2024-01-02 work
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ba1a1ed210
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108
Wip/dj/dj.c
108
Wip/dj/dj.c
@ -8,6 +8,42 @@
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STDIN_FILENO, STDOUT_FILENO */
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#define ARGV0 (argv[0] == NULL ? "<no argv[0]>" : argv[0])
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#define fdisnotstd(fd) \
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((fd) != STDIN_FILENO \
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&& (fd) != STDOUT_FILENO \
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&& (fd) != STDERR_FILENO)
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/* information that needs to be kept about each file in the "pipe" */
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struct Io{
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size_t index; /* index in io[] array */
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char *fn; /* file name (may be stdin_name or stdout_name) */
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int rec; /* records processed */
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int prec; /* partial records processed */
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int fd; /* file descriptor */
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int seek; /* bytes to seek/skip (will be 0 after skippage) */
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int bs; /* buffer size */
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size_t bufuse; /* buffer usage */
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char *buf; /* buffer */
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};
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static char stdin_name = "<stdin>";
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static char stdout_name = "<stdout>";
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static void
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Io_setdefaults(struct Io io[2]){
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io[0].bs = io[1].bs = 1024;
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io[0].buf = io[1].buf = NULL;
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io[0].fd = STDIN_FILENO;
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io[0].fn = stdin_name;
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io[1].fd = STDOUT_FILENO;
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io[1].fn = stdout_name;
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io[0].index = 0;
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io[1].index = 1;
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io[0].seek = io[1].seek = 0;
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return;
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}
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/* read(2) but with a second chance if it returns zero */
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static int
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@ -32,12 +68,15 @@ parse(char *s){
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: r;
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}
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/* s is the component (e.g. filename) that failed */
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static int
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oserr(char *argv0, char *s){
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fprintf(stderr, "%s: %s: %s\n", argv0, s, strerror(errno));
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return EX_OSERR;
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}
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/* diagnostic output
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* dd(1p) does %d+%d\n%d+%d\n */
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struct Io *
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output(struct Io io[2]){
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@ -50,7 +89,7 @@ static int
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terminate(struct Io io[2]){
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for(;; ++io){
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if(io->fd != STDIN_FILENO && io->fd != STDOUT_FILENO)
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if(fdisnotstd(io->fd))
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close(io->fd);
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free(io->buf);
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if(io->index == 1)
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@ -62,6 +101,7 @@ terminate(struct Io io[2]){
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static int
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usage(char *argv0){
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fprintf(stderr, "Usage: %s (-af) (-c [count]\n"
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"\t(-i [input file]) (-b [input block size])"
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" (-s [input offset])\n"
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@ -70,41 +110,20 @@ usage(char *argv0){
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return EX_USAGE;
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}
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static char stdin_name = "<stdin>";
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static char stdout_name = "<stdout>";
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int main(int argc, char *argv[]){
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struct Io{
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size_t index;
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char *fn;
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int rec;
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int prec;
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int fd;
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int seek;
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int bs;
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size_t bufuse;
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char *buf;
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} io[2]; /* { read, write } same as pipe(2) */
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char align;
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char noerror;
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int c;
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int count;
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size_t i;
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size_t p;
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char noerror;
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int p; /* pipe side */
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struct Io io[2]; /* { read, write } same as pipe(2) */
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/* defaults */
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align = 0;
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count = 0;
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noerror = 0;
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io[0].bs = io[1].bs = 1024;
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io[0].buf = io[1].buf = NULL;
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io[0].fd = STDIN_FILENO;
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io[0].fn = stdin_name;
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io[1].fd = STDOUT_FILENO;
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io[1].fn = stdout_name;
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io[0].index = 0;
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io[1].index = 1;
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io[0].seek = io[1].seek = 0;
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Io_setdefaults(io);
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if(argc > 0)
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while((c = getopt(argc, argv, "ac:i:b:fs:o:B:S:")) != -1)
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@ -112,14 +131,13 @@ int main(int argc, char *argv[]){
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int t;
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p = (c == 'o');
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if( (t = open(optarg,
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if( ((t = open(optarg,
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c == 'i'
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? O_RDONLY
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: O_WRONLY | O_CREAT))
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== -1)
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|| (io[p].fd != STDIN_FILENO
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&& io[p].fd != STDOUT_FILENO
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&& fclose(io[p].f) == EOF){
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|| (fdisnotstd(io[p].fd)
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&& close(io[p].fd) != 0)){
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terminate(io);
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return oserr(argv[0], optarg);
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}else{
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@ -152,9 +170,8 @@ int main(int argc, char *argv[]){
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terminate(io);
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return EX_OSERR;
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}else if(io[p].seek > 0){ /* seek */
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if(io[p].fd == STDIN_FILENO
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|| io[p].fd == STDOUT_FILENO
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|| lseek(io[p].fd, io[p].seek, SEEK_SET) == -1){
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if(!fdisnotstd(io[p].fd)
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|| lseek(io[p].fd, io[p].seek, SEEK_SET) == -1){
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if(p == 0){
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do if((io[p].bufuse = _read(io[p].fd, io[p].buf,
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io[p].bs < io[p].seek
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@ -185,16 +202,29 @@ int main(int argc, char *argv[]){
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io[0].prec = io[0].rec = io[1].prec = io[1].rec = 0;
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do{ if( (io[0].bufuse
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= fread(io[0].buf, sizeof io[0].buf, io[0].bs, io[0].f))
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< ibs){
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if(feof(io[0].f) != 0)
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do{ /* read */ if((io[0].bufuse
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= read(io[0].fd, io[0].buf, io[0].bs))
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< io[0].bs){
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if(io[0].bufuse == 0 && (!noerror
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|| ((io[0].bufuse = read(io[0].fd, io[0].buf, io[0].bs))
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== 0)))
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break; /* that's all she wrote */
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else{
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io[0].prec += 1;
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if(noerror){
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}else
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count = 1;
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if(align){
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memset(io[0].buf + io[0].bufuse, '\0',
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io[0].bs - io[0].bufuse);
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io[0].bufuse = io[0].bs;
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}
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}
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}
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while(io[0].bufuse > 0){
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/* write */ while(io[0].bufuse > 0){
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}
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}while(count == 0 || --count > 0);
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return terminate(output(io));
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