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Diffstat (limited to 'src/basename.c')
| -rw-r--r-- | src/basename.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/src/basename.c b/src/basename.c new file mode 100644 index 0000000..0e80bf9 --- /dev/null +++ b/src/basename.c @@ -0,0 +1,190 @@ +/* basename -- strip directory and suffix from file names + Copyright (C) 1990-2022 Free Software Foundation, Inc. + + 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 3 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, see <https://www.gnu.org/licenses/>. */ + +#include <config.h> +#include <getopt.h> +#include <stdio.h> +#include <sys/types.h> + +#include "system.h" +#include "error.h" +#include "quote.h" + +/* The official name of this program (e.g., no 'g' prefix). */ +#define PROGRAM_NAME "basename" + +#define AUTHORS proper_name ("David MacKenzie") + +static struct option const longopts[] = +{ + {"multiple", no_argument, NULL, 'a'}, + {"suffix", required_argument, NULL, 's'}, + {"zero", no_argument, NULL, 'z'}, + {GETOPT_HELP_OPTION_DECL}, + {GETOPT_VERSION_OPTION_DECL}, + {NULL, 0, NULL, 0} +}; + +void +usage (int status) +{ + if (status != EXIT_SUCCESS) + emit_try_help (); + else + { + printf (_("\ +Usage: %s NAME [SUFFIX]\n\ + or: %s OPTION... NAME...\n\ +"), + program_name, program_name); + fputs (_("\ +Print NAME with any leading directory components removed.\n\ +If specified, also remove a trailing SUFFIX.\n\ +"), stdout); + + emit_mandatory_arg_note (); + + fputs (_("\ + -a, --multiple support multiple arguments and treat each as a NAME\n\ + -s, --suffix=SUFFIX remove a trailing SUFFIX; implies -a\n\ + -z, --zero end each output line with NUL, not newline\n\ +"), stdout); + fputs (HELP_OPTION_DESCRIPTION, stdout); + fputs (VERSION_OPTION_DESCRIPTION, stdout); + printf (_("\ +\n\ +Examples:\n\ + %s /usr/bin/sort -> \"sort\"\n\ + %s include/stdio.h .h -> \"stdio\"\n\ + %s -s .h include/stdio.h -> \"stdio\"\n\ + %s -a any/str1 any/str2 -> \"str1\" followed by \"str2\"\n\ +"), + program_name, program_name, program_name, program_name); + emit_ancillary_info (PROGRAM_NAME); + } + exit (status); +} + +/* Remove SUFFIX from the end of NAME if it is there, unless NAME + consists entirely of SUFFIX. */ + +static void +remove_suffix (char *name, char const *suffix) +{ + char *np; + char const *sp; + + np = name + strlen (name); + sp = suffix + strlen (suffix); + + while (np > name && sp > suffix) + if (*--np != *--sp) + return; + if (np > name) + *np = '\0'; +} + +/* Perform the basename operation on STRING. If SUFFIX is non-NULL, remove + the trailing SUFFIX. Finally, output the result string. */ + +static void +perform_basename (char const *string, char const *suffix, bool use_nuls) +{ + char *name = base_name (string); + strip_trailing_slashes (name); + + /* Per POSIX, 'basename // /' must return '//' on platforms with + distinct //. On platforms with drive letters, this generalizes + to making 'basename c: :' return 'c:'. This rule is captured by + skipping suffix stripping if base_name returned an absolute path + or a drive letter (only possible if name is a file-system + root). */ + if (suffix && IS_RELATIVE_FILE_NAME (name) && ! FILE_SYSTEM_PREFIX_LEN (name)) + remove_suffix (name, suffix); + + fputs (name, stdout); + putchar (use_nuls ? '\0' : '\n'); + free (name); +} + +int +main (int argc, char **argv) +{ + bool multiple_names = false; + bool use_nuls = false; + char const *suffix = NULL; + + initialize_main (&argc, &argv); + set_program_name (argv[0]); + setlocale (LC_ALL, ""); + bindtextdomain (PACKAGE, LOCALEDIR); + textdomain (PACKAGE); + + atexit (close_stdout); + + while (true) + { + int c = getopt_long (argc, argv, "+as:z", longopts, NULL); + + if (c == -1) + break; + + switch (c) + { + case 's': + suffix = optarg; + /* -s implies -a, so... */ + FALLTHROUGH; + + case 'a': + multiple_names = true; + break; + + case 'z': + use_nuls = true; + break; + + case_GETOPT_HELP_CHAR; + case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS); + + default: + usage (EXIT_FAILURE); + } + } + + if (argc < optind + 1) + { + error (0, 0, _("missing operand")); + usage (EXIT_FAILURE); + } + + if (!multiple_names && optind + 2 < argc) + { + error (0, 0, _("extra operand %s"), quote (argv[optind + 2])); + usage (EXIT_FAILURE); + } + + if (multiple_names) + { + for (; optind < argc; optind++) + perform_basename (argv[optind], suffix, use_nuls); + } + else + perform_basename (argv[optind], + optind + 2 == argc ? argv[optind + 1] : NULL, use_nuls); + + return EXIT_SUCCESS; +} |