130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/*
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* Copyright (c) 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* dirname.c
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* Strip last component from file name.
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*/
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#include <errno.h>
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#include <error.h>
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#include <libgen.h>
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#include <locale.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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void do_dirname(char* path, bool zero)
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{
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const char* name = dirname(path);
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fputs(name, stdout);
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fputc(zero ? '\0' : '\n', stdout);
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}
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static void compact_arguments(int* argc, char*** argv)
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{
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for ( int i = 0; i < *argc; i++ )
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{
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while ( i < *argc && !(*argv)[i] )
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{
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for ( int n = i; n < *argc; n++ )
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(*argv)[n] = (*argv)[n+1];
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(*argc)--;
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}
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}
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}
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static void help(FILE* fp, const char* argv0)
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{
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fprintf(fp, "Usage: %s [OPTION] NAME...\n", argv0);
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fprintf(fp, "Output each NAME with its last non-slash component and trailing slashes\n");
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fprintf(fp, "removed; if NAME contains no /'s, output '.' (meaning the current directory).\n");
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fprintf(fp, "\n");
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fprintf(fp, " -z, --zero separate output with NUL rather than newline\n");
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fprintf(fp, " --help display this help and exit\n");
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fprintf(fp, " --version output version information and exit\n");
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fprintf(fp, "\n");
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fprintf(fp, "Examples:\n");
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fprintf(fp, " %s /usr/bin/ -> \"/usr\"\n", argv0);
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fprintf(fp, " %s dir1/str dir2/str -> \"dir1\" followed by \"dir2\"\n", argv0);
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fprintf(fp, " %s stdio.h -> \".\"\n", argv0);
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}
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static void version(FILE* fp, const char* argv0)
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{
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fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
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}
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int main(int argc, char* argv[])
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{
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setlocale(LC_ALL, "");
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bool zero = false;
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const char* argv0 = argv[0];
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' || !arg[1] )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[1] != '-' )
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{
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char c;
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while ( (c = *++arg) ) switch ( c )
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{
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case 'z': zero = true; break;
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default:
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fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
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help(stderr, argv0);
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exit(1);
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}
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}
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else if ( !strcmp(arg, "--help") )
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help(stdout, argv0), exit(0);
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else if ( !strcmp(arg, "--version") )
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version(stdout, argv0), exit(0);
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else if ( !strcmp(arg, "--zero") )
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zero = true;
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else
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{
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fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
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help(stderr, argv0);
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exit(1);
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}
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}
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compact_arguments(&argc, &argv);
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if ( argc <= 1 )
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{
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error(0, 0, "missing operand");
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fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
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exit(1);
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}
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for ( int i = 1; i < argc; i++ )
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do_dirname(argv[i], zero);
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if ( fflush(stdout) == EOF )
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return 1;
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if ( ferror(stdout) )
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return 1;
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return 0;
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}
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