I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/*
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* Copyright (c) 2013, 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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* pwd.c
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* Prints the current working directory.
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*/
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#include <errno.h>
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#include <error.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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#include <unistd.h>
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static bool nul_or_slash(char c)
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{
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return !c || c == '/';
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}
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static bool next_elem_is_dot_or_dot_dot(const char* path)
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{
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return (path[0] == '.' && nul_or_slash(path[1])) ||
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(path[0] == '.' && path[1] == '.' && nul_or_slash(path[2]));
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}
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static bool is_path_absolute(const char* path)
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{
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size_t index = 0;
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if ( path[index++] != '/' )
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return false;
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while ( path[index] )
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{
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if ( next_elem_is_dot_or_dot_dot(path) )
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return false;
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while ( !nul_or_slash(path[index]) )
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index++;
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if ( path[index] == '/' )
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index++;
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}
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return true;
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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]...\n", argv0);
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fprintf(fp, "Print the full filename of the current working directory.\n");
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fprintf(fp, "\n");
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fprintf(fp, " -L, --logical use PWD from environment, even if it contains symlinks\n");
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fprintf(fp, " -P, --physical avoid all symlinks\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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}
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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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const char* argv0 = argv[0];
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bool physical = false;
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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 'L': physical = false; break;
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case 'P': physical = 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, "--logical") )
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physical = false;
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else if ( !strcmp(arg, "--physical") )
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physical = 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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// The get_current_dir_name function will use the PWD variable if it is
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// accurate, so we'll need to unset it if it is inappropriate to use it.
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const char* pwd_env;
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if ( (pwd_env = getenv("PWD")) )
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{
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if ( physical || !is_path_absolute(pwd_env) )
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unsetenv("PWD");
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}
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char* pwd = get_current_dir_name();
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if ( !pwd )
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error(1, errno, "get_current_dir_name");
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printf("%s\n", pwd);
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if ( ferror(stdout) || fflush(stdout) == EOF )
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error(1, errno, "stdout");
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return 0;
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}
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