69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/* cat.c - copy inputs to stdout.
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*
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* Copyright 2006 Rob Landley <rob@landley.net>
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*
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* See http://opengroup.org/onlinepubs/9699919799/utilities/cat.html
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USE_CAT(NEWTOY(cat, "uvte", TOYFLAG_BIN))
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config CAT
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bool "cat"
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default y
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help
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usage: cat [-etuv] [FILE...]
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Copy (concatenate) files to stdout. If no files listed, copy from stdin.
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Filename "-" is a synonym for stdin.
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-e Mark each newline with $
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-t Show tabs as ^I
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-u Copy one byte at a time (slow)
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-v Display nonprinting characters as escape sequences with M-x for
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high ascii characters (>127), and ^x for other nonprinting chars
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*/
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#define FOR_cat
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#define FORCE_FLAGS
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#include "toys.h"
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static void do_cat(int fd, char *name)
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{
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int i, len, size = FLAG(u) ? 1 : sizeof(toybuf);
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for(;;) {
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len = read(fd, toybuf, size);
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if (len<0) perror_msg_raw(name);
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if (len<1) break;
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if (toys.optflags&~FLAG_u) {
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for (i = 0; i<len; i++) {
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char c = toybuf[i];
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if (c>126 && FLAG(v)) {
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if (c>127) {
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printf("M-");
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c -= 128;
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}
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if (c == 127) {
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printf("^?");
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continue;
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}
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}
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if (c<32) {
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if (c == 10) {
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if (FLAG(e)) xputc('$');
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} else if (toys.optflags & (c==9 ? FLAG_t : FLAG_v)) {
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printf("^%c", c+'@');
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continue;
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}
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}
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xputc(c);
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}
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} else xwrite(1, toybuf, len);
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}
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}
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void cat_main(void)
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{
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loopfiles(toys.optargs, do_cat);
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}
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