud55c\ub2e4.
\ub441 switch \uad6c\ubb38\uc740 getopt\ub85c\ubd80\ud130\uc758 \ub9ac\ud134\uac12\uc5d0 \ub530\ub978 \uac01\uac01\uc758 \ucc98\ub9ac\uc5d0 \uc0ac\uc6a9\ub41c\ub2e4. \uac01\uac01\uc758 \uacbd\uc6b0\ub294 \ud504\ub85c\uadf8\ub7a8\uc5d0
\uc11c \ub098\uc911\uc5d0 \uc0ac\uc6a9\ub420 \ubcc0\uc218\ub97c \uc124\uc815\ud558\uac8c \ub41c\ub2e4.
\ub441 \ub450 \ubc88\uc9f8 \ub8e8\ud504\ub294 \ub0a8\uc544\uc788\ub294 \ube44-\uc635\uc158 \uc778\uc218\ub4e4\uc744 \ucc98\ub9ac\ud558\ub294\ub370 \uc0ac\uc6a9\ub41c\ub2e4.
#include <unistd.h>
#include <stdio.h>
int
main (int argc, char **argv)
{
int aflag = 0;
int bflag = 0;
char *cvalue = NULL;
int index;
int c;
opterr = 0;
while ((c = getopt (argc, argv, \"abc:\")) != -1)
switch (c)
{
case 'a':
aflag = 1;
break;
case 'b':
bflag = 1;
break;
case 'c':
cvalue = optarg;
break;
case '?':
if (isprint (optopt))
fprintf(stderr, \"Unknown option `-%c'.\\n\", optopt);
else
fprintf (stderr,
\"Unknown option character `\\\\x%x'.\\n\", optopt);
return 1;
default:
abort ();
}
printf(\"aflag = %d, bflag = %d, cvalue = %s\\n\", aflag, bflag, cvalue);
for (index = optind; index < argc; index++)
printf (\"Non-option argument %s\\n\", argv[index]);
return 0;
}
\ub2e4\uc74c\uc740 \uc704\uc758 \ud504\ub85c\uadf8\ub7a8\uc744 \uc5ec\ub7ec \uac00\uc9c0 \uc778\uc218\ub4e4\uc758 \uc870\ud569\uc744 \uc0ac\uc6a9\ud588\uc744 \ub54c \uc5b4\ub5a4 \uacb0\uacfc\ub97c \ub098\ud0c0\ub0b4\ub294\uc9c0\uc5d0 \ub300\ud55c
\uc608\uc774\ub2e4.
% testopt
aflag = 0, bflag = 0, cvalue = (null)
% testopt -a -b
aflag = 1, bflag = 1, cvalue = (null)
% testopt -ab
aflag = 1, bflag = 1, cvalue = (null)
% testopt -c foo
aflag = 0, bflag = 0, cvalue = foo
% testopt -cfoo
aflag = 0, bflag = 0, cvalue = foo
% testopt arg1
aflag = 0, bflag = 0, cvalue = (null)
Non-option argument arg1
% testopt -a arg1
aflag = 1, bflag = 0, cvalue = (null)
Non-option argument arg1
% testopt -c foo arg1
aflag = 0, bflag = 0, cvalue = foo
Non-option argument arg1
% testopt -a -- -b
aflag = 1, bflag = 0, cvalue = (null)
Non-option argument -b
% testopt -a -
aflag = 1, bflag = 0, cvalue = (null)
Non-option argument -<\/P>\n
<\/P>\n
<\/P>\n
22.1.4 \uae34 \uc635\uc158\ub4e4\uc744 \uad6c\ubb38\ubd84\uc11d\ud558\uae30.<\/P>\n
\ub2e8\uc77c\ud55c-\ubb38\uc790 \uc635\uc158\ub4e4\ub85c\ub9cc \ub418\uc5b4\uc788\ub294 GNU-\uc2a4\ud0c0\uc77c\uc758 \uae34 \uc635\uc158\ub4e4\uc744 \ubc1b\uc544\ub4e4\uc774\uae30 \uc704\ud574\uc11c\ub294 getopt \ub300\uc2e0\uc5d0
getopt_long\ub97c \uc0ac\uc6a9\ud55c\ub2e4. \ub2f9\uc2e0\uc740 \uc774\ub7f0 \uac00\uc678\uc758 \uc791\uc740 \uc791\uc5c5\uc744 \ud1b5\ud574\uc11c \ubaa8\ub4e0 \ud504\ub85c\uadf8\ub7a8\uc774 \uae34 \uc635\uc158\ub4e4\uc744 \ubc1b
\uc544\ub4e4\uc774\uac8c \ub9cc\ub4e4 \uc218 \uc788\uace0, \ucd08\ubcf4\uc790\ub4e4\uc5d0\uac8c \uc5b4\ub5bb\uac8c \uadf8 \ud504\ub85c\uadf8\ub7a8\uc744 \uc0ac\uc6a9\ud558\ub294\uc9c0 \ub3c4\uc6b8 \uc218\uc788\ub2e4.
\ub370\uc774\ud130 \ud0c0\uc785 : struct option
\uc774 \uad6c\uc870\uccb4\ub294 getopt_long\uc744 \uc704\ud55c \ub2e8\uc77c\ud55c \uae34 \uc635\uc158 \uc774\ub984\uc744 \uc124\uba85\ud55c\ub2e4. \uae34 \uc635\uc158\uc744 \uad6c\uc131\ud558\ub294 \uc635\uc158\uc758 \ud558\ub098
\uc778 \uc778\uc218 longopts\ub294 \uadf8\ub4e4 \uad6c\uc870\uccb4\uc758 \ubc30\uc5f4\uc774 \ub418\uc5b4\uc57c\ub9cc \ud55c\ub2e4. \uadf8 \ubc30\uc5f4\uc740 0\uc73c\ub85c \ucc44\uc6cc\uc9c4 \uc694\uc18c\ub85c\uc368 \ub05d\ub09c
\ub2e4. struct option \uad6c\uc870\uccb4\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \ud544\ub4dc\ub97c \uac16\ub294\ub2e4.
const char *name
\uc774 \ud544\ub4dc\ub294 \uc635\uc158\uc758 \uc774\ub984\uc73c\ub85c \ubb38\uc790\uc5f4\uc774\ub2e4.
int has_arg
\uc774 \ud544\ub4dc\ub294 \uc635\uc158\uc774 \uc778\uc218\ub97c \ucde8\ud558\ub294\uc9c0 \ub610\ub294 \ucde8\ud558\uc9c0 \uc54a\ub294\uc9c0\uc758 \uc5ec\ubd80\ub97c \uc54c\ub9b0\ub2e4. \uadf8\uac83\uc740 \uc815\uc218\uc774\uace0 \uadf8\uacf3\uc5d0
\uc138 \uac1c\uc758 \ud569\ub9ac\uc801\uc778 \uac12\ub4e4\uc774 \uc788\ub2e4: no_argument, required argument, \uadf8\ub9ac\uace0 optional_argument
int *flag
int val
\uc774 \ud544\ub4dc\ub4e4\uc740 \uadf8 \uc635\uc158\uc774 \ubc1c\uc0dd\ud560 \ub54c \uc635\uc158\uc5d0 \ub300\ud558\uc5ec \uc5b4\ub5bb\uac8c \ubcf4\uace0\ub97c \ud558\uac70\ub098 \ub3d9\uc791\ud560\uac83\uc778\uc9c0\ub97c \uc81c\uc5b4\ud55c\ub2e4.
\ub9cc\uc77c flag\uac00 \ub110 \ud3ec\uc778\ud130\ub77c\uba74, val\uc740 \uc774 \uc635\uc158\uc744 \ub300\ud45c\ud558\ub294 \uac12\uc774\ub2e4. \uc885\uc885 \uadf8 \uac12\ub4e4\uc740 \ud2b9\uc815\ud55c \uae34 \uc635\uc158\ub4e4\uc758
\ub2e8\uc77c\ud568\uc744 \ud655\uc778\ud558\uae30 \uc704\ud574\uc11c \uc120\ud0dd\ub418\uc5b4\uc9c4\ub2e4. \ub9cc\uc77c \ud50c\ub798\uadf8\uac00 \ub110 \ud3ec\uc778\ud130\uac00 \uc544\ub2c8\ub77c\uba74, \uadf8\uac83\uc740 \uc774 \uc635\uc158\uc744
\uc704\ud55c \ud50c\ub798\uadf8\uc778 int\ud615 \ubcc0\uc218\uc758 \uc8fc\uc18c\uac00 \ub418\uc5b4\uc9c8 \uac83\uc774\ub2e4. val\uc548\uc758 \uac12\uc740 \ub098\ud0c0\ub09c \uc635\uc158\uc744 \uc9c0\uc801\ud558\ub3c4\ub85d \ud50c\ub798\uadf8
\uc548\uc5d0 \uc800\uc7a5\ud558\uae30 \uc704\ud55c \uac12\uc774\ub2e4.<\/P>\n
\ud568\uc218 :
int getopt__long (int argc, char **argv, const char *shortopts, struct
option *longopts, int *indexptr)<\/P>\n
\ubca1\ud130 argv ( \uae38\uc774\ub294 argc\uc774\ub2e4.)\ub85c\ubd80\ud130 \uc635\uc158\ub4e4\uc744 \ud574\ub3c5\ud55c\ub2e4. \uc778\uc218 shortopts\ub294 getopt\uac00 \ud574\ub3c5\ud560 \uc218 \uc788
\ub294 \ub9cc\ud07c\uc758 \uc9e7\uc740 \uc635\uc158\uc744 \ub098\ud0c0\ub0b4\uace0, \uc778\uc218 longopts\ub294 \ubc1b\uc544\ub4e4\uc774\uae30 \uc704\ud55c \uae34 \uc635\uc158\ub4e4\uc744 \ub098\ud0c0\ub0b8\ub2e4.
getopt_long\uc774 \uc9e7\uc740 \uc635\uc158\uc744 \ub9cc\ub0ac\uc744 \ub54c, \uadf8\uac83\uc740 getopt\uac00 \ud558\ub294\uac83\uacfc \uac19\uc740 \uc77c\uc744 \ud55c\ub2e4: \uadf8\uac83\uc740 \uc635\uc158\uc744 \uc704
\ud55c \ubb38\uc790 \ucf54\ub4dc\ub97c \ub9ac\ud134\ud558\uace0, optarg\uc5d0 \uc635\uc158 \uc778\uc218\ub4e4\uc744(\ub9cc\uc77c \uadf8\uac83\uc774\ud55c \uac1c\ub97c \uac00\uc9c4\ub2e4\uba74) \uc800\uc7a5\ud55c\ub2e4.
getopt_long\uac00 \uae34 \uc635\uc158\uc744 \ub9cc\ub0ac\uc744 \ub54c, \uadf8\uac83\uc740 \uadf8 \uc635\uc158\uc744 \uc815\uc758\ud558\ub294 flag \uc640 val \ud544\ub4dc\uc5d0 \uae30\ucd08\ud55c \ub3d9\uc791\ub4e4
\uc744 \ucde8\ud55c\ub2e4.
\ub9cc\uc77c flag\uac00 \ub110 \ud3ec\uc778\ud130\ub77c\uba74, getopt_long \uc740 \ubc1c\uacac\ud55c \uc635\uc158\uc744 \uc9c0\uc801\ud558\ub3c4\ub85d val\uc758 \ub0b4\uc6a9\uc744 \ub9ac\ud134\ud55c\ub2e4. \ub2f9\uc2e0
\uc774 \ub2e4\ub978 \uc758\ubbf8\ub97c \uac00\uc9c4 \uc635\uc158\uc744 \uc704\ud574\uc11c val \ud544\ub4dc\uc548\uc5d0 \ubcc4\uac1c\uc758 \uac12\ub4e4\uc744 \ubc30\uc5f4\ud558\uba74, \ub2f9\uc2e0\uc740 getopt_long\uc774 \ub9ac
\ud134\ud55c \ud6c4\uc5d0 \uadf8\ub4e4 \uac12\uc744 \ud574\ub3c5\ud560 \uc218 \uc788\ub2e4. \ub9cc\uc77c \uae34 \uc635\uc158\uc774 \uc9e7\uc740 \uc635\uc158\uacfc \ub3d9\uc77c\ud558\ub2e4\uba74, \ub2f9\uc2e0\uc740 \uc9ed\uc740 \uc635\uc158\uc758
\ubb38\uc790 \ucf54\ub4dc\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.
\ub9cc\uc77c flag\uac00 \ub110 \ud3ec\uc778\ud130\uac00 \uc544\ub2c8\ub77c\uba74, \ub2e8\uc9c0 \ud504\ub85c\uadf8\ub7a8\uc548\uc5d0\uc11c flag\uac00 \uc124\uc815\ub41c \uc774 \uc635\uc158\uc744 \uc758\ubbf8\ud55c\ub2e4. flag\ub294
\ub2f9\uc2e0\uc774 \uc815\uc758\ud55c int\ud615\uc758 \ubcc0\uc218\uc774\ub2e4. flag \ud544\ub4dc\uc548\uc5d0 \uadf8 \ud50c\ub798\uadf8\uc758 \uc8fc\uc18c\ub97c \uc800\uc7a5\ud558\ub77c. flag\uc5d0 \uc800\uc7a5\ud558\ub824\ub294
\uc635\uc158\uac12\uc744 val \ud544\ub4dc\uc548\uc5d0 \uc800\uc7a5\ud558\ub77c. \uc774 \uacbd\uc6b0, getopt_long\ub2940\uc744 \ub9ac\ud134\ud55c\ub2e4.
\uc5b4\ub5a4 \uae34 \uc635\uc158\uc5d0\uc11c, getopt_long\ub294 \ubc30\uc5f4 longopts\uc548\uc758 \uc635\uc158 \uc815\uc758\uc5d0 \ub300\ud55c \uc778\ub371\uc2a4\ub97c, *indexptr\uc5d0 \uc800\uc7a5\ud558
\uc5ec \uc54c\ub9b0\ub2e4. \ub2f9\uc2e0\uc740 longopts[*indexptr].name \uc73c\ub85c \uc635\uc158\uc758 \uc774\ub984\uc744 \uc5bb\uc744 \uc218 \uc788\ub2e4. \uadf8\ub798\uc11c \ub2f9\uc2e0\uc740 \uadf8\ub4e4
\uc758 val \ud544\ub4dc\uc548\uc5d0 \uc788\ub294 \uac12\uc774\ub098, \uadf8\ub4e4\uc758 \uc778\ub371\uc2a4\uc5d0 \uc758\ud574\uc11c \uae34 \uc635\uc158\ub4e4\uc744 \uad6c\ubd84\ud560 \uc218 \uc788\ub2e4. \ub2f9\uc2e0\uc740 \ud50c\ub798\uadf8
\ub97c \uc124\uc815\ud55c \uae34 \uc635\uc158\ub4e4\uc744 \uc774 \ubc29\ubc95\uc73c\ub85c \uad6c\ubd84\ud560 \uc218 \uc788\ub2e4.
\uc5b4\ub5a4 \uae34 \uc635\uc158\uc774 \uc778\uc218\ub97c \uac00\uc9c8 \ub54c, getopt_long\ub294 \ub9ac\ud134\ud558\uae30 \uc804\uc5d0 \ubcc0\uc218 optarg\uc548\uc5d0 \uc778\uc218\uac12\uc744 \uc800\uc7a5\ud55c\ub2e4.
\uc5b4\ub5a4 \uc635\uc158\uc774 \uc544\ubb34\ub7f0 \uc778\uc218\ub97c \uac00\uc9c0\uc9c0 \uc54a\uc744 \ub54c, optarg\uc548\uc758 \uac12\uc740 \ub110 \ud3ec\uc778\ud130\uc774\ub2e4. \uc774\uac83\uc740 \uacf5\uae09\ub41c\uc778\uc218\uac00
\uc635\uc158\uc744 \uac00\uc84c\ub294\uc9c0 \uc544\ub2cc\uc9c0\uc5d0 \ub300\ud55c \uc5ec\ubd80\ub97c \ub2f9\uc2e0\uc5d0\uac8c \uc54c\ub9ac\ub294 \ubc29\ubc95\uc778 \uac83\uc774\ub2e4. getopt_long\ub294 \ub354 \uc774\uc0c1 \ucc98
\ub9ac\ud560 \uc635\uc158\ub4e4\uc774 \uc5c6\uc744 \ub54c, -1\uc744 \ub9ac\ud134\ud558\uace0, \ub2e4\uc74c \ub0a8\uc544\uc788\ub294 \uc778\uc218\uc758 argv \uc778\ub371\uc2a4\ub97c \ubcc0\uc218 optind \uc548\uc5d0 \ub0a8\uae34
\ub2e4.
22.1.5 \uae34 \uc635\uc158\ub4e4\uc758 \uad6c\ubd84\ubd84\uc11d\uc5d0 \ub300\ud55c \uc608\uc81c.
#include <stdio.h>
\/* \ud50c\ub798\uadf8\ub294 `--verbose' \uc5d0 \uc758\ud574 \uc124\uc815\ud55c\ub2e4. *\/
static int verbose_flag;
int
main (argc, argv)
int argc;
char **argv;
{
int c;
while (1)
{
static struct option long_options[] =
{
\/* \uadf8\ub4e4 \uc635\uc158\ub4e4\uc740 \ud50c\ub798\uadf8\ub97c \uc124\uc815\ud55c\ub2e4.*\/
{\"verbose\", 0, &verbose_flag, 1},
{\"brief\", 0, &verbose_flag, 0},
\/* \uadf8\ub4e4 \uc635\uc158\ub4e4\uc740 \ud50c\ub798\uadf8\ub97c \uc124\uc815\ud558\uc9c0 \uc54a\ub294\ub2e4. \uc6b0\ub9ac\ub294 \uadf8\ub4e4\uc758 \uc778\ub371\uc2a4\uc5d0 \uc758\ud574 \uadf8\ub4e4\uc744 \uad6c\ubd84\ud55c\ub2e4. *\/
{\"add\", 1, 0, 0},
{\"append\", 0, 0, 0},
{\"delete\", 1, 0, 0},
{\"create\", 0, 0, 0},
{\"file\", 1, 0, 0},
{0, 0, 0, 0}
};
\/* getopt_long\ub294 \uc774\uacf3\uc5d0 \uc635\uc158 \uc778\ub371\uc2a4\ub97c \uc800\uc7a5\ud55c\ub2e4. *\/
int option_index = 0;
c = getopt_long (argc, argv, \"abc:d:\", long_options, &option_index);
\/* \uc635\uc158\ub4e4\uc758 \ub05d\uc744 \uac80\ucd9c\ud55c\ub2e4. *\/
if (c == -1)
break;
switch (c)
{
case 0:
\/* \ub9cc\uc77c \uc774 \uc635\uc158\uc774 \ud50c\ub798\uadf8\ub97c \uc124\uc815\ud558\uba74, \uc9c0\uae08 \uc544\ubb34\ub7f0 \uc77c\ub3c4 \ud558\uc9c0 \ub9d0\uc544\ub77c. *\/
if (long_options[option_index].flag != 0)
break;
printf(\"option %s\", long_options[option_index].name);
if (optarg)
printf(\" with arg %s\", optarg);
printf(\"\\n\");
break;
case 'a':
puts(\"option -a\\n\");
break;
case 'b':
puts(\"option -b\\n\");
break;
case 'c':
printf(\"option -c with value `%s'\\n\", optarg);
break;
case 'd':
printf(\"option -d with value `%s'\\n\", optarg);
break;
case '?':
\/* getopt_long\ub294 \uc774\ubbf8 \uc5d0\ub7ec \uba54\uc2dc\uc9c0\ub97c \ud504\ub9b0\ud2b8\ud588\ub2e4. *\/
break;
default:
abort ();
}
}
\/* \uadf8\ub4e4\uc774 \ub9de\ucd94\ucce4\ub358 \uac83\uc73c\ub85c `--verbose'\uc640 `--brief'\ub97c \ubcf4\uace0\ud558\ub294 \ub300\uc2e0\uc5d0, \uc6b0\ub9ac\ub294 \uadf8\ub4e4\ub85c\ubd80\ud130 \ub098\uc628 \uacb0
\uacfc\ub85c \ub9c8\uc9c0\ub9c9 \uc0c1\ud669\uc744 \ubcf4\uace0\ud55c\ub2e4. *\/
if (verbose_flag)
puts (\"verbose flag is set\");
\/* \ub0a8\uc544\uc788\ub294 \ucf54\ub9e8\ub4dc \ub77c\uc778 \uc778\uc218\ub4e4\uc744( \uc635\uc158\uc774 \uc5c6\ub294) \ucd9c\ub825\ud558\ub77c. *\/
if (optind < argc)
{
printf (\"non-option ARGV-elements: \");
while (optind < argc)
printf (\"%s \", argv[optind++]);
putchar ('\\n');
}
exit (0);
}
\n","protected":false},"excerpt":{"rendered":"
\uc774\ubc88\uc5d0\ub294 getopt \ud568\uc218\ub97c \uc5b4\ub5bb\uac8c \ud638\ucd9c\ud558\ub294\uc9c0\uc5d0 \ub300\ud574\uc11c \uc790\uc138\ud788 \uc124\uba85\ud55c\ub2e4. \uc774 \uae30\ub2a5\uc744 \uc0ac\uc6a9\ud558\uae30 \uc704\ud574\uc11c,\ub2f9\uc2e0\uc758 \ud504\ub85c\uadf8\ub7a8\uc5d0 \ud5e4\ub354\ud30c\uc77c `unistd.h’\uc744 \ud3ec\ud568\uc2dc\ucf1c\uc57c\ub9cc \ud55c\ub2e4.\ubcc0\uc218 : int opterr\ub9cc\uc77c \uc774 \ubcc0\uc218\uc758 \uac12\uc774 0\uc774 \uc544\ub2c8\uba74, getopt\ub294 \ub9cc\uc77c \uc54c\uc9c0\ubabb\ud558\ub294 \uc635\uc158 \ubb38\uc790\uac00 \ub4e4\uc5b4\uc624\uac70\ub098 \uc778\uc218\ub97c \ud544\uc694\ub85c\ud558\ub294 \uc635\uc158\uc774 \uc635\uc158\uc744 \uac16\uace0\uc788\uc9c0 \uc54a\ub2e4\uba74 \ud45c\uc900 \uc5d0\ub7ec \uc2a4\ud2b8\ub9bc\uc5d0 \uc5d0\ub7ec\uba54\uc138\uc9c0\ub97c \ud504\ub9b0\ud2b8\ud55c\ub2e4. \uc774\uac83\uc740 \ub514\ud3f4\ud2b8\ub3d9\uc791\uc774\ub2e4. \ub9cc\uc77c \ub2f9\uc2e0\uc774 \uc774 \ubcc0\uc218\ub97c 0\uc73c\ub85c \uc124\uc815\ud558\uba74, getopt\ub294 \uc544\ubb34\ub7f0 \uba54\uc2dc\uc9c0\ub3c4 \ud504\ub9b0\ud2b8\ud558\uc9c0\ub294 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[22],"tags":[],"class_list":["post-89","post","type-post","status-publish","format-standard","hentry","category-development_unix"],"_links":{"self":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/89","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=89"}],"version-history":[{"count":0,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/89\/revisions"}],"wp:attachment":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=89"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=89"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=89"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}