45 lines
783 B
C
45 lines
783 B
C
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#include <stdio.h>
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#include <stdlib.h>
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unsigned int nullline;
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int printvars(const int len, const 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%c", val, (nullline == 1) ? 0 : '\n');
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}
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return ret;
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}
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int main(const int argc, const char **argv, const char **envp) {
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int i;
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for (i = 1; i < argc; i++) {
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if (argv[i][0] != '-')
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break;
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else if (!strcmp(argv[i], "-0"))
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nullline = 1;
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else if (!strcmp(argv[i], "-h")) {
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printf("printenv [-n (end each output line with NUL, not newline)]\n");
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return 0;
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}
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}
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if (i == argc)
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while (*envp)
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printf("%s%c", *envp++, (nullline == 1) ? 0 : '\n');
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else
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return printvars(argc - i, argv + i);
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return 0;
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}
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