dumpfile.c

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 * modification, are permitted provided that the following conditions
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 *
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/**
 * @file dumpfile.c
 *
 * @author Anton Babushkin <anton.babushkin@me.com>
 */

#include <px4_platform_common/px4_config.h>
#include <px4_platform_common/log.h>
#include <px4_platform_common/module.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <termios.h>

#include <systemlib/err.h>

__EXPORT int dumpfile_main(int argc, char *argv[]);

static void print_usage(void)
{
    PRINT_MODULE_DESCRIPTION("Dump file utility. Prints file size and contents in binary mode (don't replace LF with CR LF) to stdout.");

    PRINT_MODULE_USAGE_NAME_SIMPLE("dumpfile", "command");
    PRINT_MODULE_USAGE_ARG("<file>", "File to dump", false);

}

int
dumpfile_main(int argc, char *argv[])
{
    if (argc < 2) {
        print_usage();
        return 1;
    }

    /* open input file */
    FILE *f;
    f = fopen(argv[1], "r");

    if (f == NULL) {
        PX4_ERR("Failed to open file (%i)", errno);
        return 1;
    }

    /* get file size */
    fseek(f, 0L, SEEK_END);
    int size = ftell(f);
    fseek(f, 0L, SEEK_SET);

    printf("File size: %d bytes\n", size);

    /* configure stdout */
    int out = fileno(stdout);

    struct termios tc;
    struct termios tc_old;
    tcgetattr(out, &tc);

    /* save old terminal attributes to restore it later on exit */
    memcpy(&tc_old, &tc, sizeof(tc));

    /* don't add CR on each LF*/
    tc.c_oflag &= ~ONLCR;

    if (tcsetattr(out, TCSANOW, &tc) < 0) {
        PX4_ERR("failed setting stdout attributes");
        fclose(f);
        return 1;
    }

    char buf[512];
    int nread;

    /* dump file */
    while ((nread = fread(buf, 1, sizeof(buf), f)) > 0) {
        if (write(out, buf, nread) <= 0) {
            PX4_ERR("write failed");
            break;
        }
    }

    fsync(out);
    fclose(f);

    /* restore old terminal attributes */
    if (tcsetattr(out, TCSANOW, &tc_old) < 0) {
        PX4_ERR("failed to restore stdout attributes");
        return 1;
    }

    return 0;
}