Fix: dereference on NULL pointer on allocation failure

[lttng-tools.git] / m4 / pprint.m4

# Pretty printing macros.
#
# Author: Philippe Proulx <pproulx@efficios.com>

# PPRINT_INIT(): initializes the pretty printing system.
#
# Use this macro before using any other PPRINT_* macro.
AC_DEFUN([PPRINT_INIT], [
  m4_define([PPRINT_CONFIG_TS], [50])
  m4_define([PPRINT_CONFIG_INDENT], [2])
  PPRINT_YES_MSG=yes
  PPRINT_NO_MSG=no

  # find tput, which tells us if colors are supported and gives us color codes
  AC_PATH_PROG([pprint_tput], [tput])

  AS_IF([test -n "$pprint_tput"], [
    AS_IF([test -n "$PS1" && test `"$pprint_tput" colors` -ge 8 && test -t 1], [
      # interactive shell and colors supported and standard output
      # file descriptor is opened on a terminal
      PPRINT_COLOR_TXTBLK="`"$pprint_tput" setf 0`"
      PPRINT_COLOR_TXTBLU="`"$pprint_tput" setf 1`"
      PPRINT_COLOR_TXTGRN="`"$pprint_tput" setf 2`"
      PPRINT_COLOR_TXTCYN="`"$pprint_tput" setf 3`"
      PPRINT_COLOR_TXTRED="`"$pprint_tput" setf 4`"
      PPRINT_COLOR_TXTPUR="`"$pprint_tput" setf 5`"
      PPRINT_COLOR_TXTYLW="`"$pprint_tput" setf 6`"
      PPRINT_COLOR_TXTWHT="`"$pprint_tput" setf 7`"
      PPRINT_COLOR_BLD=`"$pprint_tput" bold`
      PPRINT_COLOR_BLDBLK="$PPRINT_COLOR_BLD$PPRINT_COLOR_TXTBLK"
      PPRINT_COLOR_BLDBLU="$PPRINT_COLOR_BLD$PPRINT_COLOR_TXTBLU"
      PPRINT_COLOR_BLDGRN="$PPRINT_COLOR_BLD$PPRINT_COLOR_TXTGRN"
      PPRINT_COLOR_BLDCYN="$PPRINT_COLOR_BLD$PPRINT_COLOR_TXTCYN"
      PPRINT_COLOR_BLDRED="$PPRINT_COLOR_BLD$PPRINT_COLOR_TXTRED"
      PPRINT_COLOR_BLDPUR="$PPRINT_COLOR_BLD$PPRINT_COLOR_TXTPUR"
      PPRINT_COLOR_BLDYLW="$PPRINT_COLOR_BLD$PPRINT_COLOR_TXTYLW"
      PPRINT_COLOR_BLDWHT="$PPRINT_COLOR_BLD$PPRINT_COLOR_TXTWHT"
      PPRINT_COLOR_RST="`"$pprint_tput" sgr0`"

      # colored yes and no
      PPRINT_YES_MSG="$PPRINT_COLOR_BLDGRN$PPRINT_YES_MSG$PPRINT_COLOR_RST"
      PPRINT_NO_MSG="$PPRINT_COLOR_BLDRED$PPRINT_NO_MSG$PPRINT_COLOR_RST"

      # subtitle color
      PPRINT_COLOR_SUBTITLE="$PPRINT_COLOR_BLDCYN"
    ])
  ])
])

# PPRINT_SET_INDENT(indent): sets the current indentation.
#
# Use PPRINT_INIT() before using this macro.
AC_DEFUN([PPRINT_SET_INDENT], [
  m4_define([PPRINT_CONFIG_INDENT], [$1])
])

# PPRINT_SET_TS(ts): sets the current tab stop.
#
# Use PPRINT_INIT() before using this macro.
AC_DEFUN([PPRINT_SET_TS], [
  m4_define([PPRINT_CONFIG_TS], [$1])
])

# PPRINT_SUBTITLE(subtitle): pretty prints a subtitle.
#
# The subtitle is put as is in a double-quoted shell string so the user
# needs to escape ".
#
# Use PPRINT_INIT() before using this macro.
AC_DEFUN([PPRINT_SUBTITLE], [
  AS_ECHO(["${PPRINT_COLOR_SUBTITLE}$1$PPRINT_COLOR_RST"])
])

AC_DEFUN([_PPRINT_INDENT], [
  m4_if(PPRINT_CONFIG_INDENT, 0, [
  ], [
    m4_for([pprint_i], [0], m4_eval(PPRINT_CONFIG_INDENT * 2 - 1), [1], [
      AS_ECHO_N([" "])
    ])
  ])
])

# PPRINT_PROP_STRING(title, value, title_color?): pretty prints a
# string property.
#
# The title is put as is in a double-quoted shell string so the user
# needs to escape ".
#
# The $PPRINT_CONFIG_INDENT variable must be set to the desired indentation
# level.
#
# Use PPRINT_INIT() before using this macro.
AC_DEFUN([PPRINT_PROP_STRING], [
  m4_pushdef([pprint_title], [$1])
  m4_pushdef([pprint_value], [$2])
  m4_pushdef([pprint_title_color], m4_default([$3], []))
  m4_pushdef([pprint_title_len], m4_len(pprint_title))
  m4_pushdef([pprint_spaces_cnt], m4_eval(PPRINT_CONFIG_TS - pprint_title_len - (PPRINT_CONFIG_INDENT * 2) - 1))

  m4_if(m4_eval(pprint_spaces_cnt <= 0), [1], [
    m4_define([pprint_spaces_cnt], [1])
  ])

  m4_pushdef([pprint_spaces], [])

  m4_for([pprint_i], 0, m4_eval(pprint_spaces_cnt - 1), [1], [
    m4_append([pprint_spaces], [ ])
  ])

  _PPRINT_INDENT

  AS_ECHO_N(["pprint_title_color""pprint_title$PPRINT_COLOR_RST:pprint_spaces"])
  AS_ECHO(["${PPRINT_COLOR_BLD}pprint_value$PPRINT_COLOR_RST"])

  m4_popdef([pprint_spaces])
  m4_popdef([pprint_spaces_cnt])
  m4_popdef([pprint_title_len])
  m4_popdef([pprint_title_color])
  m4_popdef([pprint_value])
  m4_popdef([pprint_title])
])

# PPRINT_PROP_BOOL(title, value, title_color?): pretty prints a boolean
# property.
#
# The title is put as is in a double-quoted shell string so the user
# needs to escape ".
#
# The value is evaluated at shell runtime. Its evaluation must be
# 0 (false) or 1 (true).
#
# Uses the PPRINT_PROP_STRING() with the "yes" or "no" string.
#
# Use PPRINT_INIT() before using this macro.
AC_DEFUN([PPRINT_PROP_BOOL], [
  m4_pushdef([pprint_title], [$1])
  m4_pushdef([pprint_value], [$2])

  test pprint_value -eq 0 && pprint_msg="$PPRINT_NO_MSG" || pprint_msg="$PPRINT_YES_MSG"

  m4_if([$#], [3], [
    PPRINT_PROP_STRING(pprint_title, [$pprint_msg], $3)
  ], [
    PPRINT_PROP_STRING(pprint_title, [$pprint_msg])
  ])

  m4_popdef([pprint_value])
  m4_popdef([pprint_title])
])

# PPRINT_WARN(msg): pretty prints a warning message.
#
# The message is put as is in a double-quoted shell string so the user
# needs to escape ".
#
# Use PPRINT_INIT() before using this macro.
AC_DEFUN([PPRINT_WARN], [
  m4_pushdef([pprint_msg], [$1])

  _PPRINT_INDENT
  AS_ECHO(["${PPRINT_COLOR_TXTYLW}WARNING:$PPRINT_COLOR_RST ${PPRINT_COLOR_BLDYLW}pprint_msg$PPRINT_COLOR_RST"])

  m4_popdef([pprint_msg])
])

# PPRINT_ERROR(msg): pretty prints an error message and exits.
#
# The message is put as is in a double-quoted shell string so the user
# needs to escape ".
#
# Use PPRINT_INIT() before using this macro.
AC_DEFUN([PPRINT_ERROR], [
  m4_pushdef([pprint_msg], [$1])

  AC_MSG_ERROR([${PPRINT_COLOR_BLDRED}pprint_msg$PPRINT_COLOR_RST])

  m4_popdef([pprint_msg])
])