47 lines
738 B
C
47 lines
738 B
C
/* printenv -- minimal clone of BSD printenv(1).
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usage: printenv [varname]
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Chet Ramey
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chet@po.cwru.edu
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*/
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extern char **environ;
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int
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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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register char **envp, *eval;
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int len;
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argv++;
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argc--;
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/* printenv */
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if (argc == 0)
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{
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for (envp = environ; *envp; envp++)
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puts (*envp);
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exit (0);
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}
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/* printenv varname */
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len = strlen (*argv);
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for (envp = environ; *envp; envp++)
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{
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if (**argv == **envp && strncmp (*envp, *argv, len) == 0)
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{
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eval = *envp + len;
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/* If the environment variable doesn't have an `=', ignore it. */
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if (*eval == '=')
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{
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puts (eval + 1);
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exit (0);
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}
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}
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}
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exit (1);
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}
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