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diff --git a/src/convenience/convenience.h b/src/convenience/convenience.h
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+/*
+ * Copyright (C) 2014 by Kyle Keen <keenerd@gmail.com>
+ *
+ * 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
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* a collection of user friendly tools */
+
+/*!
+ * Convert standard suffixes (k, M, G) to double
+ *
+ * \param s a string to be parsed
+ * \return double
+ */
+
+double atofs(char *s);
+
+/*!
+ * Convert time suffixes (s, m, h) to double
+ *
+ * \param s a string to be parsed
+ * \return seconds as double
+ */
+
+double atoft(char *s);
+
+/*!
+ * Convert percent suffixe (%) to double
+ *
+ * \param s a string to be parsed
+ * \return double
+ */
+
+double atofp(char *s);
+
+/*!
+ * Find nearest supported gain
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param target_gain in tenths of a dB
+ * \return 0 on success
+ */
+
+int nearest_gain(rtlsdr_dev_t *dev, int target_gain);
+
+/*!
+ * Set device frequency and report status on stderr
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param frequency in Hz
+ * \return 0 on success
+ */
+
+int verbose_set_frequency(rtlsdr_dev_t *dev, uint32_t frequency);
+
+/*!
+ * Set device sample rate and report status on stderr
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param samp_rate in samples/second
+ * \return 0 on success
+ */
+
+int verbose_set_sample_rate(rtlsdr_dev_t *dev, uint32_t samp_rate);
+
+/*!
+ * Enable or disable the direct sampling mode and report status on stderr
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param on 0 means disabled, 1 I-ADC input enabled, 2 Q-ADC input enabled
+ * \return 0 on success
+ */
+
+int verbose_direct_sampling(rtlsdr_dev_t *dev, int on);
+
+/*!
+ * Enable offset tuning and report status on stderr
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \return 0 on success
+ */
+
+int verbose_offset_tuning(rtlsdr_dev_t *dev);
+
+/*!
+ * Enable auto gain and report status on stderr
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \return 0 on success
+ */
+
+int verbose_auto_gain(rtlsdr_dev_t *dev);
+
+/*!
+ * Set tuner gain and report status on stderr
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param gain in tenths of a dB
+ * \return 0 on success
+ */
+
+int verbose_gain_set(rtlsdr_dev_t *dev, int gain);
+
+/*!
+ * Set the frequency correction value for the device and report status on stderr.
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param ppm_error correction value in parts per million (ppm)
+ * \return 0 on success
+ */
+
+int verbose_ppm_set(rtlsdr_dev_t *dev, int ppm_error);
+
+/*!
+ * Reset buffer
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \return 0 on success
+ */
+
+int verbose_reset_buffer(rtlsdr_dev_t *dev);
+
+/*!
+ * Find the closest matching device.
+ *
+ * \param s a string to be parsed
+ * \return dev_index int, -1 on error
+ */
+
+int verbose_device_search(char *s);
+