Embedding PNG Images-Bin2c In C

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// bin2c.c
//
// convert a binary file into a C source vector
//
// THE "BEER-WARE LICENSE" (Revision 3.1415):
// sandro AT sigala DOT it wrote this file. As long as you retain this notice you can do
// whatever you want with this stuff.  If we meet some day, and you think this stuff is
// worth it, you can buy me a beer in return.  Sandro Sigala
//
// syntax:  bin2c [-c] [-z] <input_file> <output_file>
//
//          -c    add the "const" keyword to definition
//          -z    terminate the array with a zero (useful for embedded C strings)
//
// examples:
//     bin2c -c myimage.png myimage_png.cpp
//     bin2c -z sometext.txt sometext_txt.cpp

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

#ifndef PATH_MAX
#define PATH_MAX 1024
#endif

int useconst = 0;
int zeroterminated = 0;

int myfgetc(FILE *f)
{
	int c = fgetc(f);
	if (c == EOF && zeroterminated)
	{
		zeroterminated = 0;
		return 0;
	}
	return c;
}

void process(const char *ifname, const char *ofname)
{
	FILE *ifile, *ofile;
	ifile = fopen(ifname, "rb");
	if (ifile == NULL)
	{
		fprintf(stderr, "cannot open %s for reading\n", ifname);
		exit(1);
	}
	ofile = fopen(ofname, "wb");
	if (ofile == NULL)
	{
		fprintf(stderr, "cannot open %s for writing\n", ofname);
		exit(1);
	}
	char buf[PATH_MAX], *p;
	const char *cp;
	if ((cp = strrchr(ifname, '/')) != NULL)
	{
		++cp;
	} else {
		if ((cp = strrchr(ifname, '\\')) != NULL)
			++cp;
		else
			cp = ifname;
	}
	strcpy(buf, cp);
	for (p = buf; *p != '\0'; ++p)
	{
		if (!isalnum(*p))
			*p = '_';
	}
	fprintf(ofile, "static %sunsigned char %s[] = {\n", useconst ? "const " : "", buf);
	int c, col = 1;
	while ((c = myfgetc(ifile)) != EOF)
	{
		if (col >= 78 - 6)
		{
			fputc('\n', ofile);
			col = 1;
		}
		fprintf(ofile, "0x%.2x, ", c);
		col += 6;
	}
	fprintf(ofile, "\n};\n");

	fclose(ifile);
	fclose(ofile);
}

void usage(void)
{
	fprintf(stderr, "usage: bin2c [-cz] <input_file> <output_file>\n");
	exit(1);
}

int main(int argc, char **argv)
{
	while (argc > 3)
	{
		if (!strcmp(argv[1], "-c"))
		{
			useconst = 1;
			--argc;
			++argv;
		} else if (!strcmp(argv[1], "-z"))
		{
			zeroterminated = 1;
			--argc;
			++argv;
		} else {
			usage();
		}
	}
	if (argc != 3)
	{
		usage();
	}
	process(argv[1], argv[2]);
	return 0;
}