Viewing file:  mksimage.c (2.24 KB) -rw-r--r--
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/*
* BK Id: SCCS/s.mksimage.c 1.7 10/11/01 11:59:05 trini
*/
/*
*
*
*
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#define SIZE 1024
#define BLOCK_ALIGN(x) (((x)+SIZE-1)&(~(SIZE-1)))
static void
die(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
fputc('\n', stderr);
exit(1);
}
static void
usage(void)
{
printf("Usage: mkbinimg <bootstrap> <kernel> <ramdisk> -o <binary>\n");
exit(1);
}
static int
copy_blocks(int ifd, int ofd, unsigned long *offset, unsigned long *size)
{
off_t cur;
int amt;
unsigned long len = 0;
char buffer[SIZE];
cur = lseek(ofd, 0, SEEK_CUR);
if (cur % SIZE) {
cur = BLOCK_ALIGN(cur);
cur = lseek(ofd, cur, SEEK_SET);
}
*offset = (unsigned long) cur;
while((amt = read(ifd, buffer, SIZE)) > 0) {
write(ofd, buffer, amt);
len += amt;
}
*size = len;
return 0;
}
int
main(int argc, char *argv[])
{
char *kernel, *loader, *rdimage = NULL;
unsigned long ld_off, kern_off, rd_off;
unsigned long ld_size, kern_size, rd_size;
int fd, ofd, len;
char buffer[500];
if (argc < 5 && !strcmp(argv[argc-2], "-o"))
usage();
if (argc > 5)
rdimage = argv[3];
kernel = argv[2];
loader = argv[1];
ofd = open(argv[argc-1], (O_RDWR|O_CREAT), 0755);
if (ofd < 0) {
die("can't open %s: %s", argv[5], strerror(errno));
}
ld_off = kern_off = rd_off = 0;
ld_size = kern_size = rd_size = 0;
memset(buffer, 0, 500);
len = 0;
fd = open(loader, O_RDONLY);
if (fd < 0)
die("can't open loader: %s", strerror(errno));
copy_blocks(fd, ofd, &ld_off, &ld_size);
len = sprintf(buffer, "bootloader: %lx %lx\n", ld_off, ld_size);
close(fd);
fd = open(kernel, O_RDONLY);
if (fd < 0)
die("can't open kernel: %s", strerror(errno));
copy_blocks(fd, ofd, &kern_off, &kern_size);
len += sprintf(buffer+len, "zimage: %lx %lx\n", kern_off, kern_size);
close(fd);
if (rdimage) {
fd = open(rdimage, O_RDONLY);
if (fd < 0)
die("can't get ramdisk: %s", strerror(errno));
copy_blocks(fd, ofd, &rd_off, &rd_size);
close(fd);
}
len += sprintf(buffer+len, "initrd: %lx %lx", rd_off, rd_size);
close(ofd);
printf("%s\n", buffer);
return 0;
}
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