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#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include "arg.h"
char *argv0;
int execveat(int dirfd, const char *path,
char *const argv[],
char *const envp[],
int flags);
void die(const char *fmt, ...)
{
va_list ap;
int saved_errno;
saved_errno = errno;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
if (fmt[0] && fmt[strlen(fmt)-1] == ':')
fprintf(stderr, " %s", strerror(saved_errno));
fputc('\n', stderr);
exit(1);
}
#define usage() die("Usage: %s [filename]", argv0)
int main(int argc, char **argv)
{
ARGBEGIN {
default:
usage();
} ARGEND
if(argc < 1)
usage();
int cpwd = open(".", O_PATH | O_CLOEXEC);
int file = open(*argv, 0);
if(file < 0)
die("open file:");
char buf[1 << 8];
size_t linksize = readlink("/proc/self/exe", buf, 1 << 8);
if(linksize < 0)
die("readlink:");
buf[linksize] = '\0';
char *dname = dirname(buf);
chdir(dname);
int mkcpio = open("gen_init_cpio", O_CLOEXEC);
if(mkcpio < 0)
die("open gen_init_cpio:");
fchdir(cpwd);
char *argv0_dirname = strdup(*argv);
chdir(dirname(argv0_dirname));
free(argv0_dirname);
int cpiopipe[2];
if(pipe(cpiopipe) < 0)
die("pipe:");
int materialfd = memfd_create("material.mtl", 0);
if(materialfd < 0)
die("memfd_create:");
int stdout_kept = dup(STDOUT_FILENO);
dup2(cpiopipe[0], STDIN_FILENO);
dup2(cpiopipe[1], STDOUT_FILENO);
//dup2(STDOUT_FILENO, materialpipe[1]);
if(cpiopipe[0] != STDIN_FILENO)
close(cpiopipe[0]);
if(cpiopipe[1] != STDOUT_FILENO)
close(cpiopipe[1]);
/* all printf go to gen_init_cpio now */
printf("file material.mtl /proc/self/fd/%d 0644 0 0\n", materialfd);
size_t num_read = 1;
while(num_read > 0) {
buf[0] = '\0';
num_read = read(file, buf, (1 << 8) - 2);
lseek(file, -num_read, SEEK_CUR);
buf[num_read] = '\0';
*strchrnul(buf, '\n') = '\0';
lseek(file, strchrnul(buf, '\n') - buf + 1, SEEK_CUR);
if(strncmp(buf, "map_", 4) == 0 ||
strncmp(buf, "disp ", 5) == 0 ||
strncmp(buf, "bump ", 5) == 0) {
char *name = *argv;
#define CASE(val) strncmp(buf, val, strlen(val)) == 0
if(CASE("map_Ka "))
name = "ambient";
else if(CASE("map_Kd "))
name = "diffuse";
else if(CASE("map_Ks "))
name = "specular";
else if(CASE("map_Ns "))
name = "specular_highlight";
else if(CASE("map_bump ") || CASE("bump"))
name = "bump";
else if(CASE("disp "))
name = "displacement";
else if(CASE("map_d "))
name = "alpha";
*strchrnul(buf, ' ') = '\0';
dprintf(materialfd, "%s %s\n", buf, name);
printf("file %s %s 0644 0 0\n", name, strchrnul(buf, ' ') + 1);
} else {
dprintf(materialfd, "%s\n", buf);
}
}
fflush(stdout);
dup2(stdout_kept, STDOUT_FILENO);
if(stdout_kept != STDOUT_FILENO)
close(stdout_kept);
execveat(mkcpio, "", (char*[]){"gen_init_cpio", "-", NULL}, NULL, AT_EMPTY_PATH);
}
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