#include #include // strlen #include #include "utillog.h" #define LOGGER_BUFFER_SIZE 256 #define LOGGER_PREFIX_SIZE 32 typedef struct { logger_function callback; void *context; size_t pfxlen; } logger_struct; static logger_struct logger = { 0, NULL, 0 }; static char logger_buffer[LOGGER_BUFFER_SIZE+LOGGER_PREFIX_SIZE]; void loggerf (const char *format, ...) { va_list args; int length; va_start(args, format); length = vsnprintf(logger_buffer + logger.pfxlen, LOGGER_BUFFER_SIZE, format, args); if (length > 0) { if (length > LOGGER_BUFFER_SIZE) length = LOGGER_BUFFER_SIZE; } else { loggerf("logger encoding error '%s'", format); length = (int)strlen(logger_buffer); } length += (int)logger.pfxlen; if (logger.callback) logger.callback(logger_buffer, logger.context); else printf("\n%s\n", logger_buffer); va_end(args); } void logger_callback (logger_function callback, void *context) { logger.callback = callback; logger.context = context; } int logger_prefix (const char *prefix) { size_t pfxlen; pfxlen = strlen(prefix); if (pfxlen > LOGGER_PREFIX_SIZE) return 0; memcpy(logger_buffer, prefix, pfxlen); logger.pfxlen = pfxlen; return 1; }