diff options
Diffstat (limited to 'findcdrom')
| -rw-r--r-- | findcdrom/findcdrom.c | 127 |
1 files changed, 76 insertions, 51 deletions
diff --git a/findcdrom/findcdrom.c b/findcdrom/findcdrom.c index 3c99b34..d0c985e 100644 --- a/findcdrom/findcdrom.c +++ b/findcdrom/findcdrom.c @@ -13,61 +13,86 @@ // 3 : cdrom found but cannot creat /dev/cdrom // 4 : no cdrom data found +#define BUFF_SIZE 4096 +#define TMP_SIZE 4096 + +#define STR_SECT ".rodata" +#define STRING static const char __attribute__ ((__section__(STR_SECT),__aligned__(1))) + +STRING dev_str[] = "/dev"; +STRING cdrom_str[] = "cdrom"; +STRING info_str[] = "/proc/sys/dev/cdrom/info"; +STRING driver_name[] = "\ndrive name:"; +STRING found_str[] = "Found CDROM: "; +STRING nocdrom_str[] = "No CDROM found\n"; +STRING eol_str[] = "\n"; int main() { - int fd,fd2,s,t=0; - char tmp[4096],buff[4096],*p,*f; - static const char nocdrom[]="No CDROM found\n"; + int fd, fd2, s, t=0; + char *p, *f; + char tmp[TMP_SIZE], buff[BUFF_SIZE]; + + // find CDROM detection in /proc/sys/dev/cdrom/info + if ((fd = open(info_str, O_RDONLY)) < 0) { + write(2, nocdrom_str, sizeof(nocdrom_str) - 1); + exit(1); + } + if (chdir(dev_str)) { + PRINTF("Cannot chdir to /dev\n"); + exit(2); + } + // looking for "driver name:" + while ((s = read(fd, tmp + t, TMP_SIZE - t)) > 0) { + t += s; + if (t < TMP_SIZE) + tmp[t] = 0; + else + tmp[TMP_SIZE] = 0; - // find CDROM detection in /proc/sys/dev/cdrom/info - if ((fd=open("/proc/sys/dev/cdrom/info",O_RDONLY)) < 0) { - write(2,nocdrom,sizeof(nocdrom)); - exit(1); - } - if (chdir("/dev")) { - PRINTF("Cannot chdir to /dev\n"); - exit(2); - } - // looking for "driver name:" - while ((s=read(fd,tmp+t,4096-t)) > 0) { - t+=s; - if ((p=(char*)strstr(tmp,"\ndrive name:")) && strchr(p+=13,'\n')) { - // have found it, looking for drive name(s) - while (*p != '\n') { - while (*p == ' ' || *p == '\t') p++; - for (f=p;*f > ' ' ; f++) ; - if (*f == '\n') *f=0; else *f++=0; - // found and now try - PRINTF("Trying [%s]\n",p); - if ((fd2=open(p,O_RDONLY)) >= 0) { - // read a small packet to detect valid iso9660 - if (read(fd2,buff,4096) > 0) { - close(fd2); - close(fd); - // creat the symbolic link to /dev/cdrom - if (symlink(p,"cdrom") == 0) { + if ((p = (char*)strstr(tmp, driver_name)) && strchr(p += 13, '\n')) { + // have found it, looking for drive name(s) + while (*p && *p != '\n') { + while (*p == ' ' || *p == '\t') + p++; + + for (f = p; *f > ' ' ; f++); + + if (*f == '\n') + *f = 0; + else + *f++ = 0; + + // found and now try + PRINTF("Trying [%s]\n", p); + if ((fd2 = open(p, O_RDONLY)) >= 0) { + // read a small packet to detect valid iso9660 + if (read(fd2, buff, BUFF_SIZE) > 0) { + close(fd2); + close(fd); + // creat the symbolic link to /dev/cdrom + if (symlink(p, cdrom_str) == 0) { #ifdef DEBUG - write(2," ",2); + write(2, " ", 2); #endif - write(2,"Found CDROM: ",13); - write(2,p,strlen(p)); - write(2,"\n",1); - exit(0); - } - exit(3); - } - PRINTF(" read failed\n"); - close(fd2); - } else { - PRINTF(" open failed\n"); - } - p=f; - } - break; + write(2, found_str, sizeof(found_str) - 1); + write(2, p, strlen(p)); + write(2, eol_str, 1); + exit(0); + } + exit(3); + } + PRINTF(" read failed\n"); + close(fd2); + } else { + PRINTF(" open failed\n"); + } + p = f; + } + break; + } } - } - if (s >= 0) close(fd); - write(2,nocdrom,sizeof(nocdrom)); - return (4); + if (s >= 0) + close(fd); + write(2, nocdrom_str, sizeof(nocdrom_str) - 1); + return (4); } - |