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-rw-r--r--toys/posix/cat.c85
1 files changed, 79 insertions, 6 deletions
diff --git a/toys/posix/cat.c b/toys/posix/cat.c
index 3644c4f9..5b4ab71a 100644
--- a/toys/posix/cat.c
+++ b/toys/posix/cat.c
@@ -3,8 +3,12 @@
* Copyright 2006 Rob Landley <rob@landley.net>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/cat.html
+ *
+ * And "Cat -v considered harmful" at
+ * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz
-USE_CAT(NEWTOY(cat, "u", TOYFLAG_BIN))
+USE_CAT(NEWTOY(cat, "u"USE_CAT_V("vte"), TOYFLAG_BIN))
+#USE_CATV(NEWTOY(catv, USE_CATV("vte"), TOYFLAG_USR|TOYFLAG_BIN))
config CAT
bool "cat"
@@ -16,19 +20,76 @@ config CAT
Filename "-" is a synonym for stdin.
-u Copy one byte at a time (slow).
+
+config CAT_V
+ bool "cat -etv"
+ default y
+ depends on CAT
+ help
+ usage: cat [-evt]
+
+ Display nonprinting characters as escape sequences. Use M-x for
+
+ -e Mark each newline with $
+ -t Show tabs as ^I
+ -v Display nonprinting characters as escape sequences. Use M-x for
+ high ascii characters (>127), and ^x for other nonprinting chars.
+*/
+
+/*
+todo:
+
+config CATV
+ bool "catv"
+ default y
+ depends on !CAT_V
+ help
+ usage: catv [-evt] [filename...]
+
+ Display nonprinting characters as escape sequences. Use M-x for
+ high ascii characters (>127), and ^x for other nonprinting chars.
+
+ -e Mark each newline with $
+ -t Show tabs as ^I
+ -v Don't use ^x or M-x escapes.
*/
+#define FOR_cat
#include "toys.h"
static void do_cat(int fd, char *name)
{
- int len, size=toys.optflags ? 1 : sizeof(toybuf);
+ int i, len, size=(toys.optflags & FLAG_u) ? 1 : sizeof(toybuf);
- for (;;) {
+ for(;;) {
len = read(fd, toybuf, size);
- if (len<0) perror_msg("%s",name);
- if (len<1) break;
- xwrite(1, toybuf, len);
+ if (len < 0) toys.exitval = EXIT_FAILURE;
+ if (len < 1) break;
+ if (CFG_CAT_V && (toys.optflags&~FLAG_u)) {
+ for (i=0; i<len; i++) {
+ char c=toybuf[i];
+
+ if (c > 126 && (toys.optflags & FLAG_v)) {
+ if (c > 127) {
+ printf("M-");
+ c -= 128;
+ }
+ if (c == 127) {
+ printf("^?");
+ continue;
+ }
+ }
+ if (c < 32) {
+ if (c == 10) {
+ if (toys.optflags & FLAG_e) xputc('$');
+ } else if (toys.optflags & (c==9 ? FLAG_t : FLAG_v)) {
+ printf("^%c", c+'@');
+ continue;
+ }
+ }
+ xputc(c);
+ }
+ } else xwrite(1, toybuf, len);
}
}
@@ -36,3 +97,15 @@ void cat_main(void)
{
loopfiles(toys.optargs, do_cat);
}
+
+//todo:
+//void catv_main(void)
+//{
+// toys.optflags ^= FLAG_v;
+// loopfiles(toys.optargs, do_catv);
+//}
+
+// The common infrastructure is testing FLAG_h which is only defined in cat
+// context (not catv), but catv can't use cat's flag context if cat is disabled
+// and its flags are zero. Need to upgrade flag parsing infrastructure so
+// defining FORCE_FLAGS along with FOR_command doesn't zero unused flag macros.