iio_attr.c

Part of the libiio-utilites, iio_attr is a utility for displaying information about local or remote IIO devices. By providing an optional value, iio_attr will attempt to write the new value to the attribute.

/*
 * iio_attr - part of the Industrial I/O (IIO) utilities
 *
 * Copyright (C) 2014 - 2020 Analog Devices, Inc.
 * Author: Paul Cercueil <paul.cercueil@analog.com>
 *         Robin Getz <robin.getz@analog.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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * */

#include <errno.h>
#include <getopt.h>
#include <iio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include "gen_code.h"
#include "iio_common.h"

#define MY_NAME "iio_attr"

#ifdef _WIN32
#define snprintf sprintf_s
#endif

enum verbosity {
    ATTR_QUIET,
    ATTR_NORMAL,
    ATTR_VERBOSE,
};

static bool str_match(const char * haystack, char * needle, bool ignore)
{
    bool ret = false;
    int i;
    char *ncpy, *hcpy, *idx, first, last;

    if (!haystack || !needle)
        return false;

    if (!strlen(haystack) || !strlen(needle))
        return false;

    /* '.' means match any */
    if (!strcmp(".", needle) || !strcmp("*", needle))
        return true;

    ncpy = cmn_strndup(needle, NAME_MAX);
    hcpy = cmn_strndup(haystack, NAME_MAX);

    if (!ncpy || !hcpy)
        goto eek;

    if (ignore) {
        for (i = 0; hcpy[i]; i++)
            hcpy[i] = (char) (tolower(hcpy[i]) & 0xFF);
        for (i = 0; ncpy[i]; i++)
            ncpy[i] = (char) (tolower(ncpy[i]) & 0xFF);
    }

    first = ncpy[0];
    last = ncpy[strlen(ncpy) - 1];

    if (first != '*' && last == '*') {
        /*  'key*'  */
        ret = !strncmp(hcpy, ncpy, strlen(ncpy) - 1);
    } else if ((first == '*') && (last == '*')) {
        /*  '*key*'  */
        ncpy[strlen(ncpy) - 1] = 0;
        ret = strstr(hcpy, &ncpy[1]);
    } else if ((first == '*') && (last != '*')) {
        /*  '*key'  */
        idx = strstr(hcpy, &ncpy[1]);
        if ((idx + strlen(&ncpy[1])) == (hcpy + strlen(hcpy)))
            ret = true;
    } else {
        /*  'key'  */
        ret = !strcmp(hcpy, ncpy);
    }

eek:
    free(ncpy);
    free(hcpy);

    return ret;
}

static int dump_device_attributes(const struct iio_device *dev,
        const char *attr, const char *wbuf, enum verbosity quiet)
{
    ssize_t ret = 0;
    char *buf = xmalloc(BUF_SIZE, MY_NAME);
    const char *name = iio_device_get_name(dev);

    if (!wbuf || quiet == ATTR_VERBOSE) {
        if (quiet == ATTR_VERBOSE) {
            printf("%s ", iio_device_is_trigger(dev) ? "trig" : "dev");
            if(name)
                printf("'%s'", name);
            else
                printf("'%s'", iio_device_get_id(dev));

            printf(", attr '%s', value :", attr);
        }
        gen_function("device", "dev", attr, NULL);
        ret = iio_device_attr_read(dev, attr, buf, BUF_SIZE);
        if (ret > 0) {
            if (quiet == ATTR_NORMAL)
                printf("%s\n", buf);
            else if (quiet == ATTR_VERBOSE)
                printf("'%s'\n", buf);
        } else {
            iio_strerror(-(int)ret, buf, BUF_SIZE);
            printf("ERROR: %s (%li)\n", buf, (long)ret);
        }
    }
    if (wbuf) {
        gen_function("device", "dev", attr, wbuf);
        ret = iio_device_attr_write(dev, attr, wbuf);
        if (ret > 0) {
            if (quiet == ATTR_VERBOSE)
                printf("wrote %li bytes to %s\n", (long)ret, attr);
            dump_device_attributes(dev, attr, NULL, quiet);
        } else {
            iio_strerror(-(int)ret, buf, BUF_SIZE);
            printf("ERROR: %s (%li) while writing '%s' with '%s'\n",
                    buf, (long)ret, attr, wbuf);
        }
    }
    free(buf);

    return (int)ret;
}

static int dump_buffer_attributes(const struct iio_device *dev,
                  const char *attr, const char *wbuf, enum verbosity quiet)
{
    ssize_t ret = 0;
    char *buf = xmalloc(BUF_SIZE, MY_NAME);
    const char *name = iio_device_get_name(dev);

    if (!wbuf || quiet == ATTR_VERBOSE ) {
        gen_function("device_buffer", "dev", attr, NULL);
        ret = iio_device_buffer_attr_read(dev, attr, buf, BUF_SIZE);

        if (quiet == ATTR_VERBOSE) {
            printf("%s ", iio_device_is_trigger(dev) ? "trig" : "dev");
            if (name)
                printf("'%s'", name);
            else
                printf("'%s'", iio_device_get_id(dev));

            printf(", buffer attr '%s', value :", attr);
        }

        if (ret > 0) {
            if (quiet == ATTR_NORMAL)
                printf("%s\n", buf);
            else  if (quiet == ATTR_VERBOSE)
                printf("'%s'\n", buf);
        } else {
            iio_strerror(-(int)ret, buf, BUF_SIZE);
            printf("ERROR: %s (%li)\n", buf, (long)ret);
        }
    }

    if (wbuf) {
        gen_function("device_buffer", "dev", attr, wbuf);
        ret = iio_device_buffer_attr_write(dev, attr, wbuf);
        if (ret > 0) {
            if (quiet == ATTR_VERBOSE)
                printf("wrote %li bytes to %s\n", (long)ret, attr);
            dump_buffer_attributes(dev, attr, NULL, quiet);
        } else {
            iio_strerror(-(int)ret, buf, BUF_SIZE);
            printf("ERROR: %s (%li) while writing '%s' with '%s'\n",
                    buf, (long)ret, attr, wbuf);
        }
    }

    free(buf);
    return (int)ret;
}

static int dump_debug_attributes(const struct iio_device *dev,
                  const char *attr, const char *wbuf, enum verbosity quiet)
{
    ssize_t ret = 0;
    char *buf = xmalloc(BUF_SIZE, MY_NAME);
    const char *name = iio_device_get_name(dev);

    if (!wbuf || quiet == ATTR_VERBOSE) {
        gen_function("device_debug", "dev", attr, NULL);
        ret = iio_device_debug_attr_read(dev, attr, buf, BUF_SIZE);

        if (quiet == ATTR_VERBOSE) {
            printf("%s ", iio_device_is_trigger(dev) ? "trig" : "dev");
            if (name)
                printf("'%s'", name);
            else
                printf("'%s'", iio_device_get_id(dev));

            printf(", debug attr '%s', value :", attr);

        }

        if (ret > 0) {
            if (quiet == ATTR_NORMAL)
                printf("%s\n", buf);
            else if (quiet == ATTR_VERBOSE)
                printf("'%s'\n", buf);
        } else {
            iio_strerror(-(int)ret, buf, BUF_SIZE);
            printf("ERROR: %s (%li)\n", buf, (long)ret);
        }
    }

    if (wbuf) {
        gen_function("device_debug", "dev", attr, wbuf);
        ret = iio_device_debug_attr_write(dev, attr, wbuf);
        if (ret > 0) {
            if (quiet == ATTR_VERBOSE)
                printf("wrote %li bytes to %s\n", (long)ret, attr);
            dump_debug_attributes(dev, attr, NULL, quiet);
        } else {
            iio_strerror(-(int)ret, buf, BUF_SIZE);
            printf("ERROR: %s (%li) while writing '%s' with '%s'\n",
                    buf, (long)ret, attr, wbuf);
        }
    }

    free(buf);
    return (int)ret;
}

static int dump_channel_attributes(const struct iio_device *dev,
        struct iio_channel *ch, const char *attr, const char *wbuf, enum verbosity quiet)
{
    ssize_t ret = 0;
    char *buf = xmalloc(BUF_SIZE, MY_NAME);
    const char *type_name;
    const char *name = iio_device_get_name(dev);

    if (!wbuf || quiet == ATTR_VERBOSE) {
        if (iio_channel_is_output(ch))
            type_name = "output";
        else
            type_name = "input";

        gen_function("channel", "ch", attr, NULL);
        ret = iio_channel_attr_read(ch, attr, buf, BUF_SIZE);
        if (quiet == ATTR_VERBOSE) {
            printf("%s ", iio_device_is_trigger(dev) ? "trig" : "dev");
            if (name)
                printf("'%s'", name);
            else
                printf("'%s'", iio_device_get_id(dev));

            printf(", channel '%s' (%s), ",
                    iio_channel_get_id(ch),
                    type_name);
        }
        if (iio_channel_get_name(ch) && quiet == ATTR_VERBOSE)
            printf("id '%s', ", iio_channel_get_name(ch));

        if (quiet == ATTR_VERBOSE)
            printf("attr '%s', ", attr);

        if (ret > 0) {
            if (quiet == ATTR_NORMAL)
                printf("%s\n", buf);
            else if (quiet == ATTR_VERBOSE)
                printf("value '%s'\n", buf);
        } else {
            iio_strerror(-(int)ret, buf, BUF_SIZE);
            printf("ERROR: %s (%li)\n", buf, (long)ret);
        }
    }
    if (wbuf) {
        gen_function("channel", "ch", attr, wbuf);
        ret = iio_channel_attr_write(ch, attr, wbuf);
        if (ret > 0) {
            if (quiet == ATTR_VERBOSE)
                printf("wrote %li bytes to %s\n", (long)ret, attr);
            dump_channel_attributes(dev, ch, attr, NULL, quiet);
        } else {
            iio_strerror(-(int)ret, buf, BUF_SIZE);
            printf("error %s (%li) while writing '%s' with '%s'\n",
                    buf, (long)ret, attr, wbuf);
        }
    }
    free(buf);
    return (int)ret;
}

static const struct option options[] = {
    {"ignore-case", no_argument, 0, 'I'},
    {"quiet", no_argument, 0, 'q'},
    {"verbose", no_argument, 0, 'v'},
    {"generate-code", required_argument, 0, 'g'},
    /* Channel qualifiers */
    {"input-channel", no_argument, 0, 'i'},
    {"output-channel", no_argument, 0, 'o'},
    {"scan-channel", no_argument, 0, 's'},
    /* Attribute type */
    {"device-attr", no_argument, 0, 'd'},
    {"channel-attr", no_argument, 0, 'c'},
    {"context-attr", no_argument, 0, 'C'},
    {"buffer-attr", no_argument, 0, 'B'},
    {"debug-attr", no_argument, 0, 'D'},
    {0, 0, 0, 0},
};

static const char *options_descriptions[] = {
    "-d [device] [attr] [value]\n"
        "\t\t\t\t-c [device] [channel] [attr] [value]\n"
        "\t\t\t\t-B [device] [attr] [value]\n"
        "\t\t\t\t-D [device] [attr] [value]\n"
        "\t\t\t\t-C [attr]",
    /* help */
    "Ignore case distinctions.",
    "Return result only.",
    "Verbose, say what is going on",
    "Generate code.",
    /* Channel qualifiers */
    "Filter Input Channels only.",
    "Filter Output Channels only.",
    "Filter Scan Channels only.",
    /* attribute type */
    "Read/Write device attributes",
    "Read/Write channel attributes.",
    "Read IIO context attributes.",
    "Read/Write buffer attributes.",
    "Read/Write debug attributes.",
};

#define MY_OPTS "CdcBDiosIqvg:"
int main(int argc, char **argv)
{
    char **argw;
    struct iio_context *ctx;
    int c;
    int device_index = 0, channel_index = 0, attr_index = 0;
    const char *gen_file = NULL;
    bool search_device = false, ignore_case = false,
        search_channel = false, search_buffer = false, search_debug = false,
        search_context = false, input_only = false, output_only = false,
        scan_only = false, gen_code = false;
    enum verbosity quiet = ATTR_NORMAL;
    bool found_err = false, read_err = false, write_err = false,
        dev_found = false, attr_found = false, ctx_found = false,
        debug_found = false, channel_found = false ;
    bool context_scan = false;
    unsigned int i;
    char *wbuf = NULL;
    struct option *opts;

    argw = dup_argv(MY_NAME, argc, argv);

    ctx = handle_common_opts(MY_NAME, argc, argw, MY_OPTS, options, options_descriptions);
    opts = add_common_options(options);
    if (!opts) {
        fprintf(stderr, "Failed to add common options\n");
        return EXIT_FAILURE;
    }
    while ((c = getopt_long(argc, argw, "+" COMMON_OPTIONS MY_OPTS, /* Flawfinder: ignore */
                    opts, NULL)) != -1) {
        switch (c) {
        /* All these are handled in the common */
        case 'h':
        case 'n':
        case 'x':
        case 'u':
            break;
        case 'S':
            context_scan = true;
            /* FALLTHRU */
        case 'a':
            if (!optarg && argc > optind && argv[optind] != NULL
                    && argv[optind][0] != '-')
                optind++;
            break;
        /* Attribute type
         * 'd'evice, 'c'hannel, 'C'ontext, 'B'uffer or 'D'ebug
         */
        case 'd':
            search_device = true;
            break;
        case 'c':
            search_channel = true;
            break;
        case 'B':
            search_buffer = true;
            break;
        case 'D':
            search_debug = true;
            break;
        case 'C':
            search_context = true;
            break;
        /* Channel qualifiers */
        case 'i':
            input_only = true;
            break;
        case 'o':
            output_only = true;
            break;
        case 's':
            scan_only = true;
            break;
        /* options */
        case 'I':
            ignore_case = true;
            break;
        case 'q':
            quiet = ATTR_QUIET;
            break;
        case 'v':
            quiet = ATTR_VERBOSE;
            break;
        case 'g':
            if (!optarg || optarg[0] == '-') {
                fprintf(stderr, "Code generation requires an option\n");
                return EXIT_FAILURE;
            }
            gen_code = true;
            gen_file = optarg;
            break;
        case '?':
            printf("Unknown argument '%c'\n", c);
            return EXIT_FAILURE;
        }
    }

    free(opts);

    if (context_scan)
        return EXIT_SUCCESS;

    if (!ctx)
        return EXIT_FAILURE;

    if (gen_code) {
        if (!gen_test_path(gen_file)) {
            fprintf(stderr, "Can't write to %s to generate file\n", gen_file);
            return EXIT_FAILURE;
        }
    }

    if ((search_device + search_channel + search_context + search_debug + search_buffer) >= 2 ) {
        fprintf(stderr, "The options -d, -c, -C, -B, and -D are exclusive"
                " (can use only one).\n");
        return EXIT_FAILURE;
    }

    if (!(search_device + search_channel + search_context + search_debug + search_buffer)) {
        if (argc == 1) {
            usage(MY_NAME, options, options_descriptions);
            return EXIT_SUCCESS;
        }
        fprintf(stderr, "must specify one of -d, -c, -C, -B or -D.\n");
        return EXIT_FAILURE;
    }

    if (search_context) {
        /* -C [IIO_attribute] */
        if (argc >= optind + 1)
            attr_index = optind;
        if (argc >= optind + 2) {
            fprintf(stderr, "Too many options for searching for context attributes\n");
            return EXIT_FAILURE;
        }
        if (gen_code && !attr_index) {
            printf("When generating code for Context Attributes, must include specific attribute\n"
                    "-C [IIO_context_attribute]\n");
            return EXIT_FAILURE;
        }
    } else if (search_device) {
        /* -d [device] [attr] [value] */
        if (argc >= optind + 1)
            device_index = optind;
        if (argc >= optind + 2)
            attr_index = optind + 1;
        if (argc >= optind + 3)
            wbuf = argw[optind + 2];
        if (argc >= optind + 4) {
            fprintf(stderr, "Too many options for searching for device attributes\n");
            return EXIT_FAILURE;
        }
        if (gen_code && !attr_index) {
            printf("When generating code for device Attributes, must include specific attribute\n"
                    "-d [IIO_device] [IIO_device_attr] [value]\n");
            return EXIT_FAILURE;
        }
    } else if (search_channel) {
        /* -c [device] [channel] [attr] [value] */
        if (argc >= optind + 1)
            device_index = optind;
        if (argc >= optind + 2)
            channel_index = optind + 1;
        if (argc >= optind + 3)
            attr_index = optind + 2;
        if (argc >= optind + 4)
            wbuf = argw[optind + 3];
        if (argc >= optind + 5) {
            fprintf(stderr, "Too many options for searching for channel attributes\n");
            return EXIT_FAILURE;
        }
        if (gen_code && !attr_index) {
            printf("When generating code for Channel Attributes, must include specific attribute\n"
                    "-c [IIO_device] [IIO_device_channel] [IIO_channel_attr] [value]\n");
            return EXIT_FAILURE;
        }
    } else if (search_buffer) {
        /* -B [device] [attribute] [value] */
        if (argc >= optind + 1)
            device_index = optind;
        if (argc >= optind + 2)
            attr_index = optind + 1;
        if (argc >= optind + 3)
            wbuf = argw[optind + 2];
        if (argc >= optind + 4) {
            fprintf(stderr, "Too many options for searching for buffer attributes\n");
            return EXIT_FAILURE;
        }
        if (gen_code && !attr_index) {
            printf("When generating code for Buffer Attributes, must include specific attribute\n"
                    "-B [IIO_device] [IIO_buffer_attribute] [value]\n");
            return EXIT_FAILURE;
        }

    } else if (search_debug) {
        /* -D [device] [attribute] [value] */
        if (argc >= optind + 1)
            device_index = optind;
        if (argc >= optind + 2)
            attr_index = optind + 1;
        if (argc >= optind + 3)
            wbuf = argw[optind + 2];
        if (argc >= optind + 4) {
            fprintf(stderr, "Too many options for searching for device attributes\n");
            return EXIT_FAILURE;
        }
        if (gen_code && !attr_index) {
            printf("When generating code for Debug Attributes, must include specific attribute\n"
                    "-D [IIO_device] [IIO_debug_attribute] [value]\n");
            return EXIT_FAILURE;
        }
    } else {
        fprintf(stderr, "error in application\n");
        return EXIT_FAILURE;
    }

    if (device_index && !argw[device_index])
        return EXIT_FAILURE;
    if (channel_index && !argw[channel_index])
        return EXIT_FAILURE;
    if (attr_index && !argw[attr_index])
        return EXIT_FAILURE;
    /* check for wildcards */
    if (((device_index && (!strcmp(".", argw[device_index]) ||
                strchr(argw[device_index], '*'))) ||
            (channel_index && (!strcmp(".", argw[channel_index]) ||
                strchr(argw[channel_index], '*'))) ||
            (attr_index && (!strcmp(".", argw[attr_index])  ||
                strchr(argw[attr_index], '*'))))) {
        if (gen_code || wbuf) {
            printf("can't %s with wildcard match\n",
                    gen_code ? "generate code" : "write value");
            return EXIT_FAILURE;
        }
        /* Force verbose mode */
        quiet = ATTR_VERBOSE;
    }

    if (gen_code) {
        gen_start(gen_file);
        gen_context(iio_context_get_attr_value(ctx, "uri"));
    }

    if (search_context) {
        unsigned int nb_ctx_attrs = iio_context_get_attrs_count(ctx);
        if (!attr_index && nb_ctx_attrs > 0)
            printf("IIO context with %u attributes:\n", nb_ctx_attrs);
        if (!attr_index && !nb_ctx_attrs) {
            printf("%s: Found context, but it has %u context attributes\n",
                    MY_NAME, nb_ctx_attrs);
            found_err = true;
        }

        ctx_found = true;
        for (i = 0; i < nb_ctx_attrs; i++) {
            const char *key, *value;
            ssize_t ret;

            ret = iio_context_get_attr(ctx, i, &key, &value);
            if (!ret) {
                if (!attr_index || str_match(key, argw[attr_index], ignore_case)) {
                    found_err = false;
                    attr_found = true;
                    printf("%s: %s\n", key, value);
                    gen_context_attr(key);
                }
            } else {
                char *buf = xmalloc(BUF_SIZE, MY_NAME);
                iio_strerror(errno, buf, BUF_SIZE);
                fprintf(stderr, "Unable to get context attributes: %s (%zd)\n",
                        buf, ret);
                free(buf);
            }
        }
    }

    if (search_device || search_channel || search_buffer || search_debug) {
        unsigned int nb_devices = iio_context_get_devices_count(ctx);

        if (!device_index)
            printf("IIO context has %u devices:\n", nb_devices);

        for (i = 0; i < nb_devices; i++) {
            const struct iio_device *dev = iio_context_get_device(ctx, i);
            const char *name = iio_device_get_name(dev);
            const char *ch_name;
            const char *dev_id = iio_device_get_id(dev);
            unsigned int nb_attrs, nb_channels, j;

            if (device_index && !str_match(dev_id, argw[device_index], ignore_case)
                    && !str_match(name, argw[device_index], ignore_case)) {
                continue;
            }
            dev_found = true;

            if ((search_device && !device_index) || (search_channel && !device_index) ||
                    (search_buffer && !device_index) || (search_debug && !device_index)) {
                printf("\t%s", dev_id);
                if (name)
                    printf(", %s", name);
                printf(": ");
            }

            nb_channels = iio_device_get_channels_count(dev);

            if (search_channel && !device_index) {
                if (scan_only || input_only || output_only) {
                    unsigned int scan = 0, in = 0, out = 0;
                    for (j = 0; j < nb_channels; j++) {
                        struct iio_channel *ch;
                        ch = iio_device_get_channel(dev, j);
                        if (iio_channel_is_output(ch))
                            out++;
                        else
                            in++;
                        if (iio_channel_is_scan_element(ch))
                            scan++;
                    }
                    printf("found ");
                    if (scan_only)
                        printf("%u scan", scan);
                    if (output_only) {
                        if (scan_only)
                            printf(", ");
                        printf("%u output", out);
                    }
                    if (input_only) {
                        if (scan_only || output_only)
                            printf(", ");
                        printf("%u input", in);
                    }
                    printf(" channels\n");
                } else {
                    printf("found %u channels\n", nb_channels);
                }
            }

            if (search_channel && device_index && !channel_index && !nb_channels) {
                printf("%s: Found %s device, but it has %u channels\n",
                        MY_NAME, argw[device_index], nb_channels);
                found_err = true;
            }
            for (j = 0; j < nb_channels; j++) {
                struct iio_channel *ch;
                const char *type_name;
                unsigned int k;

                if (!search_channel || !device_index)
                    continue;

                ch = iio_device_get_channel(dev, j);

                if (input_only && iio_channel_is_output(ch))
                    continue;
                if (output_only && !iio_channel_is_output(ch))
                    continue;
                if (scan_only && !iio_channel_is_scan_element(ch))
                    continue;

                if (iio_channel_is_output(ch))
                    type_name = "output";
                else
                    type_name = "input";

                ch_name = iio_channel_get_name(ch);
                if (channel_index &&
                        !str_match(iio_channel_get_id(ch),
                        argw[channel_index], ignore_case) &&
                        (!ch_name || !str_match(ch_name,argw[channel_index], ignore_case)))
                    continue;

                channel_found = true;
                if ((!scan_only && !channel_index) ||
                    ( scan_only && iio_channel_is_scan_element(ch))) {
                    printf("%s ", iio_device_is_trigger(dev) ? "trig" : "dev");
                    if (name)
                        printf("'%s', ", name);
                    else
                        printf("'%s', ", dev_id);

                    printf("channel '%s'",
                        iio_channel_get_id(ch));

                    if (ch_name)
                        printf(", id '%s'", ch_name);

                    printf(" (%s", type_name);

                    if (iio_channel_is_scan_element(ch)) {
                        const struct iio_data_format *format =
                            iio_channel_get_data_format(ch);
                        char sign = format->is_signed ? 's' : 'u';
                        char repeat[12] = "";

                        if (format->is_fully_defined)
                            sign += 'A' - 'a';

                        if (format->repeat > 1)
                            snprintf(repeat, sizeof(repeat), "X%u",
                                format->repeat);
                        printf(", index: %lu, format: %ce:%c%u/%u%s>>%u)",
                                iio_channel_get_index(ch),
                                format->is_be ? 'b' : 'l',
                                sign, format->bits,
                                format->length, repeat,
                                    format->shift);
                        if (scan_only)
                            printf("\n");
                        else
                            printf(", ");
                    } else {
                        printf("), ");
                    }

                }

                nb_attrs = iio_channel_get_attrs_count(ch);
                if (!channel_index)
                    printf("found %u channel-specific attributes\n",
                            nb_attrs);
                /* search_channel & device_index are checked in L630 */
                if(channel_index && !attr_index && !nb_attrs) {
                    printf("%s: Found %s device, but it has %u channel attributes\n",
                            MY_NAME, argw[device_index], nb_attrs);
                    found_err = true;
                }

                if (!nb_attrs || !channel_index)
                    continue;

                for (k = 0; k < nb_attrs; k++) {
                    int ret;
                    const char *attr =
                        iio_channel_get_attr(ch, k);

                    if (attr_index &&
                        !str_match(attr, argw[attr_index],
                            ignore_case))
                        continue;
                    gen_dev(dev);
                    found_err = false;
                    attr_found = true;
                    gen_ch(ch);
                    ret = dump_channel_attributes(dev, ch, attr, wbuf,
                                attr_index ? quiet : ATTR_VERBOSE);
                    if (wbuf && ret < 0)
                        write_err = true;
                    else if (ret < 0 && attr_index)
                        read_err = true;
                }
            }

            nb_attrs = iio_device_get_attrs_count(dev);
            if (search_device && !device_index)
                printf("found %u device attributes\n", nb_attrs);
            if (search_device && device_index && !attr_index && !nb_attrs) {
                printf("%s: Found %s device, but it has %u device attributes\n",
                        MY_NAME, name ? name : dev_id, nb_attrs);
                if (!attr_found)
                    found_err = true;
            }

            if (search_device && device_index && nb_attrs) {
                int ret;
                for (j = 0; j < nb_attrs; j++) {
                    const char *attr = iio_device_get_attr(dev, j);

                    if (attr_index &&
                        !str_match(attr, argw[attr_index], ignore_case))
                        continue;

                    gen_dev(dev);
                    found_err = false;
                    attr_found = true;
                    ret = dump_device_attributes(dev, attr, wbuf,
                                   attr_index ? quiet : ATTR_VERBOSE);
                    if (wbuf && ret < 0)
                        write_err = true;
                    else if (ret < 0 && attr_index)
                        read_err = true;
                }
            }

            nb_attrs = iio_device_get_buffer_attrs_count(dev);

            if (search_buffer && !device_index)
                printf("found %u buffer attributes\n", nb_attrs);
            if (search_buffer && device_index && !attr_index && !nb_attrs) {
                printf("%s: Found %s device, but it has %u buffer attributes\n",
                        MY_NAME, name ? name : dev_id, nb_attrs);
                if (!attr_found)
                    found_err = true;
            }

            if (search_buffer && device_index && nb_attrs) {
                for (j = 0; j < nb_attrs; j++) {
                    int ret;
                    const char *attr = iio_device_get_buffer_attr(dev, j);

                    if ((attr_index && str_match(attr, argw[attr_index],
                                ignore_case)) || !attr_index) {
                        gen_dev(dev);
                        found_err = false;
                        attr_found = true;
                        ret = dump_buffer_attributes(dev, attr, wbuf,
                                      attr_index ? quiet : ATTR_VERBOSE);
                        if (wbuf && ret < 0)
                            write_err = true;
                        else if (ret < 0 && attr_index)
                            read_err = true;
                    }
                }

            }

            nb_attrs = iio_device_get_debug_attrs_count(dev);

            if (search_debug && !device_index)
                printf("found %u debug attributes\n", nb_attrs);

            if (search_debug && device_index && nb_attrs) {
                for (j = 0; j < nb_attrs; j++) {
                    int ret;
                    const char *attr = iio_device_get_debug_attr(dev, j);

                    if ((attr_index && str_match(attr, argw[attr_index],
                                ignore_case)) || !attr_index) {
                        gen_dev(dev);
                        found_err = false;
                        attr_found = true;
                        debug_found = true;
                        ret = dump_debug_attributes(dev, attr, wbuf,
                                      attr_index ? quiet : ATTR_VERBOSE);
                        if (wbuf && ret < 0)
                            write_err = true;
                        else if (ret < 0 && attr_index)
                            read_err = true;
                    }
                }

            }
        }

    }

    iio_context_destroy(ctx);

    if (gen_code)
        gen_context_destroy();

    if (!dev_found && device_index)
        fprintf(stderr, "%s: Error : could not find device (%s)\n", MY_NAME, argw[device_index]);
    else if (!ctx_found && search_context)
        fprintf(stderr, "%s: Error : could not find Context Attributes\n", MY_NAME);
    else if (!channel_found && channel_index) {
        if (input_only)
            fprintf(stderr, "%s: Error : could not find Input channel (%s)\n", MY_NAME, argw[channel_index]);
        if (output_only)
            fprintf(stderr, "%s: Error : could not find Output channel (%s)\n", MY_NAME, argw[channel_index]);
        if (scan_only)
            fprintf(stderr, "%s: Error : could not find Scan channel (%s)\n", MY_NAME, argw[channel_index]);
        if (!input_only && !output_only && !scan_only)
            fprintf(stderr, "%s: Error : could not find channel (%s)\n", MY_NAME, argw[channel_index]);
    } else if (!attr_found && attr_index)
        fprintf(stderr, "%s: Error : could not find attribute (%s)\n", MY_NAME, argw[attr_index]);
    else if (!debug_found && search_debug && device_index) {
        fprintf(stderr, "%s: Error : device (%s) had 0 debug attributes\n", MY_NAME, argw[device_index]);
    }

    free_argw(argc, argw);

    if ((!dev_found && device_index) || (!ctx_found && search_context) ||
            (!channel_found && channel_index) || (!attr_found && attr_index) ||
            (!debug_found && search_debug && device_index))
        return EXIT_FAILURE;

    if (write_err || read_err || found_err)
        return EXIT_FAILURE;

    return EXIT_SUCCESS;
}