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char* ExpandEnvVars (const char *psz)

Performs environment variable substitution.

Documentation

Replace environment variables ($SOMETHING) with their values. The format is $VARNAME or ${VARNAME} where VARNAME contains alphanumeric characters and '_' only. '$' must be escaped ('\$') in order to be taken literally.
Returns:
the resulting string, caller must 'delete []' it
Parameters:
pointer - to the string possibly contianing $VAR and/or ${VAR}

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