Simple utility to convert flat binary files into C objects

bin2c.c

#include <stdio.h>
#include <ctype.h>
#include <string.h>

int main(int argc, char ** argv) {
    static char label[BUFSIZ];
    strcpy(label, "FILE_");
    if (argc < 3) {
        fprintf(stderr, "usage: %s INPUT OUTPUT\n"
                        "ERROR: insufficient arguments\n", argv[0]);
        return 1;
    }
    FILE * infile = fopen(argv[1], "rb");
    FILE * outfile = fopen(argv[2], "w");
    if (!(infile && outfile)) {
        if (infile) fclose(infile); else fprintf(stderr, "ERROR: unable to open file \"%s\" for reading\n", argv[1]);
        if (outfile) fclose(outfile); else fprintf(stderr, "ERROR: unable to open file \"%s\" for writing\n", argv[2]);
        return 1;
    }
    strcat(label, argv[1]);
    for (int i = 0; label[i]; i++) {
        if (!isalnum(label[i])) label[i] = '_';
    }
    fprintf(outfile, "const u8 %s[] = {", label);
    unsigned char curr;
    int i = 0;
    while (!feof(infile)) {
        if (i % 16 == 0) {
            fputs("\n    ", outfile);
        }
        fread(&curr, 1, 1, infile);
        fprintf(outfile, "0x%02x%s", curr, feof(infile) ? "" : ",");
        i++;
    }
    fputs("\n};\n", outfile);
    fclose(outfile);
    fclose(infile);
    return 0;
}