[settings] Add fetchf_named_setting_copy()
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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@ -1332,6 +1332,45 @@ int fetchf_named_setting ( const char *name,
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return len;
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return len;
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}
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}
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/**
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* Fetch and format copy of value of named setting
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*
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* @v name Name of setting
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* @v data Buffer to allocate and fill with formatted value
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* @ret len Length of formatted value, or negative error
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*
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* The caller is responsible for eventually freeing the allocated
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* buffer.
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*
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* To allow the caller to distinguish between a non-existent setting
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* and an error in allocating memory for the copy, this function will
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* return success (and a NULL buffer pointer) for a non-existent
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* setting.
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*/
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int fetchf_named_setting_copy ( const char *name, char **data ) {
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int len;
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int check_len;
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/* Avoid returning uninitialised data on error */
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*data = NULL;
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/* Fetch formatted value length, and return success if non-existent */
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len = fetchf_named_setting ( name, NULL, 0, NULL, 0 );
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if ( len < 0 )
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return 0;
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/* Allocate buffer */
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*data = malloc ( len + 1 /* NUL */ );
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if ( ! *data )
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return -ENOMEM;
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/* Fetch formatted value */
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check_len = fetchf_named_setting ( name, NULL, 0, *data,
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( len + 1 /* NUL */ ) );
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assert ( check_len == len );
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return len;
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}
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/******************************************************************************
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/******************************************************************************
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*
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*
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* Setting types
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* Setting types
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@ -291,6 +291,7 @@ extern int storef_named_setting ( const char *name,
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extern int fetchf_named_setting ( const char *name, char *name_buf,
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extern int fetchf_named_setting ( const char *name, char *name_buf,
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size_t name_len, char *value_buf,
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size_t name_len, char *value_buf,
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size_t value_len );
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size_t value_len );
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extern int fetchf_named_setting_copy ( const char *name, char **data );
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extern char * expand_settings ( const char *string );
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extern char * expand_settings ( const char *string );
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extern struct setting_type setting_type_string __setting_type;
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extern struct setting_type setting_type_string __setting_type;
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