dj(1): refactor to build again and to get rid of globals
This commit is contained in:
parent
95f7992e0f
commit
45a880455d
GPG Key ID:
34C0543BBB6AF81B
81
src/dj.c
81
src/dj.c
@ -25,6 +25,8 @@
|
||||
#include <sysexits.h> /* EX_OK, EX_USAGE */
|
||||
#include <unistd.h> /* close(2), getopt(3), lseek(2), read(2), write(2),
|
||||
* optarg, optind, STDIN_FILENO, STDOUT_FILENO */
|
||||
#include <sys/stat.h> /* S_IRGRP, S_IROTH, S_IRUSR, S_IWGRP, S_IWOTH,
|
||||
S_IWUSR */
|
||||
extern int errno;
|
||||
|
||||
/* dj uses two structures that respectively correspond to the reading and
|
||||
@ -41,47 +43,17 @@ struct Io{
|
||||
int prec; /* partial records processed */
|
||||
int rec; /* records processed */
|
||||
long seek; /* bytes to seek/skip (will be 0 after skippage) (-sS) */
|
||||
} ep[2]; /* "engineered pipe"; also "extended play", for the deejay */
|
||||
};
|
||||
|
||||
/* Additionally, the following global variables are used to store user options.
|
||||
*/
|
||||
/* To be assigned to main:fmt_output and used with output(). */
|
||||
static char *fmt_asv = "%d\037%d\036%d\037%d\035%d\036%d\034";
|
||||
static char *fmt_human = "%d+%d > %d+%d; %d > %d\n";
|
||||
|
||||
/* (-a) */ static int align; /* Only the lower 8b are used but align is
|
||||
* negative if no alignment is being done. */
|
||||
|
||||
/* (-c) */ static int count; /* 0 if dj(1) runs until no more reads are
|
||||
* possible. */
|
||||
|
||||
/* ASCII field separator delimited statistics */
|
||||
static char *fmt_asv = "%d\037%d\036%d\037%d\035%d\036%d\034";
|
||||
/* human-readable statistics */
|
||||
static char *fmt_human = "%d+%d > %d+%d; %d > %d\n";
|
||||
/* pointer to chosen formatting */
|
||||
/* (-H) */ static char *fmt_output; /* fmt_asv (default) or fmt_human (-H) */
|
||||
|
||||
/* (-n) */ static char noerror; /* 0 - exits on partial reads or writes
|
||||
* (default)
|
||||
* 1 - retries on partial reads/writes
|
||||
* (-n) */
|
||||
|
||||
/* Non-configurable defaults. */
|
||||
#define bs_default 1024 /* GNU dd(1) default; twice POSIX but a neat 2^10 */
|
||||
static char *program_name = "<no argv[0]>";
|
||||
static char *stdin_name = "<stdin>";
|
||||
static char *stdout_name = "<stdout>";
|
||||
static int read_flags = O_RDONLY; /* These flags are consistent with Busybox */
|
||||
static int write_flags = O_WRONLY | O_CREAT; /* dd(1). */
|
||||
|
||||
/* Macro to set defaults for user-configurable options. */
|
||||
#define setdefaults do{ \
|
||||
align = -1; \
|
||||
count = 0; \
|
||||
fmt_output = fmt_asv; \
|
||||
noerror = 0; \
|
||||
ep[0].fl = read_flags; \
|
||||
Io_setdefaults(&ep[0]); \
|
||||
ep[1].fl = write_flags; \
|
||||
Io_setdefaults(&ep[1]); }while(0)
|
||||
static int read_flags = O_RDONLY; /* Consistent with Busybox dd(1). */
|
||||
static int write_flags = O_WRONLY | O_CREAT;
|
||||
|
||||
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
|
||||
|
||||
@ -238,7 +210,7 @@ Io_read(struct Io *io){
|
||||
static struct Io *
|
||||
Io_setdefaults(struct Io *io){
|
||||
|
||||
io->bs = bs_default;
|
||||
io->bs = 1024 /* bytes; 1 KiB */; /* GNU dd(1) default; POSIX says 512B */
|
||||
io->buf = NULL;
|
||||
io->bytes = 0;
|
||||
io->fd = (io->fl == read_flags) ? STDIN_FILENO : STDOUT_FILENO;
|
||||
@ -275,13 +247,13 @@ oserr(char *s){
|
||||
}
|
||||
|
||||
/* Prints statistics regarding the use of dj, particularly partially and
|
||||
* completely read and written records, accessing ep and fmt_output. */
|
||||
* completely read and written records. */
|
||||
static void
|
||||
output(void){
|
||||
output(struct Io io[2], char *fmt){
|
||||
|
||||
fprintf(stderr, fmt_output,
|
||||
ep[0].rec, ep[0].prec, ep[1].rec, ep[1].prec,
|
||||
ep[0].bytes, ep[1].bytes);
|
||||
fprintf(stderr, fmt,
|
||||
io[0].rec, io[0].prec, io[1].rec, io[1].prec,
|
||||
io[0].bytes, io[1].bytes);
|
||||
|
||||
return;
|
||||
}
|
||||
@ -312,14 +284,27 @@ usage(void){
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[]){
|
||||
int align; /* low 8b used, negative if no alignment is being done */
|
||||
int count; /* 0 if dj(1) runs until no more reads are possible */
|
||||
struct Io ep[2]; /* "engineered pipe"; also "extended play", for the DJ */
|
||||
char *fmt_output; /* fmt_asv (default) or fmt_human (-H) */
|
||||
char noerror; /* 0=exits (default) 1=retries on partial reads or writes */
|
||||
int c;
|
||||
int i;
|
||||
|
||||
setdefaults;
|
||||
/* Set defaults. */
|
||||
align = -1;
|
||||
count = 0;
|
||||
fmt_output = fmt_asv;
|
||||
noerror = 0;
|
||||
ep[0].fl = read_flags;
|
||||
Io_setdefaults(&ep[0]);
|
||||
ep[1].fl = write_flags;
|
||||
Io_setdefaults(&ep[1]);
|
||||
|
||||
if(argc > 0){
|
||||
program_name = argv[0];
|
||||
while((c = getopt(argc, argv, "a:Ab:B:c:di:hHnqs:S:o:")) != -1)
|
||||
while((c = getopt(argc, argv, "a:Ab:B:c:i:hHns:S:o:")) != -1)
|
||||
switch(c){
|
||||
case 'i': case 'o':
|
||||
i = (c == 'o');
|
||||
@ -369,7 +354,7 @@ int main(int argc, char *argv[]){
|
||||
}else if(ep[i].seek > 0)
|
||||
switch(Io_fdseek(&ep[i])){
|
||||
case EX_OK:
|
||||
output();
|
||||
output(ep, fmt_output);
|
||||
terminate(ep);
|
||||
return EX_OK;
|
||||
}
|
||||
@ -384,7 +369,7 @@ int main(int argc, char *argv[]){
|
||||
else if(ep[0].bufuse < ep[0].bs){
|
||||
++ep[0].prec;
|
||||
fprintf(stderr, "%s: Partial read:\n\t", program_name);
|
||||
output();
|
||||
output(ep, fmt_output);
|
||||
if(!noerror)
|
||||
count = 1;
|
||||
if(align >= 0)
|
||||
@ -410,7 +395,7 @@ int main(int argc, char *argv[]){
|
||||
}else if(c > ep[1].bufuse && ep[1].bufuse > 0){
|
||||
ep[1].prec += 1;
|
||||
fprintf(stderr, "%s: Partial write:\n\t", program_name);
|
||||
output();
|
||||
output(ep, fmt_output);
|
||||
if(!noerror)
|
||||
count = 1;
|
||||
}else if(ep[1].bufuse == 0 && c < ep[1].bs)
|
||||
@ -420,7 +405,7 @@ int main(int argc, char *argv[]){
|
||||
}while(ep[0].bufuse > 0);
|
||||
}while(count == 0 || --count > 0);
|
||||
|
||||
output();
|
||||
output(ep, fmt_output);
|
||||
terminate(ep);
|
||||
|
||||
return EX_OK;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user