debug mode, new option parsing, also i broke it
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3bc4e01b35
commit
71612d7308
89
dj/dj.c
89
dj/dj.c
@ -1,3 +1,4 @@
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#include <ctype.h> /* isupper(3), tolower(3) */
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#include <errno.h> /* errno */
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#include <fcntl.h> /* open(2) */
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#include <stdio.h> /* fprintf(3), stderr */
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@ -149,26 +150,32 @@ Io_read(struct Io *io){
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/* Seeks io->seek bytes through *io's file descriptor, (counter-intuitively)
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* returning -1 if successful and a sysexits.h exit code if an unrecoverable
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* error occurred. */
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* error occurred. io->buf will be cleared of useful bytes and io->seek will
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* be set to zero to indicate the seek occurred. */
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static int
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Io_seek(struct Io *io){
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ssize_t (*op)(int, void *, size_t);
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Io_fdseek(struct Io *io){
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int (*op)(int, void *, size_t);
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if(!fdisstd(io->fd) && lseek(io->fd, io->seek, SEEK_SET) != -1)
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return -1;
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else if(io->fl == write_flags){
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/* cheat and use bufuse as the retval for write */
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memset(io->buf, '\0', io->bs);
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/* This is a dirty trick; rather than testing conditions and operating
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* likewise, because the parameters to read or write are going to be
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* the same either way, just use a function pointer to keep track of
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* the intended operation. */
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op = &write; /* Ignore -Wincompatible-pointer-types, it's fine. */
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/* The difference is between const void * and void * which isn't
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* significant enough to affect program behavior. */
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op = (int (*)(int, void *, size_t))&write;
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/* Function pointer casts are risky; this works because the difference
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* is in the second parameter and only that write(2) makes the buffer
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* const whereas read(2) does not. To avoid even the slightest
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* undefined behavior comment out the cast, just be ready for a
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* -Wincompatible-function-pointer-types if your compiler notices it.
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*/
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}else
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op = &read;
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/* We're going to cheat and use bufuse as the retval for write(2), which is
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* fine because it'll be zeroed as this function returns anyway. */
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do{ if( (io->bufuse = (*op)(io->fd, io->buf, MIN(io->bs, io->seek))) == 0)
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/* second chance */
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io->bufuse = (*op)(io->fd, io->buf, MIN(io->bs, io->seek));
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@ -250,7 +257,7 @@ parse(char *s){
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static int
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usage(char *argv0){
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fprintf(stderr, "Usage: %s (-dfAH) (-a [byte]) (-c [count])\n"
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fprintf(stderr, "Usage: %s (-AdfHqQ) (-a [byte]) (-c [count])\n"
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"\t(-i [input file]) (-b [input block size]) (-s [input offset])\n"
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"\t(-o [output file]) (-B [output block size]) (-S [output offset])\n",
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ARGV0(argv0));
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@ -259,7 +266,7 @@ usage(char *argv0){
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}
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int main(int argc, char *argv[]){
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char align;
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int align;
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char debug;
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char noerror;
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int c;
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@ -279,36 +286,46 @@ int main(int argc, char *argv[]){
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Io_setdefaults(&io[1]);
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if(argc > 0)
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while((c = getopt(argc, argv, "a:Ab:B:c:i:fHqQs:S:o:")) != -1)
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if(c == 'i' || c == 'o'){
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if(Io_fdopen(&io[c == 'o'], optarg) == -1){
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terminate(io);
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return oserr(argv[0], optarg);
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while((c = getopt(argc, argv, "a:Ab:B:c:di:fhHqQs:S:o:")) != -1)
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switch(c){
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case 'i': case 'o':
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if(Io_fdopen(&io[c == 'o'], optarg) != -1)
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break;
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terminate(io);
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return oserr(argv[0], optarg);
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case 'A': align = '\0'; break;
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case 'd': debug = 3; break;
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case 'f': noerror = 1; break;
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case 'H': fmt_output = fmt_human; break;
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case 'q': /* be quiet / BE QUIET */
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case 'Q': debug -= 1 + (c == 'Q'); break;
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case 'a':
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if(optarg[0] != '\0' && optarg[1] == '\0'){
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align = optarg[0];
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break;
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}
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/* boolean/flag arguments */
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}else if(c == 'A')
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align = '\0';
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else if(c == 'f')
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noerror = 1;
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else if(c == 'H')
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fmt_output = fmt_human;
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else if(c == 'q')
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debug = 1;
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else if(c == 'Q')
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debug = 0;
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/* optarg */
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else if(c == 'a' && optarg[0] != '\0' && optarg[1] == '\0')
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align = optarg[0];
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/* numeric args */
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else if(!((c == 'c' && (count = parse(optarg)) >= 0)
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|| (c == 'b' && (io[0].bs = parse(optarg)) >= 0)
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|| (c == 's' && (io[0].seek = parse(optarg)) >= 0)
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|| (c == 'B' && (io[1].bs = parse(optarg)) >= 0)
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|| (c == 'S' && (io[1].seek = parse(optarg)) >= 0))){
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case 'c': case 'b': case 's': case 'B': case 'S':
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if(c == 'c' && (count = parse(optarg)) >= 0)
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break;
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p = isupper(c);
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c = tolower(c);
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if((c == 'b' && (io[p].bs = parse(optarg)) > 0)
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|| (c == 's' && (io[p].seek = parse(optarg)) >= 0))
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break;
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default:
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terminate(io);
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return usage(argv[0]);
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}
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if(debug >= 3)
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fprintf(stderr,
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"argv0=%s\n"
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"in=%s\tibs=%d\tskip=%ld\talign=%hhx\tcount=%d\n"
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"out=%s\tobs=%d\tseek=%ld\tdebug=%2d\tnoerror=%d\n",
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ARGV0(argv[0]),
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io[0].fn, io[0].bs, io[0].seek, align, count,
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io[1].fn, io[1].bs, io[1].seek, debug, noerror);
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if(argc > optind){
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terminate(io);
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return usage(argv[0]);
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@ -320,8 +337,8 @@ int main(int argc, char *argv[]){
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ARGV0(argv[0]), io[p].bs);
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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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switch(Io_seek(&io[p])){
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}else if(io[p].seek > 0)
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switch(Io_fdseek(&io[p])){
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case EX_OK:
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if(debug >= 1)
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output(io);
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