41 lines
601 B
C
41 lines
601 B
C
#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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int printvars(int len, char **names) {
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int ret = 0;
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for (int i = 0; i < len; i++) {
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char *val = getenv(names[i]);
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if (!val) {
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ret = 1;
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continue;
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}
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printf("%s\n", val);
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}
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return ret;
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}
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int main(int argc, char **argv, const char **envp) {
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int opt;
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while ((opt = getopt(argc, argv, "0")) != -1) {
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printf("printenv [var1 var2...]\n");
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return 0;
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}
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argv += optind;
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argc -= optind;
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if (argc == 0)
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while (*envp)
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printf("%s\n", *envp++);
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else
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return printvars(argc, argv);
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return 0;
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}
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