busybox/util-linux/getopt.c

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/* vi: set sw=4 ts=4: */
/*
* getopt.c - Enhanced implementation of BSD getopt(1)
* Copyright (c) 1997, 1998, 1999, 2000 Frodo Looijaard <frodol@dds.nl>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/*
* Version 1.0-b4: Tue Sep 23 1997. First public release.
* Version 1.0: Wed Nov 19 1997.
* Bumped up the version number to 1.0
* Fixed minor typo (CSH instead of TCSH)
* Version 1.0.1: Tue Jun 3 1998
* Fixed sizeof instead of strlen bug
* Bumped up the version number to 1.0.1
* Version 1.0.2: Thu Jun 11 1998 (not present)
* Fixed gcc-2.8.1 warnings
* Fixed --version/-V option (not present)
* Version 1.0.5: Tue Jun 22 1999
* Make -u option work (not present)
* Version 1.0.6: Tue Jun 27 2000
* No important changes
* Version 1.1.0: Tue Jun 30 2000
* Added NLS support (partly written by Arkadiusz Mickiewicz
* <misiek@misiek.eu.org>)
* Ported to Busybox - Alfred M. Szmidt <ams@trillian.itslinux.org>
* Removed --version/-V and --help/-h
* Removed parse_error(), using bb_error_msg() from Busybox instead
* Replaced our_malloc with xmalloc and our_realloc with xrealloc
*/
//config:config GETOPT
//config: bool "getopt (5.6 kb)"
//config: default y
//config: help
//config: The getopt utility is used to break up (parse) options in command
//config: lines to make it easy to write complex shell scripts that also check
//config: for legal (and illegal) options. If you want to write horribly
//config: complex shell scripts, or use some horribly complex shell script
//config: written by others, this utility may be for you. Most people will
//config: wisely leave this disabled.
//config:
//config:config FEATURE_GETOPT_LONG
//config: bool "Support -l LONGOPTs"
getopt32: remove applet_long_options FEATURE_GETOPT_LONG made dependent on LONG_OPTS. The folloving options are removed, now LONG_OPTS enables long options for affected applets: FEATURE_ENV_LONG_OPTIONS FEATURE_EXPAND_LONG_OPTIONS FEATURE_UNEXPAND_LONG_OPTIONS FEATURE_MKDIR_LONG_OPTIONS FEATURE_MV_LONG_OPTIONS FEATURE_RMDIR_LONG_OPTIONS FEATURE_ADDGROUP_LONG_OPTIONS FEATURE_ADDUSER_LONG_OPTIONS FEATURE_HWCLOCK_LONG_OPTIONS FEATURE_NSENTER_LONG_OPTS FEATURE_CHCON_LONG_OPTIONS FEATURE_RUNCON_LONG_OPTIONS They either had a small number of long options, or their long options are essential. Example: upstream addgroup and adduser have ONLY longopts, we should probably go further and get rid of non-standard short options. To this end, make addgroup and adduser "select LONG_OPTS". We had this breakage caused by us even in our own package! #if ENABLE_LONG_OPTS || !ENABLE_ADDGROUP /* We try to use --gid, not -g, because "standard" addgroup * has no short option -g, it has only long --gid. */ argv[1] = (char*)"--gid"; #else /* Breaks if system in fact does NOT use busybox addgroup */ argv[1] = (char*)"-g"; #endif xargs: its lone longopt no longer depends on DESKTOP, only on LONG_OPTS. hwclock TODO: get rid of incompatible -t, -l aliases to --systz, --localtime Shorten help texts by omitting long option when short opt alternative exists. Reduction of size comes from the fact that store of an immediate (an address of longopts) to a fixed address (global variable) is a longer insn than pushing that immediate or passing it in a register. This effect is CPU-agnostic. function old new delta getopt32 1350 22 -1328 vgetopt32 - 1318 +1318 getopt32long - 24 +24 tftpd_main 562 567 +5 scan_recursive 376 380 +4 collect_cpu 545 546 +1 date_main 1096 1095 -1 hostname_main 262 259 -3 uname_main 259 255 -4 setpriv_main 362 358 -4 rmdir_main 191 187 -4 mv_main 562 558 -4 ipcalc_main 548 544 -4 ifenslave_main 641 637 -4 gzip_main 192 188 -4 gunzip_main 77 73 -4 fsfreeze_main 81 77 -4 flock_main 318 314 -4 deluser_main 337 333 -4 cp_main 374 370 -4 chown_main 175 171 -4 applet_long_options 4 - -4 xargs_main 894 889 -5 wget_main 2540 2535 -5 udhcpc_main 2767 2762 -5 touch_main 436 431 -5 tar_main 1014 1009 -5 start_stop_daemon_main 1033 1028 -5 sed_main 682 677 -5 script_main 1082 1077 -5 run_parts_main 330 325 -5 rtcwake_main 459 454 -5 od_main 2169 2164 -5 nl_main 201 196 -5 modprobe_main 773 768 -5 mkdir_main 160 155 -5 ls_main 568 563 -5 install_main 773 768 -5 hwclock_main 411 406 -5 getopt_main 622 617 -5 fstrim_main 256 251 -5 env_main 198 193 -5 dumpleases_main 635 630 -5 dpkg_main 3991 3986 -5 diff_main 1355 1350 -5 cryptpw_main 233 228 -5 cpio_main 593 588 -5 conspy_main 1135 1130 -5 chpasswd_main 313 308 -5 adduser_main 887 882 -5 addgroup_main 416 411 -5 ftpgetput_main 351 345 -6 get_terminal_width_height 242 234 -8 expand_main 690 680 -10 static.expand_longopts 18 - -18 static.unexpand_longopts 27 - -27 mkdir_longopts 28 - -28 env_longopts 30 - -30 static.ifenslave_longopts 34 - -34 mv_longopts 46 - -46 static.rmdir_longopts 48 - -48 packed_usage 31739 31687 -52 ------------------------------------------------------------------------------ (add/remove: 2/8 grow/shrink: 3/49 up/down: 1352/-1840) Total: -488 bytes text data bss dec hex filename 915681 485 6880 923046 e15a6 busybox_old 915428 485 6876 922789 e14a5 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-08 20:08:18 +05:30
//config: default y
//config: depends on GETOPT && LONG_OPTS
//config: help
//config: Enable support for long options (option -l).
//applet:IF_GETOPT(APPLET_NOEXEC(getopt, getopt, BB_DIR_BIN, BB_SUID_DROP, getopt))
//kbuild:lib-$(CONFIG_GETOPT) += getopt.o
//usage:#define getopt_trivial_usage
//usage: "[OPTIONS] [--] OPTSTRING PARAMS"
//usage:#define getopt_full_usage "\n\n"
//usage: IF_FEATURE_GETOPT_LONG(
//usage: " -a Allow long options starting with single -\n"
//usage: " -l LOPT[,...] Long options to recognize\n"
//usage: )
//usage: " -n PROGNAME The name under which errors are reported"
//usage: "\n -o OPTSTRING Short options to recognize"
//usage: "\n -q No error messages on unrecognized options"
//usage: "\n -Q No normal output"
//usage: "\n -s SHELL Set shell quoting conventions"
//usage: "\n -T Version test (exits with 4)"
//usage: "\n -u Don't quote output"
//usage: IF_FEATURE_GETOPT_LONG( /* example uses -l, needs FEATURE_GETOPT_LONG */
//usage: "\n"
//usage: "\nExample:"
//usage: "\n"
//usage: "\nO=`getopt -l bb: -- ab:c:: \"$@\"` || exit 1"
//usage: "\neval set -- \"$O\""
//usage: "\nwhile true; do"
//usage: "\n case \"$1\" in"
//usage: "\n -a) echo A; shift;;"
//usage: "\n -b|--bb) echo \"B:'$2'\"; shift 2;;"
//usage: "\n -c) case \"$2\" in"
//usage: "\n \"\") echo C; shift 2;;"
//usage: "\n *) echo \"C:'$2'\"; shift 2;;"
//usage: "\n esac;;"
//usage: "\n --) shift; break;;"
//usage: "\n *) echo Error; exit 1;;"
//usage: "\n esac"
//usage: "\ndone"
//usage: )
//usage:
//usage:#define getopt_example_usage
//usage: "$ cat getopt.test\n"
//usage: "#!/bin/sh\n"
//usage: "GETOPT=`getopt -o ab:c:: --long a-long,b-long:,c-long:: \\\n"
//usage: " -n 'example.busybox' -- \"$@\"`\n"
//usage: "if [ $? != 0 ]; then exit 1; fi\n"
//usage: "eval set -- \"$GETOPT\"\n"
//usage: "while true; do\n"
//usage: " case $1 in\n"
//usage: " -a|--a-long) echo \"Option a\"; shift;;\n"
//usage: " -b|--b-long) echo \"Option b, argument '$2'\"; shift 2;;\n"
//usage: " -c|--c-long)\n"
//usage: " case \"$2\" in\n"
//usage: " \"\") echo \"Option c, no argument\"; shift 2;;\n"
//usage: " *) echo \"Option c, argument '$2'\"; shift 2;;\n"
//usage: " esac;;\n"
//usage: " --) shift; break;;\n"
//usage: " *) echo \"Internal error!\"; exit 1;;\n"
//usage: " esac\n"
//usage: "done\n"
#if ENABLE_FEATURE_GETOPT_LONG
# include <getopt.h>
#endif
#include "libbb.h"
/* NON_OPT is the code that is returned when a non-option is found in '+'
mode */
enum {
NON_OPT = 1,
#if ENABLE_FEATURE_GETOPT_LONG
/* LONG_OPT is the code that is returned when a long option is found. */
LONG_OPT = 2
#endif
};
/* For finding activated option flags. Must match getopt32 call! */
enum {
OPT_o = 0x1, // -o
OPT_n = 0x2, // -n
OPT_q = 0x4, // -q
OPT_Q = 0x8, // -Q
OPT_s = 0x10, // -s
OPT_T = 0x20, // -T
OPT_u = 0x40, // -u
#if ENABLE_FEATURE_GETOPT_LONG
OPT_a = 0x80, // -a
OPT_l = 0x100, // -l
#endif
SHELL_IS_TCSH = 0x8000, /* hijack this bit for other purposes */
};
/* 0 is getopt_long, 1 is getopt_long_only */
#define alternative (option_mask32 & OPT_a)
#define quiet_errors (option_mask32 & OPT_q)
#define quiet_output (option_mask32 & OPT_Q)
#define quote (!(option_mask32 & OPT_u))
#define shell_TCSH (option_mask32 & SHELL_IS_TCSH)
/*
* This function 'normalizes' a single argument: it puts single quotes around
* it and escapes other special characters. If quote is false, it just
* returns its argument.
* Bash only needs special treatment for single quotes; tcsh also recognizes
* exclamation marks within single quotes, and nukes whitespace.
* This function returns a pointer to a buffer that is overwritten by
* each call.
*/
static const char *normalize(const char *arg)
{
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char *bufptr;
#if ENABLE_FEATURE_CLEAN_UP
static char *BUFFER = NULL;
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free(BUFFER);
#else
char *BUFFER;
#endif
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if (!quote) { /* Just copy arg */
BUFFER = xstrdup(arg);
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return BUFFER;
}
/* Each character in arg may take up to four characters in the result:
For a quote we need a closing quote, a backslash, a quote and an
opening quote! We need also the global opening and closing quote,
and one extra character for '\0'. */
BUFFER = xmalloc(strlen(arg)*4 + 3);
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bufptr = BUFFER;
*bufptr ++= '\'';
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while (*arg) {
if (*arg == '\'') {
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/* Quote: replace it with: '\'' */
*bufptr ++= '\'';
*bufptr ++= '\\';
*bufptr ++= '\'';
*bufptr ++= '\'';
} else if (shell_TCSH && *arg == '!') {
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/* Exclamation mark: replace it with: \! */
*bufptr ++= '\'';
*bufptr ++= '\\';
*bufptr ++= '!';
*bufptr ++= '\'';
} else if (shell_TCSH && *arg == '\n') {
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/* Newline: replace it with: \n */
*bufptr ++= '\\';
*bufptr ++= 'n';
} else if (shell_TCSH && isspace(*arg)) {
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/* Non-newline whitespace: replace it with \<ws> */
*bufptr ++= '\'';
*bufptr ++= '\\';
*bufptr ++= *arg;
*bufptr ++= '\'';
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} else
/* Just copy */
*bufptr ++= *arg;
arg++;
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}
*bufptr ++= '\'';
*bufptr ++= '\0';
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return BUFFER;
}
/*
* Generate the output. argv[0] is the program name (used for reporting errors).
* argv[1..] contains the options to be parsed. argc must be the number of
* elements in argv (ie. 1 if there are no options, only the program name),
* optstr must contain the short options, and longopts the long options.
* Other settings are found in global variables.
*/
#if !ENABLE_FEATURE_GETOPT_LONG
#define generate_output(argv,argc,optstr,longopts) \
generate_output(argv,argc,optstr)
#endif
static int generate_output(char **argv, int argc, const char *optstr, const struct option *longopts)
{
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int exit_code = 0; /* We assume everything will be OK */
if (quiet_errors) /* No error reporting from getopt(3) */
opterr = 0;
/* We used it already in main() in getopt32(),
* we *must* reset getopt(3): */
GETOPT_RESET();
while (1) {
#if ENABLE_FEATURE_GETOPT_LONG
int longindex;
int opt = alternative
? getopt_long_only(argc, argv, optstr, longopts, &longindex)
: getopt_long(argc, argv, optstr, longopts, &longindex)
;
#else
int opt = getopt(argc, argv, optstr);
#endif
if (opt == -1)
break;
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if (opt == '?' || opt == ':' )
exit_code = 1;
else if (!quiet_output) {
#if ENABLE_FEATURE_GETOPT_LONG
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if (opt == LONG_OPT) {
printf(" --%s", longopts[longindex].name);
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if (longopts[longindex].has_arg)
printf(" %s",
normalize(optarg ? optarg : ""));
} else
#endif
if (opt == NON_OPT)
printf(" %s", normalize(optarg));
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else {
const char *charptr;
printf(" -%c", opt);
charptr = strchr(optstr, opt);
if (charptr && *++charptr == ':')
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printf(" %s",
normalize(optarg ? optarg : ""));
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}
}
}
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if (!quiet_output) {
unsigned idx;
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printf(" --");
idx = optind;
while (argv[idx])
printf(" %s", normalize(argv[idx++]));
bb_putchar('\n');
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}
return exit_code;
}
#if ENABLE_FEATURE_GETOPT_LONG
/*
* Register several long options. options is a string of long options,
* separated by commas or whitespace.
* This nukes options!
*/
static struct option *add_long_options(struct option *long_options, char *options)
{
int long_nr = 0;
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int arg_opt, tlen;
char *tokptr = strtok(options, ", \t\n");
if (long_options)
while (long_options[long_nr].name)
long_nr++;
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while (tokptr) {
arg_opt = no_argument;
tlen = strlen(tokptr);
if (tlen) {
tlen--;
if (tokptr[tlen] == ':') {
arg_opt = required_argument;
if (tlen && tokptr[tlen-1] == ':') {
tlen--;
arg_opt = optional_argument;
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}
tokptr[tlen] = '\0';
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if (tlen == 0)
bb_error_msg_and_die("empty long option specified");
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}
long_options = xrealloc_vector(long_options, 4, long_nr);
long_options[long_nr].has_arg = arg_opt;
/*long_options[long_nr].flag = NULL; - xrealloc_vector did it */
long_options[long_nr].val = LONG_OPT;
long_options[long_nr].name = xstrdup(tokptr);
long_nr++;
/*memset(&long_options[long_nr], 0, sizeof(long_options[0])); - xrealloc_vector did it */
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}
tokptr = strtok(NULL, ", \t\n");
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}
return long_options;
}
#endif
static void set_shell(const char *new_shell)
{
if (strcmp(new_shell, "bash") == 0 || strcmp(new_shell, "sh") == 0)
return;
if (strcmp(new_shell, "tcsh") == 0 || strcmp(new_shell, "csh") == 0)
option_mask32 |= SHELL_IS_TCSH;
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else
bb_error_msg("unknown shell '%s', assuming bash", new_shell);
}
/* Exit codes:
* 0) No errors, successful operation.
* 1) getopt(3) returned an error.
* 2) A problem with parameter parsing for getopt(1).
* 3) Internal error, out of memory
* 4) Returned for -T
*/
#if ENABLE_FEATURE_GETOPT_LONG
static const char getopt_longopts[] ALIGN1 =
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"options\0" Required_argument "o"
"longoptions\0" Required_argument "l"
"quiet\0" No_argument "q"
"quiet-output\0" No_argument "Q"
"shell\0" Required_argument "s"
"test\0" No_argument "T"
"unquoted\0" No_argument "u"
"alternative\0" No_argument "a"
"name\0" Required_argument "n"
;
#endif
int getopt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int getopt_main(int argc, char **argv)
{
int n;
char *optstr = NULL;
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char *name = NULL;
unsigned opt;
const char *compatible;
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char *s_arg;
#if ENABLE_FEATURE_GETOPT_LONG
struct option *long_options = NULL;
llist_t *l_arg = NULL;
#endif
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compatible = getenv("GETOPT_COMPATIBLE"); /* used as yes/no flag */
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if (!argv[1]) {
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if (compatible) {
/* For some reason, the original getopt gave no error
* when there were no arguments. */
puts(" --");
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return 0;
}
bb_error_msg_and_die("missing optstring argument");
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}
if (argv[1][0] != '-' || compatible) {
char *s = argv[1];
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option_mask32 |= OPT_u; /* quoting off */
s = xstrdup(s + strspn(s, "-+"));
argv[1] = argv[0];
return generate_output(argv+1, argc-1, s, long_options);
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}
#if !ENABLE_FEATURE_GETOPT_LONG
opt = getopt32(argv, "+o:n:qQs:Tu", &optstr, &name, &s_arg);
#else
getopt32: remove applet_long_options FEATURE_GETOPT_LONG made dependent on LONG_OPTS. The folloving options are removed, now LONG_OPTS enables long options for affected applets: FEATURE_ENV_LONG_OPTIONS FEATURE_EXPAND_LONG_OPTIONS FEATURE_UNEXPAND_LONG_OPTIONS FEATURE_MKDIR_LONG_OPTIONS FEATURE_MV_LONG_OPTIONS FEATURE_RMDIR_LONG_OPTIONS FEATURE_ADDGROUP_LONG_OPTIONS FEATURE_ADDUSER_LONG_OPTIONS FEATURE_HWCLOCK_LONG_OPTIONS FEATURE_NSENTER_LONG_OPTS FEATURE_CHCON_LONG_OPTIONS FEATURE_RUNCON_LONG_OPTIONS They either had a small number of long options, or their long options are essential. Example: upstream addgroup and adduser have ONLY longopts, we should probably go further and get rid of non-standard short options. To this end, make addgroup and adduser "select LONG_OPTS". We had this breakage caused by us even in our own package! #if ENABLE_LONG_OPTS || !ENABLE_ADDGROUP /* We try to use --gid, not -g, because "standard" addgroup * has no short option -g, it has only long --gid. */ argv[1] = (char*)"--gid"; #else /* Breaks if system in fact does NOT use busybox addgroup */ argv[1] = (char*)"-g"; #endif xargs: its lone longopt no longer depends on DESKTOP, only on LONG_OPTS. hwclock TODO: get rid of incompatible -t, -l aliases to --systz, --localtime Shorten help texts by omitting long option when short opt alternative exists. Reduction of size comes from the fact that store of an immediate (an address of longopts) to a fixed address (global variable) is a longer insn than pushing that immediate or passing it in a register. This effect is CPU-agnostic. function old new delta getopt32 1350 22 -1328 vgetopt32 - 1318 +1318 getopt32long - 24 +24 tftpd_main 562 567 +5 scan_recursive 376 380 +4 collect_cpu 545 546 +1 date_main 1096 1095 -1 hostname_main 262 259 -3 uname_main 259 255 -4 setpriv_main 362 358 -4 rmdir_main 191 187 -4 mv_main 562 558 -4 ipcalc_main 548 544 -4 ifenslave_main 641 637 -4 gzip_main 192 188 -4 gunzip_main 77 73 -4 fsfreeze_main 81 77 -4 flock_main 318 314 -4 deluser_main 337 333 -4 cp_main 374 370 -4 chown_main 175 171 -4 applet_long_options 4 - -4 xargs_main 894 889 -5 wget_main 2540 2535 -5 udhcpc_main 2767 2762 -5 touch_main 436 431 -5 tar_main 1014 1009 -5 start_stop_daemon_main 1033 1028 -5 sed_main 682 677 -5 script_main 1082 1077 -5 run_parts_main 330 325 -5 rtcwake_main 459 454 -5 od_main 2169 2164 -5 nl_main 201 196 -5 modprobe_main 773 768 -5 mkdir_main 160 155 -5 ls_main 568 563 -5 install_main 773 768 -5 hwclock_main 411 406 -5 getopt_main 622 617 -5 fstrim_main 256 251 -5 env_main 198 193 -5 dumpleases_main 635 630 -5 dpkg_main 3991 3986 -5 diff_main 1355 1350 -5 cryptpw_main 233 228 -5 cpio_main 593 588 -5 conspy_main 1135 1130 -5 chpasswd_main 313 308 -5 adduser_main 887 882 -5 addgroup_main 416 411 -5 ftpgetput_main 351 345 -6 get_terminal_width_height 242 234 -8 expand_main 690 680 -10 static.expand_longopts 18 - -18 static.unexpand_longopts 27 - -27 mkdir_longopts 28 - -28 env_longopts 30 - -30 static.ifenslave_longopts 34 - -34 mv_longopts 46 - -46 static.rmdir_longopts 48 - -48 packed_usage 31739 31687 -52 ------------------------------------------------------------------------------ (add/remove: 2/8 grow/shrink: 3/49 up/down: 1352/-1840) Total: -488 bytes text data bss dec hex filename 915681 485 6880 923046 e15a6 busybox_old 915428 485 6876 922789 e14a5 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-08 20:08:18 +05:30
opt = getopt32long(argv, "+o:n:qQs:Tual:*", getopt_longopts,
&optstr, &name, &s_arg, &l_arg);
/* Effectuate the read options for the applet itself */
while (l_arg) {
long_options = add_long_options(long_options, llist_pop(&l_arg));
}
#endif
if (opt & OPT_s) {
set_shell(s_arg);
}
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if (opt & OPT_T) {
return 4;
}
/* All options controlling the applet have now been parsed */
n = optind - 1;
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if (!optstr) {
optstr = argv[++n];
if (!optstr)
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bb_error_msg_and_die("missing optstring argument");
}
argv[n] = name ? name : argv[0];
return generate_output(argv + n, argc - n, optstr, long_options);
}