bintoc.c

Go to the documentation of this file.

/*
bintoc.c

Convert a (binary) file to a series of comma separated hex values suitable
for initializing a character array in C.
*/

#define _POSIX_C_SOURCE 2

#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

char *progname;
unsigned char buf[1024];

static void fatal(char *fmt, ...);
static void usage(void);

int main(int argc, char *argv[])
{
        int c, i, r, first;
        FILE *file_in, *file_out;
        char *in_name;
        char *o_arg;

        (progname=strrchr(argv[0],'/')) ? progname++ : (progname=argv[0]);

        o_arg= NULL;
        while (c= getopt(argc, argv, "?o:"), c != -1)
        {
                switch(c)
                {
                case '?': usage();
                case 'o': o_arg= optarg; break;
                default:  fatal("getopt failed: '%c'\n", c);
                }
        }

        if (o_arg)
        {
                file_out= fopen(o_arg, "w");
                if (file_out == NULL)
                {
                        fatal("unable to create '%s': %s\n",
                                o_arg, strerror(errno));
                        exit(1);
                }
        }
        else
                file_out= stdout;

        if (optind < argc)
        {
                in_name= argv[optind];
                optind++;
                file_in= fopen(in_name, "r");
                if (file_in == NULL)
                {
                        fatal("unable to open '%s': %s",
                                in_name, strerror(errno));
                }
        }
        else
        {
                in_name= "(stdin)";
                file_in= stdin;
        }

        if (optind != argc)
                usage();

        first= 1;
        for (;;)
        {
                r= fread(buf, 1, sizeof(buf), file_in);
                if (r == 0)
                        break;
                for (i= 0; i<r; i++)
                {
                        if ((i % 8) == 0)
                        {
                                if (first)
                                {
                                        fprintf(file_out, "\t");
                                        first= 0;
                                }
                                else
                                        fprintf(file_out, ",\n\t");
                        }
                        else
                                fprintf(file_out, ", ");
                        fprintf(file_out, "0x%02x", buf[i]);
                }
        }

        if (ferror(file_in))
        {
                fatal("read error on %s: %s\n",
                        in_name, strerror(errno));
        }
        fprintf(file_out, "\n");

        exit(0);
}

static void fatal(char *fmt, ...)
{
        va_list ap;

        fprintf(stderr, "%s: ", progname);

        va_start(ap, fmt);
        vfprintf(stderr, fmt, ap);
        va_end(ap);

        fprintf(stderr, "\n");

        exit(1);
}

static void usage(void)
{
        fprintf(stderr, "Usage: bintoc [-o <out-file>] [<in-file>]\n");
        exit(1);
}

---