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Liblouis User's and Programmer's Manual

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7.17 lou_setLogLevel

typedef enum
{
  LOU_LOG_ALL = 0,
  LOU_LOG_DEBUG = 10000,
  LOU_LOG_INFO = 20000,
  LOU_LOG_WARN = 30000,
  LOU_LOG_ERROR = 40000,
  LOU_LOG_FATAL = 50000,
  LOU_LOG_OFF = 60000
} logLevels;
void lou_setLogLevel (
  logLevels level);

This function can be used to influence the amount of logging, from fatal error messages only to detailed debugging messages. Supported values are LOU_LOG_DEBUG, LOU_LOG_INFO, LOU_LOG_WARN, LOU_LOG_ERROR, LOU_LOG_FATAL and LOU_LOG_OFF. Enabling logging at a given level also enables logging at all higher levels. Setting the level to LOU_LOG_OFF disables logging. The default level is LOU_LOG_INFO.

Alternatively, the LOUIS_LOGLEVEL environment variable can be set to one of all, debug, info, warn, error, fatal, or off. If set, this value will be adopted as the default logging level; however, any calls to lou_setLogLevel() by the application will take precedence. Values are case-insensitive, and if brevity matters, only the first letter (i.e. a for all or w for warn) matters.