1 /* getopt.c - Parse command-line options
2 *
3 * Copyright 2019 The Android Open Source Project
4
5 USE_GETOPT(NEWTOY(getopt, "^a(alternative)n:(name)o:(options)l*(long)(longoptions)Tu", TOYFLAG_USR|TOYFLAG_BIN))
6
7 config GETOPT
8 bool "getopt"
9 default n
10 help
11 usage: getopt [OPTIONS] [--] ARG...
12
13 Parse command-line options for use in shell scripts.
14
15 -a Allow long options starting with a single -.
16 -l OPTS Specify long options.
17 -n NAME Command name for error messages.
18 -o OPTS Specify short options.
19 -T Test whether this is a modern getopt.
20 -u Output options unquoted.
21 */
22
23 #define FOR_getopt
24 #include "toys.h"
25
26 GLOBALS(
27 struct arg_list *l;
28 char *o, *n;
29 )
30
out(char * s)31 static void out(char *s)
32 {
33 if (FLAG(u)) printf(" %s", s);
34 else {
35 printf(" '");
36 for (; *s; s++) {
37 if (*s == '\'') printf("'\\''");
38 else putchar(*s);
39 }
40 printf("'");
41 }
42 }
43
parse_long_opt(void * data,char * str,int len)44 static char *parse_long_opt(void *data, char *str, int len)
45 {
46 struct option **lopt_ptr = data, *lopt = *lopt_ptr;
47
48 // Trailing : or :: means this option takes a required or optional argument.
49 // no_argument = 0, required_argument = 1, optional_argument = 2.
50 for (lopt->has_arg = 0; len>0 && str[len-1] == ':'; lopt->has_arg++) len--;
51 if (!len || lopt->has_arg>2) return str;
52
53 lopt->name = xstrndup(str, len);
54
55 (*lopt_ptr)++;
56 return 0;
57 }
58
getopt_main(void)59 void getopt_main(void)
60 {
61 int argc = toys.optc+1;
62 char **argv = xzalloc(sizeof(char *)*(argc+1));
63 struct option *lopts = xzalloc(sizeof(struct option)*argc), *lopt = lopts;
64 int i = 0, j = 0, ch;
65
66 if (FLAG(T)) {
67 toys.exitval = 4;
68 return;
69 }
70
71 comma_args(TT.l, &lopt, "bad -l", parse_long_opt);
72 argv[j++] = TT.n ? TT.n : "getopt";
73
74 // Legacy mode: don't quote output and take the first argument as OPTSTR.
75 if (!FLAG(o)) {
76 toys.optflags |= FLAG_u;
77 TT.o = toys.optargs[i++];
78 if (!TT.o) error_exit("no OPTSTR");
79 --argc;
80 }
81
82 while (i<toys.optc) argv[j++] = toys.optargs[i++];
83
84 // BSD getopts don't honor argv[0] (for -n), so handle errors ourselves.
85 opterr = 0;
86 optind = 1;
87 while ((ch = (FLAG(a)?getopt_long_only:getopt_long)(argc, argv, TT.o,
88 lopts, &i)) != -1) {
89 if (ch == '?') {
90 fprintf(stderr, "%s: invalid option '%c'\n", argv[0], optopt);
91 toys.exitval = 1;
92 } else if (!ch) {
93 printf(" --%s", lopts[i].name);
94 if (lopts[i].has_arg) out(optarg ? optarg : "");
95 } else {
96 printf(" -%c", ch);
97 if (optarg) out(optarg);
98 }
99 }
100
101 printf(" --");
102 for (; optind<argc; optind++) out(argv[optind]);
103 printf("\n");
104 }
105