/* 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 tarball for details. */ /* * 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 Mi<B6>kiewicz * <misiek@misiek.eu.org>) * Ported to Busybox - Alfred M. Szmidt <ams@trillian.itslinux.org> * Removed --version/-V and --help/-h in * Removed parse_error(), using bb_error_msg() from Busybox instead * Replaced our_malloc with xmalloc and our_realloc with xrealloc * */ #include <getopt.h> #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_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_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) { char *bufptr; #if ENABLE_FEATURE_CLEAN_UP static char *BUFFER = NULL; free(BUFFER); #else char *BUFFER; #endif if (!quote) { /* Just copy arg */ BUFFER = xstrdup(arg); 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); bufptr = BUFFER; *bufptr ++= '\''; while (*arg) { if (*arg == '\'') { /* Quote: replace it with: '\'' */ *bufptr ++= '\''; *bufptr ++= '\\'; *bufptr ++= '\''; *bufptr ++= '\''; } else if (shell_TCSH && *arg == '!') { /* Exclamation mark: replace it with: \! */ *bufptr ++= '\''; *bufptr ++= '\\'; *bufptr ++= '!'; *bufptr ++= '\''; } else if (shell_TCSH && *arg == '\n') { /* Newline: replace it with: \n */ *bufptr ++= '\\'; *bufptr ++= 'n'; } else if (shell_TCSH && isspace(*arg)) { /* Non-newline whitespace: replace it with \<ws> */ *bufptr ++= '\''; *bufptr ++= '\\'; *bufptr ++= *arg; *bufptr ++= '\''; } else /* Just copy */ *bufptr ++= *arg; arg++; } *bufptr ++= '\''; *bufptr ++= '\0'; 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_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) { int exit_code = 0; /* We assume everything will be OK */ unsigned opt; #if ENABLE_GETOPT_LONG int longindex; #endif const char *charptr; if (quiet_errors) /* No error reporting from getopt(3) */ opterr = 0; optind = 0; /* Reset getopt(3) */ while (1) { opt = #if ENABLE_GETOPT_LONG alternative ? getopt_long_only(argc, argv, optstr, longopts, &longindex) : getopt_long(argc, argv, optstr, longopts, &longindex); #else getopt(argc, argv, optstr); #endif if (opt == EOF) break; if (opt == '?' || opt == ':' ) exit_code = 1; else if (!quiet_output) { #if ENABLE_GETOPT_LONG if (opt == LONG_OPT) { printf(" --%s", longopts[longindex].name); if (longopts[longindex].has_arg) printf(" %s", normalize(optarg ? optarg : "")); } else #endif if (opt == NON_OPT) printf(" %s", normalize(optarg)); else { printf(" -%c", opt); charptr = strchr(optstr,opt); if (charptr != NULL && *++charptr == ':') printf(" %s", normalize(optarg ? optarg : "")); } } } if (!quiet_output) { printf(" --"); while (optind < argc) printf(" %s", normalize(argv[optind++])); bb_putchar('\n'); } return exit_code; } #if ENABLE_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; int arg_opt, tlen; char *tokptr = strtok(options, ", \t\n"); if (long_options) while (long_options[long_nr].name) long_nr++; 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; } tokptr[tlen] = '\0'; if (tlen == 0) bb_error_msg_and_die("empty long option specified"); } long_options = xrealloc(long_options, sizeof(long_options[0]) * (long_nr+2)); long_options[long_nr].has_arg = arg_opt; long_options[long_nr].flag = NULL; 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])); } tokptr = strtok(NULL, ", \t\n"); } return long_options; } #endif static void set_shell(const char *new_shell) { if (!strcmp(new_shell,"bash") || !strcmp(new_shell,"sh")) return; if (!strcmp(new_shell,"tcsh") || !strcmp(new_shell,"csh")) option_mask32 |= SHELL_IS_TCSH; 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_GETOPT_LONG static const char getopt_longopts[] ALIGN1 = "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) { char *optstr = NULL; char *name = NULL; unsigned opt; const char *compatible; char *s_arg; #if ENABLE_GETOPT_LONG struct option *long_options = NULL; llist_t *l_arg = NULL; #endif compatible = getenv("GETOPT_COMPATIBLE"); /* used as yes/no flag */ if (argc == 1) { if (compatible) { /* For some reason, the original getopt gave no error when there were no arguments. */ printf(" --\n"); return 0; } bb_error_msg_and_die("missing optstring argument"); } if (argv[1][0] != '-' || compatible) { char *s; option_mask32 |= OPT_u; /* quoting off */ s = xstrdup(argv[1] + strspn(argv[1], "-+")); argv[1] = argv[0]; return generate_output(argv+1, argc-1, s, long_options); } #if !ENABLE_GETOPT_LONG opt = getopt32(argv, "+o:n:qQs:Tu", &optstr, &name, &s_arg); #else applet_long_options = getopt_longopts; opt_complementary = "l::"; opt = getopt32(argv, "+o:n:qQs:Tual:", &optstr, &name, &s_arg, &l_arg); /* Effectuate the read options for the applet itself */ while (l_arg) { long_options = add_long_options(long_options, l_arg->data); l_arg = l_arg->link; } #endif if (opt & OPT_s) { set_shell(s_arg); } if (opt & OPT_T) { return 4; } /* All options controlling the applet have now been parsed */ if (!optstr) { if (optind >= argc) bb_error_msg_and_die("missing optstring argument"); optstr = argv[optind++]; } argv[optind-1] = name ? name : argv[0]; return generate_output(argv+optind-1, argc-optind+1, optstr, long_options); }