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.
206 lines
5.4 KiB
C
206 lines
5.4 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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* env.c
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* Set the environment for command invocation.
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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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void clean_environment(void)
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{
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while ( environ[0] )
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{
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size_t equal_pos = strcspn(environ[0], "=");
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if ( environ[0][equal_pos] != '=' )
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error(125, 0, "Bad Environment");
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char* key = strndup(environ[0], equal_pos);
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if ( !key )
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error(125, errno, "strndup");
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if ( unsetenv(key) != 0 )
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error(125, errno, "cannot unset `%s'", key);
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free(key);
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}
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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=VALUE]... [COMMAND [ARG]...]\n", argv0);
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fprintf(fp, "Set each NAME to VALUE in the environment and run COMMAND.\n");
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fprintf(fp, "\n");
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fprintf(fp, " -i, --ignore-environment start with an empty environment\n");
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fprintf(fp, " -0, --null end each output line with 0 byte rather than newline\n");
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fprintf(fp, " -u, --unset=NAME remove variable from the environment\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, "A mere - implies -i. If no COMMAND, print the resulting environment.\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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bool ignore_environment = false;
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bool null_terminate = 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] != '-' )
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break; // Intentionally not continue.
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if ( arg[0] == '-' && !arg[1] )
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{
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ignore_environment = true;
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break;
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}
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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 'i': ignore_environment = true; break;
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case 'u':
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if ( !arg[1] )
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{
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if ( i + 1 == argc )
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{
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error(0, 0, "option requires an argument -- 'u'");
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fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
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exit(125);
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}
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const char* key = argv[i+1];
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argv[++i] = NULL;
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if ( unsetenv(key) != 0 )
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error(125, errno, "cannot unset `%s'", key);
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}
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else
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{
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const char* key = arg + 1;
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if ( unsetenv(key) != 0 )
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error(125, errno, "cannot unset `%s'", key);
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}
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arg = "u";
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break;
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case '0': null_terminate = 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, "--ignore-environment") )
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ignore_environment = true;
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else if ( !strcmp(arg, "--null") )
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null_terminate = true;
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else if ( !strncmp(arg, "--unset=", strlen("--unset=")) )
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{
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const char* key = arg + strlen("--unset=");
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if ( unsetenv(key) != 0 )
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error(125, errno, "cannot unset `%s'", key);
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}
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else if ( !strcmp(arg, "--unset") )
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{
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if ( i + 1 == argc )
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{
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error(0, 0, "option '--unset' requires an argument");
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fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
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exit(125);
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}
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const char* key = argv[i+1];
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argv[++i] = NULL;
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if ( unsetenv(key) != 0 )
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error(125, errno, "cannot unset `%s'", key);
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}
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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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if ( ignore_environment )
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clean_environment();
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compact_arguments(&argc, &argv);
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for ( int i = 1; i < argc; i++ )
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{
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char* arg = argv[i];
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size_t equal_pos = strcspn(arg, "=");
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if ( arg[equal_pos] != '=' )
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break;
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argv[i] = NULL;
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arg[equal_pos] = '\0';
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const char* key = arg;
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const char* value = arg + equal_pos + 1;
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if ( setenv(key, value, 1) != 0 )
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error(125, errno, "setenv(\"%s\", \"%s\")", key, value);
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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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for ( size_t i = 0; environ[i]; i++ )
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{
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fputs(environ[i], stdout);
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fputc(null_terminate ? '\0' : '\n', stdout);
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}
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return 0;
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}
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if ( null_terminate )
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{
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error(0, 0, "cannot specify --null (-0) with command");
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fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
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exit(125);
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}
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execvp(argv[1], argv + 1);
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error(errno == ENOENT ? 127 : 126, errno, "%s", argv[1]);
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}
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