diff options
Diffstat (limited to 'misc-utils/getopt.c')
| -rw-r--r-- | misc-utils/getopt.c | 472 |
1 files changed, 472 insertions, 0 deletions
diff --git a/misc-utils/getopt.c b/misc-utils/getopt.c new file mode 100644 index 0000000..9b4f352 --- /dev/null +++ b/misc-utils/getopt.c @@ -0,0 +1,472 @@ +/* + * getopt.c - Enhanced implementation of BSD getopt(1) + * Copyright (c) 1997-2014 Frodo Looijaard <frodo@frodo.looijaard.name> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +/* + * 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 Miśkiewicz + * <misiek@pld.org.pl>) + * Version 1.1.4: Mon Nov 7 2005 + * Fixed a few type's in the manpage + * Version 1.1.5: Sun Aug 12 2012 + * Sync with util-linux-2.21, fixed build problems, many new translations + * Version 1.1.6: Mon Nov 24 2014 + * Sync with util-linux git 20141120, detect ambiguous long options, fix + * backslash problem in tcsh + */ + +/* 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 + */ +#define GETOPT_EXIT_CODE 1 +#define PARAMETER_EXIT_CODE 2 +#define XALLOC_EXIT_CODE 3 +#define CLOSE_EXIT_CODE XALLOC_EXIT_CODE +#define TEST_EXIT_CODE 4 + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <ctype.h> +#include <getopt.h> +#ifdef HAVE_SYS_PARAM_H +# include <sys/param.h> /* BSD */ +#endif + +#include "closestream.h" +#include "nls.h" +#include "xalloc.h" + +/* NON_OPT is the code that is returned getopt(3) when a non-option is + * found in 'char optstring[]="-abc...";', e.g., it begins by '-' */ +#define NON_OPT 1 +/* LONG_OPT is the code that is returned when a long option is found. */ +#define LONG_OPT 0 + +/* The shells recognized. */ +typedef enum { BASH, TCSH } shell_t; + +struct getopt_control { + shell_t shell; /* the shell we generate output for */ + char *optstr; /* getopt(3) optstring */ + char *name; + struct option *long_options; /* long options */ + int long_options_length; /* length of options array */ + int long_options_nr; /* number of used elements in array */ + unsigned int + compatible:1, /* compatibility mode for 'difficult' programs */ + quiet_errors:1, /* print errors */ + quiet_output:1, /* print output */ + quote:1; /* quote output */ +}; + +enum { REALLOC_INCREMENT = 8 }; + +/* Allow changing which getopt is in use with function pointer. */ +static int (*getopt_long_fp) (int argc, char *const *argv, const char *optstr, + const struct option * longopts, int *longindex); + +/* + * 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 void print_normalized(const struct getopt_control *ctl, const char *arg) +{ + char *buf; + const char *argptr = arg; + char *bufptr; + + if (!ctl->quote) { + printf(" %s", arg); + return; + } + + /* + * 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'. + */ + buf = xmalloc(strlen(arg) * 4 + 3); + bufptr = buf; + + for (*bufptr++ = '\''; *argptr; argptr++) { + if (ctl->shell == TCSH) { + switch (*argptr) { + case '\\': + /* Backslash: replace it with: '\\' */ + *bufptr++ = '\\'; + *bufptr++ = '\\'; + continue; + case '!': + /* Exclamation mark: replace it with: \! */ + *bufptr++ = '\''; + *bufptr++ = '\\'; + *bufptr++ = '!'; + *bufptr++ = '\''; + continue; + case '\n': + /* Newline: replace it with: \n */ + *bufptr++ = '\\'; + *bufptr++ = 'n'; + continue; + } + if (isspace(*argptr)) { + /* Non-newline whitespace: replace it with \<ws> */ + *bufptr++ = '\''; + *bufptr++ = '\\'; + *bufptr++ = *argptr; + *bufptr++ = '\''; + continue; + } + } + if (*argptr == '\'') { + /* Quote: replace it with: '\'' */ + *bufptr++ = '\''; + *bufptr++ = '\\'; + *bufptr++ = '\''; + *bufptr++ = '\''; + } else + /* Just copy */ + *bufptr++ = *argptr; + } + + *bufptr++ = '\''; + *bufptr++ = '\0'; + printf(" %s", buf); + free(buf); +} + +/* + * 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. + */ +static int generate_output(struct getopt_control *ctl, char *argv[], int argc) +{ + int exit_code = EXIT_SUCCESS; /* Assume everything will be OK */ + int opt; + int longindex; + const char *charptr; + + if (ctl->quiet_errors) + /* No error reporting from getopt(3) */ + opterr = 0; + /* Reset getopt(3) */ + optind = 0; + + while ((opt = + (getopt_long_fp + (argc, argv, ctl->optstr, + (const struct option *)ctl->long_options, &longindex))) + != EOF) { + if (opt == '?' || opt == ':') + exit_code = GETOPT_EXIT_CODE; + else if (!ctl->quiet_output) { + switch (opt) { + case LONG_OPT: + printf(" --%s", ctl->long_options[longindex].name); + if (ctl->long_options[longindex].has_arg) + print_normalized(ctl, optarg ? optarg : ""); + break; + case NON_OPT: + print_normalized(ctl, optarg ? optarg : ""); + break; + default: + printf(" -%c", opt); + charptr = strchr(ctl->optstr, opt); + if (charptr != NULL && *++charptr == ':') + print_normalized(ctl, optarg ? optarg : ""); + } + } + } + if (!ctl->quiet_output) { + printf(" --"); + while (optind < argc) + print_normalized(ctl, argv[optind++]); + printf("\n"); + } + for (longindex = 0; longindex < ctl->long_options_nr; longindex++) + free((char *)ctl->long_options[longindex].name); + free(ctl->long_options); + free(ctl->optstr); + free(ctl->name); + return exit_code; +} + +/* + * Report an error when parsing getopt's own arguments. If message is NULL, + * we already sent a message, we just exit with a helpful hint. + */ +static void __attribute__ ((__noreturn__)) parse_error(const char *message) +{ + if (message) + warnx("%s", message); + errtryhelp(PARAMETER_EXIT_CODE); +} + + +/* Register a long option. The contents of name is copied. */ +static void add_longopt(struct getopt_control *ctl, const char *name, int has_arg) +{ + static int flag; + int nr = ctl->long_options_nr; + + if (ctl->long_options_nr == ctl->long_options_length) { + ctl->long_options_length += REALLOC_INCREMENT; + ctl->long_options = xrealloc(ctl->long_options, + sizeof(struct option) * + ctl->long_options_length); + } + if (name) { + /* Not for init! */ + ctl->long_options[nr].has_arg = has_arg; + ctl->long_options[nr].flag = &flag; + ctl->long_options[nr].val = ctl->long_options_nr; + ctl->long_options[nr].name = xstrdup(name); + } else { + /* lets use add_longopt(ct, NULL, 0) to terminate the array */ + ctl->long_options[nr].name = NULL; + ctl->long_options[nr].has_arg = 0; + ctl->long_options[nr].flag = NULL; + ctl->long_options[nr].val = 0; + } +} + + +/* + * Register several long options. options is a string of long options, + * separated by commas or whitespace. This nukes options! + */ +static void add_long_options(struct getopt_control *ctl, char *options) +{ + int arg_opt; + char *tokptr = strtok(options, ", \t\n"); + + while (tokptr) { + size_t len = strlen(tokptr); + + arg_opt = no_argument; + if (len > 0) { + if (tokptr[len - 1] == ':') { + if (tokptr[len - 2] == ':') { + tokptr[len - 2] = '\0'; + arg_opt = optional_argument; + } else { + tokptr[len - 1] = '\0'; + arg_opt = required_argument; + } + if (!*tokptr) + parse_error(_ + ("empty long option after " + "-l or --long argument")); + } + add_longopt(ctl, tokptr, arg_opt); + ctl->long_options_nr++; + } + tokptr = strtok(NULL, ", \t\n"); + } + add_longopt(ctl, NULL, 0); /* ensure long_options[] is not full */ +} + +static shell_t shell_type(const char *new_shell) +{ + if (!strcmp(new_shell, "bash")) + return BASH; + if (!strcmp(new_shell, "sh")) + return BASH; + if (!strcmp(new_shell, "tcsh")) + return TCSH; + if (!strcmp(new_shell, "csh")) + return TCSH; + parse_error(_("unknown shell after -s or --shell argument")); +} + +static void __attribute__((__noreturn__)) usage(void) +{ + fputs(USAGE_HEADER, stdout); + printf(_( + " %1$s <optstring> <parameters>\n" + " %1$s [options] [--] <optstring> <parameters>\n" + " %1$s [options] -o|--options <optstring> [options] [--] <parameters>\n"), + program_invocation_short_name); + + fputs(USAGE_SEPARATOR, stdout); + fputs(_("Parse command options.\n"), stdout); + + fputs(USAGE_OPTIONS, stdout); + fputs(_(" -a, --alternative allow long options starting with single -\n"), stdout); + fputs(_(" -l, --longoptions <longopts> the long options to be recognized\n"), stdout); + fputs(_(" -n, --name <progname> the name under which errors are reported\n"), stdout); + fputs(_(" -o, --options <optstring> the short options to be recognized\n"), stdout); + fputs(_(" -q, --quiet disable error reporting by getopt(3)\n"), stdout); + fputs(_(" -Q, --quiet-output no normal output\n"), stdout); + fputs(_(" -s, --shell <shell> set quoting conventions to those of <shell>\n"), stdout); + fputs(_(" -T, --test test for getopt(1) version\n"), stdout); + fputs(_(" -u, --unquoted do not quote the output\n"), stdout); + fputs(USAGE_SEPARATOR, stdout); + printf(USAGE_HELP_OPTIONS(31)); + printf(USAGE_MAN_TAIL("getopt(1)")); + exit(EXIT_SUCCESS); +} + +int main(int argc, char *argv[]) +{ + struct getopt_control ctl = { + .shell = BASH, + .quote = 1 + }; + int opt; + + /* Stop scanning as soon as a non-option argument is found! */ + static const char *shortopts = "+ao:l:n:qQs:TuhV"; + static const struct option longopts[] = { + {"options", required_argument, NULL, 'o'}, + {"longoptions", required_argument, NULL, 'l'}, + {"quiet", no_argument, NULL, 'q'}, + {"quiet-output", no_argument, NULL, 'Q'}, + {"shell", required_argument, NULL, 's'}, + {"test", no_argument, NULL, 'T'}, + {"unquoted", no_argument, NULL, 'u'}, + {"help", no_argument, NULL, 'h'}, + {"alternative", no_argument, NULL, 'a'}, + {"name", required_argument, NULL, 'n'}, + {"version", no_argument, NULL, 'V'}, + {NULL, 0, NULL, 0} + }; + + setlocale(LC_ALL, ""); + bindtextdomain(PACKAGE, LOCALEDIR); + textdomain(PACKAGE); + atexit(close_stdout); + + if (getenv("GETOPT_COMPATIBLE")) + ctl.compatible = 1; + + if (argc == 1) { + if (ctl.compatible) { + /* + * For some reason, the original getopt gave no + * error when there were no arguments. + */ + printf(" --\n"); + return EXIT_SUCCESS; + } else + parse_error(_("missing optstring argument")); + } + + add_longopt(&ctl, NULL, 0); /* init */ + getopt_long_fp = getopt_long; + + if (argv[1][0] != '-' || ctl.compatible) { + ctl.quote = 0; + ctl.optstr = xmalloc(strlen(argv[1]) + 1); + strcpy(ctl.optstr, argv[1] + strspn(argv[1], "-+")); + argv[1] = argv[0]; + return generate_output(&ctl, argv + 1, argc - 1); + } + + while ((opt = + getopt_long(argc, argv, shortopts, longopts, NULL)) != EOF) + switch (opt) { + case 'a': + getopt_long_fp = getopt_long_only; + break; + case 'h': + usage(); + case 'o': + free(ctl.optstr); + ctl.optstr = xstrdup(optarg); + break; + case 'l': + add_long_options(&ctl, optarg); + break; + case 'n': + free(ctl.name); + ctl.name = xstrdup(optarg); + break; + case 'q': + ctl.quiet_errors = 1; + break; + case 'Q': + ctl.quiet_output = 1; + break; + case 's': + ctl.shell = shell_type(optarg); + break; + case 'T': + free(ctl.long_options); + return TEST_EXIT_CODE; + case 'u': + ctl.quote = 0; + break; + case 'V': + printf(UTIL_LINUX_VERSION); + return EXIT_SUCCESS; + case '?': + case ':': + parse_error(NULL); + default: + parse_error(_("internal error, contact the author.")); + } + + if (!ctl.optstr) { + if (optind >= argc) + parse_error(_("missing optstring argument")); + else { + ctl.optstr = xstrdup(argv[optind]); + optind++; + } + } + + if (ctl.name) { + argv[optind - 1] = ctl.name; +#if defined (HAVE_SETPROGNAME) && !defined (__linux__) + setprogname(ctl.name); +#endif + } else + argv[optind - 1] = argv[0]; + + return generate_output(&ctl, argv + optind - 1, argc - optind + 1); +} |