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/* getopt.c - Parse command-line options
*
* Copyright 2019 The Android Open Source Project
USE_GETOPT(NEWTOY(getopt, "^a(alternative)n:(name)o:(options)l*(long)(longoptions)Tu", TOYFLAG_USR|TOYFLAG_BIN))
config GETOPT
bool "getopt"
default y
help
usage: getopt [OPTIONS] [--] ARG...
Parse command-line options for use in shell scripts.
-a Allow long options starting with a single -.
-l OPTS Specify long options.
-n NAME Command name for error messages.
-o OPTS Specify short options.
-T Test whether this is a modern getopt.
-u Output options unquoted.
*/
#define FOR_getopt
#include "toys.h"
GLOBALS(
struct arg_list *l;
char *o, *n;
)
static void out(char *s)
{
if (FLAG(u)) printf(" %s", s);
else {
printf(" '");
for (; *s; s++) {
if (*s == '\'') printf("'\\''");
else putchar(*s);
}
printf("'");
}
}
static char *parse_long_opt(void *data, char *str, int len)
{
struct option **lopt_ptr = data, *lopt = *lopt_ptr;
// Trailing : or :: means this option takes a required or optional argument.
// no_argument = 0, required_argument = 1, optional_argument = 2.
for (lopt->has_arg = 0; len>0 && str[len-1] == ':'; lopt->has_arg++) len--;
if (!len || lopt->has_arg>2) return str;
lopt->name = xstrndup(str, len);
(*lopt_ptr)++;
return 0;
}
void getopt_main(void)
{
int argc = toys.optc+1;
char **argv = xzalloc(sizeof(char *)*(argc+1));
struct option *lopts = xzalloc(sizeof(struct option)*argc), *lopt = lopts;
int i = 0, j = 0, ch;
if (FLAG(T)) {
toys.exitval = 4;
return;
}
comma_args(TT.l, &lopt, "bad -l", parse_long_opt);
argv[j++] = TT.n ? TT.n : "getopt";
// Legacy mode: don't quote output and take the first argument as OPTSTR.
if (!FLAG(o)) {
toys.optflags |= FLAG_u;
TT.o = toys.optargs[i++];
if (!TT.o) error_exit("no OPTSTR");
--argc;
}
while (i<toys.optc) argv[j++] = toys.optargs[i++];
// BSD getopts don't honor argv[0] (for -n), so handle errors ourselves.
opterr = 0;
optind = 1;
while ((ch = (FLAG(a)?getopt_long_only:getopt_long)(argc, argv, TT.o,
lopts, &i)) != -1) {
if (ch == '?') {
fprintf(stderr, "%s: invalid option '%c'\n", argv[0], optopt);
toys.exitval = 1;
} else if (!ch) {
printf(" --%s", lopts[i].name);
if (lopts[i].has_arg) out(optarg ? optarg : "");
} else {
printf(" -%c", ch);
if (optarg) out(optarg);
}
}
printf(" --");
for (; optind<argc; optind++) out(argv[optind]);
printf("\n");
}
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