Mercurial > hg > toybox
diff toys/catv.c @ 35:f2c7f0799ebe
Add cat -v.
author | Rob Landley <rob@landley.net> |
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date | Sat, 25 Nov 2006 16:06:55 -0500 |
parents | |
children | bb4c38853a7d |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/toys/catv.c Sat Nov 25 16:06:55 2006 -0500 @@ -0,0 +1,60 @@ +/* vi: set sw=4 ts=4: */ +/* + * cat -v implementation for toybox + * + * Copyright (C) 2006 Rob Landley <rob@landley.net> + */ + +/* See "Cat -v considered harmful" at + * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */ + +#include "toys.h" + +int catv_main(void) +{ + int retval = 0, fd; + char **argv = toys.optargs; + + toys.optflags^=4; + + // Loop through files. + + do { + // Read from stdin if there's nothing else to do. + + fd = 0; + if (*argv && 0>(fd = xopen(*argv, O_RDONLY, 0))) retval = EXIT_FAILURE; + else for(;;) { + int i, res; + + res = reread(fd, toybuf, sizeof(toybuf)); + if (res < 0) retval = EXIT_FAILURE; + if (res < 1) break; + for (i=0; i<res; i++) { + char c=toybuf[i]; + + if (c > 126 && (toys.optflags & 4)) { + if (c == 127) { + printf("^?"); + continue; + } else { + printf("M-"); + c -= 128; + } + } + if (c < 32) { + if (c == 10) { + if (toys.optflags & 1) putchar('$'); + } else if (toys.optflags & (c==9 ? 2 : 4)) { + printf("^%c", c+'@'); + continue; + } + } + putchar(c); + } + } + if (CFG_TOYS_FREE && fd) close(fd); + } while (*++argv); + + return retval; +}