cvs commit: src/include Makefile printf.h src/lib/libc/stdio Makefile.inc vfprintf.c xprintf.c xprintf_float.c xprintf_hexdump.c xprintf_int.c xprintf_str.c xprintf_time.c xprintf_vis.c

[Poul-Henning Kamp]

phk         2005-12-16 18:56:39 UTC

  FreeBSD src repository

  Modified files:
    include              Makefile 
    lib/libc/stdio       Makefile.inc vfprintf.c 
  Added files:
    include              printf.h 
    lib/libc/stdio       xprintf.c xprintf_float.c 
                         xprintf_hexdump.c xprintf_int.c 
                         xprintf_str.c xprintf_time.c 
                         xprintf_vis.c 
  Log:
  Add an extensible version of our *printf(3) implementation to libc
  on probationary terms:  it may go away again if it transpires it is
  a bad idea.
  
  This extensible printf version will only be used if either
      environment variable USE_XPRINTF is defined
  or
      one of the extension functions are called.
  or
      the global variable __use_xprintf is set greater than zero.
  
  In all other cases our traditional printf implementation will
  be used.
  
  The extensible version is slower than the default printf, mostly
  because less opportunity for combining I/O operation exists when
  faced with extensions.  The default printf on the other hand
  is a bad case of spaghetti code.
  
  The extension API has a GLIBC compatible part and a FreeBSD version
  of same.  The FreeBSD version exists because the GLIBC version may
  run afoul of our FILE * locking in multithreaded programs and it
  even further eliminate the opportunities for combining I/O operations.
  
  Include three demo extensions which can be enabled if desired: time
  (%T), hexdump (%H) and strvis (%V).
  
  %T can format time_t (%T), struct timeval (%lT) and struct timespec (%llT)
     in one of two human readable duration formats:
          "%.3llT" -> "20349.245"
          "%#.3llT" -> "5h39m9.245"
  
  %H will hexdump a sequence of bytes and takes a pointer and a length
     argument.  The width specifies number of bytes per line.
          "%4H" -> "65 72 20 65"
          "%+4H" -> "0000 65 72 20 65"
          "%#4H" -> "65 72 20 65  |er e|"
          "%+#4H" -> "0000 65 72 20 65  |er e|"
  
  %V will dump a string in strvis format.
          "%V" -> "Hello\tWor\377ld"      (C-style)
          "%0V" -> "Hello\011Wor\377ld"   (octal)
          "%+V" -> "Hello%09Wor%FFld"     (http-style)
  
  Tests, comments, bugreports etc are most welcome.
  
  Revision  Changes    Path
  1.253     +1 -1      src/include/Makefile
  1.1       +155 -0    src/include/printf.h (new)
  1.34      +3 -0      src/lib/libc/stdio/Makefile.inc
  1.72      +7 -0      src/lib/libc/stdio/vfprintf.c
  1.1       +674 -0    src/lib/libc/stdio/xprintf.c (new)
  1.1       +425 -0    src/lib/libc/stdio/xprintf_float.c (new)
  1.1       +97 -0     src/lib/libc/stdio/xprintf_hexdump.c (new)
  1.1       +471 -0    src/lib/libc/stdio/xprintf_int.c (new)
  1.1       +187 -0    src/lib/libc/stdio/xprintf_str.c (new)
  1.1       +114 -0    src/lib/libc/stdio/xprintf_time.c (new)
  1.1       +76 -0     src/lib/libc/stdio/xprintf_vis.c (new)