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Diffstat (limited to 'src/dircolors.c')
| -rw-r--r-- | src/dircolors.c | 512 |
1 files changed, 512 insertions, 0 deletions
diff --git a/src/dircolors.c b/src/dircolors.c new file mode 100644 index 0000000..82eb1e0 --- /dev/null +++ b/src/dircolors.c @@ -0,0 +1,512 @@ +/* dircolors - output commands to set the LS_COLOR environment variable + Copyright (C) 1996-2007 Free Software Foundation, Inc. + Copyright (C) 1994, 1995, 1997, 1998, 1999, 2000 H. Peter Anvin + + 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, 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. */ + +#include <config.h> + +#include <sys/types.h> +#include <getopt.h> +#include <stdio.h> + +#include "system.h" +#include "dircolors.h" +#include "c-strcase.h" +#include "error.h" +#include "getline.h" +#include "obstack.h" +#include "quote.h" +#include "xstrndup.h" + +/* The official name of this program (e.g., no `g' prefix). */ +#define PROGRAM_NAME "dircolors" + +#define AUTHORS "H. Peter Anvin" + +#define obstack_chunk_alloc malloc +#define obstack_chunk_free free + +enum Shell_syntax +{ + SHELL_SYNTAX_BOURNE, + SHELL_SYNTAX_C, + SHELL_SYNTAX_UNKNOWN +}; + +#define APPEND_CHAR(C) obstack_1grow (&lsc_obstack, C) +#define APPEND_TWO_CHAR_STRING(S) \ + do \ + { \ + APPEND_CHAR (S[0]); \ + APPEND_CHAR (S[1]); \ + } \ + while (0) + +/* Accumulate in this obstack the value for the LS_COLORS environment + variable. */ +static struct obstack lsc_obstack; + +static const char *const slack_codes[] = +{ + "NORMAL", "NORM", "FILE", "DIR", "LNK", "LINK", + "SYMLINK", "ORPHAN", "MISSING", "FIFO", "PIPE", "SOCK", "BLK", "BLOCK", + "CHR", "CHAR", "DOOR", "EXEC", "LEFT", "LEFTCODE", "RIGHT", "RIGHTCODE", + "END", "ENDCODE", "SUID", "SETUID", "SGID", "SETGID", "STICKY", + "OTHER_WRITABLE", "OWR", "STICKY_OTHER_WRITABLE", "OWT", NULL +}; + +static const char *const ls_codes[] = +{ + "no", "no", "fi", "di", "ln", "ln", "ln", "or", "mi", "pi", "pi", + "so", "bd", "bd", "cd", "cd", "do", "ex", "lc", "lc", "rc", "rc", "ec", "ec", + "su", "su", "sg", "sg", "st", "ow", "ow", "tw", "tw", NULL +}; +#define array_len(Array) (sizeof (Array) / sizeof *(Array)) +verify (array_len (slack_codes) == array_len (ls_codes)); + +static struct option const long_options[] = + { + {"bourne-shell", no_argument, NULL, 'b'}, + {"sh", no_argument, NULL, 'b'}, + {"csh", no_argument, NULL, 'c'}, + {"c-shell", no_argument, NULL, 'c'}, + {"print-database", no_argument, NULL, 'p'}, + {GETOPT_HELP_OPTION_DECL}, + {GETOPT_VERSION_OPTION_DECL}, + {NULL, 0, NULL, 0} + }; + +char *program_name; + +void +usage (int status) +{ + if (status != EXIT_SUCCESS) + fprintf (stderr, _("Try `%s --help' for more information.\n"), + program_name); + else + { + printf (_("Usage: %s [OPTION]... [FILE]\n"), program_name); + fputs (_("\ +Output commands to set the LS_COLORS environment variable.\n\ +\n\ +Determine format of output:\n\ + -b, --sh, --bourne-shell output Bourne shell code to set LS_COLORS\n\ + -c, --csh, --c-shell output C shell code to set LS_COLORS\n\ + -p, --print-database output defaults\n\ +"), stdout); + fputs (HELP_OPTION_DESCRIPTION, stdout); + fputs (VERSION_OPTION_DESCRIPTION, stdout); + fputs (_("\ +\n\ +If FILE is specified, read it to determine which colors to use for which\n\ +file types and extensions. Otherwise, a precompiled database is used.\n\ +For details on the format of these files, run `dircolors --print-database'.\n\ +"), stdout); + printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT); + } + + exit (status); +} + +/* If the SHELL environment variable is set to `csh' or `tcsh,' + assume C shell. Else Bourne shell. */ + +static enum Shell_syntax +guess_shell_syntax (void) +{ + char *shell; + + shell = getenv ("SHELL"); + if (shell == NULL || *shell == '\0') + return SHELL_SYNTAX_UNKNOWN; + + shell = last_component (shell); + + if (STREQ (shell, "csh") || STREQ (shell, "tcsh")) + return SHELL_SYNTAX_C; + + return SHELL_SYNTAX_BOURNE; +} + +static void +parse_line (char const *line, char **keyword, char **arg) +{ + char const *p; + char const *keyword_start; + char const *arg_start; + + *keyword = NULL; + *arg = NULL; + + for (p = line; isspace (to_uchar (*p)); ++p) + continue; + + /* Ignore blank lines and shell-style comments. */ + if (*p == '\0' || *p == '#') + return; + + keyword_start = p; + + while (!isspace (to_uchar (*p)) && *p != '\0') + { + ++p; + } + + *keyword = xstrndup (keyword_start, p - keyword_start); + if (*p == '\0') + return; + + do + { + ++p; + } + while (isspace (to_uchar (*p))); + + if (*p == '\0' || *p == '#') + return; + + arg_start = p; + + while (*p != '\0' && *p != '#') + ++p; + + for (--p; isspace (to_uchar (*p)); --p) + continue; + ++p; + + *arg = xstrndup (arg_start, p - arg_start); +} + +/* FIXME: Write a string to standard out, while watching for "dangerous" + sequences like unescaped : and = characters. */ + +static void +append_quoted (const char *str) +{ + bool need_backslash = true; + + while (*str != '\0') + { + switch (*str) + { + case '\'': + APPEND_CHAR ('\''); + APPEND_CHAR ('\\'); + APPEND_CHAR ('\''); + need_backslash = true; + break; + + case '\\': + case '^': + need_backslash = !need_backslash; + break; + + case ':': + case '=': + if (need_backslash) + APPEND_CHAR ('\\'); + /* Fall through */ + + default: + need_backslash = true; + break; + } + + APPEND_CHAR (*str); + ++str; + } +} + +/* Read the file open on FP (with name FILENAME). First, look for a + `TERM name' directive where name matches the current terminal type. + Once found, translate and accumulate the associated directives onto + the global obstack LSC_OBSTACK. Give a diagnostic + upon failure (unrecognized keyword is the only way to fail here). + Return true if successful. */ + +static bool +dc_parse_stream (FILE *fp, const char *filename) +{ + size_t line_number = 0; + char const *next_G_line = G_line; + char *input_line = NULL; + size_t input_line_size = 0; + char const *line; + char const *term; + bool ok = true; + + /* State for the parser. */ + enum { ST_TERMNO, ST_TERMYES, ST_TERMSURE, ST_GLOBAL } state = ST_GLOBAL; + + /* Get terminal type */ + term = getenv ("TERM"); + if (term == NULL || *term == '\0') + term = "none"; + + while (1) + { + char *keywd, *arg; + bool unrecognized; + + ++line_number; + + if (fp) + { + if (getline (&input_line, &input_line_size, fp) <= 0) + { + free (input_line); + break; + } + line = input_line; + } + else + { + if (next_G_line == G_line + sizeof G_line) + break; + line = next_G_line; + next_G_line += strlen (next_G_line) + 1; + } + + parse_line (line, &keywd, &arg); + + if (keywd == NULL) + continue; + + if (arg == NULL) + { + error (0, 0, _("%s:%lu: invalid line; missing second token"), + filename, (unsigned long int) line_number); + ok = false; + free (keywd); + continue; + } + + unrecognized = false; + if (c_strcasecmp (keywd, "TERM") == 0) + { + if (STREQ (arg, term)) + state = ST_TERMSURE; + else if (state != ST_TERMSURE) + state = ST_TERMNO; + } + else + { + if (state == ST_TERMSURE) + state = ST_TERMYES; /* Another TERM can cancel */ + + if (state != ST_TERMNO) + { + if (keywd[0] == '.') + { + APPEND_CHAR ('*'); + append_quoted (keywd); + APPEND_CHAR ('='); + append_quoted (arg); + APPEND_CHAR (':'); + } + else if (keywd[0] == '*') + { + append_quoted (keywd); + APPEND_CHAR ('='); + append_quoted (arg); + APPEND_CHAR (':'); + } + else if (c_strcasecmp (keywd, "OPTIONS") == 0 + || c_strcasecmp (keywd, "COLOR") == 0 + || c_strcasecmp (keywd, "EIGHTBIT") == 0) + { + /* Ignore. */ + } + else + { + int i; + + for (i = 0; slack_codes[i] != NULL; ++i) + if (c_strcasecmp (keywd, slack_codes[i]) == 0) + break; + + if (slack_codes[i] != NULL) + { + APPEND_TWO_CHAR_STRING (ls_codes[i]); + APPEND_CHAR ('='); + append_quoted (arg); + APPEND_CHAR (':'); + } + else + { + unrecognized = true; + } + } + } + else + { + unrecognized = true; + } + } + + if (unrecognized && (state == ST_TERMSURE || state == ST_TERMYES)) + { + error (0, 0, _("%s:%lu: unrecognized keyword %s"), + (filename ? quote (filename) : _("<internal>")), + (unsigned long int) line_number, keywd); + ok = false; + } + + free (keywd); + free (arg); + } + + return ok; +} + +static bool +dc_parse_file (const char *filename) +{ + bool ok; + + if (! STREQ (filename, "-") && freopen (filename, "r", stdin) == NULL) + { + error (0, errno, "%s", filename); + return false; + } + + ok = dc_parse_stream (stdin, filename); + + if (fclose (stdin) != 0) + { + error (0, errno, "%s", quote (filename)); + return false; + } + + return ok; +} + +int +main (int argc, char **argv) +{ + bool ok = true; + int optc; + enum Shell_syntax syntax = SHELL_SYNTAX_UNKNOWN; + bool print_database = false; + + initialize_main (&argc, &argv); + program_name = argv[0]; + setlocale (LC_ALL, ""); + bindtextdomain (PACKAGE, LOCALEDIR); + textdomain (PACKAGE); + + atexit (close_stdout); + + while ((optc = getopt_long (argc, argv, "bcp", long_options, NULL)) != -1) + switch (optc) + { + case 'b': /* Bourne shell syntax. */ + syntax = SHELL_SYNTAX_BOURNE; + break; + + case 'c': /* C shell syntax. */ + syntax = SHELL_SYNTAX_C; + break; + + case 'p': + print_database = true; + break; + + case_GETOPT_HELP_CHAR; + + case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS); + + default: + usage (EXIT_FAILURE); + } + + argc -= optind; + argv += optind; + + /* It doesn't make sense to use --print with either of + --bourne or --c-shell. */ + if (print_database && syntax != SHELL_SYNTAX_UNKNOWN) + { + error (0, 0, + _("the options to output dircolors' internal database and\n\ +to select a shell syntax are mutually exclusive")); + usage (EXIT_FAILURE); + } + + if (!print_database < argc) + { + error (0, 0, _("extra operand %s"), quote (argv[!print_database])); + if (print_database) + fprintf (stderr, "%s\n", + _("File operands cannot be combined with " + "--print-database (-p).")); + usage (EXIT_FAILURE); + } + + if (print_database) + { + char const *p = G_line; + while (p < G_line + sizeof G_line) + { + puts (p); + p += strlen (p) + 1; + } + } + else + { + /* If shell syntax was not explicitly specified, try to guess it. */ + if (syntax == SHELL_SYNTAX_UNKNOWN) + { + syntax = guess_shell_syntax (); + if (syntax == SHELL_SYNTAX_UNKNOWN) + { + error (EXIT_FAILURE, 0, + _("no SHELL environment variable, and no shell type option given")); + } + } + + obstack_init (&lsc_obstack); + if (argc == 0) + ok = dc_parse_stream (NULL, NULL); + else + ok = dc_parse_file (argv[0]); + + if (ok) + { + size_t len = obstack_object_size (&lsc_obstack); + char *s = obstack_finish (&lsc_obstack); + const char *prefix; + const char *suffix; + + if (syntax == SHELL_SYNTAX_BOURNE) + { + prefix = "LS_COLORS='"; + suffix = "';\nexport LS_COLORS\n"; + } + else + { + prefix = "setenv LS_COLORS '"; + suffix = "'\n"; + } + fputs (prefix, stdout); + fwrite (s, 1, len, stdout); + fputs (suffix, stdout); + } + } + + exit (ok ? EXIT_SUCCESS : EXIT_FAILURE); +} |