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@@ -3,19 +3,46 @@
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2013-2018 K. Lange
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*
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- * env - Print environment
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- *
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- * Prints all the environment values.
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+ * env - Print or set environment
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*/
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#include <stdio.h>
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+#include <stdlib.h>
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#include <unistd.h>
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+#include <string.h>
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+#include <errno.h>
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+
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+extern int _environ_size;
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int main(int argc, char ** argv) {
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- char ** env = environ;
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+ int start = 1;
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+
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+ if (start < argc && !strcmp(argv[start],"-i")) {
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+ for (int i = 0; i < _environ_size; ++i) {
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+ environ[i] = NULL;
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+ }
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+ start++;
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+ }
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+
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+ for (; start < argc; ++start) {
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+ if (!strchr(argv[start],'=')) {
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+ break;
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+ } else {
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+ putenv(argv[start]);
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+ }
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+ }
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+
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+ if (start < argc) {
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+ /* Execute command */
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+ if (execvp(argv[start], &argv[start])) {
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+ fprintf(stderr, "%s: %s: %s\n", argv[0], argv[start], strerror(errno));
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+ }
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+ } else {
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+ char ** env = environ;
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- while (*env) {
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- printf("%s\n", *env);
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- env++;
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+ while (*env) {
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+ printf("%s\n", *env);
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+ env++;
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+ }
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}
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return 0;
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