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LibC/Shell: Add unsetenv(), and unset builtin calling it in Shell.
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3 changed files with 45 additions and 2 deletions
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@ -62,13 +62,40 @@ char* getenv(const char* name)
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return nullptr;
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}
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int unsetenv(char* name)
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{
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auto new_var_len = strlen(name);
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size_t environ_size = 0;
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size_t skip = -1;
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for (; environ[environ_size]; ++environ_size) {
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char* old_var = environ[environ_size];
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char* old_eq = strchr(old_var, '=');
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ASSERT(old_eq);
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auto old_var_len = old_eq - old_var;
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if (new_var_len != old_var_len)
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continue; // can't match
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if (strncmp(name, old_var, new_var_len) == 0)
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skip = environ_size;
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}
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if (skip == -1)
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return 0; // not found: no failure.
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// Shuffle the existing array down by one.
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memmove(&environ[skip], &environ[skip+1], ((environ_size-1)-skip) * sizeof(environ[0]));
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environ[environ_size-1] = nullptr;
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return 0;
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}
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int putenv(char* new_var)
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{
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char* new_eq = strchr(new_var, '=');
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// FIXME: should remove the var from the environment.
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if (!new_eq)
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return 0;
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return unsetenv(new_var);
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auto new_var_len = new_eq - new_var;
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size_t environ_size = 0;
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