esp-idf/tools/kconfig/expand_env.h

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#pragma once
/* Expand any $ENV type environment variables in 'input',
return a newly allocated buffer with the result.
Buffer should be freed after use.
This is very basic expansion, doesn't do escaping or anything else.
*/
char *expand_environment(const char *input, const char *src_name, int src_line_no);
/* Free a buffer allocated by expand_environment */
void free_expanded(char *expanded);