110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/*
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* Copyright (c) 1988 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that: (1) source distributions retain this entire copyright
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* notice and comment, and (2) distributions including binaries display
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* the following acknowledgement: ``This product includes software
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* developed by the University of California, Berkeley and its contributors''
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* in the documentation or other materials provided with the distribution
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* and in all advertising materials mentioning features or use of this
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* software. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1988 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)env.c 5.3 (Berkeley) 6/1/90";
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#endif /* not lint */
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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main(argc, argv)
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int argc;
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char **argv;
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{
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extern char **environ;
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extern int errno, optind;
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register char **ep, *p;
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register char *cp;
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char *cleanenv[1];
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int ch;
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if ((cp = strrchr(argv[0], '/')) != NULL)
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cp++;
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else
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cp = argv[0];
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/* if "printenv" then do this */
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if (!strcmp(cp, "printenv")) {
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register char **ep;
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register int len;
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/* if printenv with no args then print all environment variables */
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if (argc < 2) {
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for (ep = environ; *ep; ep++)
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(void) printf("%s\n",*ep);
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exit(0);
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}
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/* Given arg. print out the value of the envronment variable */
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len = strlen(*++argv);
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for (ep = environ; *ep; ep++)
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if (!strncmp(*ep, *argv, len)) {
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cp = *ep + len;
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if (!*cp || *cp == '=') {
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(void) printf("%s\n",*cp ? cp + 1 : cp);
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exit(0);
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}
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}
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exit(1);
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}
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argv++;
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argc--;
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if(argc && (strcmp(*argv, "-i") == 0 || strcmp(*argv, "-") == 0)){
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environ = cleanenv;
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cleanenv[0] = NULL;
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argv++;
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argc--;
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}
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if(argc && strcmp(*argv, "--") == 0){
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argv++;
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argc--;
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}
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if (argc && strcmp(*argv,"-?") == 0) {
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(void)fprintf(stderr, "usage: env [-] [name=value ...] [command]\n");
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exit(1);
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}
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for (; (*argv != NULL) && (p = strchr(*argv, '=')); ++argv)
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(void)putenv(*argv);
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if (*argv) {
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execvp(*argv, argv);
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(void)fprintf(stderr, "env: %s: %s\n", *argv,
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strerror(errno));
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if(errno == ENOENT) exit(127);
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if(errno == EACCES) exit(126);
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}
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for (ep = environ; *ep; ep++)
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(void)printf("%s\n", *ep);
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exit(0);
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}
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