#include <stdio.h>
#include <unistd.h>

int main(){

	int rc = 0;

	FILE *inc = NULL;
	FILE *out = NULL;

	char *incname = "./some.wav";
	char *outname = "./out.wav";

	if( access(incname, R_OK) == -1) {
		printf("E: no readable file '%s' was found\n", incname);
		rc = 1;
		goto safe_fail;
	}

	if( access(outname, F_OK) != -1) {
		printf("E: file '%s' already exists\n", outname);
		rc = 2;
		goto safe_fail;
	}

	inc = fopen(incname, "rb");

	int seekrc = fseek(inc, 0L, SEEK_END);
	if(seekrc != 0){
		printf("E: seek on '%s' failed\n", incname);
		rc = seekrc;
		goto safe_fail;
	}

	long inclen = ftell(inc);
	rewind(inc);

	seekrc = fseek(inc, 44L, SEEK_SET);
	if(seekrc != 0){
		printf("E: seek on '%s' failed\n", incname);
		rc = seekrc;
		goto safe_fail;
	}

	printf("I: len of '%s' is %ldB\n", incname, inclen);

	out = fopen(outname, "wb");

	int count = 0;
	int getrc = 0;
	while(getrc != EOF){

		getrc = fgetc(inc);

		if(count < 45){
			fputc(getrc, out);
			count++;
			continue;
		}

		fputc(getrc - 0, out);

	}

	safe_fail:

	if (inc != NULL) fclose(inc);
	if (out != NULL) fclose(out);

	return rc;
}