Home | History | Annotate | Download | only in posix 
      1 /* cat.c - copy inputs to stdout.
      2  *
      3  * Copyright 2006 Rob Landley <rob (at) landley.net>
      4  *
      5  * See http://opengroup.org/onlinepubs/9699919799/utilities/cat.html
      6  *
      7  * And "Cat -v considered harmful" at
      8  *   http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz
      9 
     10 USE_CAT(NEWTOY(cat, "u"USE_CAT_V("vte"), TOYFLAG_BIN))
     11 USE_CATV(NEWTOY(catv, USE_CATV("vte"), TOYFLAG_USR|TOYFLAG_BIN))
     12 
     13 config CAT
     14   bool "cat"
     15   default y
     16   help
     17     usage: cat [-u] [file...]
     18 
     19     Copy (concatenate) files to stdout.  If no files listed, copy from stdin.
     20     Filename "-" is a synonym for stdin.
     21 
     22     -u	Copy one byte at a time (slow).
     23 
     24 config CAT_V
     25   bool "cat -etv"
     26   default n
     27   depends on CAT
     28   help
     29     usage: cat [-evt]
     30 
     31     -e	Mark each newline with $
     32     -t	Show tabs as ^I
     33     -v	Display nonprinting characters as escape sequences. Use M-x for
     34     	high ascii characters (>127), and ^x for other nonprinting chars.
     35 
     36 config CATV
     37   bool "catv"
     38   default y
     39   help
     40     usage: catv [-evt] [filename...]
     41 
     42     Display nonprinting characters as escape sequences. Use M-x for
     43     high ascii characters (>127), and ^x for other nonprinting chars.
     44 
     45     -e  Mark each newline with $
     46     -t  Show tabs as ^I
     47     -v  Don't use ^x or M-x escapes.
     48 */
     49 
     50 #define FOR_cat
     51 #define FORCE_FLAGS
     52 #include "toys.h"
     53 
     54 static void do_cat(int fd, char *name)
     55 {
     56   int i, len, size=(toys.optflags & FLAG_u) ? 1 : sizeof(toybuf);
     57 
     58   for(;;) {
     59     len = read(fd, toybuf, size);
     60     if (len < 0) toys.exitval = EXIT_FAILURE;
     61     if (len < 1) break;
     62     if ((CFG_CAT_V || CFG_CATV) && (toys.optflags&~FLAG_u)) {
     63       for (i=0; i<len; i++) {
     64         char c=toybuf[i];
     65 
     66         if (c > 126 && (toys.optflags & FLAG_v)) {
     67           if (c > 127) {
     68             printf("M-");
     69             c -= 128;
     70           }
     71           if (c == 127) {
     72             printf("^?");
     73             continue;
     74           }
     75         }
     76         if (c < 32) {
     77           if (c == 10) {
     78             if (toys.optflags & FLAG_e) xputc('$');
     79           } else if (toys.optflags & (c==9 ? FLAG_t : FLAG_v)) {
     80             printf("^%c", c+'@');
     81             continue;
     82           }
     83         }
     84         xputc(c);
     85       }
     86     } else xwrite(1, toybuf, len);
     87   }
     88 }
     89 
     90 void cat_main(void)
     91 {
     92   loopfiles(toys.optargs, do_cat);
     93 }
     94 
     95 void catv_main(void)
     96 {
     97   toys.optflags ^= FLAG_v;
     98   loopfiles(toys.optargs, do_cat);
     99 }
    100