X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=log.c;h=3344d174ad4914c6c3f55b4d722cea1945bf8327;hb=7e41e319d9a76da527eaa6e2708e4909ffd0d971;hp=22dcc107d020fa0a165834a030baff49bf5a0043;hpb=b08024a8363c7a019bebc05a25e2689e774326e8;p=libsigrok.git diff --git a/log.c b/log.c index 22dcc107..3344d174 100644 --- a/log.c +++ b/log.c @@ -1,7 +1,7 @@ /* * This file is part of the sigrok project. * - * Copyright (C) 2011 Uwe Hermann + * Copyright (C) 2011-2012 Uwe Hermann * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -20,77 +20,243 @@ #include #include -#include -#include +#include "sigrok.h" +#include "sigrok-internal.h" -static int sr_logv(int loglevel, const char *format, va_list args) +/* Currently selected libsigrok loglevel. Default: SR_LOG_WARN. */ +static int sr_loglevel = SR_LOG_WARN; /* Show errors+warnings per default. */ + +/* Function prototype. */ +static int sr_logv(void *cb_data, int loglevel, const char *format, + va_list args); + +/* Pointer to the currently selected log callback. Default: sr_logv(). */ +static sr_log_callback_t sr_log_callback = sr_logv; + +/* + * Pointer to private data that can be passed to the log callback. + * This can be used (for example) by C++ GUIs to pass a "this" pointer. + */ +static void *sr_log_callback_data = NULL; + +/* Log domain (a short string that is used as prefix for all messages). */ +#define LOGDOMAIN_MAXLEN 30 +#define LOGDOMAIN_DEFAULT "sr: " +static char sr_log_domain[LOGDOMAIN_MAXLEN + 1] = LOGDOMAIN_DEFAULT; + +/** + * Set the libsigrok loglevel. + * + * This influences the amount of log messages (debug messages, error messages, + * and so on) libsigrok will output. Using SR_LOG_NONE disables all messages. + * + * Note that this function itself will also output log messages. After the + * loglevel has changed, it will output a debug message with SR_LOG_DBG for + * example. Whether this message is shown depends on the (new) loglevel. + * + * @param loglevel The loglevel to set (SR_LOG_NONE, SR_LOG_ERR, SR_LOG_WARN, + * SR_LOG_INFO, SR_LOG_DBG, or SR_LOG_SPEW). + * + * @return SR_OK upon success, SR_ERR_ARG upon invalid loglevel. + */ +SR_API int sr_log_loglevel_set(int loglevel) +{ + if (loglevel < SR_LOG_NONE || loglevel > SR_LOG_SPEW) { + sr_err("Invalid loglevel %d.", loglevel); + return SR_ERR_ARG; + } + + sr_loglevel = loglevel; + + sr_dbg("libsigrok loglevel set to %d.", loglevel); + + return SR_OK; +} + +/** + * Get the libsigrok loglevel. + * + * @return The currently configured libsigrok loglevel. + */ +SR_API int sr_log_loglevel_get(void) +{ + return sr_loglevel; +} + +/** + * Set the libsigrok logdomain string. + * + * @param logdomain The string to use as logdomain for libsigrok log + * messages from now on. Must not be NULL. The maximum + * length of the string is 30 characters (this does not + * include the trailing NUL-byte). Longer strings are + * silently truncated. + * In order to not use a logdomain, pass an empty string. + * The function makes its own copy of the input string, i.e. + * the caller does not need to keep it around. + * + * @return SR_OK upon success, SR_ERR_ARG upon invalid logdomain. + */ +SR_API int sr_log_logdomain_set(const char *logdomain) +{ + if (!logdomain) { + sr_err("log: %s: logdomain was NULL", __func__); + return SR_ERR_ARG; + } + + /* TODO: Error handling. */ + snprintf((char *)&sr_log_domain, LOGDOMAIN_MAXLEN, "%s", logdomain); + + sr_dbg("Log domain set to '%s'.", (const char *)&sr_log_domain); + + return SR_OK; +} + +/** + * Get the currently configured libsigrok logdomain. + * + * @return A copy of the currently configured libsigrok logdomain + * string. The caller is responsible for g_free()ing the string when + * it is no longer needed. + */ +SR_API char *sr_log_logdomain_get(void) +{ + return g_strdup((const char *)&sr_log_domain); +} + +/** + * Set the libsigrok log callback to the specified function. + * + * @param cb Function pointer to the log callback function to use. + * Must not be NULL. + * @param cb_data Pointer to private data to be passed on. This can be used by + * the caller to pass arbitrary data to the log functions. This + * pointer is only stored or passed on by libsigrok, and is + * never used or interpreted in any way. The pointer is allowed + * to be NULL if the caller doesn't need/want to pass any data. + * + * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments. + */ +SR_API int sr_log_callback_set(sr_log_callback_t cb, void *cb_data) +{ + if (!cb) { + sr_err("log: %s: cb was NULL", __func__); + return SR_ERR_ARG; + } + + /* Note: 'cb_data' is allowed to be NULL. */ + + sr_log_callback = cb; + sr_log_callback_data = cb_data; + + return SR_OK; +} + +/** + * Set the libsigrok log callback to the default built-in one. + * + * Additionally, the internal 'sr_log_callback_data' pointer is set to NULL. + * + * @return SR_OK upon success, a negative error code otherwise. + */ +SR_API int sr_log_callback_set_default(void) +{ + /* + * Note: No log output in this function, as it should safely work + * even if the currently set log callback is buggy/broken. + */ + sr_log_callback = sr_logv; + sr_log_callback_data = NULL; + + return SR_OK; +} + +static int sr_logv(void *cb_data, int loglevel, const char *format, va_list args) { int ret; - /* Avoid compiler warnings. */ - loglevel = loglevel; + /* This specific log callback doesn't need the void pointer data. */ + (void)cb_data; + + /* Only output messages of at least the selected loglevel(s). */ + if (loglevel > sr_loglevel) + return SR_OK; /* TODO? */ + if (sr_log_domain[0] != '\0') + fprintf(stderr, "%s", sr_log_domain); ret = vfprintf(stderr, format, args); fprintf(stderr, "\n"); return ret; } -int sr_log(int loglevel, const char *format, ...) +SR_PRIV int sr_log(int loglevel, const char *format, ...) +{ + int ret; + va_list args; + + va_start(args, format); + ret = sr_log_callback(sr_log_callback_data, loglevel, format, args); + va_end(args); + + return ret; +} + +SR_PRIV int sr_spew(const char *format, ...) { int ret; va_list args; va_start(args, format); - ret = sr_logv(loglevel, format, args); + ret = sr_log_callback(sr_log_callback_data, SR_LOG_SPEW, format, args); va_end(args); return ret; } -int sr_dbg(const char *format, ...) +SR_PRIV int sr_dbg(const char *format, ...) { int ret; va_list args; va_start(args, format); - ret = sr_logv(SR_LOG_DBG, format, args); + ret = sr_log_callback(sr_log_callback_data, SR_LOG_DBG, format, args); va_end(args); return ret; } -int sr_info(const char *format, ...) +SR_PRIV int sr_info(const char *format, ...) { int ret; va_list args; va_start(args, format); - ret = sr_logv(SR_LOG_INFO, format, args); + ret = sr_log_callback(sr_log_callback_data, SR_LOG_INFO, format, args); va_end(args); return ret; } -int sr_warn(const char *format, ...) +SR_PRIV int sr_warn(const char *format, ...) { int ret; va_list args; va_start(args, format); - ret = sr_logv(SR_LOG_WARN, format, args); + ret = sr_log_callback(sr_log_callback_data, SR_LOG_WARN, format, args); va_end(args); return ret; } -int sr_err(const char *format, ...) +SR_PRIV int sr_err(const char *format, ...) { int ret; va_list args; va_start(args, format); - ret = sr_logv(SR_LOG_ERR, format, args); + ret = sr_log_callback(sr_log_callback_data, SR_LOG_ERR, format, args); va_end(args); return ret;