LXR toybox/toys/posix/cat.c

   1/* cat.c - copy inputs to stdout.
   2 *
   3 * Copyright 2006 Rob Landley <rob@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
  10USE_CAT(NEWTOY(cat, "u"USE_CAT_V("vte"), TOYFLAG_BIN))
  11USE_CATV(NEWTOY(catv, USE_CATV("vte"), TOYFLAG_USR|TOYFLAG_BIN))
  12
  13config 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
  24config 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 with M-x for
  34        high ascii characters (>127), and ^x for other nonprinting chars
  35
  36config 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
  54static 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) {
  61      toys.exitval = EXIT_FAILURE;
  62      perror_msg_raw(name);
  63    }
  64    if (len < 1) break;
  65    if ((CFG_CAT_V || CFG_CATV) && (toys.optflags&~FLAG_u)) {
  66      for (i=0; i<len; i++) {
  67        char c=toybuf[i];
  68
  69        if (c > 126 && (toys.optflags & FLAG_v)) {
  70          if (c > 127) {
  71            printf("M-");
  72            c -= 128;
  73          }
  74          if (c == 127) {
  75            printf("^?");
  76            continue;
  77          }
  78        }
  79        if (c < 32) {
  80          if (c == 10) {
  81            if (toys.optflags & FLAG_e) xputc('$');
  82          } else if (toys.optflags & (c==9 ? FLAG_t : FLAG_v)) {
  83            printf("^%c", c+'@');
  84            continue;
  85          }
  86        }
  87        xputc(c);
  88      }
  89    } else xwrite(1, toybuf, len);
  90  }
  91}
  92
  93void cat_main(void)
  94{
  95  loopfiles(toys.optargs, do_cat);
  96}
  97
  98void catv_main(void)
  99{
 100  toys.optflags ^= FLAG_v;
 101  loopfiles(toys.optargs, do_cat);
 102}
 103